Add Helix editing mode

src/edit_mode/hx/command.rs

@@ -0,0 +1,239 @@
+use super::{motion::HxCharSearch, motion::Motion, parser::ReedlineOption};
+use crate::{EditCommand, Hx, ReedlineEvent};
+use std::iter::Peekable;
+
+pub fn parse_command<'iter, I>(input: &mut Peekable<I>) -> Option<Command>
+where
+    I: Iterator<Item = &'iter char>,
+{
+    match input.peek() {
+        Some('d') => {
+            let _ = input.next();
+            Some(Command::Delete)
+        }
+        Some('p') => {
+            let _ = input.next();
+            Some(Command::PasteAfter)
+        }
+        Some('P') => {
+            let _ = input.next();
+            Some(Command::PasteBefore)
+        }
+        Some('i') => {
+            let _ = input.next();
+            Some(Command::EnterHxInsert)
+        }
+        Some('a') => {
+            let _ = input.next();
+            Some(Command::EnterHxAppend)
+        }
+        Some('u') => {
+            let _ = input.next();
+            Some(Command::Undo)
+        }
+        Some('U') => {
+            let _ = input.next();
+            Some(Command::Redo)
+        }
+        Some('c') => {
+            let _ = input.next();
+            Some(Command::Change)
+        }
+        Some('x') => {
+            let _ = input.next();
+            Some(Command::SelectLine)
+        }
+        Some('?') => {
+            let _ = input.next();
+            Some(Command::HistorySearch)
+        }
+        Some('I') => {
+            let _ = input.next();
+            Some(Command::PrependToStart)
+        }
+        Some('A') => {
+            let _ = input.next();
+            Some(Command::AppendToEnd)
+        }
+        Some('~') => {
+            let _ = input.next();
+            Some(Command::Switchcase)
+        }
+        Some('-') => {
+            let _ = input.next();
+            Some(Command::TrimSelection)
+        }
+        Some('.') => {
+            let _ = input.next();
+            Some(Command::RepeatLastInsertion)
+        }
+        _ => None,
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum Command {
+    Incomplete,
+    Delete,
+    DeleteChar,
+    ReplaceChar(char),
+    PasteAfter,
+    PasteBefore,
+    EnterHxAppend,
+    EnterHxInsert,
+    Undo,
+    Redo,
+    SelectLine,
+    TrimSelection,
+    AppendToEnd,
+    PrependToStart,
+    Change,
+    HistorySearch,
+    Switchcase,
+    RepeatLastInsertion,
+}
+
+impl Command {
+    pub fn whole_line_char(&self) -> Option<char> {
+        match self {
+            Command::Delete => Some('d'),
+            Command::Change => Some('c'),
+            _ => None,
+        }
+    }
+
+    pub fn requires_motion(&self) -> bool {
+        matches!(self, Command::Delete | Command::Change)
+    }
+
+    pub fn to_reedline(&self, hx_state: &mut Hx) -> Vec<ReedlineOption> {
+        match self {
+            Self::EnterHxInsert => vec![ReedlineOption::Event(ReedlineEvent::Repaint)],
+            Self::EnterHxAppend => vec![ReedlineOption::Edit(EditCommand::MoveRight)],
+            Self::PasteAfter => vec![ReedlineOption::Edit(EditCommand::PasteCutBufferAfter)],
+            Self::PasteBefore => vec![ReedlineOption::Edit(EditCommand::PasteCutBufferBefore)],
+            Self::Undo => vec![ReedlineOption::Edit(EditCommand::Undo)],
+            Self::AppendToEnd => vec![ReedlineOption::Edit(EditCommand::MoveToLineEnd)],
+            Self::PrependToStart => vec![ReedlineOption::Edit(EditCommand::MoveToLineStart)],
+            Self::DeleteChar => vec![ReedlineOption::Edit(EditCommand::CutChar)],
+            Self::ReplaceChar(c) => {
+                vec![ReedlineOption::Edit(EditCommand::ReplaceChar(*c))]
+            }
+            Self::HistorySearch => vec![ReedlineOption::Event(ReedlineEvent::SearchHistory)],
+            Self::Switchcase => vec![ReedlineOption::Edit(EditCommand::SwitchcaseChar)],
+            // Mark a command as incomplete whenever a motion is required to finish the command
+            Self::Delete | Self::Change | Self::Incomplete => vec![ReedlineOption::Incomplete],
+            Self::RepeatLastInsertion => match &hx_state.previous {
+                Some(event) => vec![ReedlineOption::Event(event.clone())],
+                None => vec![],
+            },
+            Self::Redo => todo!(),
+            Self::SelectLine => todo!(),
+            Self::TrimSelection => todo!(),
+        }
+    }
+
+    pub fn to_reedline_with_motion(
+        &self,
+        motion: &Motion,
+        hx_state: &mut Hx,
+    ) -> Option<Vec<ReedlineOption>> {
+        match self {
+            Self::Delete => match motion {
+                Motion::End => Some(vec![ReedlineOption::Edit(EditCommand::CutToLineEnd)]),
+                Motion::Line => Some(vec![ReedlineOption::Edit(EditCommand::CutCurrentLine)]),
+                Motion::NextWord => {
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutWordRightToNext)])
+                }
+                Motion::NextBigWord => Some(vec![ReedlineOption::Edit(
+                    EditCommand::CutBigWordRightToNext,
+                )]),
+                Motion::NextWordEnd => Some(vec![ReedlineOption::Edit(EditCommand::CutWordRight)]),
+                Motion::NextBigWordEnd => {
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutBigWordRight)])
+                }
+                Motion::PreviousWord => Some(vec![ReedlineOption::Edit(EditCommand::CutWordLeft)]),
+                Motion::PreviousBigWord => {
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutBigWordLeft)])
+                }
+                Motion::RightUntil(c) => {
+                    hx_state.last_char_search = Some(HxCharSearch::ToRight(*c));
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutRightUntil(*c))])
+                }
+                Motion::RightBefore(c) => {
+                    hx_state.last_char_search = Some(HxCharSearch::TillRight(*c));
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutRightBefore(*c))])
+                }
+                Motion::LeftUntil(c) => {
+                    hx_state.last_char_search = Some(HxCharSearch::ToLeft(*c));
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutLeftUntil(*c))])
+                }
+                Motion::LeftBefore(c) => {
+                    hx_state.last_char_search = Some(HxCharSearch::TillLeft(*c));
+                    Some(vec![ReedlineOption::Edit(EditCommand::CutLeftBefore(*c))])
+                }
+                Motion::Start => Some(vec![ReedlineOption::Edit(EditCommand::CutFromLineStart)]),
+                Motion::Left => Some(vec![ReedlineOption::Edit(EditCommand::Backspace)]),
+                Motion::Right => Some(vec![ReedlineOption::Edit(EditCommand::Delete)]),
+                Motion::Up => None,
+                Motion::Down => None,
+            },
+            Self::Change => {
+                let op = match motion {
+                    Motion::End => Some(vec![ReedlineOption::Edit(EditCommand::ClearToLineEnd)]),
+                    Motion::Line => Some(vec![
+                        ReedlineOption::Edit(EditCommand::MoveToStart),
+                        ReedlineOption::Edit(EditCommand::ClearToLineEnd),
+                    ]),
+                    Motion::NextWord => {
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutWordRightToNext)])
+                    }
+                    Motion::NextBigWord => Some(vec![ReedlineOption::Edit(
+                        EditCommand::CutBigWordRightToNext,
+                    )]),
+                    Motion::NextWordEnd => {
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutWordRight)])
+                    }
+                    Motion::NextBigWordEnd => {
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutBigWordRight)])
+                    }
+                    Motion::PreviousWord => {
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutWordLeft)])
+                    }
+                    Motion::PreviousBigWord => {
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutBigWordLeft)])
+                    }
+                    Motion::RightUntil(c) => {
+                        hx_state.last_char_search = Some(HxCharSearch::ToRight(*c));
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutRightUntil(*c))])
+                    }
+                    Motion::RightBefore(c) => {
+                        hx_state.last_char_search = Some(HxCharSearch::TillRight(*c));
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutRightBefore(*c))])
+                    }
+                    Motion::LeftUntil(c) => {
+                        hx_state.last_char_search = Some(HxCharSearch::ToLeft(*c));
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutLeftUntil(*c))])
+                    }
+                    Motion::LeftBefore(c) => {
+                        hx_state.last_char_search = Some(HxCharSearch::TillLeft(*c));
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutLeftBefore(*c))])
+                    }
+                    Motion::Start => {
+                        Some(vec![ReedlineOption::Edit(EditCommand::CutFromLineStart)])
+                    }
+                    Motion::Left => Some(vec![ReedlineOption::Edit(EditCommand::Backspace)]),
+                    Motion::Right => Some(vec![ReedlineOption::Edit(EditCommand::Delete)]),
+                    Motion::Up => None,
+                    Motion::Down => None,
+                };
+                // Semihack: Append `Repaint` to ensure the mode change gets displayed
+                op.map(|mut vec| {
+                    vec.push(ReedlineOption::Event(ReedlineEvent::Repaint));
+                    vec
+                })
+            }
+            _ => None,
+        }
+    }
+}

src/edit_mode/hx/hx_keybindings.rs

@@ -0,0 +1,26 @@
+use crate::edit_mode::{
+    keybindings::{
+        add_common_control_bindings, add_common_edit_bindings, add_common_navigation_bindings,
+    },
+    Keybindings,
+};
+
+/// Default Hx normal keybindings
+pub fn default_hx_normal_keybindings() -> Keybindings {
+    let mut kb = Keybindings::new();
+
+    add_common_control_bindings(&mut kb);
+    add_common_navigation_bindings(&mut kb);
+    kb
+}
+
+/// Default Hx insert keybindings
+pub fn default_hx_insert_keybindings() -> Keybindings {
+    let mut kb = Keybindings::new();
+
+    add_common_control_bindings(&mut kb);
+    add_common_navigation_bindings(&mut kb);
+    add_common_edit_bindings(&mut kb);
+
+    kb
+}