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use crate::graphemes;
use crate::selection::{Range, Selection};
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(),
graphemes::next_grapheme_boundary(text, range.to()),
)
})
}
// TODO: I, A, o and O can share a lot of the primitives.
// calculate line numbers for each selection range
fn selection_lines(state: &State) -> Vec<usize> {
let mut lines = state
.selection
.ranges()
.iter()
.map(|range| state.doc.char_to_line(range.head))
.collect::<Vec<_>>();
lines.sort();
lines.dedup();
lines
}
// I inserts at the start of each line with a selection
pub fn prepend_to_line(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
let lines = selection_lines(state);
let positions = lines
.into_iter()
.map(|index| {
// adjust all positions to the start of the line.
state.doc.line_to_char(index)
})
.map(|pos| Range::new(pos, pos));
let selection = Selection::new(positions.collect(), 0);
let transaction = Transaction::new(state).with_selection(selection);
transaction.apply(state);
// TODO: need to store into history if successful
}
// A inserts at the end of each line with a selection
pub fn append_to_line(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
let lines = selection_lines(state);
let positions = lines
.into_iter()
.map(|index| {
// adjust all positions to the end of the line.
let line = state.doc.line(index);
let line_start = state.doc.line_to_char(index);
line_start + line.len_chars() - 1
})
.map(|pos| Range::new(pos, pos));
let selection = Selection::new(positions.collect(), 0);
let transaction = Transaction::new(state).with_selection(selection);
transaction.apply(state);
// TODO: need to store into history if successful
}
// o inserts a new line after each line with a selection
pub fn open_below(state: &mut State, _count: usize) {
state.mode = Mode::Insert;
let lines = selection_lines(state);
let positions: Vec<_> = lines
.into_iter()
.map(|index| {
// adjust all positions to the end of the line.
let line = state.doc.line(index);
let line_start = state.doc.line_to_char(index);
line_start + line.len_chars()
})
.collect();
let changes = positions.iter().copied().map(|index|
// generate changes
(index, index, Some(Tendril::from_char('\n'))));
// TODO: count actually inserts "n" new lines and starts editing on all of them.
// TODO: append "count" newlines and modify cursors to those lines
let selection = Selection::new(
positions
.iter()
.copied()
.map(|pos| Range::new(pos, pos))
.collect(),
0,
);
let transaction = Transaction::change(state, changes).with_selection(selection);
transaction.apply(state);
// TODO: need to store into history if successful
}
// O inserts a new line before 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
}
// TODO: handle indent-aware delete
pub fn delete_char_backward(state: &mut State, count: usize) {
let text = &state.doc.slice(..);
let transaction = Transaction::change_by_selection(state, |range| {
(
graphemes::nth_prev_grapheme_boundary(text, range.head, count),
range.head,
None,
)
});
transaction.apply(state);
// TODO: need to store into history if successful
}
pub fn delete_char_forward(state: &mut State, count: usize) {
let text = &state.doc.slice(..);
let transaction = Transaction::change_by_selection(state, |range| {
(
graphemes::nth_next_grapheme_boundary(text, range.head, count),
range.head,
None,
)
});
transaction.apply(state);
// TODO: need to store into history if successful
}
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