feat(util) FileExists

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

util/file.go

+package util
+
+import "os"
+
+func FileExists(filename string) bool {
+	fi, err := os.Lstat(filename)
+	if fi != nil || (err != nil && !os.IsNotExist(err)) {
+		return true
+	}
+	return false
+}

util/file_test.go

+package util
+
+import "testing"
+
+func TestFileDoesNotExist(t *testing.T) {
+	t.Parallel()
+	if FileExists("i would be surprised to discover that this file exists") {
+		t.Fail()
+	}
+}