From f0f2daef76bcf89e34acd035948817601bc739e5 Mon Sep 17 00:00:00 2001 From: Pascal Kuthe Date: Mon, 20 Feb 2023 16:31:26 +0100 Subject: [PATCH] don't move cursor while forward deleting in append mode Currently, when forward deleting (`delete_char_forward` bound to `del`, `delete_word_forward`, `kill_to_line_end`) the cursor is moved to the left in append mode (or generally when the cursor is at the end of the selection). For example in a document `|abc|def` (|indicates selection) if enter append mode the cursor is moved to `c` and the selection becomes: `|abcd|ef`. When deleting forward (`del`) `d` is deleted. The expectation would be that the selection doesn't shrink so that `del` again deletes `e` and then `f`. This would look as follows: `|abcd|ef` `|abce|f` `|abcf|` `|abc |` This is inline with how other editors like kakoune work. However, helix currently moves the selection backwards leading to the following behavior: `|abcd|ef` `|abc|ef` `|ab|ef` `ef` This means that `delete_char_forward` essentially acts like `delete_char_backward` after deleting the first character in append mode. To fix the problem the cursor must be moved to the right while deleting forward (first fix in this commit). Furthermore, when the EOF char is reached a newline char must be inserted (just like when entering appendmode) to prevent the cursor from moving to the right --- helix-core/src/transaction.rs | 5 ++ helix-term/src/commands.rs | 141 +++++++++++++++++++++++----------- 2 files changed, 101 insertions(+), 45 deletions(-) diff --git a/helix-core/src/transaction.rs b/helix-core/src/transaction.rs index 19150c4979217..d568f6fbe45c9 100644 --- a/helix-core/src/transaction.rs +++ b/helix-core/src/transaction.rs @@ -541,6 +541,11 @@ impl Transaction { Self::from(changeset) } + pub fn insert_at_eof(mut self, text: Tendril) -> Transaction { + self.changes.insert(text); + self + } + /// Generate a transaction with a change per selection range. pub fn change_by_selection(doc: &Rope, selection: &Selection, f: F) -> Self where diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs index 8e5bb73059e77..a2c5cdf3c8f23 100644 --- a/helix-term/src/commands.rs +++ b/helix-term/src/commands.rs @@ -771,42 +771,50 @@ fn extend_to_line_start(cx: &mut Context) { } fn kill_to_line_start(cx: &mut Context) { - delete_by_selection_insert_mode(cx, move |text, range| { - let line = range.cursor_line(text); - let first_char = text.line_to_char(line); - let anchor = range.cursor(text); - let head = if anchor == first_char && line != 0 { - // select until previous line - line_end_char_index(&text, line - 1) - } else if let Some(pos) = find_first_non_whitespace_char(text.line(line)) { - if first_char + pos < anchor { - // select until first non-blank in line if cursor is after it - first_char + pos + delete_by_selection_insert_mode( + cx, + move |text, range| { + let line = range.cursor_line(text); + let first_char = text.line_to_char(line); + let anchor = range.cursor(text); + let head = if anchor == first_char && line != 0 { + // select until previous line + line_end_char_index(&text, line - 1) + } else if let Some(pos) = find_first_non_whitespace_char(text.line(line)) { + if first_char + pos < anchor { + // select until first non-blank in line if cursor is after it + first_char + pos + } else { + // select until start of line + first_char + } } else { // select until start of line first_char - } - } else { - // select until start of line - first_char - }; - (head, anchor) - }); + }; + (head, anchor) + }, + Direction::Backward, + ); } fn kill_to_line_end(cx: &mut Context) { - delete_by_selection_insert_mode(cx, |text, range| { - let line = range.cursor_line(text); - let line_end_pos = line_end_char_index(&text, line); - let pos = range.cursor(text); + delete_by_selection_insert_mode( + cx, + |text, range| { + let line = range.cursor_line(text); + let line_end_pos = line_end_char_index(&text, line); + let pos = range.cursor(text); - // if the cursor is on the newline char delete that - if pos == line_end_pos { - (pos, text.line_to_char(line + 1)) - } else { - (pos, line_end_pos) - } - }); + // if the cursor is on the newline char delete that + if pos == line_end_pos { + (pos, text.line_to_char(line + 1)) + } else { + (pos, line_end_pos) + } + }, + Direction::Forward, + ); } fn goto_first_nonwhitespace(cx: &mut Context) { @@ -2279,13 +2287,44 @@ fn delete_selection_impl(cx: &mut Context, op: Operation) { fn delete_by_selection_insert_mode( cx: &mut Context, mut f: impl FnMut(RopeSlice, &Range) -> Deletion, + direction: Direction, ) { let (view, doc) = current!(cx.editor); let text = doc.text().slice(..); - let transaction = + let mut selection = SmallVec::new(); + let mut insert_newline = false; + let text_len = text.len_chars(); + let mut transaction = Transaction::delete_by_selection(doc.text(), doc.selection(view.id), |range| { - f(text, range) + let (start, end) = f(text, range); + if direction == Direction::Forward { + let mut range = *range; + if range.head > range.anchor { + insert_newline |= end == text_len; + // move the cursor to the right so that the selection + // doesn't shrink when deleting forward (so the text appears to + // move the the left) + // += 1 is enoug here as the range is normalized to grapheme boundaries + // later anyway + range.head += 1; + } + selection.push(range); + } + (start, end) }); + + // in case we delete the last character and the cursor would be moved to the EOF char + // insert a newline, just like when entering append mode + if insert_newline { + transaction = transaction.insert_at_eof(doc.line_ending.as_str().into()); + } + + if direction == Direction::Forward { + doc.set_selection( + view.id, + Selection::new(selection, doc.selection(view.id).primary_index()), + ); + } doc.apply(&transaction, view.id); lsp::signature_help_impl(cx, SignatureHelpInvoked::Automatic); } @@ -3437,28 +3476,40 @@ pub mod insert { pub fn delete_char_forward(cx: &mut Context) { let count = cx.count(); - delete_by_selection_insert_mode(cx, |text, range| { - let pos = range.cursor(text); - (pos, graphemes::nth_next_grapheme_boundary(text, pos, count)) - }) + delete_by_selection_insert_mode( + cx, + |text, range| { + let pos = range.cursor(text); + (pos, graphemes::nth_next_grapheme_boundary(text, pos, count)) + }, + Direction::Forward, + ) } pub fn delete_word_backward(cx: &mut Context) { let count = cx.count(); - delete_by_selection_insert_mode(cx, |text, range| { - let anchor = movement::move_prev_word_start(text, *range, count).from(); - let next = Range::new(anchor, range.cursor(text)); - let range = exclude_cursor(text, next, *range); - (range.from(), range.to()) - }); + delete_by_selection_insert_mode( + cx, + |text, range| { + let anchor = movement::move_prev_word_start(text, *range, count).from(); + let next = Range::new(anchor, range.cursor(text)); + let range = exclude_cursor(text, next, *range); + (range.from(), range.to()) + }, + Direction::Backward, + ); } pub fn delete_word_forward(cx: &mut Context) { let count = cx.count(); - delete_by_selection_insert_mode(cx, |text, range| { - let head = movement::move_next_word_end(text, *range, count).to(); - (range.cursor(text), head) - }); + delete_by_selection_insert_mode( + cx, + |text, range| { + let head = movement::move_next_word_end(text, *range, count).to(); + (range.cursor(text), head) + }, + Direction::Forward, + ); } }