randrews
eabeaf1bf8
Widgets (CodeEditor, TextField, Dialog) plus clipboard/text internals, extracted from the kiln workspace. No game-engine dependency. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
72 lines
2.3 KiB
Rust
72 lines
2.3 KiB
Rust
//! Small char/width/key helpers shared by the text widgets
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//! ([`code_editor`](crate::code_editor), [`text_field`](crate::text_field)).
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use ratatui::crossterm::event::{KeyEvent, KeyModifiers};
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use unicode_width::UnicodeWidthChar;
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/// Columns a tab advances to (tab stop).
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pub(crate) const TAB_WIDTH: usize = 4;
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/// Byte offset of character index `col` within `s` (clamped to `s.len()`).
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pub(crate) fn byte_of(s: &str, col: usize) -> usize {
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s.char_indices().nth(col).map_or(s.len(), |(b, _)| b)
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}
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/// Display width of `c` at running display column `at` (tabs advance to the next
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/// [`TAB_WIDTH`] stop; wide characters are two cells; zero-width control chars are 0).
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pub(crate) fn char_cells(c: char, at: usize) -> usize {
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if c == '\t' {
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TAB_WIDTH - (at % TAB_WIDTH)
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} else {
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UnicodeWidthChar::width(c).unwrap_or(0)
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}
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}
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/// Display width (terminal cells) of the first `col` characters of `s`.
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pub(crate) fn display_width(s: &str, col: usize) -> usize {
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let mut w = 0;
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for c in s.chars().take(col) {
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w += char_cells(c, w);
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}
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w
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}
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/// Character index after moving one word forward from `col` in `line`: skip the current
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/// run of non-whitespace, then the following whitespace (lands on the next word's start).
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pub(crate) fn next_word(line: &str, col: usize) -> usize {
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let chars: Vec<char> = line.chars().collect();
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let n = chars.len();
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let mut i = col;
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while i < n && !chars[i].is_whitespace() {
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i += 1;
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}
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while i < n && chars[i].is_whitespace() {
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i += 1;
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}
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i
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}
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/// Character index after moving one word backward from `col` in `line`: skip whitespace,
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/// then the preceding word (lands on that word's start).
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pub(crate) fn prev_word(line: &str, col: usize) -> usize {
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let chars: Vec<char> = line.chars().collect();
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let mut i = col;
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while i > 0 && chars[i - 1].is_whitespace() {
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i -= 1;
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}
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while i > 0 && !chars[i - 1].is_whitespace() {
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i -= 1;
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}
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i
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}
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/// Rewrites a `⌘`-modified key to its `ctrl` equivalent (terminals report Super for Cmd
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/// under the kitty protocol; edtui/our bindings key off ctrl).
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pub(crate) fn super_to_ctrl(mut key: KeyEvent) -> KeyEvent {
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if key.modifiers.contains(KeyModifiers::SUPER) {
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key.modifiers.remove(KeyModifiers::SUPER);
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key.modifiers.insert(KeyModifiers::CONTROL);
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}
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key
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}
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