Macros (#1234)

* Macros WIP

`helix_term::compositor::Callback` changed to take a `&mut Context` as
a parameter for use by `play_macro`

* Default to `@` register for macros

* Import `KeyEvent`

* Special-case shift-tab -> backtab in `KeyEvent` conversion

* Move key recording to the compositor

* Add comment

* Add persistent display of macro recording status

When macro recording is active, the pending keys display will be shifted
3 characters left, and the register being recorded to will be displayed
between brackets — e.g., `[@]` — right of the pending keys display.

* Fix/add documentation

2 files changed, 23 insertions, 0 deletions

diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index 9034d12c..dcbcbe4f 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -2,6 +2,7 @@ use crate::{
     clipboard::{get_clipboard_provider, ClipboardProvider},
     document::SCRATCH_BUFFER_NAME,
     graphics::{CursorKind, Rect},
+    input::KeyEvent,
     theme::{self, Theme},
     tree::{self, Tree},
     Document, DocumentId, View, ViewId,
@@ -160,6 +161,7 @@ pub struct Editor {
     pub count: Option<std::num::NonZeroUsize>,
     pub selected_register: Option<char>,
     pub registers: Registers,
+    pub macro_recording: Option<(char, Vec<KeyEvent>)>,
     pub theme: Theme,
     pub language_servers: helix_lsp::Registry,
     pub clipboard_provider: Box<dyn ClipboardProvider>,
@@ -203,6 +205,7 @@ impl Editor {
             documents: BTreeMap::new(),
             count: None,
             selected_register: None,
+            macro_recording: None,
             theme: theme_loader.default(),
             language_servers,
             syn_loader,
diff --git a/helix-view/src/input.rs b/helix-view/src/input.rs
index b207c3ed..92caa517 100644
--- a/helix-view/src/input.rs
+++ b/helix-view/src/input.rs
@@ -234,6 +234,26 @@ impl From<crossterm::event::KeyEvent> for KeyEvent {
     }
 }
 
+#[cfg(feature = "term")]
+impl From<KeyEvent> for crossterm::event::KeyEvent {
+    fn from(KeyEvent { code, modifiers }: KeyEvent) -> Self {
+        if code == KeyCode::Tab && modifiers.contains(KeyModifiers::SHIFT) {
+            // special case for Shift-Tab -> BackTab
+            let mut modifiers = modifiers;
+            modifiers.remove(KeyModifiers::SHIFT);
+            crossterm::event::KeyEvent {
+                code: crossterm::event::KeyCode::BackTab,
+                modifiers: modifiers.into(),
+            }
+        } else {
+            crossterm::event::KeyEvent {
+                code: code.into(),
+                modifiers: modifiers.into(),
+            }
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;