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# Copyright 2020 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
import("//build_overrides/pigweed.gni")
# Defines an action that runs a Python script.
#
# This wraps a regular Python script GN action with an invocation of a script-
# runner script that adds useful features. pw_python_action() uses the same
# actions as GN's action(), with the following additions or changes:
#
# module May be used in place of the script argument to run the
# provided Python module with `python -m` instead of a script.
# Either script or module must be provided.
#
# capture_output If true, script output is hidden unless the script fails
# with an error. Defaults to true.
#
# stamp File to touch if the script is successful. Actions that
# don't create output files can use this stamp file instead of
# creating their own dummy file. If true, a generic file is
# used. If false or not set, no file is touched.
#
# directory The directory from which to execute the Python script. Paths
# in args may need to be adjusted to be relative to this
# directory.
#
# environment Environment variables to set, passed as a list of NAME=VALUE
# strings.
#
# args Same as the standard action args, except special expressions
# may be used to extract information not normally accessible
# in GN. These include the following:
#
# <TARGET_FILE(//some/label:here)> - expands to the
# output file (such as a .a or .elf) from a GN target
# <TARGET_FILE_IF_EXISTS(//some/label:here)> - expands to
# the output file if the target exists, or nothing
# <TARGET_OBJECTS(//some/label:here)> - expands to the
# object files produced by the provided GN target
#
template("pw_python_action") {
_script_args = [
# GN root directory relative to the build directory (in which the runner
# script is invoked).
"--gn-root",
rebase_path("//"),
# Current directory, used to resolve relative paths.
"--current-path",
rebase_path("."),
"--default-toolchain=$default_toolchain",
"--current-toolchain=$current_toolchain",
]
if (defined(invoker.directory)) {
_script_args += [
"--directory",
rebase_path(invoker.directory),
]
}
if (defined(invoker.environment)) {
foreach(variable, invoker.environment) {
_script_args += [ "--env=$variable" ]
}
}
if (defined(invoker.inputs)) {
_inputs = invoker.inputs
} else {
_inputs = []
}
# List the script to run as an input so that the action is re-run when it is
# modified.
if (defined(invoker.script)) {
_inputs += [ invoker.script ]
}
if (defined(invoker.outputs)) {
_outputs = invoker.outputs
} else {
_outputs = []
}
# If a stamp file is requested, add it as an output of the runner script.
if (defined(invoker.stamp) && invoker.stamp != false) {
if (invoker.stamp == true) {
_stamp_file = "$target_gen_dir/$target_name.pw_pystamp"
} else {
_stamp_file = invoker.stamp
}
_outputs += [ _stamp_file ]
_script_args += [
"--touch",
rebase_path(_stamp_file),
]
}
# Capture output or not (defaults to true).
if (!defined(invoker.capture_output) || invoker.capture_output) {
_script_args += [ "--capture-output" ]
}
if (defined(invoker.module)) {
_script_args += [
"--module",
invoker.module,
]
}
# "--" indicates the end of arguments to the runner script.
# Everything beyond this point is interpreted as the command and arguments
# of the Python script to run.
_script_args += [ "--" ]
if (defined(invoker.script)) {
_script_args += [ rebase_path(invoker.script) ]
}
if (defined(invoker.args)) {
_script_args += invoker.args
}
if (defined(invoker._pw_action_type)) {
_action_type = invoker._pw_action_type
} else {
_action_type = "action"
}
target(_action_type, target_name) {
_ignore_vars = [
"script",
"args",
"inputs",
"outputs",
]
forward_variables_from(invoker, "*", _ignore_vars)
script = "$dir_pw_build/py/pw_build/python_runner.py"
args = _script_args
inputs = _inputs
outputs = _outputs
}
}
# Runs pw_python_action once per file over a set of sources.
#
# This template brings pw_python_action's features to action_foreach. Usage is
# the same as pw_python_action, except that sources must be provided and source
# expansion (e.g. "{{source}}") may be used in args and outputs.
#
# See the pw_python_action and action_foreach documentation for full details.
template("pw_python_action_foreach") {
assert(defined(invoker.sources) && invoker.sources != [],
"pw_python_action_foreach requires a list of one or more sources")
pw_python_action(target_name) {
if (defined(invoker.stamp) && invoker.stamp != false) {
if (invoker.stamp == true) {
# Use source file names in the generated stamp file path so they are
# unique for each source.
stamp = "$target_gen_dir/{{source_file_part}}.pw_pystamp"
} else {
stamp = invoker.stamp
}
} else {
stamp = false
}
forward_variables_from(invoker, "*", [ "stamp" ])
_pw_action_type = "action_foreach"
}
}