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use crate::graphemes::next_grapheme_boundary;
use crate::selection::Range;
use crate::state::{Direction, Granularity, Mode, State};
use crate::transaction::{ChangeSet, Transaction};
use crate::Tendril;
/// 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(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(Direction::Forward, Granularity::Character, count);
}
pub fn move_line_up(state: &mut State, count: usize) {
// TODO: use a transaction
state.selection = state.move_selection(Direction::Backward, Granularity::Line, count);
}
pub fn move_line_down(state: &mut State, count: usize) {
// TODO: use a transaction
state.selection = state.move_selection(Direction::Forward, Granularity::Line, count);
}
// avoid select by default by having a visual mode switch that makes movements into selects
// insert mode:
// first we calculate the correct cursors/selections
// then we just append at each cursor
// lastly, if it was append mode we shift cursor by 1?
// inserts at the start of each selection
pub fn insert_mode(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
state.selection = state
.selection
.transform(|range| Range::new(range.to(), range.from()))
}
// inserts at the end of each selection
pub fn append_mode(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
// TODO: as transaction
let text = &state.doc.slice(..);
state.selection = state.selection.transform(|range| {
// TODO: to() + next char
Range::new(range.from(), next_grapheme_boundary(text, range.to()))
})
}
// I inserts at the start of each line with a selection
// A inserts at the end of each line with a selection
// o inserts a new line before each line with a selection
// O inserts a new line after each line with a selection
pub fn normal_mode(state: &mut State, _count: usize) {
// TODO: if leaving append mode, move cursor back by 1
state.mode = Mode::Normal;
}
// TODO: insert means add text just before cursor, on exit we should be on the last letter.
pub fn insert_char(state: &mut State, c: char) {
let c = Tendril::from_char(c);
let transaction = Transaction::insert(&state, c);
transaction.apply(state);
// TODO: need to store into history if successful
}
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