From 98bdc477463bd40c00d71fb7da577b5f8ff6fbf4 Mon Sep 17 00:00:00 2001
From: AJ ONeal <aj@therootcompany.com>
Date: Sun, 1 Mar 2026 00:10:36 -0700
Subject: [PATCH] feat(monorel): validate existing .goreleaser.yaml instead of
 diffing content

Replace the exact-content comparison with yamlLooksCorrect(), which checks
three semantic markers:

  - -X main.version={{.Env.VERSION}} present (version injection)
  - <binname>_{{ .Env.VERSION }}_ present for every binary (archive naming)
  - {{ .ProjectName }} / {{.ProjectName}} absent (not a stock template)

If the file passes all checks it is left completely untouched, preserving
any compatible local edits. Only files that fail a check are regenerated.
---
 tools/monorel/main.go | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/tools/monorel/main.go b/tools/monorel/main.go
index 4e807ce..f196155 100644
--- a/tools/monorel/main.go
+++ b/tools/monorel/main.go
@@ -317,7 +317,7 @@ func initModuleGroup(group *moduleGroup, dryRun bool) {
 	yamlPath := filepath.Join(modRoot, ".goreleaser.yaml")
 	existing, readErr := os.ReadFile(yamlPath)
 	isNewFile := readErr != nil
-	isChanged := isNewFile || string(existing) != yamlContent
+	isChanged := isNewFile || !yamlLooksCorrect(string(existing), bins)
 	if dryRun {
 		if isChanged {
 			fmt.Fprintf(os.Stderr, "[dry-run] would write %s\n", yamlPath)
@@ -966,9 +966,10 @@ func processModule(group *moduleGroup, relPath string) {
 	yamlPath := filepath.Join(modRoot, ".goreleaser.yaml")
 	existing, readErr := os.ReadFile(yamlPath)
 	isNewFile := readErr != nil
-	isChanged := isNewFile || string(existing) != yamlContent
+	isChanged := isNewFile || !yamlLooksCorrect(string(existing), bins)
 	if !isNewFile && isChanged {
-		// Warn if a stock {{ .ProjectName }} template is in use.
+		// Warn if a stock {{ .ProjectName }} template is in use (one of the
+		// reasons yamlLooksCorrect may have returned false).
 		hasProjectName := strings.Contains(string(existing), "{{ .ProjectName }}") ||
 			strings.Contains(string(existing), "{{.ProjectName}}")
 		gitInfo, gitErr := os.Stat(filepath.Join(modRoot, ".git"))
@@ -1243,6 +1244,31 @@ func goreleaserYAML(projectName string, bins []binary) string {
 	return b.String()
 }
 
+// yamlLooksCorrect returns true when content appears to be a valid monorel-
+// generated (or compatible) .goreleaser.yaml for the given binaries:
+//
+//   - `-X main.version={{.Env.VERSION}}` is present (version injection)
+//   - `<binname>_{{ .Env.VERSION }}_` is present for every binary (archive naming)
+//   - `{{ .ProjectName }}` / `{{.ProjectName}}` are absent (stock goreleaser template)
+//
+// When these hold the file is left untouched so that compatible local edits
+// (e.g. adding extra build targets or tweaking flags) are preserved.
+func yamlLooksCorrect(content string, bins []binary) bool {
+	if !strings.Contains(content, "-X main.version={{.Env.VERSION}}") {
+		return false
+	}
+	for _, bin := range bins {
+		if !strings.Contains(content, bin.name+"_{{ .Env.VERSION }}_") {
+			return false
+		}
+	}
+	if strings.Contains(content, "{{ .ProjectName }}") ||
+		strings.Contains(content, "{{.ProjectName}}") {
+		return false
+	}
+	return true
+}
+
 // ── Release script generation ──────────────────────────────────────────────
 
 // printModuleScript emits one module's release steps to stdout.