Add repo names to heatmap tooltip

Extends the JSON response to include per-day repo names via
array_agg on action.repo_name, and surfaces them in the hover
tooltip below the contribution count.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -12,9 +12,9 @@ JSON, and let a custom profile template render the squares client-side.
 ## What it shows / what it doesn't
 
 - ✅ Daily counts (the green squares)
-- ✅ Hover tooltips with the date and count
-- ❌ Repo names, commit messages, branches, file content — none of that ever
-  leaves the database. Only counts.
+- ✅ Hover tooltips with the date, count, and repo names
+- ❌ Commit messages, branches, file content — none of that ever leaves the
+  database.
 
 ## Architecture
 
@@ -102,7 +102,7 @@ Set `OP_TYPES=5,6,7,9,11,18,24` for a more inclusive count.
 
 ## Endpoints
 
-- `GET /heatmap/{username}.json` — JSON `[{"date":"YYYY-MM-DD","count":N}, ...]`
+- `GET /heatmap/{username}.json` — JSON `[{"date":"YYYY-MM-DD","count":N,"repos":["name", ...]}, ...]`
   for the past ~53 weeks. 1-hour cache header.
 - `GET /healthz` — 200 if the DB is reachable, 503 otherwise.
 

main.go

@@ -1,8 +1,10 @@
 // Package main is a tiny HTTP service that exposes daily contribution counts
-// for a single allowlisted Gitea user, including activity from private repos.
+// and repo names for a single allowlisted Gitea user, including activity from
+// private repos.
 //
 // It reads directly from the Gitea database (the `action` table) using a
-// read-only DB user. Output is JSON: [{"date":"2026-05-04","count":3}, ...].
+// read-only DB user. Output is JSON:
+// [{"date":"2026-05-04","count":3,"repos":["myrepo"]}, ...].
 //
 // Pair with templates/profile-snippet.tmpl on the Gitea side to render a
 // GitHub-style heatmap with hover tooltips on a user profile page.
@@ -22,7 +24,7 @@ import (
 	"syscall"
 	"time"
 
-	_ "github.com/lib/pq"
+	"github.com/lib/pq"
 )
 
 // ---- config ---------------------------------------------------------------
@@ -90,8 +92,9 @@ type heatmapHandler struct {
 }
 
 type dayCount struct {
-	Date  string `json:"date"`
-	Count int    `json:"count"`
+	Date  string   `json:"date"`
+	Count int      `json:"count"`
+	Repos []string `json:"repos"`
 }
 
 func (h *heatmapHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -154,7 +157,12 @@ func (h *heatmapHandler) queryHeatmap(ctx context.Context, username string) ([]d
 	// PostgreSQL doesn't accept lists as a single placeholder.
 	query := fmt.Sprintf(`
 		SELECT to_char(to_timestamp(created_unix) AT TIME ZONE 'UTC', 'YYYY-MM-DD') AS day,
-		       COUNT(*)::int
+		       COUNT(*)::int,
+		       COALESCE(
+		         array_agg(DISTINCT repo_name ORDER BY repo_name)
+		           FILTER (WHERE repo_name IS NOT NULL AND repo_name != ''),
+		         '{}'
+		       ) AS repos
 		FROM "action"
 		WHERE act_user_id = $1
 		  AND created_unix >= $2
@@ -172,7 +180,7 @@ func (h *heatmapHandler) queryHeatmap(ctx context.Context, username string) ([]d
 	var out []dayCount
 	for rows.Next() {
 		var d dayCount
-		if err := rows.Scan(&d.Date, &d.Count); err != nil {
+		if err := rows.Scan(&d.Date, &d.Count, pq.Array(&d.Repos)); err != nil {
 			return nil, fmt.Errorf("scan: %w", err)
 		}
 		out = append(out, d)

templates/profile-snippet.tmpl

@@ -56,7 +56,7 @@
     return;
   }
 
-  const byDate = Object.fromEntries(data.map(d => [d.date, d.count]));
+  const byDate = Object.fromEntries(data.map(d => [d.date, d]));
   const bucket = c =>
     c === 0 ? 0 : c < 3 ? 1 : c < 6 ? 2 : c < 10 ? 3 : 4;
 
@@ -85,10 +85,13 @@
     if (d > today) {
       cell.classList.add('future');
     } else {
-      const c = byDate[fmt(d)] || 0;
+      const entry = byDate[fmt(d)];
+      const c = entry ? entry.count : 0;
+      const repos = entry && entry.repos && entry.repos.length ? entry.repos : [];
       cell.dataset.level = String(bucket(c));
       // Native browser tooltip. For richer ones, swap in Tippy.js etc.
-      cell.title = `${fmt(d)}: ${c} contribution${c === 1 ? '' : 's'}`;
+      const repoLine = repos.length ? '\n' + repos.join('\n') : '';
+      cell.title = `${fmt(d)}: ${c} contribution${c === 1 ? '' : 's'}${repoLine}`;
     }
     frag.appendChild(cell);
   }