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# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# Runs the version processing script over the given template file to produce
# an output file. This is used for generating various forms of files that
# incorporate the product name and version.
#
# Unlike GYP, this will actually compile the resulting file, so you don't need
# to add it separately to the sources, just depend on the target.
#
# In GYP this is a rule that runs once per ".ver" file. In GN this just
# processes one file per invocation of the template so you may have to have
# multiple targets.
#
# Parameters:
# sources (optional):
# List of file names to read. When converting a GYP target, this should
# list the 'source' (see above) as well as any extra_variable_files.
# The files will be passed to version.py in the order specified here.
#
# output:
# File name of file to write. In GYP this is unspecified and it will
# make up a file name for you based on the input name, and tack on
# "_version.rc" to the end. But in GN you need to specify the full name.
#
# template_file (optional):
# Template file to use (not a list). Most Windows users that want to use
# this to process a .rc template should use process_version_rc_template(),
# defined in //chrome/process_version_rc_template.gni, instead.
#
# extra_args (optional):
# Extra arguments to pass to version.py. Any "-f <filename>" args should
# use sources instead.
#
# process_only (optional, defaults to false)
# Set to generate only one action that processes the version file and
# doesn't attempt to link the result into a source set. This is for if
# you are processing the version as data only.
#
# visibility (optional)
#
# Example:
# process_version("myversion") {
# sources = [
# "//chrome/VERSION"
# "myfile.h.in"
# ]
# output = "$target_gen_dir/myfile.h"
# extra_args = [ "-e", "FOO=42" ]
# }
template("process_version") {
assert(defined(invoker.output), "Output must be defined for $target_name")
process_only = defined(invoker.process_only) && invoker.process_only
if (process_only) {
action_name = target_name
} else {
action_name = target_name + "_action"
source_set_name = target_name
}
action(action_name) {
script = "//build/util/version.py"
inputs = []
if (defined(invoker.inputs)) {
inputs += invoker.inputs
}
if (defined(invoker.template_file)) {
inputs += [ invoker.template_file ]
}
outputs = [
invoker.output,
]
args = []
if (is_official_build) {
args += [ "--official" ]
}
if (defined(invoker.sources)) {
inputs += invoker.sources
foreach(i, invoker.sources) {
args += [
"-f",
rebase_path(i, root_build_dir),
]
}
}
if (defined(invoker.extra_args)) {
args += invoker.extra_args
}
args += [
"-o",
rebase_path(invoker.output, root_build_dir),
]
if (defined(invoker.template_file)) {
args += [ rebase_path(invoker.template_file, root_build_dir) ]
}
forward_variables_from(invoker, [ "deps" ])
if (process_only) {
# When processing only, visibility gets applied to this target.
forward_variables_from(invoker, [ "visibility" ])
} else {
# When linking the result, only the source set can depend on the action.
visibility = [ ":$source_set_name" ]
}
}
if (!process_only) {
source_set(source_set_name) {
forward_variables_from(invoker, [ "visibility" ])
sources = get_target_outputs(":$action_name")
public_deps = [
":$action_name",
]
}
}
}
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