Start inverting GN reading .gypis to GYP reading .gnis.
This canaries the idea by converting gyp/pdf.gypi to gn/pdf.gni.
If this lands and rolls quietly, I'll flesh out the rest.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3972
Change-Id: Iecaf1ccce7891679904c585946272bfb25eea299
Reviewed-on: https://skia-review.googlesource.com/3972
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/gyp/read_gni.py b/gyp/read_gni.py
new file mode 100644
index 0000000..b8a7b39
--- /dev/null
+++ b/gyp/read_gni.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+#
+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import sys
+
+# We'll read a single named list of paths from a .gni file.
+gni, name = sys.argv[1:]
+
+# The .gni files we want to read are close enough to Python syntax
+# that we can use execfile() if we supply definitions for GN builtins.
+
+def get_path_info(path, kind):
+ assert kind == "abspath"
+ # While we want absolute paths in GN, GYP prefers relative paths.
+ return path
+
+builtins = {
+ 'get_path_info': get_path_info,
+}
+definitions = {}
+execfile(gni, builtins, definitions)
+
+# definitions now holds all the values defined in the .gni.
+paths = definitions[name]
+
+# Perform any string substitutions.
+for var in definitions:
+ if type(definitions[var]) is str:
+ paths = [ p.replace('$'+var, definitions[var]) for p in paths ]
+
+# Print the path list, to be received by <!@ syntax in GYP.
+for p in paths:
+ print p