Revert "Simplify path handling logic in dependency checker and devFS (#8414)" (#8467)

This reverts commit e7bde11c.

Reason: broke hot reload when using "package:" style imports for sources
within the same project.

bin/internal/engine.version

-0edcbb7db427e4fcaff23308ea95f9aec0ebb432
+eaacbf5f6f8f7f0be4cec64babc777816c68dd44

packages/flutter_tools/lib/src/dart/dependencies.dart

@@ -5,6 +5,7 @@
 import 'dart:convert';
 
 import '../artifacts.dart';
+import '../base/file_system.dart';
 import '../base/process.dart';
 
 class DartDependencySetBuilder {
@@ -29,6 +30,16 @@ class DartDependencySetBuilder {
 
     String output = runSyncAndThrowStdErrOnError(args);
 
-    return new Set<String>.from(LineSplitter.split(output));
+    final List<String> lines = LineSplitter.split(output).toList();
+    final Set<String> minimalDependencies = new Set<String>();
+    for (String line in lines) {
+      if (!line.startsWith('package:')) {
+        // We convert the uris so that they are relative to the project
+        // root.
+        line = fs.path.relative(line, from: projectRootPath);
+      }
+      minimalDependencies.add(line);
+    }
+    return minimalDependencies;
   }
 }

packages/flutter_tools/lib/src/dependency_checker.dart

@@ -5,6 +5,7 @@
 import 'asset.dart';
 import 'base/file_system.dart';
 import 'dart/dependencies.dart';
+import 'dart/package_map.dart';
 import 'globals.dart';
 
 class DependencyChecker {
@@ -17,7 +18,10 @@ class DependencyChecker {
   /// if it cannot be determined.
   bool check(DateTime threshold) {
     _dependencies.clear();
+    PackageMap packageMap;
+    // Parse the package map.
     try {
+      packageMap = new PackageMap(builder.packagesFilePath)..load();
       _dependencies.add(builder.packagesFilePath);
     } catch (e, st) {
       printTrace('DependencyChecker: could not parse .packages file:\n$e\n$st');
@@ -25,7 +29,16 @@ class DependencyChecker {
     }
     // Build the set of Dart dependencies.
     try {
-      _dependencies.addAll(builder.build());
+      Set<String> dependencies = builder.build();
+      for (String path in dependencies) {
+        // Ensure all paths are absolute.
+        if (path.startsWith('package:')) {
+          path = packageMap.pathForPackage(Uri.parse(path));
+        } else {
+          path = fs.path.join(builder.projectRootPath, path);
+        }
+        _dependencies.add(path);
+      }
     } catch (e, st) {
       printTrace('DependencyChecker: error determining .dart dependencies:\n$e\n$st');
       return true;

packages/flutter_tools/lib/src/devfs.dart

@@ -461,10 +461,10 @@ class DevFS {
   }
 
   bool _shouldIgnore(String devicePath) {
-    List<String> ignoredPrefixes = <String>['android' + fs.path.separator,
+    List<String> ignoredPrefixes = <String>['android/',
                                             getBuildDirectory(),
-                                            'ios' + fs.path.separator,
-                                            '.pub' + fs.path.separator];
+                                            'ios/',
+                                            '.pub/'];
     for (String ignoredPrefix in ignoredPrefixes) {
       if (devicePath.startsWith(ignoredPrefix))
         return true;
@@ -473,14 +473,16 @@ class DevFS {
   }
 
   Future<bool> _scanDirectory(Directory directory,
-                              {String directoryNameOnDevice,
+                              {String directoryName,
                                bool recursive: false,
                                bool ignoreDotFiles: true,
+                               String packagesDirectoryName,
                                Set<String> fileFilter}) async {
-    if (directoryNameOnDevice == null) {
-      directoryNameOnDevice = fs.path.relative(directory.path, from: rootDirectory.path);
-      if (directoryNameOnDevice == '.')
-        directoryNameOnDevice = '';
+    String prefix = directoryName;
+    if (prefix == null) {
+      prefix = fs.path.relative(directory.path, from: rootDirectory.path);
+      if (prefix == '.')
+        prefix = '';
     }
     try {
       Stream<FileSystemEntity> files =
@@ -506,8 +508,24 @@ class DevFS {
         }
         final String relativePath =
             fs.path.relative(file.path, from: directory.path);
-        final String devicePath = fs.path.join(directoryNameOnDevice, relativePath);
-        if ((fileFilter != null) && !fileFilter.contains(file.absolute.path)) {
+        final String devicePath = fs.path.join(prefix, relativePath);
+        bool filtered = false;
+        if ((fileFilter != null) &&
+            !fileFilter.contains(devicePath)) {
+          if (packagesDirectoryName != null) {
+            // Double check the filter for packages/packagename/
+            final String packagesDevicePath =
+                fs.path.join(packagesDirectoryName, relativePath);
+            if (!fileFilter.contains(packagesDevicePath)) {
+              // File was not in the filter set.
+              filtered = true;
+            }
+          } else {
+            // File was not in the filter set.
+            filtered = true;
+          }
+        }
+        if (filtered) {
           // Skip files that are not included in the filter.
           continue;
         }
@@ -530,26 +548,27 @@ class DevFS {
     PackageMap packageMap = new PackageMap(_packagesFilePath);
 
     for (String packageName in packageMap.map.keys) {
-      Uri packageUri = packageMap.map[packageName];
-      String packagePath = fs.path.fromUri(packageUri);
-      Directory packageDirectory = fs.directory(packageUri);
-      String directoryNameOnDevice = fs.path.join('packages', packageName);
-      bool packageExists;
-
-      if (fs.path.isWithin(rootDirectory.path, packagePath)) {
-        // We already scanned everything under the root directory.
-        packageExists = packageDirectory.existsSync();
-        directoryNameOnDevice = fs.path.relative(packagePath, from: rootDirectory.path);
-      } else {
-        packageExists =
-            await _scanDirectory(packageDirectory,
-                                 directoryNameOnDevice: directoryNameOnDevice,
-                                 recursive: true,
-                                 fileFilter: fileFilter);
-      }
+      Uri uri = packageMap.map[packageName];
+      // This project's own package.
+      final bool isProjectPackage = uri.toString() == 'lib/';
+      final String directoryName =
+          isProjectPackage ? 'lib' : fs.path.join('packages', packageName);
+      // If this is the project's package, we need to pass both
+      // package:<package_name> and lib/ as paths to be checked against
+      // the filter because we must support both package: imports and relative
+      // path imports within the project's own code.
+      final String packagesDirectoryName =
+          isProjectPackage ? fs.path.join('packages', packageName) : null;
+      Directory directory = fs.directory(uri);
+      bool packageExists =
+          await _scanDirectory(directory,
+                               directoryName: directoryName,
+                               recursive: true,
+                               packagesDirectoryName: packagesDirectoryName,
+                               fileFilter: fileFilter);
       if (packageExists) {
         sb ??= new StringBuffer();
-        sb.writeln('$packageName:$directoryNameOnDevice');
+        sb.writeln('$packageName:$directoryName');
       }
     }
     if (sb != null) {

packages/flutter_tools/lib/src/run_hot.dart

@@ -98,7 +98,18 @@ class HotRunner extends ResidentRunner {
         new DartDependencySetBuilder(
               mainPath, projectRootPath, packagesFilePath);
     try {
-      _dartDependencies = new Set<String>.from(dartDependencySetBuilder.build());
+      Set<String> dependencies = dartDependencySetBuilder.build();
+      _dartDependencies = new Set<String>();
+      for (String path in dependencies) {
+        // We need to tweak package: uris so that they reflect their devFS
+        // location.
+        if (path.startsWith('package:')) {
+          // Swap out package: for packages/ because we place all package
+          // sources under packages/.
+          path = path.replaceFirst('package:', 'packages/');
+        }
+        _dartDependencies.add(path);
+      }
     } catch (error) {
       printStatus('Error detected in application source code:', emphasis: true);
       printError('$error');

packages/flutter_tools/test/dart_dependencies_test.dart

@@ -21,8 +21,8 @@ void main()  {
       DartDependencySetBuilder builder =
           new DartDependencySetBuilder(mainPath, testPath, packagesPath);
       Set<String> dependencies = builder.build();
-      expect(dependencies.contains(mainPath), isTrue);
-      expect(dependencies.contains(fs.path.join(testPath, 'foo.dart')), isTrue);
+      expect(dependencies.contains('main.dart'), isTrue);
+      expect(dependencies.contains('foo.dart'), isTrue);
     });
     testUsingContext('syntax_error', () {
       final String testPath = fs.path.join(dataPath, 'syntax_error');