Added ex mode to line editor, a 'keymap' builtin, and a zsh-like widget system using ':!<shellcmd>' ex mode commands

src/readline/vimode/insert.rs

@@ -0,0 +1,124 @@
+use super::{common_cmds, CmdReplay, ModeReport, ViMode};
+use crate::readline::keys::{KeyCode as K, KeyEvent as E, ModKeys as M};
+use crate::readline::vicmd::{
+  Direction, Motion, MotionCmd, To, Verb, VerbCmd, ViCmd, Word,
+};
+
+#[derive(Default, Clone, Debug)]
+pub struct ViInsert {
+  cmds: Vec<ViCmd>,
+  pending_cmd: ViCmd,
+  repeat_count: u16,
+}
+
+impl ViInsert {
+  pub fn new() -> Self {
+    Self::default()
+  }
+  pub fn with_count(mut self, repeat_count: u16) -> Self {
+    self.repeat_count = repeat_count;
+    self
+  }
+  pub fn register_and_return(&mut self) -> Option<ViCmd> {
+    let mut cmd = self.take_cmd();
+    cmd.normalize_counts();
+    self.register_cmd(&cmd);
+    Some(cmd)
+  }
+  pub fn ctrl_w_is_undo(&self) -> bool {
+    let insert_count = self
+      .cmds
+      .iter()
+      .filter(|cmd: &&ViCmd| matches!(cmd.verb(), Some(VerbCmd(1, Verb::InsertChar(_)))))
+      .count();
+    let backspace_count = self
+      .cmds
+      .iter()
+      .filter(|cmd: &&ViCmd| matches!(cmd.verb(), Some(VerbCmd(1, Verb::Delete))))
+      .count();
+    insert_count > backspace_count
+  }
+  pub fn register_cmd(&mut self, cmd: &ViCmd) {
+    self.cmds.push(cmd.clone())
+  }
+  pub fn take_cmd(&mut self) -> ViCmd {
+    std::mem::take(&mut self.pending_cmd)
+  }
+}
+
+impl ViMode for ViInsert {
+  fn handle_key(&mut self, key: E) -> Option<ViCmd> {
+    match key {
+      E(K::Char(ch), M::NONE) => {
+        self.pending_cmd.set_verb(VerbCmd(1, Verb::InsertChar(ch)));
+        self
+          .pending_cmd
+          .set_motion(MotionCmd(1, Motion::ForwardChar));
+        self.register_and_return()
+      }
+      E(K::Char('W'), M::CTRL) => {
+        self.pending_cmd.set_verb(VerbCmd(1, Verb::Delete));
+        self.pending_cmd.set_motion(MotionCmd(
+          1,
+          Motion::WordMotion(To::Start, Word::Normal, Direction::Backward),
+        ));
+        self.register_and_return()
+      }
+      E(K::Char('H'), M::CTRL) | E(K::Backspace, M::NONE) => {
+        self.pending_cmd.set_verb(VerbCmd(1, Verb::Delete));
+        self
+          .pending_cmd
+          .set_motion(MotionCmd(1, Motion::BackwardCharForced));
+        self.register_and_return()
+      }
+
+      E(K::BackTab, M::NONE) => {
+        self
+          .pending_cmd
+          .set_verb(VerbCmd(1, Verb::CompleteBackward));
+        self.register_and_return()
+      }
+
+      E(K::Char('I'), M::CTRL) | E(K::Tab, M::NONE) => {
+        self.pending_cmd.set_verb(VerbCmd(1, Verb::Complete));
+        self.register_and_return()
+      }
+
+      E(K::Esc, M::NONE) => {
+        self.pending_cmd.set_verb(VerbCmd(1, Verb::NormalMode));
+        self
+          .pending_cmd
+          .set_motion(MotionCmd(1, Motion::BackwardChar));
+        self.register_and_return()
+      }
+      _ => common_cmds(key),
+    }
+  }
+
+  fn is_repeatable(&self) -> bool {
+    true
+  }
+
+  fn as_replay(&self) -> Option<CmdReplay> {
+    Some(CmdReplay::mode(self.cmds.clone(), self.repeat_count))
+  }
+
+  fn cursor_style(&self) -> String {
+    "\x1b[6 q".to_string()
+  }
+  fn pending_seq(&self) -> Option<String> {
+    None
+  }
+  fn move_cursor_on_undo(&self) -> bool {
+    true
+  }
+  fn clamp_cursor(&self) -> bool {
+    false
+  }
+  fn hist_scroll_start_pos(&self) -> Option<To> {
+    Some(To::End)
+  }
+  fn report_mode(&self) -> ModeReport {
+    ModeReport::Insert
+  }
+}