Add directory extraction to GN path handling.

Some of the mojo templates want to put generated files in the directory
corresponding to the source file, rather than the directory containing the
BUILD file. Previously, this required putting the BUILD files in the same
directory.

This patch adds the ability to specify the generated file directory
corresponding to the input file in the action_foreach file templates so this
can be expressed naturally.

For parity, it also adds qquerying for this information via get_path_info.

BUG=
R=cjhopman@chromium.org

Review URL: https://codereview.chromium.org/334333005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278402 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 20 insertions, 2 deletions

diff --git a/tools/gn/function_process_file_template.cc b/tools/gn/function_process_file_template.cc
index 5d4c9d7..061c901 100644
--- a/tools/gn/function_process_file_template.cc
+++ b/tools/gn/function_process_file_template.cc
@@ -5,6 +5,10 @@
 #include "tools/gn/file_template.h"
 #include "tools/gn/functions.h"
 #include "tools/gn/parse_tree.h"
+#include "tools/gn/scope.h"
+#include "tools/gn/settings.h"
+#include "tools/gn/target.h"
+#include "tools/gn/value_extractors.h"
 
 namespace functions {
 
@@ -67,12 +71,26 @@ Value RunProcessFileTemplate(Scope* scope,
     return Value();
   }
 
-  FileTemplate file_template(args[1], err);
+  FileTemplate file_template(scope->settings(), args[1], err);
   if (err->has_error())
     return Value();
 
+  Target::FileList input_files;
+  if (!ExtractListOfRelativeFiles(scope->settings()->build_settings(), args[0],
+                                  scope->GetSourceDir(), &input_files, err))
+    return Value();
+
   Value ret(function, Value::LIST);
-  file_template.Apply(args[0], function, &ret.list_value(), err);
+
+  // Temporary holding place, allocate outside to re-use buffer.
+  std::vector<std::string> string_output;
+
+  for (size_t i = 0; i < input_files.size(); i++) {
+    string_output.clear();
+    file_template.Apply(input_files[i], &string_output);
+    for (size_t out_i = 0; out_i < string_output.size(); out_i++)
+      ret.list_value().push_back(Value(function, string_output[out_i]));
+  }
   return ret;
 }