closure: make tracking script cwd-independent.

R=vitalyp@chromium.org,tbreisacher@chromium.org
BUG=393873
TEST=cd third_party/closure_compiler && ./tools/compile_coverage.py
NOTRY=true

Review URL: https://codereview.chromium.org/507953002

Cr-Commit-Position: refs/heads/master@{#292204}

third_party/closure_compiler/tools/compile_coverage.py

@@ -7,16 +7,21 @@ from ast import literal_eval
 import os
 
 
+_HERE = os.path.dirname(__file__)
+_SRC_ROOT = os.path.join(_HERE, '..', '..', '..')
+_FROM_SRC = lambda p: os.path.abspath(os.path.join(_SRC_ROOT, p))
+
+
 # High priority code to compile.
-_NEED_TO_COMPILE = [
+_NEED_TO_COMPILE = map(_FROM_SRC, [
   'chrome/browser/resources',
   'chrome/browser/ui/webui',
   'ui/webui/resources/js',
-]
+])
 
 
 # Code that we'd eventually like to compile.
-_WANT_TO_COMPILE = [
+_WANT_TO_COMPILE = map(_FROM_SRC, [
   'chrome/renderer/resources',
   'chrome/test/data',
   'content/renderer/resources',
@@ -26,23 +31,27 @@ _WANT_TO_COMPILE = [
   'remoting',
   'ui/file_manager',
   'ui/keyboard',
-]
+])
 
 
-def main():
-  here = os.path.dirname(__file__)
-  src_root = os.path.join(here, '..', '..', '..')
+_GIT_IGNORE = open(_FROM_SRC('.gitignore')).read().splitlines()
+_IGNORE_DIRS = tuple(map(_FROM_SRC, map(lambda p: p[1:], _GIT_IGNORE)))
+_IGNORE_DIRS = filter(os.path.isdir, _IGNORE_DIRS)
+_RELEVANT_JS = lambda f: f.endswith('.js') and not f.startswith(_IGNORE_DIRS)
 
+
+def main():
   line_cache = {}
 
   def js_files_in_dir(js_dir):
     found_files = set()
     for root, dirs, files in os.walk(js_dir):
-      js = filter(lambda f: f.endswith('.js'), files)
-      found_files.update([os.path.abspath(os.path.join(root, f)) for f in js])
+      abs_files = [os.path.abspath(os.path.join(root, f)) for f in files]
+      found_files.update(filter(_RELEVANT_JS, abs_files))
     return found_files
 
   def num_lines(f):
+    f = os.path.abspath(f)
     if f not in line_cache:
       line_cache[f] = len(open(f, 'r').read().splitlines())
     return line_cache[f]
@@ -50,25 +59,23 @@ def main():
   # All the files that are already compiled.
   compiled = set()
 
-  closure_dir = os.path.join(here, '..')
+  closure_dir = os.path.join(_HERE, '..')
   root_gyp = os.path.join(closure_dir, 'compiled_resources.gyp')
   root_contents = open(root_gyp, 'r').read()
   gyp_files = literal_eval(root_contents)['targets'][0]['dependencies']
 
   for g in gyp_files:
-    src_to_closure = os.path.relpath(src_root, closure_dir)
-    rel_file = os.path.relpath(g.replace(':*', ''), src_to_closure)
-    abs_file = os.path.abspath(rel_file)
-    targets = literal_eval(open(abs_file, 'r').read())['targets']
+    gyp_file = os.path.join(closure_dir, g.replace(':*', ''))
+    targets = literal_eval(open(gyp_file, 'r').read())['targets']
 
     for target in targets:
-      abs_dir = os.path.dirname(abs_file)
-      target_file = os.path.join(abs_dir, target['target_name'] + '.js')
-      compiled.add(target_file)
+      gyp_dir = os.path.dirname(gyp_file)
+      target_file = os.path.join(gyp_dir, target['target_name'] + '.js')
+      compiled.add(os.path.abspath(target_file))
 
       if 'variables' in target and 'depends' in target['variables']:
         depends = target['variables']['depends']
-        rel_depends = [os.path.join(abs_dir, d) for d in depends]
+        rel_depends = [os.path.join(gyp_dir, d) for d in depends]
         compiled.update([os.path.abspath(d) for d in rel_depends])
 
   compiled_lines = sum(map(num_lines, compiled))
@@ -79,7 +86,7 @@ def main():
   files = set()
 
   for n in _NEED_TO_COMPILE:
-    files.update(js_files_in_dir(os.path.join(src_root, n)))
+    files.update(js_files_in_dir(n))
 
   need_lines = sum(map(num_lines, files))
   print 'need: %d files, %d lines' % (len(files), need_lines)
@@ -88,7 +95,7 @@ def main():
   print '%.2f%% done with the code we need to compile' % need_done
 
   for w in _WANT_TO_COMPILE:
-    files.update(js_files_in_dir(os.path.join(src_root, w)))
+    files.update(js_files_in_dir(w))
 
   want_lines = sum(map(num_lines, files))
   print 'want: %d files, %d lines' % (len(files), want_lines)