Fix unused variable, parameter, and `mut` warnings in helix-term.

12 files changed, 112 insertions, 118 deletions

diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index 1939e88c..e75b0ecb 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -25,7 +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,
@@ -33,7 +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();
@@ -66,7 +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() {
@@ -91,7 +98,7 @@ impl Application {
 
         editor.set_theme(theme);
 
-        let mut app = Self {
+        let app = Self {
             compositor,
             editor,
 
@@ -357,14 +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,
diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index e3accaeb..8e5816e9 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -60,7 +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)
         }));
@@ -493,7 +493,7 @@ fn extend_next_word_start(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     let text = doc.text().slice(..);
 
-    let selection = doc.selection(view.id).transform(|mut range| {
+    let selection = doc.selection(view.id).transform(|range| {
         let word = movement::move_next_word_start(text, range, count);
         let pos = word.head;
         Range::new(range.anchor, pos)
@@ -507,7 +507,7 @@ fn extend_prev_word_start(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     let text = doc.text().slice(..);
 
-    let selection = doc.selection(view.id).transform(|mut range| {
+    let selection = doc.selection(view.id).transform(|range| {
         let word = movement::move_prev_word_start(text, range, count);
         let pos = word.head;
         Range::new(range.anchor, pos)
@@ -520,7 +520,7 @@ fn extend_next_word_end(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
     let text = doc.text().slice(..);
 
-    let selection = doc.selection(view.id).transform(|mut range| {
+    let selection = doc.selection(view.id).transform(|range| {
         let word = movement::move_next_word_end(text, range, count);
         let pos = word.head;
         Range::new(range.anchor, pos)
@@ -571,7 +571,7 @@ where
         let (view, doc) = current!(cx.editor);
         let text = doc.text().slice(..);
 
-        let selection = doc.selection(view.id).transform(|mut range| {
+        let selection = doc.selection(view.id).transform(|range| {
             search_fn(text, ch, range.head, count, inclusive).map_or(range, |pos| {
                 if extend {
                     Range::new(range.anchor, pos)
@@ -929,7 +929,7 @@ 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?
 
@@ -937,7 +937,6 @@ 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(),
@@ -989,7 +988,7 @@ 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);
@@ -1012,7 +1011,6 @@ fn delete_selection_impl(reg: &mut Register, doc: &mut Document, view_id: ViewId
     let transaction =
         Transaction::change_by_selection(doc.text(), doc.selection(view_id), |range| {
             let alltext = doc.text().slice(..);
-            let line = alltext.char_to_line(range.head);
             let max_to = rope_end_without_line_ending(&alltext);
             let to = std::cmp::min(max_to, range.to() + 1);
             (range.from(), to, None)
@@ -1119,7 +1117,7 @@ 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;
@@ -1128,12 +1126,12 @@ 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
@@ -1150,7 +1148,7 @@ mod cmd {
         path: Option<P>,
     ) -> Result<tokio::task::JoinHandle<Result<(), anyhow::Error>>, anyhow::Error> {
         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()) {
@@ -1174,7 +1172,7 @@ 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) => {
@@ -1184,11 +1182,11 @@ 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() {
@@ -1198,7 +1196,7 @@ 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.
@@ -1236,7 +1234,7 @@ 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.
@@ -1275,7 +1273,7 @@ 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) => {
@@ -1287,7 +1285,7 @@ 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) => {
@@ -1315,7 +1313,6 @@ 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) {
@@ -1357,15 +1354,15 @@ 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;
@@ -1399,7 +1396,7 @@ 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;
         }
@@ -1419,7 +1416,7 @@ 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 {
@@ -1430,11 +1427,15 @@ 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()
@@ -1443,15 +1444,19 @@ 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() {
@@ -1470,12 +1475,12 @@ 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 => {
@@ -1503,7 +1508,7 @@ 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
@@ -1836,7 +1841,7 @@ 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,
@@ -1927,7 +1932,7 @@ 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 {
@@ -2101,9 +2106,6 @@ 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);
@@ -2152,7 +2154,7 @@ 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
@@ -2174,7 +2176,7 @@ 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();
@@ -2341,9 +2343,8 @@ 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 {
@@ -2355,9 +2356,8 @@ 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 {
@@ -2429,8 +2429,8 @@ 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);
@@ -3002,8 +3002,10 @@ 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,
         };
@@ -3051,7 +3053,7 @@ 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);
 
@@ -3227,7 +3229,7 @@ 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));
             }
         },
@@ -3271,7 +3273,7 @@ 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;
@@ -3480,10 +3482,7 @@ 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),
                 _ => (),
             }
         }
@@ -3505,9 +3504,8 @@ 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() {
                 let from = range.from();
-                let line = text.char_to_line(range.to());
                 let max_to = rope_end_without_line_ending(&text);
                 let to = std::cmp::min(range.to() + 1, max_to);
 
diff --git a/helix-term/src/compositor.rs b/helix-term/src/compositor.rs
index 46da04be..c3d6dee0 100644
--- a/helix-term/src/compositor.rs
+++ b/helix-term/src/compositor.rs
@@ -35,7 +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: ()
@@ -49,13 +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
@@ -79,7 +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,
@@ -124,8 +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");
 
diff --git a/helix-term/src/ui/completion.rs b/helix-term/src/ui/completion.rs
index 5b418f75..be6db42c 100644
--- a/helix-term/src/ui/completion.rs
+++ b/helix-term/src/ui/completion.rs
@@ -76,7 +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 => {
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index 70f81af9..14c34493 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -392,7 +392,7 @@ impl EditorView {
         viewport: Rect,
         surface: &mut Surface,
         theme: &Theme,
-        is_focused: bool,
+        _is_focused: bool,
     ) {
         use helix_core::diagnostic::Severity;
         use tui::{
@@ -402,7 +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
@@ -608,7 +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 {
@@ -705,7 +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"));
 
@@ -741,7 +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 a1f1e5ea..6c79ca67 100644
--- a/helix-term/src/ui/markdown.rs
+++ b/helix-term/src/ui/markdown.rs
@@ -40,8 +40,8 @@ fn parse<'a>(
     theme: Option<&Theme>,
     loader: &syntax::Loader,
 ) -> tui::text::Text<'a> {
-    // 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);
@@ -92,7 +92,7 @@ fn parse<'a>(
                             .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();
 
@@ -142,13 +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 cb8b6723..226c1135 100644
--- a/helix-term/src/ui/menu.rs
+++ b/helix-term/src/ui/menu.rs
@@ -58,7 +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,
             ..
@@ -291,7 +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 86ec7615..7111c968 100644
--- a/helix-term/src/ui/mod.rs
+++ b/helix-term/src/ui/mod.rs
@@ -35,7 +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 => {
@@ -118,7 +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");
         },
@@ -151,7 +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();
@@ -226,7 +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))
@@ -239,7 +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 {
@@ -271,14 +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 fc178af0..29ffb4ad 100644
--- a/helix-term/src/ui/popup.rs
+++ b/helix-term/src/ui/popup.rs
@@ -52,7 +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;
             }
@@ -94,7 +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
@@ -130,7 +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 f7c3c685..a4cb26f7 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -397,6 +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,
             }
@@ -429,22 +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(),
@@ -492,7 +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 0d7cd0ed..249cf89e 100644
--- a/helix-term/src/ui/text.rs
+++ b/helix-term/src/ui/text.rs
@@ -13,12 +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