Fix beta version field becoming stuck when stable is promoted to beta.

Loosen the regular expression to match any versions and uniquely tag the
lines that are being search and replaced.

Fixes: b/326219296
Change-Id: I91d4c9bca3359416f01a3d455f449d3c4b8811b5
Reviewed-on: https://dart-review.googlesource.com/c/homebrew-dart/+/353460
Auto-Submit: Jonas Termansen <sortie@google.com>
Reviewed-by: William Hesse <whesse@google.com>
Commit-Queue: William Hesse <whesse@google.com>

Author: sortie

Formula/dart-beta.rb

@@ -4,7 +4,7 @@
 class DartBeta < Formula
   desc "Beta SDK"
   homepage "https://dart.dev"
-  version "3.1.0"
+  version "3.3.0" # beta
 
   conflicts_with "dart", because: "dart ships the same binaries"
   if OS.mac? && Hardware::CPU.intel?

Formula/dart.rb

@@ -6,7 +6,7 @@ class Dart < Formula
   homepage "https://dart.dev"
 
   head do
-    version "3.4.0-154.0.dev"
+    version "3.4.0-154.0.dev" # dev
     if OS.mac? && Hardware::CPU.intel?
       url "https://storage.googleapis.com/dart-archive/channels/dev/release/3.4.0-154.0.dev/sdk/dartsdk-macos-x64-release.zip"
       sha256 "cc1392b79b7fa5fe210b75669558970ac250ecf72fa20bb0128e6e14ee6aa7de"

lib/src/formula.dart

@@ -7,21 +7,19 @@ String updateFormula(String channel, String contents, String version,
   // Replace the version identifier. Formulas with stable and pre-release
   // versions have multiple identifiers and only the right one should be
   // updated.
-  var versionId = channel == 'stable'
-      ? RegExp(r'version \"\d+\.\d+.\d+\"')
-      : RegExp(r'version \"\d+\.\d+.\d+\-.+\"');
-  contents = contents.replaceAll(versionId, 'version "$version"');
+  final versionId = RegExp(r'version \"\d+\.\d+.\d+(-[^"]+)?\" # ' + channel);
+  contents = contents.replaceAll(versionId, 'version "$version" # $channel');
 
   // Extract files and hashes that are stored in the formula in this format:
   //  url "<url base>/<channel>/release/<version>/sdk/<artifact>.zip"
   //  sha256 "<hash>"
-  var filesAndHashes = RegExp(
+  final filesAndHashes = RegExp(
       'channels/$channel/release'
       r'/\d[\w\d\-\.]*/sdk/([\w\d\-\.]+)\"\n(\s+)sha256 \"[\da-f]+\"',
       multiLine: true);
   return contents.replaceAllMapped(filesAndHashes, (m) {
-    var artifact = m.group(1);
-    var indent = m.group(2);
+    final artifact = m.group(1);
+    final indent = m.group(2);
     return 'channels/$channel/release/$version/sdk/$artifact"\n'
         '${indent}sha256 "${hashes[artifact]}"';
   });

test/formula_test.dart

@@ -7,7 +7,7 @@ import 'package:update_homebrew/src/formula.dart';
 
 const _devFormula = '''
   head do
-    version "2.15.0-65.0.dev"
+    version "2.15.0-65.0.dev" # dev
     if OS.mac? && Hardware::CPU.intel?
       url "https://storage.googleapis.com/dart-archive/channels/dev/release/2.15.0-65.0.dev/sdk/dartsdk-macos-x64-release.zip"
       sha256 "9c71429a806dd2ac7968542771764dd5d1b7c71fd03851c6870eb5c3f687fb1b"
@@ -36,7 +36,7 @@ const _devFormula = '''
 
 const _devFormulaExpected = '''
   head do
-    version "2.16.0-76.0.dev"
+    version "2.16.0-76.0.dev" # dev
     if OS.mac? && Hardware::CPU.intel?
       url "https://storage.googleapis.com/dart-archive/channels/dev/release/2.16.0-76.0.dev/sdk/dartsdk-macos-x64-release.zip"
       sha256 "bbb"