feat(commit): text templating in commit messages

cmd/commit_message_test.go

@@ -0,0 +1,53 @@
+package cmd
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestRenderCommitMessage(t *testing.T) {
+	t.Run("summary and time", func(t *testing.T) {
+		msg := renderCommitMessage("{{ summary }} {{ time }}", "set foo")
+		if !strings.HasPrefix(msg, "set foo ") {
+			t.Errorf("expected prefix 'set foo ', got %q", msg)
+		}
+		parts := strings.SplitN(msg, " ", 3)
+		if len(parts) < 3 || !strings.Contains(parts[2], "T") {
+			t.Errorf("expected RFC3339 time, got %q", msg)
+		}
+	})
+
+	t.Run("empty summary", func(t *testing.T) {
+		msg := renderCommitMessage("{{ summary }} {{ time }}", "")
+		if !strings.HasPrefix(msg, " ") {
+			t.Errorf("expected leading space (empty summary), got %q", msg)
+		}
+	})
+
+	t.Run("default function", func(t *testing.T) {
+		msg := renderCommitMessage(`{{ default "sync" (summary) }}`, "")
+		if msg != "sync" {
+			t.Errorf("expected 'sync', got %q", msg)
+		}
+		msg = renderCommitMessage(`{{ default "sync" (summary) }}`, "set foo")
+		if msg != "set foo" {
+			t.Errorf("expected 'set foo', got %q", msg)
+		}
+	})
+
+	t.Run("env function", func(t *testing.T) {
+		t.Setenv("PDA_TEST_USER", "alice")
+		msg := renderCommitMessage(`{{ env "PDA_TEST_USER" }}: {{ summary }}`, "set foo")
+		if msg != "alice: set foo" {
+			t.Errorf("expected 'alice: set foo', got %q", msg)
+		}
+	})
+
+	t.Run("bad template returns raw", func(t *testing.T) {
+		raw := "{{ bad template"
+		msg := renderCommitMessage(raw, "test")
+		if msg != raw {
+			t.Errorf("expected raw %q, got %q", raw, msg)
+		}
+	})
+}