pw_exec GN template
This change adds a GN template which executes a non-Python program to
avoid having to write custom Python wrappers every time.
Change-Id: I36aa607dc99072d26ea7242f6ce110f2b43f71db
diff --git a/pw_build/exec.gni b/pw_build/exec.gni
new file mode 100644
index 0000000..88b2b41
--- /dev/null
+++ b/pw_build/exec.gni
@@ -0,0 +1,49 @@
+# Copyright 2019 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("python_script.gni")
+
+# Runs a program which isn't in Python.
+#
+# This is provided to avoid having to write a new Python wrapper script every
+# time a program needs to be run from GN.
+#
+# Args:
+# program: The program to run. Can be a full path or just a name (in which case
+# $PATH is searched).
+# args: Optional list of arguments to the program.
+# inputs: Optional list of build inputs to the program.
+# outputs: Optional list of artifacts produced by the program's execution.
+template("pw_exec") {
+ assert(defined(invoker.program), "pw_exec requires a program to run")
+
+ pw_python_script(target_name) {
+ script = "$dir_pw_build/py/exec.py"
+ args = [ invoker.program ]
+
+ if (defined(invoker.args)) {
+ args += invoker.args
+ }
+
+ if (defined(invoker.inputs)) {
+ inputs = invoker.inputs
+ }
+
+ if (defined(invoker.outputs)) {
+ outputs = invoker.outputs
+ } else {
+ stamp = true
+ }
+ }
+}