Roll Chrome into Mojo.

tools/vim/ninja_output.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 
 import os
 import os.path
+import re
 
 
 def GetNinjaOutputDirectory(chrome_root, configuration=None):
   """Returns <chrome_root>/<output_dir>/(Release|Debug).
 
+  The output_dir is detected in the following ways, in order of precedence:
+  1. CHROMIUM_OUT_DIR environment variable.
+  2. GYP_GENERATOR_FLAGS environment variable output_dir property.
+  3. Symlink target, if src/out is a symlink.
+  4. Most recently modified (e.g. built) directory called out or out_*.
+
   The configuration chosen is the one most recently generated/built, but can be
-  overriden via the <configuration> parameter. Detects a custom output_dir
-  specified by GYP_GENERATOR_FLAGS."""
+  overriden via the <configuration> parameter."""
 
-  output_dir = 'out'
-  generator_flags = os.getenv('GYP_GENERATOR_FLAGS', '').split(' ')
-  for flag in generator_flags:
-    name_value = flag.split('=', 1)
-    if len(name_value) == 2 and name_value[0] == 'output_dir':
-      output_dir = name_value[1]
+  output_dirs = []
+  if ('CHROMIUM_OUT_DIR' in os.environ and
+      os.path.isdir(os.path.join(chrome_root, os.environ['CHROMIUM_OUT_DIR']))):
+    output_dirs = [os.environ['CHROMIUM_OUT_DIR']]
+  if not output_dirs:
+    generator_flags = os.getenv('GYP_GENERATOR_FLAGS', '').split(' ')
+    for flag in generator_flags:
+      name_value = flag.split('=', 1)
+      if (len(name_value) == 2 and name_value[0] == 'output_dir' and
+          os.path.isdir(os.path.join(chrome_root, name_value[1]))):
+        output_dirs = [name_value[1]]
+  if not output_dirs:
+    out = os.path.join(chrome_root, 'out')
+    if os.path.islink(out):
+      out_target = os.path.join(os.path.dirname(out), os.readlink(out))
+      if os.path.exists(out_target):
+        output_dirs = [out_target]
+  if not output_dirs:
+    for f in os.listdir(chrome_root):
+      if (re.match('out(?:$|_)', f) and
+          os.path.isdir(os.path.join(chrome_root, f))):
+        output_dirs.append(f)
 
-  root = os.path.join(chrome_root, output_dir)
-  if configuration:
-    return os.path.join(root, configuration)
+  configs = [configuration] if configuration else ['Debug', 'Release']
+  output_paths = [os.path.join(chrome_root, out_dir, config)
+                  for out_dir in output_dirs for config in configs]
 
-  debug_path = os.path.join(root, 'Debug')
-  release_path = os.path.join(root, 'Release')
+  def approx_directory_mtime(path):
+    if not os.path.exists(path):
+      return -1
+    # This is a heuristic; don't recurse into subdirectories.
+    paths = [path] + [os.path.join(path, f) for f in os.listdir(path)]
+    return max(os.path.getmtime(p) for p in paths)
 
-  def is_release_15s_newer(test_path):
-    try:
-      debug_mtime = os.path.getmtime(os.path.join(debug_path, test_path))
-    except os.error:
-      debug_mtime = 0
-    try:
-      rel_mtime = os.path.getmtime(os.path.join(release_path, test_path))
-    except os.error:
-      rel_mtime = 0
-    return rel_mtime - debug_mtime >= 15
-
-  if is_release_15s_newer('build.ninja') or is_release_15s_newer('protoc'):
-    return release_path
-  return debug_path
+  return max(output_paths, key=approx_directory_mtime)