Use stdlibc package for stating the file

This way we get all the parameters such as inode and all. The Dart
standard library sucks and doesn't provide us the most basic
functionality.

Author: vHanda

lib/checkout.dart

@@ -1,5 +1,6 @@
 import 'package:file/file.dart';
 import 'package:path/path.dart' as p;
+import 'package:stdlibc/stdlibc.dart' as stdlibc;
 
 import 'package:dart_git/dart_git.dart';
 import 'package:dart_git/diff_commit.dart';
@@ -131,7 +132,7 @@ extension Checkout on GitRepository {
         fs.file(filePath).writeAsBytesSync(blobObj.blobData);
         fs.file(filePath).chmodSync(change.to!.mode.val);
 
-        var stat = fs.file(filePath).statSync();
+        var stat = stdlibc.stat(filePath)!;
         index.updatePath(to.path, to.hash, stat);
       } else if (change.delete) {
         var from = change.from!;

lib/index.dart

@@ -1,5 +1,6 @@
 import 'package:file/file.dart';
 import 'package:path/path.dart' as p;
+import 'package:stdlibc/stdlibc.dart' as stdlibc;
 
 import 'package:dart_git/dart_git.dart';
 import 'package:dart_git/exceptions.dart';
@@ -44,12 +45,14 @@ extension Index on GitRepository {
     // LB: Wait is this a linear search over all files??
     //     Maybe... but omitting it fully does not speed things up.
     var ei = index.entries.indexWhere((e) => e.path == pathSpec);
-    var stat = FileStat.statSync(filePath);
+    var stat = stdlibc.stat(filePath)!;
     if (ei != -1) {
       var entry = index.entries[ei];
-      if (entry.cTime.isAtSameMomentAs(stat.changed) &&
-          entry.mTime.isAtSameMomentAs(stat.modified) &&
-          entry.fileSize == stat.size) {
+      if (entry.cTime.isAtSameMomentAs(stat.st_ctim) &&
+          entry.mTime.isAtSameMomentAs(stat.st_mtim) &&
+          entry.ino == stat.st_ino &&
+          entry.dev == stat.st_dev &&
+          entry.fileSize == stat.st_size) {
         // We assume it is the same file.
         return entry;
       }
@@ -61,14 +64,11 @@ extension Index on GitRepository {
 
     // Existing file
     if (ei != -1) {
-      assert(data.length == stat.size);
-
-      var newEntry = index.entries[ei].copyWith(
-        hash: hash,
-        fileSize: data.length,
-        cTime: stat.changed,
-        mTime: stat.modified,
-      );
+      assert(data.length == stat.st_size);
+
+      var hash = index.entries[ei].hash;
+      var path = index.entries[ei].path;
+      var newEntry = GitIndexEntry.fromFS(path, stat, hash);
       index.entries[ei] = newEntry;
       return newEntry;
     }

lib/plumbing/index.dart

@@ -6,6 +6,7 @@ import 'package:buffer/buffer.dart';
 import 'package:charcode/charcode.dart';
 import 'package:collection/collection.dart';
 import 'package:equatable/equatable.dart';
+import 'package:stdlibc/stdlibc.dart' as stdlibc;
 
 import 'package:dart_git/exceptions.dart';
 import 'package:dart_git/plumbing/git_hash.dart';
@@ -207,7 +208,7 @@ class GitIndex {
 
   static final _listEq = const ListEquality().equals;
 
-  void updatePath(String path, GitHash hash, FileStat stat) {
+  void updatePath(String path, GitHash hash, stdlibc.Stat stat) {
     var ei = entries.indexWhere((e) => e.path == path);
     if (ei == -1) {
       var entry = GitIndexEntry.fromFS(path, stat, hash);
@@ -216,13 +217,7 @@ class GitIndex {
     }
 
     // Existing file
-    var entry = entries[ei];
-    entries[ei] = entry.copyWith(
-      fileSize: stat.size,
-      hash: hash,
-      cTime: stat.changed,
-      mTime: stat.modified,
-    );
+    entries[ei] = GitIndexEntry.fromFS(path, stat, hash);
   }
 
   GitHash? removePath(String pathSpec) {
@@ -279,87 +274,20 @@ class GitIndexEntry {
     this.intentToAdd = false,
   });
 
-  GitIndexEntry copyWith({
-    DateTime? cTime,
-    DateTime? mTime,
-    int? dev,
-    int? ino,
-    GitFileMode? mode,
-    int? uid,
-    int? gid,
-    int? fileSize,
-    GitHash? hash,
-    GitFileStage? stage,
-    String? path,
-    bool? skipWorkTree,
-    bool? intentToAdd,
-  }) {
-    return GitIndexEntry(
-      cTime: cTime ?? this.cTime,
-      mTime: mTime ?? this.mTime,
-      dev: dev ?? this.dev,
-      ino: ino ?? this.ino,
-      mode: mode ?? this.mode,
-      uid: uid ?? this.uid,
-      gid: gid ?? this.gid,
-      fileSize: fileSize ?? this.fileSize,
-      hash: hash ?? this.hash,
-      stage: stage ?? this.stage,
-      path: path ?? this.path,
-      skipWorkTree: skipWorkTree ?? this.skipWorkTree,
-      intentToAdd: intentToAdd ?? this.intentToAdd,
-    );
-  }
-
-  static GitIndexEntry fromFS(String path, FileStat stat, GitHash hash) {
-    var cTime = stat.changed;
-    var mTime = stat.modified;
-
-    if (stat.mode == 0) {
-      throw Exception('Invalid FileMode: ${stat.mode}');
-    }
-    var mode = GitFileMode(stat.mode);
-
-    // These don't seem to be exposed in Dart
-    var ino = 0;
-    var dev = 0;
-
-    switch (stat.type) {
-      case FileSystemEntityType.file:
-        mode = stat.mode == GitFileMode.Executable.val
-            ? GitFileMode.Executable
-            : GitFileMode.Regular;
-      case FileSystemEntityType.directory:
-        mode = GitFileMode.Dir;
-      case FileSystemEntityType.link:
-        mode = GitFileMode.Symlink;
-      case FileSystemEntityType.notFound:
-        throw Exception('Invalid FileType: ${stat.type}');
-      case FileSystemEntityType.pipe:
-        throw Exception('Invalid FileType: ${stat.type}');
-      case FileSystemEntityType.unixDomainSock:
-        throw Exception('Invalid FileType: ${stat.type}');
-    }
-
-    // FIXME: uid, gid don't seem accessible in Dart -https://github.com/dart-lang/sdk/issues/15078
-    var uid = 0;
-    var gid = 0;
-
-    var fileSize = stat.size;
-    var stage = GitFileStage(0);
-
+  static GitIndexEntry fromFS(String path, stdlibc.Stat stat, GitHash hash) {
     assert(!path.startsWith('/'));
+
     return GitIndexEntry(
-      cTime: cTime,
-      mTime: mTime,
-      dev: dev,
-      ino: ino,
-      mode: mode,
-      uid: uid,
-      gid: gid,
-      fileSize: fileSize,
+      cTime: stat.st_ctim,
+      mTime: stat.st_mtim,
+      dev: stat.st_dev,
+      ino: stat.st_ino,
+      mode: GitFileMode(stat.st_mode),
+      uid: stat.st_uid,
+      gid: stat.st_gid,
+      fileSize: stat.st_size,
       hash: hash,
-      stage: stage,
+      stage: GitFileStage(0),
       path: path,
     );
   }

pubspec.yaml

@@ -18,6 +18,7 @@ dependencies:
   file: ^7.0.0
   meta: ^1.8.0
   path: ^1.8.2
+  stdlibc: ^0.1.4
   synchronized: ^3.0.1
   tuple: ^2.0.1