feat(format): add runtime semantic-equality safety gate

2026-07-17 14:29:24 +02:00
parent 4abc89700f
commit bac966c2ac
7 changed files with 107 additions and 44 deletions
@@ -63,6 +63,10 @@ func cmdFmt(args []string, stdin io.Reader, stdout, stderr io.Writer) int {
 			return 2
 		}
 		out := format.File(parser.Parse(string(src)), st)
+		if !format.SemanticallyEqual(string(src), out) {
+			_, _ = fmt.Fprintln(stderr, "pgtidy: refusing to format stdin: formatter safety check failed (output would change code content)")
+			return 2
+		}
 		switch {
 		case check:
 			if out != string(src) {
@@ -86,6 +90,11 @@ func cmdFmt(args []string, stdin io.Reader, stdout, stderr io.Writer) int {
 			continue
 		}
 		out := format.File(parser.Parse(string(src)), st)
+		if !format.SemanticallyEqual(string(src), out) {
+			_, _ = fmt.Fprintf(stderr, "pgtidy: refusing to format %s: formatter safety check failed (output would change code content)\n", path)
+			exit = 2
+			continue
+		}
 		changed := out != string(src)
 		if changed {
 			anyDiff = true