Language statistics bar for repositories (#8037)

* Implementation for calculating language statistics

Impement saving code language statistics to database

Implement rendering langauge stats

Add primary laguage to show in repository list

Implement repository stats indexer queue

Add indexer test

Refactor to use queue module

* Do not timeout for queues

vendor/github.com/src-d/go-oniguruma/quotemeta.go

@@ -0,0 +1,36 @@
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package regexp implements a simple regular expression library.
+
+// QuoteMeta func is copied here to avoid linking the entire Regexp library.
+
+package rubex
+
+func special(c int) bool {
+	for _, r := range `\.+*?()|[]^$` {
+		if c == int(r) {
+			return true
+		}
+	}
+	return false
+}
+
+// QuoteMeta returns a string that quotes all regular expression metacharacters
+// inside the argument text; the returned string is a regular expression matching
+// the literal text.  For example, QuoteMeta(`[foo]`) returns `\[foo\]`.
+func QuoteMeta(s string) string {
+	b := make([]byte, 2*len(s))
+
+	// A byte loop is correct because all metacharacters are ASCII.
+	j := 0
+	for i := 0; i < len(s); i++ {
+		if special(int(s[i])) {
+			b[j] = '\\'
+			j++
+		}
+		b[j] = s[i]
+		j++
+	}
+	return string(b[0:j])
+}