Add existence functions

tsavola · Jan 3, 2022 · 0516094 · 0516094
1 parent 780aa81
commit 0516094
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/main.go b/main.go
@@ -66,6 +66,12 @@ func Fields(s string) []string {
 	return strings.Fields(s)
 }
 
+// Exists path?
+func Exists(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil || !os.IsNotExist(err)
+}
+
 // Glob terminates program on error.  Results of multiple pattern will be
 // concatenated.
 func Glob(patterns ...string) []string {
@@ -448,6 +454,13 @@ func Outdated(target string, sources func() []string) func() bool {
 	}
 }
 
+// Missing condition.
+func Missing(path string) func() bool {
+	return func() bool {
+		return !Exists(path)
+	}
+}
+
 // Thunk returns a function which returns the string in a slice.
 func Thunk(strings ...string) func() []string {
 	return func() []string {