Add self tests for gyp_to_android.

platform_tools/android/bin/gyp_to_android.py

Index: platform_tools/android/bin/gyp_to_android.py
diff --git a/platform_tools/android/bin/gyp_to_android.py b/platform_tools/android/bin/gyp_to_android.py
index ee1f86ef823f0647cf1e7d6603382dfdf0f153ba..dafd42b7af8c0989dc62391d7c56a05c146b8eac 100644
--- a/platform_tools/android/bin/gyp_to_android.py
+++ b/platform_tools/android/bin/gyp_to_android.py
@@ -11,6 +11,8 @@ files.
 """
 
 import os
+import shutil
+import tempfile
 
 # Folder containing all gyp files and generated gypd files.
 GYP_FOLDER = 'gyp'
@@ -141,9 +143,11 @@ DEBUGGING_HELP = (
 """
 )
 
-def WriteAndroidMk(common, arm, armNeon, x86, default):
+def WriteAndroidMk(target_dir, common, arm, armNeon, x86, default):
   """
   Given all the variables, write the final make file.
+  @param target_dir The full path to the directory to write Android.mk, or None
+                    to use the current working directory.
   @param common VarsDict holding variables definitions common to all
                 configurations.
   @param arm VarsDict holding variable definitions unique to arm. Will be
@@ -158,7 +162,10 @@ def WriteAndroidMk(common, arm, armNeon, x86, default):
                  without custom optimizations.
   TODO: Add mips.
   """
-  with open('Android.mk', 'w') as f:
+  target_file = 'Android.mk'
+  if target_dir:
+    target_file = os.path.join(target_dir, target_file)
+  with open(target_file, 'w') as f:
     f.write(AUTOGEN_WARNING)
     f.write('BASE_PATH := $(call my-dir)\n')
     f.write('LOCAL_PATH:= $(call my-dir)\n')
@@ -354,79 +361,100 @@ def Intersect(var_dict_list):
           var_dict[key].remove(item)
   return intersection
 
-def CleanGypdFiles():
+def CleanGypdFiles(folder):
   """
   Remove the gypd files generated by android_framework_gyp.main().
+  @param folder Folder in which to delete all files ending with 'gypd'.
   """
-  assert os.path.isdir(GYP_FOLDER)
-  files = os.listdir(GYP_FOLDER)
+  assert os.path.isdir(folder)
+  files = os.listdir(folder)
   for f in files:
     if f.endswith('gypd'):
-      os.remove(os.path.join(GYP_FOLDER, f))
+      os.remove(os.path.join(folder, f))
 
 import android_framework_gyp
 
-def main():
+def main(target_dir=None):
+  """
+  Read gyp files and create Android.mk for the Android framework's
+  external/skia.
+  @param target_dir Directory in which to place 'Android.mk'. If None, the file
+                    will be placed in skia's root directory.
+  """
   # Move up to top of trunk
-  script_dir = os.path.dirname(__file__)
+  script_dir = os.path.abspath(os.path.dirname(__file__))
   skia_dir = os.path.normpath(os.path.join(script_dir, os.pardir, os.pardir,
                                            os.pardir))
-  os.chdir(skia_dir)
-
-  main_gypd_file = os.path.join(GYP_FOLDER, 'android_framework_lib.gypd')
-
-  print 'Creating Android.mk',
-
-  # Call the script to generate gypd files, first using a non-existant archtype.
-  android_framework_gyp.main('other', False)
-  # And store its variables in the default dict
-  default_var_dict = VarsDict()
-  ParseGypd(default_var_dict, main_gypd_file)
-  CleanGypdFiles()
-
-  print '.',
-
-  # Now do the same for Arm. arm_var_dict will contain all the variable
-  # definitions needed to build with arm (meaning that it will share most
-  # with default_var_dict).
-  android_framework_gyp.main('arm', False)
-  arm_var_dict = VarsDict()
-  ParseGypd(arm_var_dict, main_gypd_file)
-  CleanGypdFiles()
-
-  print '.',
-
-  # Now do the same for Arm/Neon.
-  android_framework_gyp.main('arm', True)
-  arm_neon_var_dict = VarsDict()
-  ParseGypd(arm_neon_var_dict, main_gypd_file)
-  CleanGypdFiles()
-
-  print '.'
-
-  # Now do the same for x86.
-  x86_var_dict = VarsDict()
-  if INCLUDE_X86_OPTS:
-    android_framework_gyp.main('x86', False)
-    ParseGypd(x86_var_dict, main_gypd_file)
-    CleanGypdFiles()
-
-  # Compute the intersection of all targets. All the files in the intersection
-  # should be part of the makefile always. Each dict will now contain trimmed
-  # lists containing only variable definitions specific to that configuration.
-  var_dict_list = [default_var_dict, arm_var_dict, arm_neon_var_dict]
-  if INCLUDE_X86_OPTS:
-    var_dict_list.append(x86_var_dict)
-  common = Intersect(var_dict_list)
-
-  # Further trim arm_neon_var_dict with arm_var_dict. After this call,
-  # arm_var_dict (which will now be the intersection) includes all definitions
-  # used by both arm and arm + neon, and arm_neon_var_dict will only contain
-  # those specific to arm + neon.
-  arm_var_dict = Intersect([arm_var_dict, arm_neon_var_dict])
-
-  WriteAndroidMk(common, arm_var_dict, arm_neon_var_dict, x86_var_dict,
-                 default_var_dict)
+  # Create a temporary folder to hold gyp and gypd files. Create it in skia_dir
+  # so that it is a sibling of gyp/, so the relationships between gyp files and
+  # other files (e.g. platform_tools/android/gyp/dependencies.gypi, referenced
+  # by android_deps.gyp as a relative path) is unchanged.
+  # Use mkdtemp to find an unused folder name, but then delete it so copytree
+  # can be called with a non-existent directory.
+  tmp_folder = tempfile.mkdtemp(dir=skia_dir)
+  os.rmdir(tmp_folder)
+  shutil.copytree(os.path.join(skia_dir, GYP_FOLDER), tmp_folder)
+
+  try:
+    main_gyp_file = 'android_framework_lib.gyp'
+    main_gypd_file = os.path.join(tmp_folder, main_gyp_file + 'd')
+
+    print 'Creating Android.mk',
+
+    # Call the script to generate gypd files, first using a non-existant
+    # archtype.
+    android_framework_gyp.main(tmp_folder, main_gyp_file, 'other', False)
+    # And store its variables in the default dict
+    default_var_dict = VarsDict()
+    ParseGypd(default_var_dict, main_gypd_file)
+    CleanGypdFiles(tmp_folder)
+
+    print '.',
+
+    # Now do the same for Arm. arm_var_dict will contain all the variable
+    # definitions needed to build with arm (meaning that it will share most
+    # with default_var_dict).
+    android_framework_gyp.main(tmp_folder, main_gyp_file, 'arm', False)
+    arm_var_dict = VarsDict()
+    ParseGypd(arm_var_dict, main_gypd_file)
+    CleanGypdFiles(tmp_folder)
+
+    print '.',
+
+    # Now do the same for Arm/Neon.
+    android_framework_gyp.main(tmp_folder, main_gyp_file, 'arm', True)
+    arm_neon_var_dict = VarsDict()
+    ParseGypd(arm_neon_var_dict, main_gypd_file)
+    CleanGypdFiles(tmp_folder)
+
+    print '.'
+
+    # Now do the same for x86.
+    x86_var_dict = VarsDict()
+    if INCLUDE_X86_OPTS:
+      android_framework_gyp.main(tmp_folder, main_gyp_file, 'x86', False)
+      ParseGypd(x86_var_dict, main_gypd_file)
+      CleanGypdFiles(tmp_folder)
+
+    # Compute the intersection of all targets. All the files in the intersection
+    # should be part of the makefile always. Each dict will now contain trimmed
+    # lists containing only variable definitions specific to that configuration.
+    var_dict_list = [default_var_dict, arm_var_dict, arm_neon_var_dict]
+    if INCLUDE_X86_OPTS:
+      var_dict_list.append(x86_var_dict)
+    common = Intersect(var_dict_list)
+
+    # Further trim arm_neon_var_dict with arm_var_dict. After this call,
+    # arm_var_dict (which will now be the intersection) includes all definitions
+    # used by both arm and arm + neon, and arm_neon_var_dict will only contain
+    # those specific to arm + neon.
+    arm_var_dict = Intersect([arm_var_dict, arm_neon_var_dict])
+
+    WriteAndroidMk(target_dir, common, arm_var_dict, arm_neon_var_dict,
+                   x86_var_dict, default_var_dict)
+
+  finally:
+    shutil.rmtree(tmp_folder)
 
 if __name__ == '__main__':
   main()