use helix_core::{ graphemes, indent::TAB_WIDTH, regex::Regex, register, selection, state::{Direction, Granularity, Mode, State}, ChangeSet, Range, Selection, Tendril, Transaction, }; use once_cell::sync::Lazy; use crate::{ prompt::Prompt, view::{View, PADDING}, }; /// 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(view: &mut View, count: usize); pub fn move_char_left(view: &mut View, count: usize) { // TODO: use a transaction let selection = view .state .move_selection(Direction::Backward, Granularity::Character, count); view.state.selection = selection; } pub fn move_char_right(view: &mut View, count: usize) { // TODO: use a transaction view.state.selection = view.state .move_selection(Direction::Forward, Granularity::Character, count); } pub fn move_line_up(view: &mut View, count: usize) { // TODO: use a transaction view.state.selection = view .state .move_selection(Direction::Backward, Granularity::Line, count); } pub fn move_line_down(view: &mut View, count: usize) { // TODO: use a transaction view.state.selection = view .state .move_selection(Direction::Forward, Granularity::Line, count); } pub fn move_line_end(view: &mut View, _count: usize) { // TODO: use a transaction let lines = selection_lines(&view.state); let positions = lines .into_iter() .map(|index| { // adjust all positions to the end of the line. // Line end is pos at the start of next line - 1 // subtract another 1 because the line ends with \n view.state.doc.line_to_char(index + 1).saturating_sub(2) }) .map(|pos| Range::new(pos, pos)); let selection = Selection::new(positions.collect(), 0); let transaction = Transaction::new(&mut view.state).with_selection(selection); transaction.apply(&mut view.state); } pub fn move_line_start(view: &mut View, _count: usize) { let lines = selection_lines(&view.state); let positions = lines .into_iter() .map(|index| { // adjust all positions to the start of the line. view.state.doc.line_to_char(index) }) .map(|pos| Range::new(pos, pos)); let selection = Selection::new(positions.collect(), 0); let transaction = Transaction::new(&mut view.state).with_selection(selection); transaction.apply(&mut view.state); } pub fn move_next_word_start(view: &mut View, count: usize) { let pos = view.state.move_pos( view.state.selection.cursor(), Direction::Forward, Granularity::Word, count, ); // TODO: use a transaction view.state.selection = Selection::single(pos, pos); } pub fn move_prev_word_start(view: &mut View, count: usize) { let pos = view.state.move_pos( view.state.selection.cursor(), Direction::Backward, Granularity::Word, count, ); // TODO: use a transaction view.state.selection = Selection::single(pos, pos); } pub fn move_next_word_end(view: &mut View, count: usize) { let pos = State::move_next_word_end( &view.state.doc().slice(..), view.state.selection.cursor(), count, ); // TODO: use a transaction view.state.selection = Selection::single(pos, pos); } pub fn move_file_start(view: &mut View, _count: usize) { // TODO: use a transaction view.state.selection = Selection::single(0, 0); view.state.mode = Mode::Normal; } pub fn move_file_end(view: &mut View, _count: usize) { // TODO: use a transaction let text = &view.state.doc; let last_line = text.line_to_char(text.len_lines().saturating_sub(2)); view.state.selection = Selection::single(last_line, last_line); view.state.mode = Mode::Normal; } pub fn check_cursor_in_view(view: &mut View) -> bool { let cursor = view.state.selection().cursor(); let line = view.state.doc().char_to_line(cursor); let document_end = view.first_line + view.size.1.saturating_sub(1) as usize; if (line > document_end.saturating_sub(PADDING)) | (line < view.first_line + PADDING) { return false; } true } pub fn page_up(view: &mut View, _count: usize) { if view.first_line < PADDING { return; } view.first_line = view.first_line.saturating_sub(view.size.1 as usize); if !check_cursor_in_view(view) { let text = view.state.doc(); let pos = text.line_to_char(view.last_line().saturating_sub(PADDING)); view.state.selection = Selection::single(pos, pos); } } pub fn page_down(view: &mut View, _count: usize) { view.first_line += view.size.1 as usize + PADDING; if view.first_line < view.state.doc().len_lines() { let text = view.state.doc(); let pos = text.line_to_char(view.first_line as usize); view.state.selection = Selection::single(pos, pos); } } pub fn half_page_up(view: &mut View, _count: usize) { if view.first_line < PADDING { return; } view.first_line = view.first_line.saturating_sub(view.size.1 as usize / 2); if !check_cursor_in_view(view) { let text = &view.state.doc; let pos = text.line_to_char(view.last_line() - PADDING); view.state.selection = Selection::single(pos, pos); } } pub fn half_page_down(view: &mut View, _count: usize) { let lines = view.state.doc().len_lines(); if view.first_line < lines.saturating_sub(view.size.1 as usize) { view.first_line += view.size.1 as usize / 2; } if !check_cursor_in_view(view) { let text = view.state.doc(); let pos = text.line_to_char(view.first_line as usize); view.state.selection = Selection::single(pos, pos); } } // avoid select by default by having a visual mode switch that makes movements into selects pub fn extend_char_left(view: &mut View, count: usize) { // TODO: use a transaction let selection = view .state .extend_selection(Direction::Backward, Granularity::Character, count); view.state.selection = selection; } pub fn extend_char_right(view: &mut View, count: usize) { // TODO: use a transaction view.state.selection = view.state .extend_selection(Direction::Forward, Granularity::Character, count); } pub fn extend_line_up(view: &mut View, count: usize) { // TODO: use a transaction view.state.selection = view.state .extend_selection(Direction::Backward, Granularity::Line, count); } pub fn extend_line_down(view: &mut View, count: usize) { // TODO: use a transaction view.state.selection = view.state .extend_selection(Direction::Forward, Granularity::Line, count); } pub fn split_selection_on_newline(view: &mut View, _count: usize) { let text = &view.state.doc.slice(..); // only compile the regex once #[allow(clippy::trivial_regex)] static REGEX: Lazy = Lazy::new(|| Regex::new(r"\n").unwrap()); // TODO: use a transaction view.state.selection = selection::split_on_matches(text, view.state.selection(), ®EX) } pub fn select_line(view: &mut View, _count: usize) { // TODO: count let pos = view.state.selection().primary(); let text = view.state.doc(); let line = text.char_to_line(pos.head); let start = text.line_to_char(line); let end = text.line_to_char(line + 1).saturating_sub(1); // TODO: use a transaction view.state.selection = Selection::single(start, end); } pub fn delete_selection(view: &mut View, _count: usize) { let transaction = Transaction::change_by_selection(&view.state, |range| (range.from(), range.to() + 1, None)); transaction.apply(&mut view.state); append_changes_to_history(view); } pub fn change_selection(view: &mut View, count: usize) { delete_selection(view, count); insert_mode(view, count); } pub fn collapse_selection(view: &mut View, _count: usize) { view.state.selection = view .state .selection .transform(|range| Range::new(range.head, range.head)) } pub fn flip_selections(view: &mut View, _count: usize) { view.state.selection = view .state .selection .transform(|range| Range::new(range.head, range.anchor)) } fn enter_insert_mode(view: &mut View) { view.state.mode = Mode::Insert; append_changes_to_history(view); } // inserts at the start of each selection pub fn insert_mode(view: &mut View, _count: usize) { enter_insert_mode(view); view.state.selection = view .state .selection .transform(|range| Range::new(range.to(), range.from())) } // inserts at the end of each selection pub fn append_mode(view: &mut View, _count: usize) { enter_insert_mode(view); view.state.restore_cursor = true; // TODO: as transaction let text = &view.state.doc.slice(..); view.state.selection = view.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 { let mut lines = state .selection .ranges() .iter() .map(|range| state.doc.char_to_line(range.head)) .collect::>(); lines.sort_unstable(); // sorting by usize so _unstable is preferred lines.dedup(); lines } // I inserts at the start of each line with a selection pub fn prepend_to_line(view: &mut View, count: usize) { enter_insert_mode(view); move_line_start(view, count); } // A inserts at the end of each line with a selection pub fn append_to_line(view: &mut View, count: usize) { enter_insert_mode(view); move_line_end(view, count); } // o inserts a new line after each line with a selection pub fn open_below(view: &mut View, _count: usize) { enter_insert_mode(view); let lines = selection_lines(&view.state); let positions: Vec<_> = lines .into_iter() .map(|index| { // adjust all positions to the end of the line/start of the next one. view.state.doc.line_to_char(index + 1) }) .collect(); // TODO: use same logic as insert_newline for indentation 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(&view.state, changes).with_selection(selection); transaction.apply(&mut view.state); } // O inserts a new line before each line with a selection fn append_changes_to_history(view: &mut View) { if view.state.changes.is_empty() { return; } let new_changeset = ChangeSet::new(view.state.doc()); let changes = std::mem::replace(&mut view.state.changes, new_changeset); // Instead of doing this messy merge we could always commit, and based on transaction // annotations either add a new layer or compose into the previous one. let transaction = Transaction::from(changes).with_selection(view.state.selection().clone()); // HAXX: we need to reconstruct the state as it was before the changes.. let (doc, selection) = view.state.old_state.take().unwrap(); let mut old_state = State::new(doc); old_state.selection = selection; // TODO: take transaction by value? view.history.commit_revision(&transaction, &old_state); // TODO: need to start the state with these vals // HAXX view.state.old_state = Some((view.state.doc().clone(), view.state.selection.clone())); } pub fn normal_mode(view: &mut View, _count: usize) { view.state.mode = Mode::Normal; append_changes_to_history(view); // if leaving append mode, move cursor back by 1 if view.state.restore_cursor { let text = &view.state.doc.slice(..); view.state.selection = view.state.selection.transform(|range| { Range::new( range.from(), graphemes::prev_grapheme_boundary(text, range.to()), ) }); view.state.restore_cursor = false; } } pub fn goto_mode(view: &mut View, _count: usize) { view.state.mode = Mode::Goto; } // NOTE: Transactions in this module get appended to history when we switch back to normal mode. pub mod insert { use super::*; // TODO: insert means add text just before cursor, on exit we should be on the last letter. pub fn insert_char(view: &mut View, c: char) { let c = Tendril::from_char(c); let transaction = Transaction::insert(&view.state, c); transaction.apply(&mut view.state); } pub fn insert_tab(view: &mut View, _count: usize) { insert_char(view, '\t'); } pub fn insert_newline(view: &mut View, _count: usize) { let transaction = Transaction::change_by_selection(&view.state, |range| { let indent_level = helix_core::indent::suggested_indent_for_pos(&view.state, range.head); let indent = " ".repeat(TAB_WIDTH).repeat(indent_level); let mut text = String::with_capacity(1 + indent.len()); text.push('\n'); text.push_str(&indent); (range.head, range.head, Some(text.into())) }); transaction.apply(&mut view.state); } // TODO: handle indent-aware delete pub fn delete_char_backward(view: &mut View, count: usize) { let text = &view.state.doc.slice(..); let transaction = Transaction::change_by_selection(&view.state, |range| { ( graphemes::nth_prev_grapheme_boundary(text, range.head, count), range.head, None, ) }); transaction.apply(&mut view.state); } pub fn delete_char_forward(view: &mut View, count: usize) { let text = &view.state.doc.slice(..); let transaction = Transaction::change_by_selection(&view.state, |range| { ( range.head, graphemes::nth_next_grapheme_boundary(text, range.head, count), None, ) }); transaction.apply(&mut view.state); } } pub fn insert_char_prompt(prompt: &mut Prompt, c: char) { prompt.insert_char(c); } // Undo / Redo pub fn undo(view: &mut View, _count: usize) { view.history.undo(&mut view.state); // TODO: each command could simply return a Option, then the higher level handles storing it? } pub fn redo(view: &mut View, _count: usize) { view.history.redo(&mut view.state); } // Yank / Paste pub fn yank(view: &mut View, _count: usize) { // TODO: should selections be made end inclusive? let values = view .state .selection() .fragments(&view.state.doc().slice(..)) .map(|cow| cow.into_owned()) .collect(); // TODO: allow specifying reg let reg = '"'; register::set(reg, values); } pub fn paste(view: &mut View, _count: usize) { // TODO: allow specifying reg let reg = '"'; if let Some(values) = register::get(reg) { let repeat = std::iter::repeat( values .last() .map(|value| Tendril::from_slice(value)) .unwrap(), ); // TODO: if any of values ends \n it's linewise paste // // p => paste after // P => paste before // alt-p => paste every yanked selection after selected text // alt-P => paste every yanked selection before selected text // R => replace selected text with yanked text // alt-R => replace selected text with every yanked text // // append => insert at next line // insert => insert at start of line // replace => replace // default insert let linewise = values.iter().any(|value| value.ends_with('\n')); let mut values = values.into_iter().map(Tendril::from).chain(repeat); let transaction = if linewise { // paste on the next line // TODO: can simply take a range + modifier and compute the right pos without ifs let text = view.state.doc(); Transaction::change_by_selection(&view.state, |range| { let line_end = text.line_to_char(text.char_to_line(range.head) + 1); (line_end, line_end, Some(values.next().unwrap())) }) } else { Transaction::change_by_selection(&view.state, |range| { (range.head + 1, range.head + 1, Some(values.next().unwrap())) }) }; transaction.apply(&mut view.state); append_changes_to_history(view); } } fn get_lines(view: &View) -> Vec { let mut lines = Vec::new(); // Get all line numbers for range in view.state.selection.ranges() { let start = view.state.doc.char_to_line(range.from()); let end = view.state.doc.char_to_line(range.to()); for line in start..=end { lines.push(line) } } lines.sort_unstable(); // sorting by usize so _unstable is preferred lines.dedup(); lines } pub fn indent(view: &mut View, _count: usize) { let lines = get_lines(view); // Indent by one level let indent = Tendril::from(" ".repeat(TAB_WIDTH)); let transaction = Transaction::change( &view.state, lines.into_iter().map(|line| { let pos = view.state.doc.line_to_char(line); (pos, pos, Some(indent.clone())) }), ); transaction.apply(&mut view.state); append_changes_to_history(view); } pub fn unindent(view: &mut View, _count: usize) { let lines = get_lines(view); let mut changes = Vec::with_capacity(lines.len()); for line_idx in lines { let line = view.state.doc.line(line_idx); let mut width = 0; for ch in line.chars() { match ch { ' ' => width += 1, '\t' => width = (width / TAB_WIDTH + 1) * TAB_WIDTH, _ => break, } if width >= TAB_WIDTH { break; } } if width > 0 { let start = view.state.doc.line_to_char(line_idx); changes.push((start, start + width, None)) } } let transaction = Transaction::change(&view.state, changes.into_iter()); transaction.apply(&mut view.state); append_changes_to_history(view); } pub fn indent_selection(_view: &mut View, _count: usize) { // loop over each line and recompute proper indentation unimplemented!() }