fix: lookup package in correct location of Dart/Flutter cached packages (#81)

bin/setup.dart

@@ -5,7 +5,6 @@ import 'package:libgit2dart/libgit2dart.dart';
 import 'package:libgit2dart/src/libgit2.dart';
 import 'package:libgit2dart/src/util.dart';
 import 'package:path/path.dart' as path;
-import 'package:pub_cache/pub_cache.dart';
 
 /// Copies prebuilt libgit2 library from package in '.pub_cache' into correct
 /// directory for [platform].
@@ -23,29 +22,26 @@ Future<void> copyLibrary(String platform) async {
       );
     }
   } else {
-    String? checkCache(PubCache pubCache) =>
-        pubCache.getLatestVersion('libgit2dart')?.resolve()?.location.path;
-
-    final libPath = checkCache(PubCache()) ??
-        checkCache(
-          PubCache(
-            Directory(
-              path.join(Platform.environment['FLUTTER_ROOT']!, '.pub-cache'),
-            ),
-          ),
-        );
+    final libPath = checkCache();
     final libName = getLibName();
 
     stdout.writeln('Copying libgit2 for $platform');
+    if (libPath == null) {
+      stdout.writeln(
+        "Couldn't find libgit2dart package.\n"
+        "Make sure to run 'dart pub get' to resolve dependencies.",
+      );
+    } else {
       final destination = path.join(libDir, platform);
       Directory(destination).createSync(recursive: true);
-    File(path.join(libPath!, platform, libName)).copySync(
+      File(path.join(libPath, platform, libName)).copySync(
         path.join(destination, libName),
       );
 
       stdout.writeln('Done! libgit2 for $platform is now available!');
     }
   }
+}
 
 class CleanCommand extends Command<void> {
   @override
@@ -57,9 +53,11 @@ class CleanCommand extends Command<void> {
   @override
   void run() {
     stdout.writeln('Cleaning...');
+    if (Directory(libDir).existsSync()) {
       Directory(libDir).deleteSync(recursive: true);
     }
   }
+}
 
 void main(List<String> args) {
   final runner = CommandRunner<void>(

lib/src/util.dart

@@ -1,12 +1,13 @@
 // coverage:ignore-file
 
+import 'dart:convert';
 import 'dart:ffi';
 import 'dart:io';
 
 import 'package:libgit2dart/src/bindings/libgit2_bindings.dart';
 import 'package:libgit2dart/src/bindings/libgit2_opts_bindings.dart';
 import 'package:path/path.dart' as path;
-import 'package:pub_cache/pub_cache.dart';
+import 'package:pub_semver/pub_semver.dart';
 
 const libgit2Version = '1.5.0';
 final libDir = path.join('.dart_tool', 'libgit2');
@@ -25,6 +26,20 @@ String getLibName() {
   return 'libgit2-$libgit2Version.$ext';
 }
 
+/// Returns location of the most recent verison of the libgit2dart package
+/// contained in the cache.
+String? checkCache() {
+  final cache = json.decode(
+    Process.runSync('dart', ['pub', 'cache', 'list']).stdout as String,
+  ) as Map<String, dynamic>;
+  final packages = cache['packages'] as Map<String, dynamic>;
+  final libPackages = packages['libgit2dart'] as Map<String, dynamic>?;
+  final versions = libPackages?.keys.map((e) => Version.parse(e)).toList();
+  final latestVersion = libPackages?[Version.primary(versions!).toString()]
+      as Map<String, dynamic>?;
+  return latestVersion?['location'] as String?;
+}
+
 /// Checks if [File]/[Link] exists for [path].
 bool _doesFileExist(String path) {
   return File(path).existsSync() || Link(path).existsSync();
@@ -65,16 +80,10 @@ String? _resolveLibPath(String name) {
     }
   }
 
-  String checkCache(PubCache pubCache) {
-    final pubCacheDir =
-        pubCache.getLatestVersion('libgit2dart')!.resolve()!.location;
-    return path.join(pubCacheDir.path, Platform.operatingSystem, name);
-  }
-
-  // If lib is in Flutter's '.pub_cache' folder.
-  final env = Platform.environment;
-  if (env.containsKey('FLUTTER_ROOT')) {
-    libPath = checkCache(PubCache());
+  // If lib is in '.pub_cache' folder.
+  final cachedLocation = checkCache();
+  if (cachedLocation != null) {
+    libPath = path.join(cachedLocation, Platform.operatingSystem, name);
     if (_doesFileExist(libPath)) return libPath;
   }
 

pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
   ffi: ^2.0.0
   meta: ^1.7.0
   path: ^1.8.1
-  pub_cache: ^0.3.1
+  pub_semver: ^2.1.3
 
 dev_dependencies:
   ffigen: ^6.0.1