Improve CLI interface of C++ enums to Java generator

build/config/android/rules.gni

Index: build/config/android/rules.gni
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
index 021a7a04f2498077cb6b2407861df0365d460578..4e74e88c0bc1c58d94e095cb393bc20cbebb97a7 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -323,8 +323,8 @@ template("java_cpp_template") {
 #
 #   outputs: list of outputs, relative to the output_dir. These paths are
 #     verified at build time by the script. To get the list programatically run:
-#       python build/android/gyp/java_cpp_enum.py --output_dir=. \
-#         --print_output_only path/to/header/file.h
+#       python build/android/gyp/java_cpp_enum.py \
+#         --print_output_only . path/to/header/file.h
 #
 # Example
 #   java_cpp_enum("foo_generated_enum") {
@@ -351,16 +351,14 @@ template("java_cpp_enum") {
     outputs =
         get_path_info(rebase_path(invoker.outputs, ".", gen_dir), "abspath")
 
-    args = [
-      "--output_dir",
-      rebase_path(gen_dir, root_build_dir),
-    ]
+    args = []
     foreach(output, rebase_path(outputs, root_build_dir)) {
       args += [
         "--assert_file",
         output,
       ]
     }
+    args += rebase_path(gen_dir, root_build_dir)

[cjhopman, 2015/02/17 21:38:25]

gen_dir is a string (invoker.sources below is a list).

This should be:
args += [rebase_path(gen_dir, root_build_dir)]

or to look like the one below it:
args += rebase_path([gen_dir], root_build_dir)

[mnaganov (inactive), 2015/02/23 11:35:26]

I was supposing that gn can handle coercion itself. Fixed.

     args += rebase_path(invoker.sources, root_build_dir)
   }