index: add a search option to exclude files given a regexp

index/index.go

@@ -41,11 +41,12 @@ type IndexOptions struct {
 }
 
 type SearchOptions struct {
-	IgnoreCase     bool
-	LinesOfContext uint
-	FileRegexp     string
-	Offset         int
-	Limit          int
+	IgnoreCase        bool
+	LinesOfContext    uint
+	FileRegexp        string
+	ExcludeFileRegexp string
+	Offset            int
+	Limit             int
 }
 
 type Match struct {
@@ -167,6 +168,14 @@ func (n *Index) Search(pat string, opt *SearchOptions) (*SearchResponse, error)
 		}
 	}
 
+	var efre *regexp.Regexp
+	if opt.ExcludeFileRegexp != "" {
+		efre, err = regexp.Compile(opt.ExcludeFileRegexp)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	files := n.idx.PostingQuery(index.RegexpQuery(re.Syntax))
 	for _, file := range files {
 		var matches []*Match
@@ -178,6 +187,11 @@ func (n *Index) Search(pat string, opt *SearchOptions) (*SearchResponse, error)
 			continue
 		}
 
+		// reject files that match the exclude file pattern
+		if efre != nil && efre.MatchString(name, true, true) > 0 {
+			continue
+		}
+
 		filesOpened++
 		if err := g.grep2File(filepath.Join(n.Ref.dir, "raw", name), re, int(opt.LinesOfContext),
 			func(line []byte, lineno int, before [][]byte, after [][]byte) (bool, error) {