Merge branch 'master' into great_line_ending_and_cursor_range_cleanup

28 files changed, 383 insertions, 456 deletions

diff --git a/helix-core/src/auto_pairs.rs b/helix-core/src/auto_pairs.rs
index 746f201a..d9569acd 100644
--- a/helix-core/src/auto_pairs.rs
+++ b/helix-core/src/auto_pairs.rs
@@ -139,7 +139,7 @@ fn handle_close(doc: &Rope, selection: &Selection, _open: char, close: char) ->
 }
 
 // handle cases where open and close is the same, or in triples ("""docstring""")
-fn handle_same(doc: &Rope, selection: &Selection, token: char) -> Option<Transaction> {
+fn handle_same(_doc: &Rope, _selection: &Selection, _token: char) -> Option<Transaction> {
     // if not cursor but selection, wrap
     // let next = next char
 
diff --git a/helix-core/src/history.rs b/helix-core/src/history.rs
index 23680275..67ded166 100644
--- a/helix-core/src/history.rs
+++ b/helix-core/src/history.rs
@@ -1,7 +1,6 @@
 use crate::{ChangeSet, Rope, State, Transaction};
 use once_cell::sync::Lazy;
 use regex::Regex;
-use smallvec::{smallvec, SmallVec};
 use std::num::NonZeroUsize;
 use std::time::{Duration, Instant};
 
@@ -127,7 +126,6 @@ impl History {
         let last_child = current_revision.last_child?;
         self.current = last_child.get();
 
-        let last_child_revision = &self.revisions[last_child.get()];
         Some(&self.revisions[last_child.get()].transaction)
     }
 
@@ -377,21 +375,21 @@ mod test {
             if let Some(transaction) = history.undo() {
                 transaction.apply(&mut state.doc);
             }
-        };
+        }
 
         fn earlier(history: &mut History, state: &mut State, uk: UndoKind) {
             let txns = history.earlier(uk);
             for txn in txns {
                 txn.apply(&mut state.doc);
             }
-        };
+        }
 
         fn later(history: &mut History, state: &mut State, uk: UndoKind) {
             let txns = history.later(uk);
             for txn in txns {
                 txn.apply(&mut state.doc);
             }
-        };
+        }
 
         fn commit_change(
             history: &mut History,
@@ -402,7 +400,7 @@ mod test {
             let txn = Transaction::change(&state.doc, vec![change.clone()].into_iter());
             history.commit_revision_at_timestamp(&txn, &state, instant);
             txn.apply(&mut state.doc);
-        };
+        }
 
         let t0 = Instant::now();
         let t = |n| t0.checked_add(Duration::from_secs(n)).unwrap();
diff --git a/helix-core/src/indent.rs b/helix-core/src/indent.rs
index 8e0379e2..81bdffc0 100644
--- a/helix-core/src/indent.rs
+++ b/helix-core/src/indent.rs
@@ -1,13 +1,13 @@
 use crate::{
     find_first_non_whitespace_char,
     syntax::{IndentQuery, LanguageConfiguration, Syntax},
-    tree_sitter::{Node, Tree},
-    Rope, RopeSlice,
+    tree_sitter::Node,
+    RopeSlice,
 };
 
 /// To determine indentation of a newly inserted line, figure out the indentation at the last col
 /// of the previous line.
-
+#[allow(dead_code)]
 fn indent_level_for_line(line: RopeSlice, tab_width: usize) -> usize {
     let mut len = 0;
     for ch in line.chars() {
@@ -98,12 +98,13 @@ fn calculate_indentation(query: &IndentQuery, node: Option<Node>, newline: bool)
     increment as usize
 }
 
+#[allow(dead_code)]
 fn suggested_indent_for_line(
     language_config: &LanguageConfiguration,
     syntax: Option<&Syntax>,
     text: RopeSlice,
     line_num: usize,
-    tab_width: usize,
+    _tab_width: usize,
 ) -> usize {
     if let Some(start) = find_first_non_whitespace_char(text.line(line_num)) {
         return suggested_indent_for_pos(
@@ -150,6 +151,7 @@ pub fn suggested_indent_for_pos(
 #[cfg(test)]
 mod test {
     use super::*;
+    use crate::Rope;
 
     #[test]
     fn test_indent_level() {
diff --git a/helix-core/src/lib.rs b/helix-core/src/lib.rs
index ae135b00..dfbbd748 100644
--- a/helix-core/src/lib.rs
+++ b/helix-core/src/lib.rs
@@ -1,4 +1,3 @@
-#![allow(unused)]
 pub mod auto_pairs;
 pub mod chars;
 pub mod comment;
diff --git a/helix-core/src/line_ending.rs b/helix-core/src/line_ending.rs
index 7ea3f14a..e3ff6478 100644
--- a/helix-core/src/line_ending.rs
+++ b/helix-core/src/line_ending.rs
@@ -1,4 +1,4 @@
-use crate::{Rope, RopeGraphemes, RopeSlice};
+use crate::{Rope, RopeSlice};
 
 #[cfg(target_os = "windows")]
 pub const DEFAULT_LINE_ENDING: LineEnding = LineEnding::Crlf;
diff --git a/helix-core/src/match_brackets.rs b/helix-core/src/match_brackets.rs
index 288b4586..2aa87620 100644
--- a/helix-core/src/match_brackets.rs
+++ b/helix-core/src/match_brackets.rs
@@ -1,4 +1,4 @@
-use crate::{Range, Rope, Selection, Syntax};
+use crate::{Rope, Syntax};
 
 const PAIRS: &[(char, char)] = &[('(', ')'), ('{', '}'), ('[', ']'), ('<', '>')];
 // limit matching pairs to only ( ) { } [ ] < >
@@ -12,7 +12,7 @@ pub fn find(syntax: &Syntax, doc: &Rope, pos: usize) -> Option<usize> {
     // most naive implementation: find the innermost syntax node, if we're at the edge of a node,
     // return the other edge.
 
-    let mut node = match tree
+    let node = match tree
         .root_node()
         .named_descendant_for_byte_range(byte_pos, byte_pos)
     {
diff --git a/helix-core/src/movement.rs b/helix-core/src/movement.rs
index a4c7f9c9..acc95e7e 100644
--- a/helix-core/src/movement.rs
+++ b/helix-core/src/movement.rs
@@ -1,12 +1,9 @@
-use std::iter::{self, from_fn, Peekable, SkipWhile};
+use std::iter::{self, from_fn};
 
 use ropey::iter::Chars;
 
 use crate::{
-    chars::{
-        categorize_char, char_is_line_ending, char_is_punctuation, char_is_whitespace,
-        char_is_word, CharCategory,
-    },
+    chars::{categorize_char, char_is_line_ending, CharCategory},
     coords_at_pos,
     graphemes::{nth_next_grapheme_boundary, nth_prev_grapheme_boundary},
     line_ending::{get_line_ending, line_end_char_index},
@@ -116,7 +113,7 @@ pub fn move_prev_long_word_start(slice: RopeSlice, range: Range, count: usize) -
     word_move(slice, range, count, WordMotionTarget::PrevLongWordStart)
 }
 
-fn word_move(slice: RopeSlice, mut range: Range, count: usize, target: WordMotionTarget) -> Range {
+fn word_move(slice: RopeSlice, range: Range, count: usize, target: WordMotionTarget) -> Range {
     (0..count).fold(range, |range, _| {
         slice.chars_at(range.head).range_to_target(target, range)
     })
@@ -182,7 +179,6 @@ enum WordMotionPhase {
 
 impl CharHelpers for Chars<'_> {
     fn range_to_target(&mut self, target: WordMotionTarget, origin: Range) -> Range {
-        let range = origin;
         // Characters are iterated forward or backwards depending on the motion direction.
         let characters: Box<dyn Iterator<Item = char>> = match target {
             WordMotionTarget::PrevWordStart | WordMotionTarget::PrevLongWordStart => {
@@ -270,20 +266,20 @@ fn reached_target(target: WordMotionTarget, peek: char, next_peek: Option<&char>
 
     match target {
         WordMotionTarget::NextWordStart => {
-            (is_word_boundary(peek, *next_peek)
-                && (char_is_line_ending(*next_peek) || !next_peek.is_whitespace()))
+            is_word_boundary(peek, *next_peek)
+                && (char_is_line_ending(*next_peek) || !next_peek.is_whitespace())
         }
         WordMotionTarget::NextWordEnd | WordMotionTarget::PrevWordStart => {
-            (is_word_boundary(peek, *next_peek)
-                && (!peek.is_whitespace() || char_is_line_ending(*next_peek)))
+            is_word_boundary(peek, *next_peek)
+                && (!peek.is_whitespace() || char_is_line_ending(*next_peek))
         }
         WordMotionTarget::NextLongWordStart => {
-            (is_long_word_boundary(peek, *next_peek)
-                && (char_is_line_ending(*next_peek) || !next_peek.is_whitespace()))
+            is_long_word_boundary(peek, *next_peek)
+                && (char_is_line_ending(*next_peek) || !next_peek.is_whitespace())
         }
         WordMotionTarget::NextLongWordEnd | WordMotionTarget::PrevLongWordStart => {
-            (is_long_word_boundary(peek, *next_peek)
-                && (!peek.is_whitespace() || char_is_line_ending(*next_peek)))
+            is_long_word_boundary(peek, *next_peek)
+                && (!peek.is_whitespace() || char_is_line_ending(*next_peek))
         }
     }
 }
diff --git a/helix-core/src/object.rs b/helix-core/src/object.rs
index 950b7592..d9558dd8 100644
--- a/helix-core/src/object.rs
+++ b/helix-core/src/object.rs
@@ -1,5 +1,4 @@
 use crate::{Range, RopeSlice, Selection, Syntax};
-use smallvec::smallvec;
 
 // TODO: to contract_selection we'd need to store the previous ranges before expand.
 // Maybe just contract to the first child node?
diff --git a/helix-core/src/position.rs b/helix-core/src/position.rs
index 392eee9c..3d114b52 100644
--- a/helix-core/src/position.rs
+++ b/helix-core/src/position.rs
@@ -1,7 +1,7 @@
 use crate::{
     chars::char_is_line_ending,
     graphemes::{nth_next_grapheme_boundary, RopeGraphemes},
-    Rope, RopeSlice,
+    RopeSlice,
 };
 
 /// Represents a single point in a text buffer. Zero indexed.
@@ -70,6 +70,7 @@ pub fn pos_at_coords(text: RopeSlice, coords: Position) -> usize {
 #[cfg(test)]
 mod test {
     use super::*;
+    use crate::Rope;
 
     #[test]
     fn test_ordering() {
@@ -79,8 +80,8 @@ mod test {
 
     #[test]
     fn test_coords_at_pos() {
-        let text = Rope::from("ḧëḷḷö\nẅöṛḷḋ");
-        let slice = text.slice(..);
+        // let text = Rope::from("ḧëḷḷö\nẅöṛḷḋ");
+        // let slice = text.slice(..);
         // assert_eq!(coords_at_pos(slice, 0), (0, 0).into());
         // assert_eq!(coords_at_pos(slice, 5), (0, 5).into()); // position on \n
         // assert_eq!(coords_at_pos(slice, 6), (1, 0).into()); // position on w
diff --git a/helix-core/src/selection.rs b/helix-core/src/selection.rs
index e9dea518..5f77d7ad 100644
--- a/helix-core/src/selection.rs
+++ b/helix-core/src/selection.rs
@@ -6,7 +6,7 @@ use crate::{
     graphemes::{
         ensure_grapheme_boundary_next, ensure_grapheme_boundary_prev, next_grapheme_boundary,
     },
-    Assoc, ChangeSet, Rope, RopeSlice,
+    Assoc, ChangeSet, RopeSlice,
 };
 use smallvec::{smallvec, SmallVec};
 use std::borrow::Cow;
@@ -426,10 +426,8 @@ pub fn select_on_matches(
         // TODO: can't avoid occasional allocations since Regex can't operate on chunks yet
         let fragment = sel.fragment(text);
 
-        let mut sel_start = sel.from();
-        let sel_end = sel.to();
-
-        let mut start_byte = text.char_to_byte(sel_start);
+        let sel_start = sel.from();
+        let start_byte = text.char_to_byte(sel_start);
 
         for mat in regex.find_iter(&fragment) {
             // TODO: retain range direction
@@ -466,10 +464,10 @@ pub fn split_on_matches(
         // TODO: can't avoid occasional allocations since Regex can't operate on chunks yet
         let fragment = sel.fragment(text);
 
-        let mut sel_start = sel.from();
+        let sel_start = sel.from();
         let sel_end = sel.to();
 
-        let mut start_byte = text.char_to_byte(sel_start);
+        let start_byte = text.char_to_byte(sel_start);
 
         let mut start = sel_start;
 
@@ -492,11 +490,12 @@ pub fn split_on_matches(
 #[cfg(test)]
 mod test {
     use super::*;
+    use crate::Rope;
 
     #[test]
     #[should_panic]
     fn test_new_empty() {
-        let sel = Selection::new(smallvec![], 0);
+        let _ = Selection::new(smallvec![], 0);
     }
 
     #[test]
diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index c556a347..9dbb2c03 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -1,4 +1,10 @@
-use crate::{chars::char_is_line_ending, regex::Regex, Change, Rope, RopeSlice, Transaction};
+use crate::{
+    chars::char_is_line_ending,
+    regex::Regex,
+    transaction::{ChangeSet, Operation},
+    Rope, RopeSlice, Tendril,
+};
+
 pub use helix_syntax::{get_language, get_language_name, Lang};
 
 use arc_swap::ArcSwap;
@@ -8,7 +14,7 @@ use std::{
     cell::RefCell,
     collections::{HashMap, HashSet},
     fmt,
-    path::{Path, PathBuf},
+    path::Path,
     sync::Arc,
 };
 
@@ -160,7 +166,7 @@ impl LanguageConfiguration {
             None
         } else {
             let language = get_language(self.language_id);
-            let mut config = HighlightConfiguration::new(
+            let config = HighlightConfiguration::new(
                 language,
                 &highlights_query,
                 &injections_query,
@@ -326,7 +332,8 @@ impl Syntax {
 
         // update root layer
         PARSER.with(|ts_parser| {
-            syntax.root_layer.parse(
+            // TODO: handle the returned `Result` properly.
+            let _ = syntax.root_layer.parse(
                 &mut ts_parser.borrow_mut(),
                 &syntax.config,
                 source,
@@ -381,7 +388,7 @@ impl Syntax {
         source: RopeSlice<'a>,
         range: Option<std::ops::Range<usize>>,
         cancellation_flag: Option<&'a AtomicUsize>,
-        mut injection_callback: impl FnMut(&str) -> Option<&'a HighlightConfiguration> + 'a,
+        injection_callback: impl FnMut(&str) -> Option<&'a HighlightConfiguration> + 'a,
     ) -> impl Iterator<Item = Result<HighlightEvent, Error>> + 'a {
         // The `captures` iterator borrows the `Tree` and the `QueryCursor`, which
         // prevents them from being moved. But both of these values are really just
@@ -473,12 +480,6 @@ pub struct LanguageLayer {
     pub(crate) tree: Option<Tree>,
 }
 
-use crate::{
-    coords_at_pos,
-    transaction::{ChangeSet, Operation},
-    Tendril,
-};
-
 impl LanguageLayer {
     // pub fn new() -> Self {
     //     Self { tree: None }
@@ -494,8 +495,8 @@ impl LanguageLayer {
         ts_parser: &mut TsParser,
         config: &HighlightConfiguration,
         source: &Rope,
-        mut depth: usize,
-        mut ranges: Vec<Range>,
+        _depth: usize,
+        ranges: Vec<Range>,
     ) -> Result<(), Error> {
         if ts_parser.parser.set_included_ranges(&ranges).is_ok() {
             ts_parser
@@ -566,7 +567,6 @@ impl LanguageLayer {
     ) -> Vec<tree_sitter::InputEdit> {
         use Operation::*;
         let mut old_pos = 0;
-        let mut new_pos = 0;
 
         let mut edits = Vec::new();
 
@@ -610,9 +610,7 @@ impl LanguageLayer {
             let mut old_end = old_pos + len;
 
             match change {
-                Retain(_) => {
-                    new_pos += len;
-                }
+                Retain(_) => {}
                 Delete(_) => {
                     let (start_byte, start_position) = point_at_pos(old_text, old_pos);
                     let (old_end_byte, old_end_position) = point_at_pos(old_text, old_end);
@@ -636,8 +634,6 @@ impl LanguageLayer {
                 Insert(s) => {
                     let (start_byte, start_position) = point_at_pos(old_text, old_pos);
 
-                    let ins = s.chars().count();
-
                     // a subsequent delete means a replace, consume it
                     if let Some(Delete(len)) = iter.peek() {
                         old_end = old_pos + len;
@@ -665,8 +661,6 @@ impl LanguageLayer {
                             new_end_position: traverse(start_position, s), // old pos + chars, newlines matter too (iter over)
                         });
                     }
-
-                    new_pos += ins;
                 }
             }
             old_pos = old_end;
@@ -1480,7 +1474,6 @@ where
                 // local scope at the top of the scope stack.
                 else if Some(capture.index) == layer.config.local_def_capture_index {
                     reference_highlight = None;
-                    definition_highlight = None;
                     let scope = layer.scope_stack.last_mut().unwrap();
 
                     let mut value_range = 0..0;
@@ -1644,13 +1637,13 @@ fn injection_for_match<'a>(
     (language_name, content_node, include_children)
 }
 
-fn shrink_and_clear<T>(vec: &mut Vec<T>, capacity: usize) {
-    if vec.len() > capacity {
-        vec.truncate(capacity);
-        vec.shrink_to_fit();
-    }
-    vec.clear();
-}
+// fn shrink_and_clear<T>(vec: &mut Vec<T>, capacity: usize) {
+//     if vec.len() > capacity {
+//         vec.truncate(capacity);
+//         vec.shrink_to_fit();
+//     }
+//     vec.clear();
+// }
 
 pub struct Merge<I> {
     iter: I,
@@ -1691,7 +1684,7 @@ impl<I: Iterator<Item = HighlightEvent>> Iterator for Merge<I> {
         loop {
             match (self.next_event, &self.next_span) {
                 // this happens when range is partially or fully offscreen
-                (Some(Source { start, end }), Some((span, range))) if start > range.start => {
+                (Some(Source { start, .. }), Some((span, range))) if start > range.start => {
                     if start > range.end {
                         self.next_span = self.spans.next();
                     } else {
@@ -1711,7 +1704,7 @@ impl<I: Iterator<Item = HighlightEvent>> Iterator for Merge<I> {
                 self.next_event = self.iter.next();
                 Some(HighlightEnd)
             }
-            (Some(Source { start, end }), Some((span, range))) if start < range.start => {
+            (Some(Source { start, end }), Some((_, range))) if start < range.start => {
                 let intersect = range.start.min(end);
                 let event = Source {
                     start,
@@ -1766,7 +1759,7 @@ impl<I: Iterator<Item = HighlightEvent>> Iterator for Merge<I> {
                 Some(event)
             }
             // can happen if deleting and cursor at EOF, and diagnostic reaches past the end
-            (None, Some((span, range))) => {
+            (None, Some((_, _))) => {
                 self.next_span = None;
                 None
             }
@@ -1776,135 +1769,141 @@ impl<I: Iterator<Item = HighlightEvent>> Iterator for Merge<I> {
     }
 }
 
-#[test]
-fn test_parser() {
-    let highlight_names: Vec<String> = [
-        "attribute",
-        "constant",
-        "function.builtin",
-        "function",
-        "keyword",
-        "operator",
-        "property",
-        "punctuation",
-        "punctuation.bracket",
-        "punctuation.delimiter",
-        "string",
-        "string.special",
-        "tag",
-        "type",
-        "type.builtin",
-        "variable",
-        "variable.builtin",
-        "variable.parameter",
-    ]
-    .iter()
-    .cloned()
-    .map(String::from)
-    .collect();
-
-    let language = get_language(Lang::Rust);
-    let mut config = HighlightConfiguration::new(
-        language,
-        &std::fs::read_to_string(
-            "../helix-syntax/languages/tree-sitter-rust/queries/highlights.scm",
-        )
-        .unwrap(),
-        &std::fs::read_to_string(
-            "../helix-syntax/languages/tree-sitter-rust/queries/injections.scm",
-        )
-        .unwrap(),
-        "", // locals.scm
-    )
-    .unwrap();
-    config.configure(&highlight_names);
-
-    let source = Rope::from_str(
-        "
-        struct Stuff {}
-        fn main() {}
-    ",
-    );
-    let syntax = Syntax::new(&source, Arc::new(config));
-    let tree = syntax.tree();
-    let root = tree.root_node();
-    assert_eq!(root.kind(), "source_file");
-
-    assert_eq!(
-        root.to_sexp(),
-        concat!(
-            "(source_file ",
-            "(struct_item name: (type_identifier) body: (field_declaration_list)) ",
-            "(function_item name: (identifier) parameters: (parameters) body: (block)))"
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::{Rope, Transaction};
+
+    #[test]
+    fn test_parser() {
+        let highlight_names: Vec<String> = [
+            "attribute",
+            "constant",
+            "function.builtin",
+            "function",
+            "keyword",
+            "operator",
+            "property",
+            "punctuation",
+            "punctuation.bracket",
+            "punctuation.delimiter",
+            "string",
+            "string.special",
+            "tag",
+            "type",
+            "type.builtin",
+            "variable",
+            "variable.builtin",
+            "variable.parameter",
+        ]
+        .iter()
+        .cloned()
+        .map(String::from)
+        .collect();
+
+        let language = get_language(Lang::Rust);
+        let config = HighlightConfiguration::new(
+            language,
+            &std::fs::read_to_string(
+                "../helix-syntax/languages/tree-sitter-rust/queries/highlights.scm",
+            )
+            .unwrap(),
+            &std::fs::read_to_string(
+                "../helix-syntax/languages/tree-sitter-rust/queries/injections.scm",
+            )
+            .unwrap(),
+            "", // locals.scm
         )
-    );
+        .unwrap();
+        config.configure(&highlight_names);
+
+        let source = Rope::from_str(
+            "
+            struct Stuff {}
+            fn main() {}
+        ",
+        );
+        let syntax = Syntax::new(&source, Arc::new(config));
+        let tree = syntax.tree();
+        let root = tree.root_node();
+        assert_eq!(root.kind(), "source_file");
+
+        assert_eq!(
+            root.to_sexp(),
+            concat!(
+                "(source_file ",
+                "(struct_item name: (type_identifier) body: (field_declaration_list)) ",
+                "(function_item name: (identifier) parameters: (parameters) body: (block)))"
+            )
+        );
 
-    let struct_node = root.child(0).unwrap();
-    assert_eq!(struct_node.kind(), "struct_item");
-}
+        let struct_node = root.child(0).unwrap();
+        assert_eq!(struct_node.kind(), "struct_item");
+    }
 
-#[test]
-fn test_input_edits() {
-    use crate::State;
-    use tree_sitter::InputEdit;
-
-    let mut state = State::new("hello world!\ntest 123".into());
-    let transaction = Transaction::change(
-        &state.doc,
-        vec![(6, 11, Some("test".into())), (12, 17, None)].into_iter(),
-    );
-    let edits = LanguageLayer::generate_edits(state.doc.slice(..), transaction.changes());
-    // transaction.apply(&mut state);
-
-    assert_eq!(
-        edits,
-        &[
-            InputEdit {
-                start_byte: 6,
-                old_end_byte: 11,
-                new_end_byte: 10,
-                start_position: Point { row: 0, column: 6 },
-                old_end_position: Point { row: 0, column: 11 },
-                new_end_position: Point { row: 0, column: 10 }
-            },
-            InputEdit {
-                start_byte: 12,
-                old_end_byte: 17,
-                new_end_byte: 12,
-                start_position: Point { row: 0, column: 12 },
-                old_end_position: Point { row: 1, column: 4 },
-                new_end_position: Point { row: 0, column: 12 }
-            }
-        ]
-    );
-
-    // Testing with the official example from tree-sitter
-    let mut state = State::new("fn test() {}".into());
-    let transaction =
-        Transaction::change(&state.doc, vec![(8, 8, Some("a: u32".into()))].into_iter());
-    let edits = LanguageLayer::generate_edits(state.doc.slice(..), transaction.changes());
-    transaction.apply(&mut state.doc);
-
-    assert_eq!(state.doc, "fn test(a: u32) {}");
-    assert_eq!(
-        edits,
-        &[InputEdit {
-            start_byte: 8,
-            old_end_byte: 8,
-            new_end_byte: 14,
-            start_position: Point { row: 0, column: 8 },
-            old_end_position: Point { row: 0, column: 8 },
-            new_end_position: Point { row: 0, column: 14 }
-        }]
-    );
-}
+    #[test]
+    fn test_input_edits() {
+        use crate::State;
+        use tree_sitter::InputEdit;
+
+        let state = State::new("hello world!\ntest 123".into());
+        let transaction = Transaction::change(
+            &state.doc,
+            vec![(6, 11, Some("test".into())), (12, 17, None)].into_iter(),
+        );
+        let edits = LanguageLayer::generate_edits(state.doc.slice(..), transaction.changes());
+        // transaction.apply(&mut state);
+
+        assert_eq!(
+            edits,
+            &[
+                InputEdit {
+                    start_byte: 6,
+                    old_end_byte: 11,
+                    new_end_byte: 10,
+                    start_position: Point { row: 0, column: 6 },
+                    old_end_position: Point { row: 0, column: 11 },
+                    new_end_position: Point { row: 0, column: 10 }
+                },
+                InputEdit {
+                    start_byte: 12,
+                    old_end_byte: 17,
+                    new_end_byte: 12,
+                    start_position: Point { row: 0, column: 12 },
+                    old_end_position: Point { row: 1, column: 4 },
+                    new_end_position: Point { row: 0, column: 12 }
+                }
+            ]
+        );
+
+        // Testing with the official example from tree-sitter
+        let mut state = State::new("fn test() {}".into());
+        let transaction =
+            Transaction::change(&state.doc, vec![(8, 8, Some("a: u32".into()))].into_iter());
+        let edits = LanguageLayer::generate_edits(state.doc.slice(..), transaction.changes());
+        transaction.apply(&mut state.doc);
+
+        assert_eq!(state.doc, "fn test(a: u32) {}");
+        assert_eq!(
+            edits,
+            &[InputEdit {
+                start_byte: 8,
+                old_end_byte: 8,
+                new_end_byte: 14,
+                start_position: Point { row: 0, column: 8 },
+                old_end_position: Point { row: 0, column: 8 },
+                new_end_position: Point { row: 0, column: 14 }
+            }]
+        );
+    }
 
-#[test]
-fn test_load_runtime_file() {
-    // Test to make sure we can load some data from the runtime directory.
-    let contents = load_runtime_file("rust", "indents.toml").unwrap();
-    assert!(!contents.is_empty());
+    #[test]
+    fn test_load_runtime_file() {
+        // Test to make sure we can load some data from the runtime directory.
+        let contents = load_runtime_file("rust", "indents.toml").unwrap();
+        assert!(!contents.is_empty());
 
-    let results = load_runtime_file("rust", "does-not-exist");
-    assert!(results.is_err());
+        let results = load_runtime_file("rust", "does-not-exist");
+        assert!(results.is_err());
+    }
 }
diff --git a/helix-core/src/transaction.rs b/helix-core/src/transaction.rs
index 10219142..048839b3 100644
--- a/helix-core/src/transaction.rs
+++ b/helix-core/src/transaction.rs
@@ -1,5 +1,5 @@
-use crate::{Range, Rope, Selection, State, Tendril};
-use std::{borrow::Cow, convert::TryFrom};
+use crate::{Range, Rope, Selection, Tendril};
+use std::borrow::Cow;
 
 /// (from, to, replacement)
 pub type Change = (usize, usize, Option<Tendril>);
@@ -163,7 +163,7 @@ impl ChangeSet {
                     head_a = a;
                     head_b = changes_b.next();
                 }
-                (None, val) | (val, None) => return unreachable!("({:?})", val),
+                (None, val) | (val, None) => unreachable!("({:?})", val),
                 (Some(Retain(i)), Some(Retain(j))) => match i.cmp(&j) {
                     Ordering::Less => {
                         changes.retain(i);
@@ -202,7 +202,7 @@ impl ChangeSet {
                         }
                     }
                 }
-                (Some(Insert(mut s)), Some(Retain(j))) => {
+                (Some(Insert(s)), Some(Retain(j))) => {
                     let len = s.chars().count();
                     match len.cmp(&j) {
                         Ordering::Less => {
@@ -274,7 +274,6 @@ impl ChangeSet {
         let mut changes = Self::with_capacity(self.changes.len());
 
         let mut pos = 0;
-        let mut len = 0;
 
         for change in &self.changes {
             use Operation::*;
@@ -581,6 +580,7 @@ impl<'a> Iterator for ChangeIterator<'a> {
 #[cfg(test)]
 mod test {
     use super::*;
+    use crate::State;
 
     #[test]
     fn composition() {
@@ -699,7 +699,7 @@ mod test {
 
     #[test]
     fn changes_iter() {
-        let mut state = State::new("hello world!\ntest 123".into());
+        let state = State::new("hello world!\ntest 123".into());
         let changes = vec![(6, 11, Some("void".into())), (12, 17, None)];
         let transaction = Transaction::change(&state.doc, changes.clone().into_iter());
         assert_eq!(transaction.changes_iter().collect::<Vec<_>>(), changes);
@@ -731,7 +731,7 @@ mod test {
         // retain 1, e
         // retain 2, l
 
-        let mut changes = t1
+        let changes = t1
             .changes
             .compose(t2.changes)
             .compose(t3.changes)
@@ -746,7 +746,7 @@ mod test {
     #[test]
     fn combine_with_empty() {
         let empty = Rope::from("");
-        let mut a = ChangeSet::new(&empty);
+        let a = ChangeSet::new(&empty);
 
         let mut b = ChangeSet::new(&empty);
         b.insert("a".into());
@@ -762,7 +762,7 @@ mod test {
         const TEST_CASE: &'static str = "Hello, これはヘリックスエディターです！";
 
         let empty = Rope::from("");
-        let mut a = ChangeSet::new(&empty);
+        let a = ChangeSet::new(&empty);
 
         let mut b = ChangeSet::new(&empty);
         b.insert(TEST_CASE.into());
diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index 3d20e1b3..9622ad91 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -1,37 +1,23 @@
 use helix_core::syntax;
-use helix_lsp::{lsp, LspProgressMap};
-use helix_view::{document::Mode, graphics::Rect, theme, Document, Editor, Theme, View};
-
-use crate::{
-    args::Args,
-    compositor::Compositor,
-    config::Config,
-    job::Jobs,
-    keymap::Keymaps,
-    ui::{self, Spinner},
-};
+use helix_lsp::{lsp, util::lsp_pos_to_pos, LspProgressMap};
+use helix_view::{theme, Editor};
+
+use crate::{args::Args, compositor::Compositor, config::Config, job::Jobs, ui};
 
-use log::{error, info};
+use log::error;
 
 use std::{
-    collections::HashMap,
-    future::Future,
-    io::{self, stdout, Stdout, Write},
-    path::PathBuf,
-    pin::Pin,
+    io::{stdout, Write},
     sync::Arc,
-    time::Duration,
 };
 
-use anyhow::{Context, Error};
+use anyhow::Error;
 
 use crossterm::{
     event::{Event, EventStream},
     execute, terminal,
 };
 
-use futures_util::{future, stream::FuturesUnordered};
-
 pub struct Application {
     compositor: Compositor,
     editor: Editor,
@@ -39,7 +25,14 @@ pub struct Application {
     // TODO should be separate to take only part of the config
     config: Config,
 
+    // Currently never read from.  Remove the `allow(dead_code)` when
+    // that changes.
+    #[allow(dead_code)]
     theme_loader: Arc<theme::Loader>,
+
+    // Currently never read from.  Remove the `allow(dead_code)` when
+    // that changes.
+    #[allow(dead_code)]
     syn_loader: Arc<syntax::Loader>,
 
     jobs: Jobs,
@@ -47,7 +40,7 @@ pub struct Application {
 }
 
 impl Application {
-    pub fn new(mut args: Args, mut config: Config) -> Result<Self, Error> {
+    pub fn new(args: Args, mut config: Config) -> Result<Self, Error> {
         use helix_view::editor::Action;
         let mut compositor = Compositor::new()?;
         let size = compositor.size();
@@ -80,7 +73,7 @@ impl Application {
 
         let mut editor = Editor::new(size, theme_loader.clone(), syn_loader.clone());
 
-        let mut editor_view = Box::new(ui::EditorView::new(std::mem::take(&mut config.keys)));
+        let editor_view = Box::new(ui::EditorView::new(std::mem::take(&mut config.keys)));
         compositor.push(editor_view);
 
         if !args.files.is_empty() {
@@ -105,7 +98,7 @@ impl Application {
 
         editor.set_theme(theme);
 
-        let mut app = Self {
+        let app = Self {
             compositor,
             editor,
 
@@ -239,10 +232,9 @@ impl Application {
                                 .into_iter()
                                 .filter_map(|diagnostic| {
                                     use helix_core::{
-                                        diagnostic::{Range, Severity, Severity::*},
+                                        diagnostic::{Range, Severity::*},
                                         Diagnostic,
                                     };
-                                    use helix_lsp::{lsp, util::lsp_pos_to_pos};
                                     use lsp::DiagnosticSeverity;
 
                                     let language_server = doc.language_server().unwrap();
@@ -372,14 +364,10 @@ impl Application {
                             self.editor.set_status(status);
                         }
                     }
-                    _ => unreachable!(),
                 }
             }
             Call::MethodCall(helix_lsp::jsonrpc::MethodCall {
-                method,
-                params,
-                jsonrpc,
-                id,
+                method, params, id, ..
             }) => {
                 let call = match MethodCall::parse(&method, params) {
                     Some(call) => call,
@@ -459,17 +447,20 @@ impl Application {
         // Exit the alternate screen and disable raw mode before panicking
         let hook = std::panic::take_hook();
         std::panic::set_hook(Box::new(move |info| {
-            execute!(std::io::stdout(), terminal::LeaveAlternateScreen);
-            terminal::disable_raw_mode();
+            // We can't handle errors properly inside this closure.  And it's
+            // probably not a good idea to `unwrap()` inside a panic handler.
+            // So we just ignore the `Result`s.
+            let _ = execute!(std::io::stdout(), terminal::LeaveAlternateScreen);
+            let _ = terminal::disable_raw_mode();
             hook(info);
         }));
 
         self.event_loop().await;
 
-        self.editor.close_language_servers(None).await;
+        self.editor.close_language_servers(None).await?;
 
         // reset cursor shape
-        write!(stdout, "\x1B[2 q");
+        write!(stdout, "\x1B[2 q")?;
 
         execute!(stdout, terminal::LeaveAlternateScreen)?;
 
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index 66b05ad2..e76962f0 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -1,20 +1,21 @@
 use helix_core::{
     comment, coords_at_pos, find_first_non_whitespace_char, find_root, graphemes, indent,
     line_ending::{
-        get_line_ending, get_line_ending_of_str, line_end_char_index, rope_end_without_line_ending,
+        get_line_ending_of_str, line_end_char_index, rope_end_without_line_ending,
         str_is_line_ending,
     },
     match_brackets,
     movement::{self, Direction},
     object, pos_at_coords,
     regex::{self, Regex},
-    register::{self, Register, Registers},
-    search, selection, Change, ChangeSet, LineEnding, Position, Range, Rope, RopeGraphemes,
-    RopeSlice, Selection, SmallVec, Tendril, Transaction, DEFAULT_LINE_ENDING,
+    register::Register,
+    search, selection, LineEnding, Position, Range, Rope, RopeGraphemes, RopeSlice, Selection,
+    SmallVec, Tendril, Transaction,
 };
 
 use helix_view::{
     document::{IndentStyle, Mode},
+    editor::Action,
     input::KeyEvent,
     keyboard::KeyCode,
     view::{View, PADDING},
@@ -25,19 +26,19 @@ use anyhow::anyhow;
 use helix_lsp::{
     lsp,
     util::{lsp_pos_to_pos, lsp_range_to_range, pos_to_lsp_pos, range_to_lsp_range},
-    LspProgressMap, OffsetEncoding,
+    OffsetEncoding,
 };
 use insert::*;
 use movement::Movement;
 
 use crate::{
-    compositor::{self, Callback, Component, Compositor},
-    ui::{self, Completion, Picker, Popup, Prompt, PromptEvent},
+    compositor::{self, Component, Compositor},
+    ui::{self, Picker, Popup, Prompt, PromptEvent},
 };
 
-use crate::job::{self, Job, JobFuture, Jobs};
+use crate::job::{self, Job, Jobs};
 use futures_util::{FutureExt, TryFutureExt};
-use std::{fmt, future::Future, path::Display, str::FromStr};
+use std::{fmt, future::Future};
 
 use std::{
     borrow::Cow,
@@ -59,7 +60,7 @@ pub struct Context<'a> {
 
 impl<'a> Context<'a> {
     /// Push a new component onto the compositor.
-    pub fn push_layer(&mut self, mut component: Box<dyn Component>) {
+    pub fn push_layer(&mut self, component: Box<dyn Component>) {
         self.callback = Some(Box::new(|compositor: &mut Compositor| {
             compositor.push(component)
         }));
@@ -515,7 +516,7 @@ fn extend_next_word_start(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     doc.set_selection(
         view.id,
-        doc.selection(view.id).clone().transform(|mut range| {
+        doc.selection(view.id).clone().transform(|range| {
             let word = movement::move_next_word_start(doc.text().slice(..), range, count);
             let pos = word.head;
             Range::new(range.anchor, pos)
@@ -528,7 +529,7 @@ fn extend_prev_word_start(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     doc.set_selection(
         view.id,
-        doc.selection(view.id).clone().transform(|mut range| {
+        doc.selection(view.id).clone().transform(|range| {
             let word = movement::move_prev_word_start(doc.text().slice(..), range, count);
             let pos = word.head;
             Range::new(range.anchor, pos)
@@ -541,7 +542,7 @@ fn extend_next_word_end(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     doc.set_selection(
         view.id,
-        doc.selection(view.id).clone().transform(|mut range| {
+        doc.selection(view.id).clone().transform(|range| {
             let word = movement::move_next_word_end(doc.text().slice(..), range, count);
             let pos = word.head;
             Range::new(range.anchor, pos)
@@ -592,7 +593,7 @@ where
 
         doc.set_selection(
             view.id,
-            doc.selection(view.id).clone().transform(|mut range| {
+            doc.selection(view.id).clone().transform(|range| {
                 search_fn(doc.text().slice(..), ch, range.head, count, inclusive).map_or(
                     range,
                     |pos| {
@@ -986,7 +987,7 @@ fn search_impl(doc: &mut Document, view: &mut View, contents: &str, regex: &Rege
 
 // TODO: use one function for search vs extend
 fn search(cx: &mut Context) {
-    let (view, doc) = current!(cx.editor);
+    let (_, doc) = current!(cx.editor);
 
     // TODO: could probably share with select_on_matches?
 
@@ -994,7 +995,6 @@ fn search(cx: &mut Context) {
     // feed chunks into the regex yet
     let contents = doc.text().slice(..).to_string();
 
-    let view_id = view.id;
     let prompt = ui::regex_prompt(
         cx,
         "search:".to_string(),
@@ -1046,7 +1046,7 @@ fn extend_line(cx: &mut Context) {
     let line_start = text.char_to_line(pos.anchor);
     let start = text.line_to_char(line_start);
     let line_end = text.char_to_line(pos.head);
-    let mut end = line_end_char_index(&text.slice(..), line_end);
+    let mut end = line_end_char_index(&text.slice(..), line_end + count.saturating_sub(1));
 
     if pos.anchor == start && pos.head == end && line_end < (text.len_lines() - 2) {
         end = line_end_char_index(&text.slice(..), line_end + 1);
@@ -1065,7 +1065,6 @@ fn delete_selection_impl(reg: &mut Register, doc: &mut Document, view_id: ViewId
 
     // then delete
     let transaction = Transaction::change_by_selection(doc.text(), &selection, |range| {
-        let line = text.char_to_line(range.head);
         (range.from(), range.to(), None)
     });
     doc.apply(&transaction, view_id);
@@ -1175,7 +1174,7 @@ mod cmd {
         pub completer: Option<Completer>,
     }
 
-    fn quit(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn quit(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         // last view and we have unsaved changes
         if cx.editor.tree.views().count() == 1 && buffers_remaining_impl(cx.editor) {
             return;
@@ -1184,16 +1183,16 @@ mod cmd {
             .close(view!(cx.editor).id, /* close_buffer */ false);
     }
 
-    fn force_quit(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn force_quit(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         cx.editor
             .close(view!(cx.editor).id, /* close_buffer */ false);
     }
 
-    fn open(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn open(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         match args.get(0) {
             Some(path) => {
                 // TODO: handle error
-                cx.editor.open(path.into(), Action::Replace);
+                let _ = cx.editor.open(path.into(), Action::Replace);
             }
             None => {
                 cx.editor.set_error("wrong argument count".to_string());
@@ -1205,9 +1204,8 @@ mod cmd {
         cx: &mut compositor::Context,
         path: Option<P>,
     ) -> Result<tokio::task::JoinHandle<Result<(), anyhow::Error>>, anyhow::Error> {
-        use anyhow::anyhow;
         let jobs = &mut cx.jobs;
-        let (view, doc) = current!(cx.editor);
+        let (_, doc) = current!(cx.editor);
 
         if let Some(path) = path {
             if let Err(err) = doc.set_path(path.as_ref()) {
@@ -1231,7 +1229,7 @@ mod cmd {
         Ok(tokio::spawn(doc.format_and_save(fmt)))
     }
 
-    fn write(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn write(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         match write_impl(cx, args.first()) {
             Err(e) => cx.editor.set_error(e.to_string()),
             Ok(handle) => {
@@ -1241,11 +1239,11 @@ mod cmd {
         };
     }
 
-    fn new_file(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn new_file(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         cx.editor.new_file(Action::Replace);
     }
 
-    fn format(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn format(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         let (_, doc) = current!(cx.editor);
 
         if let Some(format) = doc.format() {
@@ -1255,7 +1253,7 @@ mod cmd {
         }
     }
 
-    fn set_indent_style(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn set_indent_style(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         use IndentStyle::*;
 
         // If no argument, report current indent style.
@@ -1293,7 +1291,7 @@ mod cmd {
     }
 
     /// Sets or reports the current document's line ending setting.
-    fn set_line_ending(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn set_line_ending(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         use LineEnding::*;
 
         // If no argument, report current line ending setting.
@@ -1332,7 +1330,7 @@ mod cmd {
         }
     }
 
-    fn earlier(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn earlier(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         let uk = match args.join(" ").parse::<helix_core::history::UndoKind>() {
             Ok(uk) => uk,
             Err(msg) => {
@@ -1344,7 +1342,7 @@ mod cmd {
         doc.earlier(view.id, uk)
     }
 
-    fn later(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn later(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         let uk = match args.join(" ").parse::<helix_core::history::UndoKind>() {
             Ok(uk) => uk,
             Err(msg) => {
@@ -1372,7 +1370,6 @@ mod cmd {
     }
 
     fn force_write_quit(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
-        let (view, doc) = current!(cx.editor);
         match write_impl(cx, args.first()) {
             Ok(handle) => {
                 if let Err(e) = helix_lsp::block_on(handle) {
@@ -1414,20 +1411,22 @@ mod cmd {
 
     fn write_all_impl(
         editor: &mut Editor,
-        args: &[&str],
-        event: PromptEvent,
+        _args: &[&str],
+        _event: PromptEvent,
         quit: bool,
         force: bool,
     ) {
         let mut errors = String::new();
 
         // save all documents
-        for (id, mut doc) in &mut editor.documents {
+        for (_, doc) in &mut editor.documents {
             if doc.path().is_none() {
                 errors.push_str("cannot write a buffer without a filename\n");
                 continue;
             }
-            helix_lsp::block_on(tokio::spawn(doc.save()));
+
+            // TODO: handle error.
+            let _ = helix_lsp::block_on(tokio::spawn(doc.save()));
         }
         editor.set_error(errors);
 
@@ -1456,7 +1455,7 @@ mod cmd {
         write_all_impl(&mut cx.editor, args, event, true, true)
     }
 
-    fn quit_all_impl(editor: &mut Editor, args: &[&str], event: PromptEvent, force: bool) {
+    fn quit_all_impl(editor: &mut Editor, _args: &[&str], _event: PromptEvent, force: bool) {
         if !force && buffers_remaining_impl(editor) {
             return;
         }
@@ -1476,7 +1475,7 @@ mod cmd {
         quit_all_impl(&mut cx.editor, args, event, true)
     }
 
-    fn theme(cx: &mut compositor::Context, args: &[&str], event: PromptEvent) {
+    fn theme(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         let theme = if let Some(theme) = args.first() {
             theme
         } else {
@@ -1487,11 +1486,15 @@ mod cmd {
         cx.editor.set_theme_from_name(theme);
     }
 
-    fn yank_main_selection_to_clipboard(cx: &mut compositor::Context, _: &[&str], _: PromptEvent) {
+    fn yank_main_selection_to_clipboard(
+        cx: &mut compositor::Context,
+        _args: &[&str],
+        _event: PromptEvent,
+    ) {
         yank_main_selection_to_clipboard_impl(&mut cx.editor);
     }
 
-    fn yank_joined_to_clipboard(cx: &mut compositor::Context, args: &[&str], _: PromptEvent) {
+    fn yank_joined_to_clipboard(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         let (_, doc) = current!(cx.editor);
         let separator = args
             .first()
@@ -1500,15 +1503,19 @@ mod cmd {
         yank_joined_to_clipboard_impl(&mut cx.editor, separator);
     }
 
-    fn paste_clipboard_after(cx: &mut compositor::Context, _: &[&str], _: PromptEvent) {
+    fn paste_clipboard_after(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         paste_clipboard_impl(&mut cx.editor, Paste::After);
     }
 
-    fn paste_clipboard_before(cx: &mut compositor::Context, _: &[&str], _: PromptEvent) {
+    fn paste_clipboard_before(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         paste_clipboard_impl(&mut cx.editor, Paste::After);
     }
 
-    fn replace_selections_with_clipboard(cx: &mut compositor::Context, _: &[&str], _: PromptEvent) {
+    fn replace_selections_with_clipboard(
+        cx: &mut compositor::Context,
+        _args: &[&str],
+        _event: PromptEvent,
+    ) {
         let (view, doc) = current!(cx.editor);
 
         match cx.editor.clipboard_provider.get_contents() {
@@ -1529,12 +1536,12 @@ mod cmd {
         }
     }
 
-    fn show_clipboard_provider(cx: &mut compositor::Context, _: &[&str], _: PromptEvent) {
+    fn show_clipboard_provider(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         cx.editor
             .set_status(cx.editor.clipboard_provider.name().into());
     }
 
-    fn change_current_directory(cx: &mut compositor::Context, args: &[&str], _: PromptEvent) {
+    fn change_current_directory(cx: &mut compositor::Context, args: &[&str], _event: PromptEvent) {
         let dir = match args.first() {
             Some(dir) => dir,
             None => {
@@ -1562,7 +1569,7 @@ mod cmd {
         }
     }
 
-    fn show_current_directory(cx: &mut compositor::Context, args: &[&str], _: PromptEvent) {
+    fn show_current_directory(cx: &mut compositor::Context, _args: &[&str], _event: PromptEvent) {
         match std::env::current_dir() {
             Ok(cwd) => cx
                 .editor
@@ -1782,7 +1789,6 @@ fn command_mode(cx: &mut Context) {
             // simple heuristic: if there's no just one part, complete command name.
             // if there's a space, per command completion kicks in.
             if parts.len() <= 1 {
-                use std::{borrow::Cow, ops::Range};
                 let end = 0..;
                 cmd::TYPABLE_COMMAND_LIST
                     .iter()
@@ -1812,8 +1818,6 @@ fn command_mode(cx: &mut Context) {
             }
         }, // completion
         move |cx: &mut compositor::Context, input: &str, event: PromptEvent| {
-            use helix_view::editor::Action;
-
             if event != PromptEvent::Validate {
                 return;
             }
@@ -1851,7 +1855,6 @@ fn file_picker(cx: &mut Context) {
 }
 
 fn buffer_picker(cx: &mut Context) {
-    use std::path::{Path, PathBuf};
     let current = view!(cx.editor).doc;
 
     let picker = Picker::new(
@@ -1874,7 +1877,6 @@ fn buffer_picker(cx: &mut Context) {
             }
         },
         |editor: &mut Editor, (id, _path): &(DocumentId, Option<PathBuf>), _action| {
-            use helix_view::editor::Action;
             editor.switch(*id, Action::Replace);
         },
     );
@@ -1900,7 +1902,7 @@ fn symbol_picker(cx: &mut Context) {
             nested_to_flat(list, file, child);
         }
     }
-    let (view, doc) = current!(cx.editor);
+    let (_, doc) = current!(cx.editor);
 
     let language_server = match doc.language_server() {
         Some(language_server) => language_server,
@@ -1993,7 +1995,7 @@ async fn make_format_callback(
     format: impl Future<Output = helix_lsp::util::LspFormatting> + Send + 'static,
 ) -> anyhow::Result<job::Callback> {
     let format = format.await;
-    let call: job::Callback = Box::new(move |editor: &mut Editor, compositor: &mut Compositor| {
+    let call: job::Callback = Box::new(move |editor: &mut Editor, _compositor: &mut Compositor| {
         let view_id = view!(editor).id;
         if let Some(doc) = editor.document_mut(doc_id) {
             if doc.version() == doc_version {
@@ -2168,9 +2170,6 @@ fn goto_mode(cx: &mut Context) {
                 (_, 't') | (_, 'm') | (_, 'b') => {
                     let (view, doc) = current!(cx.editor);
 
-                    let pos = doc.selection(view.id).cursor();
-                    let line = doc.text().char_to_line(pos);
-
                     let scrolloff = PADDING.min(view.area.height as usize / 2); // TODO: user pref
 
                     let last_line = view.last_line(doc);
@@ -2207,8 +2206,6 @@ fn goto_impl(
     locations: Vec<lsp::Location>,
     offset_encoding: OffsetEncoding,
 ) {
-    use helix_view::editor::Action;
-
     push_jump(editor);
 
     fn jump_to(
@@ -2221,7 +2218,7 @@ fn goto_impl(
             .uri
             .to_file_path()
             .expect("unable to convert URI to filepath");
-        let id = editor.open(path, action).expect("editor.open failed");
+        let _id = editor.open(path, action).expect("editor.open failed");
         let (view, doc) = current!(editor);
         let definition_pos = location.range.start;
         // TODO: convert inside server
@@ -2243,7 +2240,7 @@ fn goto_impl(
             editor.set_error("No definition found.".to_string());
         }
         _locations => {
-            let mut picker = ui::Picker::new(
+            let picker = ui::Picker::new(
                 locations,
                 |location| {
                     let file = location.uri.as_str();
@@ -2410,9 +2407,8 @@ fn goto_pos(editor: &mut Editor, pos: usize) {
 
 fn goto_first_diag(cx: &mut Context) {
     let editor = &mut cx.editor;
-    let (view, doc) = current!(editor);
+    let (_, doc) = current!(editor);
 
-    let cursor_pos = doc.selection(view.id).cursor();
     let diag = if let Some(diag) = doc.diagnostics().first() {
         diag.range.start
     } else {
@@ -2424,9 +2420,8 @@ fn goto_first_diag(cx: &mut Context) {
 
 fn goto_last_diag(cx: &mut Context) {
     let editor = &mut cx.editor;
-    let (view, doc) = current!(editor);
+    let (_, doc) = current!(editor);
 
-    let cursor_pos = doc.selection(view.id).cursor();
     let diag = if let Some(diag) = doc.diagnostics().last() {
         diag.range.start
     } else {
@@ -2498,8 +2493,8 @@ fn signature_help(cx: &mut Context) {
 
     cx.callback(
         future,
-        move |editor: &mut Editor,
-              compositor: &mut Compositor,
+        move |_editor: &mut Editor,
+              _compositor: &mut Compositor,
               response: Option<lsp::SignatureHelp>| {
             if let Some(signature_help) = response {
                 log::info!("{:?}", signature_help);
@@ -3080,8 +3075,10 @@ fn format_selections(cx: &mut Context) {
         .map(|range| range_to_lsp_range(doc.text(), *range, language_server.offset_encoding()))
         .collect();
 
-    for range in ranges {
-        let language_server = match doc.language_server() {
+    // TODO: all of the TODO's and commented code inside the loop,
+    // to make this actually work.
+    for _range in ranges {
+        let _language_server = match doc.language_server() {
             Some(language_server) => language_server,
             None => return,
         };
@@ -3129,7 +3126,7 @@ fn join_selections(cx: &mut Context) {
         changes.reserve(lines.len());
 
         for line in lines {
-            let mut start = line_end_char_index(&slice, line);
+            let start = line_end_char_index(&slice, line);
             let mut end = text.line_to_char(line + 1);
             end = skip_while(slice, end, |ch| matches!(ch, ' ' | '\t')).unwrap_or(end);
 
@@ -3252,7 +3249,6 @@ fn completion(cx: &mut Context) {
             if items.is_empty() {
                 return;
             }
-            use crate::compositor::AnyComponent;
             let size = compositor.size();
             let ui = compositor
                 .find(std::any::type_name::<ui::EditorView>())
@@ -3306,7 +3302,7 @@ fn hover(cx: &mut Context) {
                 // skip if contents empty
 
                 let contents = ui::Markdown::new(contents, editor.syn_loader.clone());
-                let mut popup = Popup::new(contents);
+                let popup = Popup::new(contents);
                 compositor.push(Box::new(popup));
             }
         },
@@ -3350,7 +3346,7 @@ fn match_brackets(cx: &mut Context) {
 
 fn jump_forward(cx: &mut Context) {
     let count = cx.count();
-    let (view, doc) = current!(cx.editor);
+    let (view, _doc) = current!(cx.editor);
 
     if let Some((id, selection)) = view.jumps.forward(count) {
         view.doc = *id;
@@ -3403,11 +3399,7 @@ fn rotate_view(cx: &mut Context) {
 }
 
 // split helper, clear it later
-use helix_view::editor::Action;
-
-use self::cmd::TypableCommand;
 fn split(cx: &mut Context, action: Action) {
-    use helix_view::editor::Action;
     let (view, doc) = current!(cx.editor);
     let id = doc.id();
     let selection = doc.selection(view.id).clone();
@@ -3563,10 +3555,7 @@ fn match_mode(cx: &mut Context) {
                 'm' => match_brackets(cx),
                 's' => surround_add(cx),
                 'r' => surround_replace(cx),
-                'd' => {
-                    surround_delete(cx);
-                    let (view, doc) = current!(cx.editor);
-                }
+                'd' => surround_delete(cx),
                 _ => (),
             }
         }
@@ -3588,7 +3577,7 @@ fn surround_add(cx: &mut Context) {
             let (open, close) = surround::get_pair(ch);
 
             let mut changes = Vec::new();
-            for (i, range) in selection.iter().enumerate() {
+            for range in selection.iter() {
                 changes.push((range.from(), range.from(), Some(Tendril::from_char(open))));
                 changes.push((range.to(), range.to(), Some(Tendril::from_char(close))));
             }
diff --git a/helix-term/src/compositor.rs b/helix-term/src/compositor.rs
index ba8c4bc7..5fcb552a 100644
--- a/helix-term/src/compositor.rs
+++ b/helix-term/src/compositor.rs
@@ -2,7 +2,6 @@
 // Q: how does this work with popups?
 // cursive does compositor.screen_mut().add_layer_at(pos::absolute(x, y), <component>)
 use helix_core::Position;
-use helix_lsp::LspProgressMap;
 use helix_view::graphics::{CursorKind, Rect};
 
 use crossterm::event::Event;
@@ -36,7 +35,7 @@ pub struct Context<'a> {
 
 pub trait Component: Any + AnyComponent {
     /// Process input events, return true if handled.
-    fn handle_event(&mut self, event: Event, ctx: &mut Context) -> EventResult {
+    fn handle_event(&mut self, _event: Event, _ctx: &mut Context) -> EventResult {
         EventResult::Ignored
     }
     // , args: ()
@@ -50,13 +49,13 @@ pub trait Component: Any + AnyComponent {
     fn render(&self, area: Rect, frame: &mut Surface, ctx: &mut Context);
 
     /// Get cursor position and cursor kind.
-    fn cursor(&self, area: Rect, ctx: &Editor) -> (Option<Position>, CursorKind) {
+    fn cursor(&self, _area: Rect, _ctx: &Editor) -> (Option<Position>, CursorKind) {
         (None, CursorKind::Hidden)
     }
 
     /// May be used by the parent component to compute the child area.
     /// viewport is the maximum allowed area, and the child should stay within those bounds.
-    fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
+    fn required_size(&mut self, _viewport: (u16, u16)) -> Option<(u16, u16)> {
         // TODO: for scrolling, the scroll wrapper should place a size + offset on the Context
         // that way render can use it
         None
@@ -80,7 +79,7 @@ pub struct Compositor {
 impl Compositor {
     pub fn new() -> Result<Self, Error> {
         let backend = CrosstermBackend::new(stdout());
-        let mut terminal = Terminal::new(backend)?;
+        let terminal = Terminal::new(backend)?;
         Ok(Self {
             layers: Vec::new(),
             terminal,
@@ -125,8 +124,7 @@ impl Compositor {
     }
 
     pub fn render(&mut self, cx: &mut Context) {
-        let area = self
-            .terminal
+        self.terminal
             .autoresize()
             .expect("Unable to determine terminal size");
 
@@ -143,7 +141,7 @@ impl Compositor {
         let (pos, kind) = self.cursor(area, cx.editor);
         let pos = pos.map(|pos| (pos.col as u16, pos.row as u16));
 
-        self.terminal.draw(pos, kind);
+        self.terminal.draw(pos, kind).unwrap();
     }
 
     pub fn cursor(&self, area: Rect, editor: &Editor) -> (Option<Position>, CursorKind) {
diff --git a/helix-term/src/config.rs b/helix-term/src/config.rs
index 3c05144a..b5ccbdfb 100644
--- a/helix-term/src/config.rs
+++ b/helix-term/src/config.rs
@@ -1,10 +1,10 @@
-use anyhow::{Error, Result};
 use serde::Deserialize;
-use std::collections::HashMap;
 
-use crate::commands::Command;
 use crate::keymap::Keymaps;
 
+#[cfg(test)]
+use crate::commands::Command;
+
 #[derive(Debug, Default, Clone, PartialEq, Deserialize)]
 pub struct Config {
     pub theme: Option<String>,
diff --git a/helix-term/src/job.rs b/helix-term/src/job.rs
index 4b59c81c..c2873513 100644
--- a/helix-term/src/job.rs
+++ b/helix-term/src/job.rs
@@ -3,7 +3,7 @@ use helix_view::Editor;
 use crate::compositor::Compositor;
 
 use futures_util::future::{self, BoxFuture, Future, FutureExt};
-use futures_util::stream::{self, FuturesUnordered, Select, StreamExt};
+use futures_util::stream::{FuturesUnordered, StreamExt};
 
 pub type Callback = Box<dyn FnOnce(&mut Editor, &mut Compositor) + Send>;
 pub type JobFuture = BoxFuture<'static, anyhow::Result<Option<Callback>>>;
diff --git a/helix-term/src/keymap.rs b/helix-term/src/keymap.rs
index 22731d16..53588a2b 100644
--- a/helix-term/src/keymap.rs
+++ b/helix-term/src/keymap.rs
@@ -1,7 +1,5 @@
-use crate::commands;
 pub use crate::commands::Command;
 use crate::config::Config;
-use anyhow::{anyhow, Error, Result};
 use helix_core::hashmap;
 use helix_view::{
     document::Mode,
@@ -11,9 +9,7 @@ use helix_view::{
 use serde::Deserialize;
 use std::{
     collections::HashMap,
-    fmt::Display,
     ops::{Deref, DerefMut},
-    str::FromStr,
 };
 
 // Kakoune-inspired:
diff --git a/helix-term/src/lib.rs b/helix-term/src/lib.rs
index 3f288188..f5e3a8cd 100644
--- a/helix-term/src/lib.rs
+++ b/helix-term/src/lib.rs
@@ -1,5 +1,3 @@
-#![allow(unused)]
-
 #[macro_use]
 extern crate helix_view;
 
diff --git a/helix-term/src/ui/completion.rs b/helix-term/src/ui/completion.rs
index 74a82dab..be6db42c 100644
--- a/helix-term/src/ui/completion.rs
+++ b/helix-term/src/ui/completion.rs
@@ -1,19 +1,16 @@
-use crate::compositor::{Component, Compositor, Context, EventResult};
-use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
+use crate::compositor::{Component, Context, EventResult};
+use crossterm::event::{Event, KeyCode, KeyEvent};
 use tui::buffer::Buffer as Surface;
 
 use std::borrow::Cow;
 
-use helix_core::{Position, Transaction};
-use helix_view::{
-    graphics::{Color, Rect, Style},
-    Editor,
-};
+use helix_core::Transaction;
+use helix_view::{graphics::Rect, Editor};
 
 use crate::commands;
 use crate::ui::{menu, Markdown, Menu, Popup, PromptEvent};
 
-use helix_lsp::lsp;
+use helix_lsp::{lsp, util};
 use lsp::CompletionItem;
 
 impl menu::Item for CompletionItem {
@@ -79,7 +76,7 @@ impl Completion {
         trigger_offset: usize,
     ) -> Self {
         // let items: Vec<CompletionItem> = Vec::new();
-        let mut menu = Menu::new(items, move |editor: &mut Editor, item, event| {
+        let menu = Menu::new(items, move |editor: &mut Editor, item, event| {
             match event {
                 PromptEvent::Abort => {}
                 PromptEvent::Validate => {
@@ -88,8 +85,6 @@ impl Completion {
                     // always present here
                     let item = item.unwrap();
 
-                    use helix_lsp::{lsp, util};
-
                     // if more text was entered, remove it
                     let cursor = doc.selection(view.id).cursor();
                     if trigger_offset < cursor {
@@ -100,7 +95,6 @@ impl Completion {
                         doc.apply(&remove, view.id);
                     }
 
-                    use helix_lsp::OffsetEncoding;
                     let transaction = if let Some(edit) = &item.text_edit {
                         let edit = match edit {
                             lsp::CompletionTextEdit::Edit(edit) => edit.clone(),
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index d2925e35..138456ca 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -1,32 +1,28 @@
 use crate::{
     commands,
-    compositor::{Component, Compositor, Context, EventResult},
+    compositor::{Component, Context, EventResult},
     key,
-    keymap::{self, Keymaps},
+    keymap::Keymaps,
     ui::{Completion, ProgressSpinners},
 };
 
 use helix_core::{
     coords_at_pos,
     graphemes::ensure_grapheme_boundary_next,
-    syntax::{self, Highlight, HighlightEvent},
+    syntax::{self, HighlightEvent},
     LineEnding, Position, Range,
 };
-use helix_lsp::LspProgressMap;
 use helix_view::{
     document::Mode,
-    graphics::{Color, CursorKind, Modifier, Rect, Style},
+    graphics::{CursorKind, Modifier, Rect, Style},
     input::KeyEvent,
     keyboard::{KeyCode, KeyModifiers},
     Document, Editor, Theme, View,
 };
 use std::borrow::Cow;
 
-use crossterm::{
-    cursor,
-    event::{read, Event, EventStream},
-};
-use tui::{backend::CrosstermBackend, buffer::Buffer as Surface};
+use crossterm::event::Event;
+use tui::buffer::Buffer as Surface;
 
 pub struct EditorView {
     keymaps: Keymaps,
@@ -396,7 +392,7 @@ impl EditorView {
         viewport: Rect,
         surface: &mut Surface,
         theme: &Theme,
-        is_focused: bool,
+        _is_focused: bool,
     ) {
         use helix_core::diagnostic::Severity;
         use tui::{
@@ -406,7 +402,6 @@ impl EditorView {
         };
 
         let cursor = doc.selection(view.id).cursor();
-        let line = doc.text().char_to_line(cursor);
 
         let diagnostics = doc.diagnostics().iter().filter(|diagnostic| {
             diagnostic.range.start <= cursor && diagnostic.range.end >= cursor
@@ -612,7 +607,7 @@ impl Component for EditorView {
                 // clear status
                 cx.editor.status_msg = None;
 
-                let (view, doc) = current!(cx.editor);
+                let (_, doc) = current!(cx.editor);
                 let mode = doc.mode();
 
                 let mut cxt = commands::Context {
@@ -709,7 +704,7 @@ impl Component for EditorView {
         }
     }
 
-    fn render(&self, mut area: Rect, surface: &mut Surface, cx: &mut Context) {
+    fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
         // clear with background color
         surface.set_style(area, cx.editor.theme.get("ui.background"));
 
@@ -745,7 +740,7 @@ impl Component for EditorView {
         }
     }
 
-    fn cursor(&self, area: Rect, editor: &Editor) -> (Option<Position>, CursorKind) {
+    fn cursor(&self, _area: Rect, editor: &Editor) -> (Option<Position>, CursorKind) {
         // match view.doc.mode() {
         //     Mode::Insert => write!(stdout, "\x1B[6 q"),
         //     mode => write!(stdout, "\x1B[2 q"),
diff --git a/helix-term/src/ui/markdown.rs b/helix-term/src/ui/markdown.rs
index 36d570cd..6c79ca67 100644
--- a/helix-term/src/ui/markdown.rs
+++ b/helix-term/src/ui/markdown.rs
@@ -1,13 +1,20 @@
-use crate::compositor::{Component, Compositor, Context, EventResult};
-use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
-use tui::{buffer::Buffer as Surface, text::Text};
+use crate::compositor::{Component, Context};
+use tui::{
+    buffer::Buffer as Surface,
+    text::{Span, Spans, Text},
+};
+
+use std::sync::Arc;
 
-use std::{borrow::Cow, sync::Arc};
+use pulldown_cmark::{CodeBlockKind, CowStr, Event, Options, Parser, Tag};
 
-use helix_core::{syntax, Position};
+use helix_core::{
+    syntax::{self, HighlightEvent, Syntax},
+    Rope,
+};
 use helix_view::{
     graphics::{Color, Rect, Style},
-    Editor, Theme,
+    Theme,
 };
 
 pub struct Markdown {
@@ -33,11 +40,8 @@ fn parse<'a>(
     theme: Option<&Theme>,
     loader: &syntax::Loader,
 ) -> tui::text::Text<'a> {
-    use pulldown_cmark::{CodeBlockKind, CowStr, Event, Options, Parser, Tag};
-    use tui::text::{Span, Spans, Text};
-
-    // also 2021-03-04T16:33:58.553 helix_lsp::transport [INFO] <- {"contents":{"kind":"markdown","value":"\n```rust\ncore::num\n```\n\n```rust\npub const fn saturating_sub(self, rhs:Self) ->Self\n```\n\n---\n\n```rust\n```"},"range":{"end":{"character":61,"line":101},"start":{"character":47,"line":101}}}
-    let text = "\n```rust\ncore::iter::traits::iterator::Iterator\n```\n\n```rust\nfn collect<B: FromIterator<Self::Item>>(self) -> B\nwhere\n        Self: Sized,\n```\n\n---\n\nTransforms an iterator into a collection.\n\n`collect()` can take anything iterable, and turn it into a relevant\ncollection. This is one of the more powerful methods in the standard\nlibrary, used in a variety of contexts.\n\nThe most basic pattern in which `collect()` is used is to turn one\ncollection into another. You take a collection, call [`iter`](https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html) on it,\ndo a bunch of transformations, and then `collect()` at the end.\n\n`collect()` can also create instances of types that are not typical\ncollections. For example, a [`String`](https://doc.rust-lang.org/nightly/core/iter/std/string/struct.String.html) can be built from [`char`](type@char)s,\nand an iterator of [`Result<T, E>`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html) items can be collected\ninto `Result<Collection<T>, E>`. See the examples below for more.\n\nBecause `collect()` is so general, it can cause problems with type\ninference. As such, `collect()` is one of the few times you'll see\nthe syntax affectionately known as the 'turbofish': `::<>`. This\nhelps the inference algorithm understand specifically which collection\nyou're trying to collect into.\n\n# Examples\n\nBasic usage:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled: Vec<i32> = a.iter()\n                         .map(|&x| x * 2)\n                         .collect();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nNote that we needed the `: Vec<i32>` on the left-hand side. This is because\nwe could collect into, for example, a [`VecDeque<T>`](https://doc.rust-lang.org/nightly/core/iter/std/collections/struct.VecDeque.html) instead:\n\n```rust\nuse std::collections::VecDeque;\n\nlet a = [1, 2, 3];\n\nlet doubled: VecDeque<i32> = a.iter().map(|&x| x * 2).collect();\n\nassert_eq!(2, doubled[0]);\nassert_eq!(4, doubled[1]);\nassert_eq!(6, doubled[2]);\n```\n\nUsing the 'turbofish' instead of annotating `doubled`:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled = a.iter().map(|x| x * 2).collect::<Vec<i32>>();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nBecause `collect()` only cares about what you're collecting into, you can\nstill use a partial type hint, `_`, with the turbofish:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled = a.iter().map(|x| x * 2).collect::<Vec<_>>();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nUsing `collect()` to make a [`String`](https://doc.rust-lang.org/nightly/core/iter/std/string/struct.String.html):\n\n```rust\nlet chars = ['g', 'd', 'k', 'k', 'n'];\n\nlet hello: String = chars.iter()\n    .map(|&x| x as u8)\n    .map(|x| (x + 1) as char)\n    .collect();\n\nassert_eq!(\"hello\", hello);\n```\n\nIf you have a list of [`Result<T, E>`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html)s, you can use `collect()` to\nsee if any of them failed:\n\n```rust\nlet results = [Ok(1), Err(\"nope\"), Ok(3), Err(\"bad\")];\n\nlet result: Result<Vec<_>, &str> = results.iter().cloned().collect();\n\n// gives us the first error\nassert_eq!(Err(\"nope\"), result);\n\nlet results = [Ok(1), Ok(3)];\n\nlet result: Result<Vec<_>, &str> = results.iter().cloned().collect();\n\n// gives us the list of answers\nassert_eq!(Ok(vec![1, 3]), result);\n```";
+    // // also 2021-03-04T16:33:58.553 helix_lsp::transport [INFO] <- {"contents":{"kind":"markdown","value":"\n```rust\ncore::num\n```\n\n```rust\npub const fn saturating_sub(self, rhs:Self) ->Self\n```\n\n---\n\n```rust\n```"},"range":{"end":{"character":61,"line":101},"start":{"character":47,"line":101}}}
+    // let text = "\n```rust\ncore::iter::traits::iterator::Iterator\n```\n\n```rust\nfn collect<B: FromIterator<Self::Item>>(self) -> B\nwhere\n        Self: Sized,\n```\n\n---\n\nTransforms an iterator into a collection.\n\n`collect()` can take anything iterable, and turn it into a relevant\ncollection. This is one of the more powerful methods in the standard\nlibrary, used in a variety of contexts.\n\nThe most basic pattern in which `collect()` is used is to turn one\ncollection into another. You take a collection, call [`iter`](https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html) on it,\ndo a bunch of transformations, and then `collect()` at the end.\n\n`collect()` can also create instances of types that are not typical\ncollections. For example, a [`String`](https://doc.rust-lang.org/nightly/core/iter/std/string/struct.String.html) can be built from [`char`](type@char)s,\nand an iterator of [`Result<T, E>`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html) items can be collected\ninto `Result<Collection<T>, E>`. See the examples below for more.\n\nBecause `collect()` is so general, it can cause problems with type\ninference. As such, `collect()` is one of the few times you'll see\nthe syntax affectionately known as the 'turbofish': `::<>`. This\nhelps the inference algorithm understand specifically which collection\nyou're trying to collect into.\n\n# Examples\n\nBasic usage:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled: Vec<i32> = a.iter()\n                         .map(|&x| x * 2)\n                         .collect();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nNote that we needed the `: Vec<i32>` on the left-hand side. This is because\nwe could collect into, for example, a [`VecDeque<T>`](https://doc.rust-lang.org/nightly/core/iter/std/collections/struct.VecDeque.html) instead:\n\n```rust\nuse std::collections::VecDeque;\n\nlet a = [1, 2, 3];\n\nlet doubled: VecDeque<i32> = a.iter().map(|&x| x * 2).collect();\n\nassert_eq!(2, doubled[0]);\nassert_eq!(4, doubled[1]);\nassert_eq!(6, doubled[2]);\n```\n\nUsing the 'turbofish' instead of annotating `doubled`:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled = a.iter().map(|x| x * 2).collect::<Vec<i32>>();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nBecause `collect()` only cares about what you're collecting into, you can\nstill use a partial type hint, `_`, with the turbofish:\n\n```rust\nlet a = [1, 2, 3];\n\nlet doubled = a.iter().map(|x| x * 2).collect::<Vec<_>>();\n\nassert_eq!(vec![2, 4, 6], doubled);\n```\n\nUsing `collect()` to make a [`String`](https://doc.rust-lang.org/nightly/core/iter/std/string/struct.String.html):\n\n```rust\nlet chars = ['g', 'd', 'k', 'k', 'n'];\n\nlet hello: String = chars.iter()\n    .map(|&x| x as u8)\n    .map(|x| (x + 1) as char)\n    .collect();\n\nassert_eq!(\"hello\", hello);\n```\n\nIf you have a list of [`Result<T, E>`](https://doc.rust-lang.org/nightly/core/result/enum.Result.html)s, you can use `collect()` to\nsee if any of them failed:\n\n```rust\nlet results = [Ok(1), Err(\"nope\"), Ok(3), Err(\"bad\")];\n\nlet result: Result<Vec<_>, &str> = results.iter().cloned().collect();\n\n// gives us the first error\nassert_eq!(Err(\"nope\"), result);\n\nlet results = [Ok(1), Ok(3)];\n\nlet result: Result<Vec<_>, &str> = results.iter().cloned().collect();\n\n// gives us the list of answers\nassert_eq!(Ok(vec![1, 3]), result);\n```";
 
     let mut options = Options::empty();
     options.insert(Options::ENABLE_STRIKETHROUGH);
@@ -82,16 +86,13 @@ fn parse<'a>(
                 // TODO: temp workaround
                 if let Some(Tag::CodeBlock(CodeBlockKind::Fenced(language))) = tags.last() {
                     if let Some(theme) = theme {
-                        use helix_core::syntax::{self, HighlightEvent, Syntax};
-                        use helix_core::Rope;
-
                         let rope = Rope::from(text.as_ref());
                         let syntax = loader
                             .language_config_for_scope(&format!("source.{}", language))
                             .and_then(|config| config.highlight_config(theme.scopes()))
                             .map(|config| Syntax::new(&rope, config));
 
-                        if let Some(mut syntax) = syntax {
+                        if let Some(syntax) = syntax {
                             // if we have a syntax available, highlight_iter and generate spans
                             let mut highlights = Vec::new();
 
@@ -141,13 +142,13 @@ fn parse<'a>(
                             }
                         } else {
                             for line in text.lines() {
-                                let mut span = Span::styled(line.to_string(), code_style);
+                                let span = Span::styled(line.to_string(), code_style);
                                 lines.push(Spans::from(span));
                             }
                         }
                     } else {
                         for line in text.lines() {
-                            let mut span = Span::styled(line.to_string(), code_style);
+                            let span = Span::styled(line.to_string(), code_style);
                             lines.push(Spans::from(span));
                         }
                     }
diff --git a/helix-term/src/ui/menu.rs b/helix-term/src/ui/menu.rs
index bf18b92b..226c1135 100644
--- a/helix-term/src/ui/menu.rs
+++ b/helix-term/src/ui/menu.rs
@@ -4,16 +4,10 @@ use tui::{buffer::Buffer as Surface, widgets::Table};
 
 pub use tui::widgets::{Cell, Row};
 
-use std::borrow::Cow;
-
 use fuzzy_matcher::skim::SkimMatcherV2 as Matcher;
 use fuzzy_matcher::FuzzyMatcher;
 
-use helix_core::Position;
-use helix_view::{
-    graphics::{Color, Rect, Style},
-    Editor,
-};
+use helix_view::{graphics::Rect, Editor};
 
 pub trait Item {
     // TODO: sort_text
@@ -64,7 +58,6 @@ impl<T: Item> Menu<T> {
     pub fn score(&mut self, pattern: &str) {
         // need to borrow via pattern match otherwise it complains about simultaneous borrow
         let Self {
-            ref mut options,
             ref mut matcher,
             ref mut matches,
             ..
@@ -297,7 +290,7 @@ impl<T: Item + 'static> Component for Menu<T> {
         //     )
         // }
 
-        for (i, option) in (scroll..(scroll + win_height).min(len)).enumerate() {
+        for (i, _) in (scroll..(scroll + win_height).min(len)).enumerate() {
             let is_marked = i >= scroll_line && i < scroll_line + scroll_height;
 
             if is_marked {
diff --git a/helix-term/src/ui/mod.rs b/helix-term/src/ui/mod.rs
index 2d4cf9cf..7111c968 100644
--- a/helix-term/src/ui/mod.rs
+++ b/helix-term/src/ui/mod.rs
@@ -20,12 +20,9 @@ pub use text::Text;
 
 use helix_core::regex::Regex;
 use helix_core::register::Registers;
-use helix_view::{
-    graphics::{Color, Modifier, Rect, Style},
-    Document, Editor, View,
-};
+use helix_view::{Document, Editor, View};
 
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 
 pub fn regex_prompt(
     cx: &mut crate::commands::Context,
@@ -38,7 +35,7 @@ pub fn regex_prompt(
 
     Prompt::new(
         prompt,
-        |input: &str| Vec::new(), // this is fine because Vec::new() doesn't allocate
+        |_input: &str| Vec::new(), // this is fine because Vec::new() doesn't allocate
         move |cx: &mut crate::compositor::Context, input: &str, event: PromptEvent| {
             match event {
                 PromptEvent::Abort => {
@@ -121,7 +118,7 @@ pub fn file_picker(root: PathBuf) -> Picker<PathBuf> {
                 .into()
         },
         move |editor: &mut Editor, path: &PathBuf, action| {
-            let document_id = editor
+            editor
                 .open(path.into(), action)
                 .expect("editor.open failed");
         },
@@ -133,8 +130,8 @@ pub mod completers {
     use fuzzy_matcher::skim::SkimMatcherV2 as Matcher;
     use fuzzy_matcher::FuzzyMatcher;
     use helix_view::theme;
+    use std::borrow::Cow;
     use std::cmp::Reverse;
-    use std::{borrow::Cow, sync::Arc};
 
     pub type Completer = fn(&str) -> Vec<Completion>;
 
@@ -154,7 +151,7 @@ pub mod completers {
 
         let mut matches: Vec<_> = names
             .into_iter()
-            .filter_map(|(range, name)| {
+            .filter_map(|(_range, name)| {
                 matcher.fuzzy_match(&name, input).map(|score| (name, score))
             })
             .collect();
@@ -208,7 +205,7 @@ pub mod completers {
         // Rust's filename handling is really annoying.
 
         use ignore::WalkBuilder;
-        use std::path::{Path, PathBuf};
+        use std::path::Path;
 
         let is_tilde = input.starts_with('~') && input.len() == 1;
         let path = helix_view::document::expand_tilde(Path::new(input));
@@ -229,7 +226,7 @@ pub mod completers {
             (path, file_name)
         };
 
-        let end = (input.len()..);
+        let end = input.len()..;
 
         let mut files: Vec<_> = WalkBuilder::new(dir.clone())
             .max_depth(Some(1))
@@ -242,7 +239,7 @@ pub mod completers {
                         return None;
                     }
 
-                    let is_dir = entry.file_type().map_or(false, |entry| entry.is_dir());
+                    //let is_dir = entry.file_type().map_or(false, |entry| entry.is_dir());
 
                     let path = entry.path();
                     let mut path = if is_tilde {
@@ -274,14 +271,14 @@ pub mod completers {
             // inefficient, but we need to calculate the scores, filter out None, then sort.
             let mut matches: Vec<_> = files
                 .into_iter()
-                .filter_map(|(range, file)| {
+                .filter_map(|(_range, file)| {
                     matcher
                         .fuzzy_match(&file, &file_name)
                         .map(|score| (file, score))
                 })
                 .collect();
 
-            let range = ((input.len().saturating_sub(file_name.len()))..);
+            let range = (input.len().saturating_sub(file_name.len()))..;
 
             matches.sort_unstable_by_key(|(_file, score)| Reverse(*score));
             files = matches
diff --git a/helix-term/src/ui/picker.rs b/helix-term/src/ui/picker.rs
index 15e6b062..d7fc9d86 100644
--- a/helix-term/src/ui/picker.rs
+++ b/helix-term/src/ui/picker.rs
@@ -43,8 +43,8 @@ impl<T> Picker<T> {
     ) -> Self {
         let prompt = Prompt::new(
             "".to_string(),
-            |pattern: &str| Vec::new(),
-            |editor: &mut Context, pattern: &str, event: PromptEvent| {
+            |_pattern: &str| Vec::new(),
+            |_editor: &mut Context, _pattern: &str, _event: PromptEvent| {
                 //
             },
         );
@@ -69,7 +69,6 @@ impl<T> Picker<T> {
     pub fn score(&mut self) {
         // need to borrow via pattern match otherwise it complains about simultaneous borrow
         let Self {
-            ref mut options,
             ref mut matcher,
             ref mut matches,
             ref filters,
diff --git a/helix-term/src/ui/popup.rs b/helix-term/src/ui/popup.rs
index af72735c..29ffb4ad 100644
--- a/helix-term/src/ui/popup.rs
+++ b/helix-term/src/ui/popup.rs
@@ -2,13 +2,8 @@ use crate::compositor::{Component, Compositor, Context, EventResult};
 use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
 use tui::buffer::Buffer as Surface;
 
-use std::borrow::Cow;
-
 use helix_core::Position;
-use helix_view::{
-    graphics::{Color, Rect, Style},
-    Editor,
-};
+use helix_view::graphics::Rect;
 
 // TODO: share logic with Menu, it's essentially Popup(render_fn), but render fn needs to return
 // a width/height hint. maybe Popup(Box<Component>)
@@ -57,7 +52,7 @@ impl<T: Component> Component for Popup<T> {
     fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
         let key = match event {
             Event::Key(event) => event,
-            Event::Resize(width, height) => {
+            Event::Resize(_, _) => {
                 // TODO: calculate inner area, call component's handle_event with that area
                 return EventResult::Ignored;
             }
@@ -99,7 +94,7 @@ impl<T: Component> Component for Popup<T> {
         // tab/enter/ctrl-k or whatever will confirm the selection/ ctrl-n/ctrl-p for scroll.
     }
 
-    fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
+    fn required_size(&mut self, _viewport: (u16, u16)) -> Option<(u16, u16)> {
         let (width, height) = self
             .contents
             .required_size((120, 26)) // max width, max height
@@ -135,7 +130,6 @@ impl<T: Component> Component for Popup<T> {
             rel_y += 1 // position below point
         }
 
-        let area = Rect::new(rel_x, rel_y, width, height);
         // clip to viewport
         let area = viewport.intersection(Rect::new(rel_x, rel_y, width, height));
 
diff --git a/helix-term/src/ui/prompt.rs b/helix-term/src/ui/prompt.rs
index 6bb1b006..a4cb26f7 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -5,13 +5,11 @@ use std::{borrow::Cow, ops::RangeFrom};
 use tui::buffer::Buffer as Surface;
 
 use helix_core::{
-    unicode::segmentation::{GraphemeCursor, GraphemeIncomplete},
-    unicode::width::UnicodeWidthStr,
-    Position,
+    unicode::segmentation::GraphemeCursor, unicode::width::UnicodeWidthStr, Position,
 };
 use helix_view::{
-    graphics::{Color, CursorKind, Margin, Modifier, Rect, Style},
-    Editor, Theme,
+    graphics::{CursorKind, Margin, Rect},
+    Editor,
 };
 
 pub type Completion = (RangeFrom<usize>, Cow<'static, str>);
@@ -399,6 +397,22 @@ impl Component for Prompt {
                 return close_fn;
             }
             KeyEvent {
+                code: KeyCode::Left,
+                modifiers: KeyModifiers::ALT,
+            }
+            | KeyEvent {
+                code: KeyCode::Char('b'),
+                modifiers: KeyModifiers::ALT,
+            } => self.move_cursor(Movement::BackwardWord(1)),
+            KeyEvent {
+                code: KeyCode::Right,
+                modifiers: KeyModifiers::ALT,
+            }
+            | KeyEvent {
+                code: KeyCode::Char('f'),
+                modifiers: KeyModifiers::ALT,
+            } => self.move_cursor(Movement::ForwardWord(1)),
+            KeyEvent {
                 code: KeyCode::Char('f'),
                 modifiers: KeyModifiers::CONTROL,
             }
@@ -431,22 +445,6 @@ impl Component for Prompt {
                 modifiers: KeyModifiers::CONTROL,
             } => self.move_start(),
             KeyEvent {
-                code: KeyCode::Left,
-                modifiers: KeyModifiers::ALT,
-            }
-            | KeyEvent {
-                code: KeyCode::Char('b'),
-                modifiers: KeyModifiers::ALT,
-            } => self.move_cursor(Movement::BackwardWord(1)),
-            KeyEvent {
-                code: KeyCode::Right,
-                modifiers: KeyModifiers::ALT,
-            }
-            | KeyEvent {
-                code: KeyCode::Char('f'),
-                modifiers: KeyModifiers::ALT,
-            } => self.move_cursor(Movement::ForwardWord(1)),
-            KeyEvent {
                 code: KeyCode::Char('w'),
                 modifiers: KeyModifiers::CONTROL,
             } => self.delete_word_backwards(),
@@ -494,7 +492,7 @@ impl Component for Prompt {
         self.render_prompt(area, surface, cx)
     }
 
-    fn cursor(&self, area: Rect, editor: &Editor) -> (Option<Position>, CursorKind) {
+    fn cursor(&self, area: Rect, _editor: &Editor) -> (Option<Position>, CursorKind) {
         let line = area.height as usize - 1;
         (
             Some(Position::new(
diff --git a/helix-term/src/ui/text.rs b/helix-term/src/ui/text.rs
index 7c491841..249cf89e 100644
--- a/helix-term/src/ui/text.rs
+++ b/helix-term/src/ui/text.rs
@@ -1,14 +1,7 @@
-use crate::compositor::{Component, Compositor, Context, EventResult};
-use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
+use crate::compositor::{Component, Context};
 use tui::buffer::Buffer as Surface;
 
-use std::borrow::Cow;
-
-use helix_core::Position;
-use helix_view::{
-    graphics::{Color, Rect, Style},
-    Editor,
-};
+use helix_view::graphics::Rect;
 
 pub struct Text {
     contents: String,
@@ -20,12 +13,10 @@ impl Text {
     }
 }
 impl Component for Text {
-    fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
+    fn render(&self, area: Rect, surface: &mut Surface, _cx: &mut Context) {
         use tui::widgets::{Paragraph, Widget, Wrap};
         let contents = tui::text::Text::from(self.contents.clone());
 
-        let style = cx.editor.theme.get("ui.text");
-
         let par = Paragraph::new(contents).wrap(Wrap { trim: false });
         // .scroll(x, y) offsets