Add "editor: copy highlight json" command

Nate needs this to feed to Figma for highlighted code in designs.

crates/editor/src/editor.rs

@@ -39,7 +39,7 @@ use gpui::{
     impl_actions, impl_internal_actions,
     keymap_matcher::KeymapContext,
     platform::CursorStyle,
-    serde_json::json,
+    serde_json::{self, json},
     AnyViewHandle, AppContext, AsyncAppContext, ClipboardItem, Element, ElementBox, Entity,
     ModelHandle, MouseButton, MutableAppContext, RenderContext, Subscription, Task, View,
     ViewContext, ViewHandle, WeakViewHandle,
@@ -258,7 +258,8 @@ actions!(
         Hover,
         Format,
         ToggleSoftWrap,
-        RevealInFinder
+        RevealInFinder,
+        CopyHighlightJson
     ]
 );
 
@@ -378,6 +379,7 @@ pub fn init(cx: &mut MutableAppContext) {
     cx.add_action(Editor::jump);
     cx.add_action(Editor::toggle_soft_wrap);
     cx.add_action(Editor::reveal_in_finder);
+    cx.add_action(Editor::copy_highlight_json);
     cx.add_async_action(Editor::format);
     cx.add_action(Editor::restart_language_server);
     cx.add_action(Editor::show_character_palette);
@@ -6333,6 +6335,41 @@ impl Editor {
             );
         }
     }
+
+    /// Copy the highlighted chunks to the clipboard as JSON. The format is an array of lines,
+    /// with each line being an array of {text, highlight} objects.
+    fn copy_highlight_json(&mut self, _: &CopyHighlightJson, cx: &mut ViewContext<Self>) {
+        let Some(buffer) = self.buffer.read(cx).as_singleton() else {
+            return;
+        };
+
+        #[derive(Serialize)]
+        struct Chunk<'a> {
+            text: &'a str,
+            highlight: Option<&'a str>,
+        }
+
+        let snapshot = buffer.read(cx).snapshot();
+        let chunks = snapshot.chunks(0..snapshot.len(), true);
+        let mut lines = Vec::new();
+        let mut line = Vec::new();
+
+        let theme = &cx.global::<Settings>().theme.editor.syntax;
+
+        for chunk in chunks {
+            let highlight = chunk.syntax_highlight_id.and_then(|id| id.name(theme));
+            let mut chunk_lines = chunk.text.split("\n").peekable();
+            while let Some(text) = chunk_lines.next() {
+                line.push(Chunk { text, highlight });
+                if chunk_lines.peek().is_some() {
+                    lines.push(mem::take(&mut line));
+                }
+            }
+        }
+
+        let Some(lines) = serde_json::to_string_pretty(&lines).log_err() else { return; };
+        cx.write_to_clipboard(ClipboardItem::new(lines));
+    }
 }
 
 fn consume_contiguous_rows(

crates/language/src/highlight_map.rs

@@ -59,7 +59,6 @@ impl HighlightId {
         theme.highlights.get(self.0 as usize).map(|entry| entry.1)
     }
 
-    #[cfg(any(test, feature = "test-support"))]
     pub fn name<'a>(&self, theme: &'a SyntaxTheme) -> Option<&'a str> {
         theme.highlights.get(self.0 as usize).map(|e| e.0.as_str())
     }