Configurable keys 2 (Mapping keys to commands) (#268)

* Add convenience/clarity wrapper for Range initialization

* Add keycode parse and display methods

* Add remapping functions and tests

* Implement key remapping

* Add remapping book entry

* Use raw string literal for toml

* Add command constants

* Make command functions private

* Map directly to commands

* Match key parsing/displaying to Kakoune

* Formatting pass

* Update documentation

* Formatting

* Fix example in the book

* Refactor into single config file

* Formatting

* Refactor configuration and add keymap newtype wrappers

* Address first batch of PR comments

* Replace FromStr with custom deserialize

book/src/SUMMARY.md

@@ -4,4 +4,5 @@
 - [Usage](./usage.md)
 - [Configuration](./configuration.md)
   - [Keymap](./keymap.md)
+  - [Key Remapping](./remapping.md)
   - [Hooks](./hooks.md)

book/src/remapping.md

@@ -0,0 +1,48 @@
+# Key Remapping
+
+One-way key remapping is temporarily supported via a simple TOML configuration
+file. (More powerful solutions such as rebinding via commands will be
+available in the feature).
+
+To remap keys, write a `config.toml` file in your `helix` configuration
+directory (default `~/.config/helix` in Linux systems) with a structure like
+this:
+
+```toml
+# At most one section each of 'keys.normal', 'keys.insert' and 'keys.select'
+[keys.normal]
+a = "move_char_left" # Maps the 'a' key to the move_char_left command
+w = "move_line_up" # Maps the 'w' key move_line_up
+C-S-esc = "select_line" # Maps Control-Shift-Escape to select_line
+
+[keys.insert]
+A-x = "normal_mode" # Maps Alt-X to enter normal mode
+```
+
+Control, Shift and Alt modifiers are encoded respectively with the prefixes
+`C-`, `S-` and `A-`. Special keys are encoded as follows:
+
+* Backspace => "backspace"
+* Space => "space"
+* Return/Enter => "ret"
+* < => "lt"
+* > => "gt"
+* + => "plus"
+* - => "minus"
+* ; => "semicolon"
+* % => "percent"
+* Left => "left"
+* Right => "right"
+* Up => "up"
+* Home => "home"
+* End => "end"
+* Page Up => "pageup"
+* Page Down => "pagedown"
+* Tab => "tab"
+* Back Tab => "backtab"
+* Delete => "del"
+* Insert => "ins"
+* Null => "null"
+* Escape => "esc"
+
+Commands can be found in the source code at `../../helix-term/src/commands.rs`

helix-term/src/application.rs

@@ -1,7 +1,7 @@
 use helix_lsp::lsp;
 use helix_view::{document::Mode, Document, Editor, Theme, View};
 
-use crate::{args::Args, compositor::Compositor, ui};
+use crate::{args::Args, compositor::Compositor, config::Config, keymap::Keymaps, ui};
 
 use log::{error, info};
 
@@ -40,13 +40,14 @@ pub struct Application {
 }
 
 impl Application {
-    pub fn new(mut args: Args) -> Result<Self, Error> {
+    pub fn new(mut args: Args, config: Config) -> Result<Self, Error> {
         use helix_view::editor::Action;
         let mut compositor = Compositor::new()?;
         let size = compositor.size();
         let mut editor = Editor::new(size);
 
-        compositor.push(Box::new(ui::EditorView::new()));
+        let mut editor_view = Box::new(ui::EditorView::new(config.keymaps));
+        compositor.push(editor_view);
 
         if !args.files.is_empty() {
             let first = &args.files[0]; // we know it's not empty