1 files changed, 50 insertions, 0 deletions
diff --git a/plumbing/format/gitignore/dir.go b/plumbing/format/gitignore/dir.go
new file mode 100644
index 0000000..16e4617
--- /dev/null
+++ b/plumbing/format/gitignore/dir.go
@@ -0,0 +1,50 @@
+package gitignore
+
+import (
+	"io/ioutil"
+	"strings"
+
+	"gopkg.in/src-d/go-billy.v2"
+)
+
+const (
+	commentPrefix = "#"
+	eol           = "\n"
+	gitDir        = ".git"
+	gitignoreFile = ".gitignore"
+)
+
+// ReadPatterns reads gitignore patterns recursively traversing through the directory
+// structure. The result is in the ascending order of priority (last higher).
+func ReadPatterns(fs billy.Filesystem, path []string) (ps []Pattern, err error) {
+	if f, err := fs.Open(fs.Join(append(path, gitignoreFile)...)); err == nil {
+		defer f.Close()
+		if data, err := ioutil.ReadAll(f); err == nil {
+			for _, s := range strings.Split(string(data), eol) {
+				if !strings.HasPrefix(s, commentPrefix) && len(strings.TrimSpace(s)) > 0 {
+					ps = append(ps, ParsePattern(s, path))
+				}
+			}
+		}
+	}
+
+	var fis []billy.FileInfo
+	fis, err = fs.ReadDir(fs.Join(path...))
+	if err != nil {
+		return
+	}
+	for _, fi := range fis {
+		if fi.IsDir() && fi.Name() != gitDir {
+			var subps []Pattern
+			subps, err = ReadPatterns(fs, append(path, fi.Name()))
+			if err != nil {
+				return
+			}
+			if len(subps) > 0 {
+				ps = append(ps, subps...)
+			}
+		}
+	}
+
+	return
+}