Include match positions in GET / HTTP response

Close #4726

CHANGELOG.md

@@ -26,6 +26,7 @@ CHANGELOG
     - Improved the cache structure, reducing memory footprint per entry by 86x.
         - With the reduced per-entry cost, the cache now has broader coverage.
 - fish: Improved command history (CTRL-R) (#4703) (@bitraid)
+- `GET /` HTTP endpoint now includes `positions` field in each match entry, providing the indices of matched characters for external highlighting (#4726)
 - Bug fixes
     - `--walker=follow` no longer follows symlinks whose target is an ancestor of the walker root, avoiding severe resource exhaustion when a symlink points outside the tree (e.g. Wine's `z:` → `/`) (#4710)
     - Fixed AWK tokenizer not treating a new line character as whitespace

src/terminal.go

@@ -216,8 +216,9 @@ const (
 )
 
 type StatusItem struct {
-	Index int    `json:"index"`
+	Index     int    `json:"index"`
-	Text  string `json:"text"`
+	Text      string `json:"text"`
+	Positions []int  `json:"positions,omitempty"`
 }
 
 type Status struct {
@@ -7869,10 +7870,18 @@ func (t *Terminal) dumpItem(i *Item) StatusItem {
 	if i == nil {
 		return StatusItem{}
 	}
-	return StatusItem{
+	item := StatusItem{
 		Index: int(i.Index()),
 		Text:  i.AsString(t.ansi),
 	}
+	if t.resultMerger.pattern != nil {
+		_, _, pos := t.resultMerger.pattern.MatchItem(i, true, t.slab)
+		if pos != nil {
+			sort.Ints(*pos)
+			item.Positions = *pos
+		}
+	}
+	return item
 }
 
 func (t *Terminal) tryLock(timeout time.Duration) bool {

test/test_server.rb

@@ -16,6 +16,31 @@ class TestServer < TestInteractive
       assert_empty state[:query]
       assert_equal({ index: 0, text: '1' }, state[:current])
 
+      # No positions when query is empty
+      state[:matches].each do |m|
+        assert_nil m[:positions]
+      end
+      assert_nil state[:current][:positions] if state[:current]
+
+      # Positions with a single-character query
+      Net::HTTP.post(fn.call, 'change-query(1)')
+      tmux.until { |lines| assert_equal 2, lines.match_count }
+      state = JSON.parse(Net::HTTP.get(fn.call), symbolize_names: true)
+      assert_equal [0], state[:current][:positions]
+      state[:matches].each do |m|
+        assert_includes m[:text], '1'
+        assert_equal [m[:text].index('1')], m[:positions]
+      end
+
+      # Positions with a multi-character query; verify sorted ascending
+      Net::HTTP.post(fn.call, 'change-query(10)')
+      tmux.until { |lines| assert_equal 1, lines.match_count }
+      state = JSON.parse(Net::HTTP.get(fn.call), symbolize_names: true)
+      assert_equal '10', state[:current][:text]
+      assert_equal [0, 1], state[:current][:positions]
+      assert_equal state[:current][:positions], state[:current][:positions].sort
+
+      # No match — no current item
       Net::HTTP.post(fn.call, 'change-query(yo)+reload(seq 100)+change-prompt:hundred> ')
       tmux.until { |lines| assert_equal 100, lines.item_count }
       tmux.until { |lines| assert_equal 'hundred> yo', lines[-1] }