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use crate::state::{Direction, Granularity, Mode, State};
/// 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).
pub type Command = fn(state: &mut State, count: usize);
pub fn move_char_left(state: &mut State, count: usize) {
// TODO: use a transaction
let selection = state.move_selection(
// TODO: remove the clone here
state.selection.clone(),
Direction::Backward,
Granularity::Character,
count,
);
state.selection = selection;
}
pub fn move_char_right(state: &mut State, count: usize) {
// TODO: use a transaction
state.selection = state.move_selection(
// TODO: remove the clone here
state.selection.clone(),
Direction::Forward,
Granularity::Character,
count,
);
}
pub fn move_line_up(state: &mut State, count: usize) {
// TODO: use a transaction
state.selection = state.move_selection(
// TODO: remove the clone here
state.selection.clone(),
Direction::Backward,
Granularity::Line,
count,
);
}
pub fn move_line_down(state: &mut State, count: usize) {
// TODO: use a transaction
state.selection = state.move_selection(
// TODO: remove the clone here
state.selection.clone(),
Direction::Forward,
Granularity::Line,
count,
);
}
pub fn insert_mode(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
}
pub fn normal_mode(state: &mut State, _count: usize) {
state.mode = Mode::Normal;
}
// TODO: insert means add text just before cursor, on exit we should be on the last letter.
pub fn insert(state: &mut State, c: char) {
// TODO: needs to work with multiple cursors
use crate::transaction::ChangeSet;
let pos = state.selection.primary().head;
let changes = ChangeSet::insert(&state.doc, pos, c);
// TODO: need to store history
changes.apply(state.contents_mut());
state.selection = state.selection.clone().map(&changes);
}
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