Split parts of helix-term into helix-view.

It still largely depends on term for some types but I plan to change
that later.

15 files changed, 250 insertions, 118 deletions

diff --git a/Cargo.lock b/Cargo.lock
index f9b52d7d..f37c951c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -410,13 +410,23 @@ dependencies = [
  "argh",
  "crossterm",
  "helix-core",
- "helix-syntax",
+ "helix-view",
  "num_cpus",
  "smol",
  "tui",
 ]
 
 [[package]]
+name = "helix-view"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "crossterm",
+ "helix-core",
+ "tui",
+]
+
+[[package]]
 name = "hermit-abi"
 version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index db3530c9..25dbe725 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,7 @@
 [workspace]
 members = [
   "helix-core",
+  "helix-view",
   "helix-term",
   "helix-syntax",
 ]
diff --git a/README.md b/README.md
index 325ff522..3a0ac317 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,12 @@
+# Helix
+
+| Crate        | Description                                            |
+| -----------  | -----------                                            |
+| helix-core   | Core editing primitives, functional.                   |
+| helix-syntax | Tree-sitter grammars                                   |
+| helix-view   | UI abstractions for use in backends, imperative shell. |
+| helix-term   | Terminal UI                                            |
+
 - server-client architecture via gRPC, UI separate from core
 - multi cursor based editing and slicing
 - WASM based plugins (builtin LSP & fuzzy file finder)
diff --git a/helix-core/src/lib.rs b/helix-core/src/lib.rs
index c617fdbf..e443168e 100644
--- a/helix-core/src/lib.rs
+++ b/helix-core/src/lib.rs
@@ -1,5 +1,7 @@
 #![allow(unused)]
+pub mod config;
 pub mod graphemes;
+pub mod macros;
 mod position;
 mod selection;
 pub mod state;
diff --git a/helix-term/src/macros.rs b/helix-core/src/macros.rs
index 3b22a786..1321ea5f 100644
--- a/helix-term/src/macros.rs
+++ b/helix-core/src/macros.rs
@@ -1,3 +1,4 @@
+#[macro_export]
 macro_rules! hashmap {
     (@single $($x:tt)*) => (());
     (@count $($rest:expr),*) => (<[()]>::len(&[$(hashmap!(@single $rest)),*]));
diff --git a/helix-core/src/state.rs b/helix-core/src/state.rs
index 5b5f06c0..79e15eff 100644
--- a/helix-core/src/state.rs
+++ b/helix-core/src/state.rs
@@ -4,7 +4,7 @@ use anyhow::Error;
 
 use std::path::PathBuf;
 
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
 pub enum Mode {
     Normal,
     Insert,
diff --git a/helix-term/Cargo.toml b/helix-term/Cargo.toml
index e0b96ead..d32fc0b9 100644
--- a/helix-term/Cargo.toml
+++ b/helix-term/Cargo.toml
@@ -12,12 +12,12 @@ path = "src/main.rs"
 
 [dependencies]
 helix-core = { path = "../helix-core" }
-helix-syntax = { path = "../helix-syntax" }
+helix-view = { path = "../helix-view", features = ["term"]}
 
 anyhow = "1"
 argh = "0.1.3"
-crossterm = { version = "0.17", features = ["event-stream"] }
 
 smol = "1"
 num_cpus = "1.13.0"
 tui = { version = "0.10.0", default-features = false, features = ["crossterm"] }
+crossterm = { version = "0.17", features = ["event-stream"] }
diff --git a/helix-term/src/editor.rs b/helix-term/src/editor.rs
index 0542d217..e29e7ee8 100644
--- a/helix-term/src/editor.rs
+++ b/helix-term/src/editor.rs
@@ -1,10 +1,11 @@
-use crate::{commands, keymap, theme::Theme, Args};
+use crate::Args;
 use helix_core::{
     state::coords_at_pos,
     state::Mode,
     syntax::{HighlightConfiguration, HighlightEvent, Highlighter},
     State,
 };
+use helix_view::{commands, keymap, View};
 
 use std::{
     io::{self, stdout, Write},
@@ -31,19 +32,12 @@ type Terminal = tui::Terminal<CrosstermBackend<std::io::Stdout>>;
 
 static EX: smol::Executor = smol::Executor::new();
 
-pub struct View {
-    pub state: State,
-    pub first_line: u16,
-    pub size: (u16, u16),
-}
-
 pub struct Editor {
     terminal: Terminal,
     view: Option<View>,
     size: (u16, u16),
     surface: Surface,
     cache: Surface,
-    theme: Theme,
 }
 
 impl Editor {
@@ -53,7 +47,6 @@ impl Editor {
         let mut terminal = Terminal::new(backend)?;
         let size = terminal::size().unwrap();
         let area = Rect::new(0, 0, size.0, size.1);
-        let theme = Theme::default();
 
         let mut editor = Editor {
             terminal,
@@ -61,7 +54,6 @@ impl Editor {
             size,
             surface: Surface::empty(area),
             cache: Surface::empty(area),
-            theme,
             // TODO; move to state
         };
 
@@ -73,20 +65,7 @@ impl Editor {
     }
 
     pub fn open(&mut self, path: PathBuf) -> Result<(), Error> {
-        let mut state = State::load(path)?;
-        state
-            .syntax
-            .as_mut()
-            .unwrap()
-            .configure(self.theme.scopes());
-
-        let view = View {
-            state,
-            first_line: 0,
-            size: self.size,
-        };
-
-        self.view = Some(view);
+        self.view = Some(View::open(path, self.size)?);
         Ok(())
     }
 
@@ -102,7 +81,7 @@ impl Editor {
 
                 //  clear with background color
                 self.surface
-                    .set_style(area, self.theme.get("ui.background"));
+                    .set_style(area, view.theme.get("ui.background").into());
 
                 let offset = 5 + 1; // 5 linenr + 1 gutter
                 let viewport = Rect::new(offset, 0, self.size.0, self.size.1 - 1); // - 1 for statusline
@@ -161,7 +140,9 @@ impl Editor {
                             use helix_core::graphemes::{grapheme_width, RopeGraphemes};
 
                             let style = match spans.first() {
-                                Some(span) => self.theme.get(self.theme.scopes()[span.0].as_str()),
+                                Some(span) => {
+                                    view.theme.get(view.theme.scopes()[span.0].as_str()).into()
+                                }
                                 None => Style::default().fg(Color::Rgb(164, 160, 232)), // lavender
                             };
 
@@ -202,7 +183,7 @@ impl Editor {
                 }
 
                 let mut line = 0;
-                let style = self.theme.get("ui.linenr");
+                let style: Style = view.theme.get("ui.linenr").into();
                 for i in view.first_line..(last_line as u16) {
                     self.surface
                         .set_stringn(0, line, format!("{:>5}", i + 1), 5, style); // lavender
@@ -241,7 +222,7 @@ impl Editor {
                 };
                 self.surface.set_style(
                     Rect::new(0, self.size.1 - 1, self.size.0, 1),
-                    self.theme.get("ui.statusline"),
+                    view.theme.get("ui.statusline").into(),
                 );
                 // TODO: unfocused one with different color
                 let text_color = Style::default().fg(Color::Rgb(219, 191, 239)); // lilac
@@ -296,7 +277,9 @@ impl Editor {
                     self.cache = Surface::empty(area);
 
                     // TODO: simplistic ensure cursor in view for now
-                    self.ensure_cursor_in_view();
+                    if let Some(view) = &mut self.view {
+                        view.ensure_cursor_in_view()
+                    };
 
                     self.render();
                 }
@@ -333,18 +316,19 @@ impl Editor {
                                     _ => (), // skip
                                 }
                                 // TODO: simplistic ensure cursor in view for now
-                                self.ensure_cursor_in_view();
+                                view.ensure_cursor_in_view();
 
                                 self.render();
                             }
                             Mode::Normal => {
                                 // TODO: handle modes and sequences (`gg`)
-                                if let Some(command) = keymap.get(&event) {
+                                let keys = vec![event];
+                                if let Some(command) = keymap[&Mode::Normal].get(&keys) {
                                     // TODO: handle count other than 1
                                     command(view, 1);
 
                                     // TODO: simplistic ensure cursor in view for now
-                                    self.ensure_cursor_in_view();
+                                    view.ensure_cursor_in_view();
 
                                     self.render();
                                 }
@@ -361,26 +345,6 @@ impl Editor {
         }
     }
 
-    fn ensure_cursor_in_view(&mut self) {
-        if let Some(view) = &mut self.view {
-            let cursor = view.state.selection().cursor();
-            let line = view.state.doc().char_to_line(cursor) as u16;
-            let document_end = view.first_line + self.size.1.saturating_sub(1) - 1;
-
-            let padding = 5u16;
-
-            // TODO: side scroll
-
-            if line > document_end.saturating_sub(padding) {
-                // scroll down
-                view.first_line += line - (document_end.saturating_sub(padding));
-            } else if line < view.first_line + padding {
-                // scroll up
-                view.first_line = line.saturating_sub(padding);
-            }
-        }
-    }
-
     pub async fn run(&mut self) -> Result<(), Error> {
         enable_raw_mode()?;
 
diff --git a/helix-term/src/main.rs b/helix-term/src/main.rs
index aca04641..b691eb65 100644
--- a/helix-term/src/main.rs
+++ b/helix-term/src/main.rs
@@ -1,11 +1,6 @@
 #![allow(unused)]
-#[macro_use]
-mod macros;
 
-mod commands;
 mod editor;
-mod keymap;
-mod theme;
 
 use editor::Editor;
 
diff --git a/helix-view/Cargo.toml b/helix-view/Cargo.toml
new file mode 100644
index 00000000..37957625
--- /dev/null
+++ b/helix-view/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "helix-view"
+version = "0.1.0"
+authors = ["Blaž Hrastnik <blaz@mxxn.io>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+term = ["tui", "crossterm"]
+
+[dependencies]
+anyhow = "1.0.32"
+helix-core = { path = "../helix-core" }
+
+# Conversion traits
+tui = { version = "0.10.0", default-features = false, features = ["crossterm"], optional = true}
+crossterm = { version = "0.17", features = ["event-stream"], optional = true}
diff --git a/helix-term/src/commands.rs b/helix-view/src/commands.rs
index 269a7743..560167c9 100644
--- a/helix-term/src/commands.rs
+++ b/helix-view/src/commands.rs
@@ -1,10 +1,10 @@
 use helix_core::{
     graphemes,
     state::{Direction, Granularity, Mode, State},
-    ChangeSet, Range, Selection, Tendril, Transaction,
+    Range, Selection, Tendril, Transaction,
 };
 
-use crate::editor::View;
+use crate::view::View;
 
 /// A command is a function that takes the current state and a count, and does a side-effect on the
 /// state (usually by creating and applying a transaction).
diff --git a/helix-term/src/keymap.rs b/helix-view/src/keymap.rs
index d52ccca4..705357a8 100644
--- a/helix-term/src/keymap.rs
+++ b/helix-view/src/keymap.rs
@@ -1,9 +1,5 @@
 use crate::commands::{self, Command};
-use crossterm::{
-    event::{KeyCode, KeyEvent as Key, KeyModifiers as Modifiers},
-    execute,
-    style::Print,
-};
+use helix_core::{hashmap, state};
 use std::collections::HashMap;
 
 // Kakoune-inspired:
@@ -79,56 +75,57 @@ use std::collections::HashMap;
 //      }
 // }
 
-type Keymap = HashMap<Key, Command>;
+#[cfg(feature = "term")]
+pub use crossterm::event::{KeyCode, KeyEvent as Key, KeyModifiers as Modifiers};
 
-pub fn default() -> Keymap {
+// TODO: could be trie based
+type Keymap = HashMap<Vec<Key>, Command>;
+type Keymaps = HashMap<state::Mode, Keymap>;
+
+pub fn default() -> Keymaps {
     hashmap!(
-        Key {
-            code: KeyCode::Char('h'),
-            modifiers: Modifiers::NONE
-        } => commands::move_char_left as Command,
-        Key {
-            code: KeyCode::Char('j'),
-            modifiers: Modifiers::NONE
-        } => commands::move_line_down as Command,
-        Key {
-            code: KeyCode::Char('k'),
-            modifiers: Modifiers::NONE
-        } => commands::move_line_up as Command,
-        Key {
-            code: KeyCode::Char('l'),
-            modifiers: Modifiers::NONE
-        } => commands::move_char_right as Command,
-        Key {
-            code: KeyCode::Char('i'),
-            modifiers: Modifiers::NONE
-        } => commands::insert_mode as Command,
-        Key {
-            code: KeyCode::Char('I'),
-            modifiers: Modifiers::SHIFT,
-        } => commands::prepend_to_line as Command,
-        Key {
-            code: KeyCode::Char('a'),
-            modifiers: Modifiers::NONE
-        } => commands::append_mode as Command,
-        Key {
-            code: KeyCode::Char('A'),
-            modifiers: Modifiers::SHIFT,
-        } => commands::append_to_line as Command,
-        Key {
-            code: KeyCode::Char('o'),
-            modifiers: Modifiers::NONE
-        } => commands::open_below as Command,
-        Key {
-            code: KeyCode::Esc,
-            modifiers: Modifiers::NONE
-        } => commands::normal_mode as Command,
+        state::Mode::Normal =>
+            hashmap!(
+                vec![Key {
+                    code: KeyCode::Char('h'),
+                    modifiers: Modifiers::NONE
+                }] => commands::move_char_left as Command,
+                vec![Key {
+                    code: KeyCode::Char('j'),
+                    modifiers: Modifiers::NONE
+                }] => commands::move_line_down as Command,
+                vec![Key {
+                    code: KeyCode::Char('k'),
+                    modifiers: Modifiers::NONE
+                }] => commands::move_line_up as Command,
+                vec![Key {
+                    code: KeyCode::Char('l'),
+                    modifiers: Modifiers::NONE
+                }] => commands::move_char_right as Command,
+                vec![Key {
+                    code: KeyCode::Char('i'),
+                    modifiers: Modifiers::NONE
+                }] => commands::insert_mode as Command,
+                vec![Key {
+                    code: KeyCode::Char('I'),
+                    modifiers: Modifiers::SHIFT,
+                }] => commands::prepend_to_line as Command,
+                vec![Key {
+                    code: KeyCode::Char('a'),
+                    modifiers: Modifiers::NONE
+                }] => commands::append_mode as Command,
+                vec![Key {
+                    code: KeyCode::Char('A'),
+                    modifiers: Modifiers::SHIFT,
+                }] => commands::append_to_line as Command,
+                vec![Key {
+                    code: KeyCode::Char('o'),
+                    modifiers: Modifiers::NONE
+                }] => commands::open_below as Command,
+                vec![Key {
+                    code: KeyCode::Esc,
+                    modifiers: Modifiers::NONE
+                }] => commands::normal_mode as Command,
+            )
     )
-
-    // hashmap!(
-    //     Key {
-    //         code: KeyCode::Esc,
-    //         modifiers: Modifiers::NONE
-    //     } => commands::normal_mode as Command,
-    // )
 }
diff --git a/helix-view/src/lib.rs b/helix-view/src/lib.rs
new file mode 100644
index 00000000..2a000f32
--- /dev/null
+++ b/helix-view/src/lib.rs
@@ -0,0 +1,6 @@
+pub mod commands;
+pub mod keymap;
+pub mod theme;
+pub mod view;
+
+pub use view::View;
diff --git a/helix-term/src/theme.rs b/helix-view/src/theme.rs
index 4b2f102e..d61457d7 100644
--- a/helix-term/src/theme.rs
+++ b/helix-view/src/theme.rs
@@ -1,5 +1,86 @@
+use helix_core::hashmap;
 use std::collections::HashMap;
-use tui::style::{Color, Style};
+
+#[cfg(feature = "term")]
+pub use tui::style::{Color, Style};
+
+// #[derive(Clone, Copy, PartialEq, Eq, Default, Hash)]
+// pub struct Color {
+//     pub r: u8,
+//     pub g: u8,
+//     pub b: u8,
+// }
+
+// impl Color {
+//     pub fn new(r: u8, g: u8, b: u8) -> Self {
+//         Self { r, g, b }
+//     }
+// }
+
+// #[cfg(feature = "term")]
+// impl Into<tui::style::Color> for Color {
+//     fn into(self) -> tui::style::Color {
+//         tui::style::Color::Rgb(self.r, self.g, self.b)
+//     }
+// }
+
+// impl std::str::FromStr for Color {
+//     type Err = ();
+
+//     /// Tries to parse a string (`'#FFFFFF'` or `'FFFFFF'`) into RGB.
+//     fn from_str(input: &str) -> Result<Self, Self::Err> {
+//         let input = input.trim();
+//         let input = match (input.chars().next(), input.len()) {
+//             (Some('#'), 7) => &input[1..],
+//             (_, 6) => input,
+//             _ => return Err(()),
+//         };
+
+//         u32::from_str_radix(&input, 16)
+//             .map(|s| Color {
+//                 r: ((s >> 16) & 0xFF) as u8,
+//                 g: ((s >> 8) & 0xFF) as u8,
+//                 b: (s & 0xFF) as u8,
+//             })
+//             .map_err(|_| ())
+//     }
+// }
+
+// #[derive(Clone, Copy, PartialEq, Eq, Default, Hash)]
+// pub struct Style {
+//     pub fg: Option<Color>,
+//     pub bg: Option<Color>,
+//     // TODO: modifiers (bold, underline, italic, etc)
+// }
+
+// impl Style {
+//     pub fn fg(mut self, fg: Color) -> Self {
+//         self.fg = Some(fg);
+//         self
+//     }
+
+//     pub fn bg(mut self, bg: Color) -> Self {
+//         self.bg = Some(bg);
+//         self
+//     }
+// }
+
+// #[cfg(feature = "term")]
+// impl Into<tui::style::Style> for Style {
+//     fn into(self) -> tui::style::Style {
+//         let style = tui::style::Style::default();
+
+//         if let Some(fg) = self.fg {
+//             style.fg(fg.into());
+//         }
+
+//         if let Some(bg) = self.bg {
+//             style.bg(bg.into());
+//         }
+
+//         style
+//     }
+// }
 
 /// Color theme for syntax highlighting.
 pub struct Theme {
diff --git a/helix-view/src/view.rs b/helix-view/src/view.rs
new file mode 100644
index 00000000..3f7a9974
--- /dev/null
+++ b/helix-view/src/view.rs
@@ -0,0 +1,48 @@
+use anyhow::Error;
+
+use std::path::PathBuf;
+
+use crate::theme::Theme;
+use helix_core::State;
+
+pub struct View {
+    pub state: State,
+    pub first_line: u16,
+    pub size: (u16, u16),
+    pub theme: Theme, // TODO: share one instance
+}
+
+impl View {
+    pub fn open(path: PathBuf, size: (u16, u16)) -> Result<View, Error> {
+        let mut state = State::load(path)?;
+        let theme = Theme::default();
+        state.syntax.as_mut().unwrap().configure(theme.scopes());
+
+        let view = View {
+            state,
+            first_line: 0,
+            size, // TODO: pass in from term
+            theme,
+        };
+
+        Ok(view)
+    }
+
+    pub fn ensure_cursor_in_view(&mut self) {
+        let cursor = self.state.selection().cursor();
+        let line = self.state.doc().char_to_line(cursor) as u16;
+        let document_end = self.first_line + self.size.1.saturating_sub(1) - 1;
+
+        let padding = 5u16;
+
+        // TODO: side scroll
+
+        if line > document_end.saturating_sub(padding) {
+            // scroll down
+            self.first_line += line - (document_end.saturating_sub(padding));
+        } else if line < self.first_line + padding {
+            // scroll up
+            self.first_line = line.saturating_sub(padding);
+        }
+    }
+}