Add PatternSet

lib/chezmoi/pattern_set.go

@@ -0,0 +1,30 @@
+package chezmoi
+
+import "path/filepath"
+
+// An PatternSet is a set of patterns.
+type PatternSet map[string]struct{}
+
+// NewPatternSet returns a new PatternSet.
+func NewPatternSet() PatternSet {
+	return PatternSet(make(map[string]struct{}))
+}
+
+// Add adds pattern to ps.
+func (ps PatternSet) Add(pattern string) error {
+	if _, err := filepath.Match(pattern, ""); err != nil {
+		return nil
+	}
+	ps[pattern] = struct{}{}
+	return nil
+}
+
+// Match returns if name matches any pattern in ps.
+func (ps PatternSet) Match(name string) bool {
+	for pattern := range ps {
+		if ok, _ := filepath.Match(pattern, name); ok {
+			return true
+		}
+	}
+	return false
+}