feat: wiki search using git-grep

+ add release note

modules/git/grep.go

@@ -27,6 +27,7 @@ type GrepResult struct {
 type GrepOptions struct {
 	RefName           string
 	MaxResultLimit    int
+	MatchesPerFile    int
 	ContextLineNumber int
 	IsFuzzy           bool
 	PathSpec          []setting.Glob
@@ -54,6 +55,9 @@ func GrepSearch(ctx context.Context, repo *Repository, search string, opts GrepO
 	var results []*GrepResult
 	cmd := NewCommand(ctx, "grep", "--null", "--break", "--heading", "--fixed-strings", "--line-number", "--ignore-case", "--full-name")
 	cmd.AddOptionValues("--context", fmt.Sprint(opts.ContextLineNumber))
+	if opts.MatchesPerFile > 0 {
+		cmd.AddOptionValues("--max-count", fmt.Sprint(opts.MatchesPerFile))
+	}
 	if opts.IsFuzzy {
 		words := strings.Fields(search)
 		for _, word := range words {

modules/git/grep_test.go

@@ -44,6 +44,31 @@ func TestGrepSearch(t *testing.T) {
 		},
 	}, res)
 
+	res, err = GrepSearch(context.Background(), repo, "world", GrepOptions{MatchesPerFile: 1})
+	assert.NoError(t, err)
+	assert.Equal(t, []*GrepResult{
+		{
+			Filename:    "i-am-a-python.p",
+			LineNumbers: []int{1},
+			LineCodes:   []string{"## This is a simple file to do a hello world"},
+		},
+		{
+			Filename:    "java-hello/main.java",
+			LineNumbers: []int{1},
+			LineCodes:   []string{"public class HelloWorld"},
+		},
+		{
+			Filename:    "main.vendor.java",
+			LineNumbers: []int{1},
+			LineCodes:   []string{"public class HelloWorld"},
+		},
+		{
+			Filename:    "python-hello/hello.py",
+			LineNumbers: []int{1},
+			LineCodes:   []string{"## This is a simple file to do a hello world"},
+		},
+	}, res)
+
 	res, err = GrepSearch(context.Background(), repo, "no-such-content", GrepOptions{})
 	assert.NoError(t, err)
 	assert.Len(t, res, 0)