[FEAT] add fallback repo search using git grep

services/repository/files/search_test.go

@@ -0,0 +1,48 @@
+package files
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/contexttest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewRepoGrep(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	ctx, _ := contexttest.MockContext(t, "user2/repo1")
+	ctx.SetParams(":id", "1")
+	contexttest.LoadRepo(t, ctx, 1)
+	contexttest.LoadRepoCommit(t, ctx)
+	contexttest.LoadUser(t, ctx, 2)
+	contexttest.LoadGitRepo(t, ctx)
+	defer ctx.Repo.GitRepo.Close()
+
+	t.Run("with result", func(t *testing.T) {
+		res, err := NewRepoGrep(ctx, ctx.Repo.Repository, "Description")
+		assert.NoError(t, err)
+
+		expected := []*Result{
+			{
+				RepoID:         0,
+				Filename:       "README.md",
+				CommitID:       "master",
+				UpdatedUnix:    0,
+				Language:       "Markdown",
+				Color:          "#083fa1",
+				LineNumbers:    []int64{2, 3},
+				FormattedLines: "\nDescription for repo1",
+			},
+		}
+
+		assert.EqualValues(t, res, expected)
+	})
+
+	t.Run("empty result", func(t *testing.T) {
+		res, err := NewRepoGrep(ctx, ctx.Repo.Repository, "keyword that does not match in the repo")
+		assert.NoError(t, err)
+
+		assert.EqualValues(t, res, []*Result{})
+	})
+}