From 6c19d2c1c4f6e0665ceb44e75e5e5315b87d3b4b Mon Sep 17 00:00:00 2001
From: Nikita Revenco <154856872+NikitaRevenco@users.noreply.github.com>
Date: Sun, 12 Jan 2025 20:31:49 +0000
Subject: [PATCH] feat: implement double click and single click selection

---
 helix-core/src/textobject.rs |  7 ++++++-
 helix-term/src/ui/editor.rs  | 24 ++++++++++++++++++++++--
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/helix-core/src/textobject.rs b/helix-core/src/textobject.rs
index 7576b3a78..1225b70a7 100644
--- a/helix-core/src/textobject.rs
+++ b/helix-core/src/textobject.rs
@@ -11,7 +11,12 @@ use crate::syntax::LanguageConfiguration;
 use crate::Range;
 use crate::{surround, Syntax};
 
-fn find_word_boundary(slice: RopeSlice, mut pos: usize, direction: Direction, long: bool) -> usize {
+pub fn find_word_boundary(
+    slice: RopeSlice,
+    mut pos: usize,
+    direction: Direction,
+    long: bool,
+) -> usize {
     use CharCategory::{Eol, Whitespace};
 
     let iter = match direction {
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index f86de5b81..03f5ba97f 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -14,11 +14,13 @@ use crate::{
 };
 
 use helix_core::{
+    chars::CharCategory,
     diagnostic::NumberOrString,
     graphemes::{next_grapheme_boundary, prev_grapheme_boundary},
     movement::Direction,
     syntax::{self, HighlightEvent},
     text_annotations::TextAnnotations,
+    textobject::find_word_boundary,
     unicode::width::UnicodeWidthStr,
     visual_offset_from_block, Change, Position, Range, Selection, Transaction,
 };
@@ -1176,10 +1178,9 @@ impl EditorView {
                 if let Some((pos, view_id)) = pos_and_view(editor, row, column, true) {
                     let prev_view_id = view!(editor).id;
                     let doc = doc_mut!(editor, &view!(editor, view_id).doc);
+                    let text = doc.text().slice(..);
 
                     match editor.mouse_clicks.register_click(pos) {
-                        MouseClick::Triple => {}
-                        MouseClick::Double => {}
                         MouseClick::Single => {
                             if modifiers == KeyModifiers::ALT {
                                 let selection = doc.selection(view_id).clone();
@@ -1200,6 +1201,25 @@ impl EditorView {
                                 doc.set_selection(view_id, Selection::point(pos));
                             }
                         }
+                        MouseClick::Double => {
+                            let word_start =
+                                find_word_boundary(text, pos, Direction::Backward, false);
+                            let word_end = match text
+                                .get_char(pos)
+                                .map(helix_core::chars::categorize_char)
+                            {
+                                None | Some(CharCategory::Whitespace | CharCategory::Eol) => pos,
+                                _ => find_word_boundary(text, pos + 1, Direction::Forward, false),
+                            };
+
+                            doc.set_selection(view_id, Selection::single(word_start, word_end));
+                        }
+                        MouseClick::Triple => {
+                            let current_line = text.char_to_line(pos);
+                            let from = text.line_to_char(current_line);
+                            let to = text.line_to_char(current_line + 1);
+                            doc.set_selection(view_id, Selection::single(from, to));
+                        }
                     }
 
                     if view_id != prev_view_id {