Handle parsing the "version" file better.

utils/tests/pub/command_line_config.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library command_line_config;
 
 import 'dart:io';
 
+import '../../../pkg/path/lib/path.dart' as path;
 import '../../../pkg/unittest/lib/unittest.dart';
 import '../../pub/utils.dart';
 
 const _GREEN = '\u001b[32m';
 const _RED = '\u001b[31m';
 const _MAGENTA = '\u001b[35m';
 const _NONE = '\u001b[0m';
 
 /// Pretty Unicode characters!
 const _CHECKBOX = '\u2713';
@@ skipping 44 matching lines @@
     }
   }
 
   void onDone(bool success) {
     if (!success) exit(1);
   }
 
   void _printStackTrace(String stackTrace) {
     if (stackTrace == null || stackTrace == '') return;
 
+    print('');
+
     // Parse out each stack entry.
     var stack = [];
     for (var line in stackTrace.split('\n')) {
       if (line.trim() == '') continue;
       stack.add(new _StackFrame(line));
     }
 
     if (stack.length == 0) return;
 
-    // Find the common prefixes of the paths.
-    var common = 0;
-    while (true) {
-      var matching = true;
-      var c;
-      for (var frame in stack) {
-        if (frame.isCore) continue;
-        if (c == null) c = frame.library[common];
-
-        if (frame.library.length <= common || frame.library[common] != c) {
-          matching = false;
-          break;
-        }
-      }
-
-      if (!matching) break;
-      common++;
-    }
-
-    // Remove them.
-    if (common > 0) {
-      for (var frame in stack) {
-        if (frame.isCore) continue;
-        frame.library = frame.library.substring(common);
-      }
-    }
-
     // Figure out the longest path so we know how much to pad.
     int longest = stack.mappedBy((frame) => frame.location.length).max();
 
     // Print out the stack trace nicely formatted.
     for (var frame in stack) {
       print('  ${_padLeft(frame.location, longest)}  ${frame.member}');
     }
 
     print('');
   }
@@ skipping 12 matching lines @@
 
   String _indent(String str) {
     // TODO(nweiz): Use this simpler code once issue 2980 is fixed.
     // return str.replaceAll(new RegExp("^", multiLine: true), "  ");
     return Strings.join(str.split("\n").mappedBy((line) => "  $line"), "\n");
   }
 }
 
 class _StackFrame {
   static final fileRegExp = new RegExp(
-      r'#\d+\s+(.*) \((file:///.+):(\d+):(\d+)\)');
+      r'#\d+\s+(.*) \(file://(/.+):(\d+):(\d+)\)');
   static final coreRegExp = new RegExp(r'#\d+\s+(.*) \((.+):(\d+):(\d+)\)');
 
   /// If `true`, then this stack frame is for a library built into Dart and
   /// not a regular file path.
   final bool isCore;
 
   /// The path to the library or the library name if a core library.
   String library;
 
   /// The line number.
@@ skipping 13 matching lines @@
   factory _StackFrame(String text) {
     var match = fileRegExp.firstMatch(text);
     var isCore = false;
 
     if (match == null) {
       match = coreRegExp.firstMatch(text);
       if (match == null) throw "Couldn't parse stack trace line '$text'.";
       isCore = true;
     }
 
+    var library = match[2];
+    if (!isCore) {
+      // Make the library path relative to the entrypoint.
+      library = path.relative(library);
+    }
+
     var member = match[1].replaceAll("<anonymous closure>", _LAMBDA);
-    return new _StackFrame._(isCore, match[2], match[3], match[4], member);
+    return new _StackFrame._(isCore, library, match[3], match[4], member);
   }
 }