Clean up diff output a bit

src/util.mjs

@@ -7,9 +7,7 @@ import {execSync} from 'node:child_process';
  * @param {string} str
  * @returns {string}
  */
-function toBase64 (str) {
-	return Buffer.from(str, 'utf-8').toString('base64');
-}
+const toBase64 = str => Buffer.from(str, 'utf-8').toString('base64');
 
 /**
  * terrible terrible terrible string diff helper for debugging
@@ -19,13 +17,14 @@ function toBase64 (str) {
 export function diff (a, b) {
 	// base64 input strings before passing to shell to avoid escaping issues
 	// https://stackoverflow.com/a/60221847
-	// also use `|| true` to not throw an error when `diff` returns non-zero
-	execSync(`bash -c '
-		diff --color -u <(echo ${toBase64(a)} | base64 -d) <(echo ${toBase64(b)} | base64 -d)
-	' || true`, {
+	// use tail to cut off useless file info lines
+	execSync(String.raw`bash <<- EOF
+		diff --color=always -u \
+			<(echo "${toBase64(a)}" | base64 -d) \
+			<(echo "${toBase64(b)}" | base64 -d) \
+		| tail -n +3
+	EOF`, {
 		// display result directly in terminal
 		stdio: 'inherit',
 	});
 }
-
-'yeet'