ninja: Generate everything to 'ee.ninja', generate 'build.ninja' only if

it is missing. A stub build.ninja which includes ee.ninja will be
generated once. This makes it easier for the user to do custom stuff in
the standard Ninja file.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/ee/tools/ninja.py b/src/ee/tools/ninja.py
index 2c8a88a..ffc80c9 100644
--- a/src/ee/tools/ninja.py
+++ b/src/ee/tools/ninja.py
@@ -86,6 +86,7 @@ def generate(project: Project):
 
     # ee_dir = sch_path.parent / "ee"
     build_ninja = project.project_dir / "build.ninja"
+    ee_ninja = project.project_dir / "ee.ninja"
 
     parts_yaml_files = [path for path in project.project_dir.iterdir() if str(path).endswith("-parts.yaml")]
     params["parts_yaml_files"] = parts_yaml_files
@@ -94,7 +95,15 @@ def generate(project: Project):
     part_dbs.extend([parent_dir_filter(p) / noext_filter(p) for p in parts_yaml_files])
     part_dbs.extend([Path("ee") / d / "parts" for d in distributors])
 
-    with build_ninja.open("w") as f:
+    if not build_ninja.exists():
+        with build_ninja.open("w") as f:
+            f.writelines(["# This file was generated by eetools. Add your own rules and build commands\n",
+                          "# here, but keep the include line as we'll update ee.ninja for you when your\n",
+                          "# configuration changes\n",
+                          "\n",
+                          "include ee.ninja\n"])
+
+    with ee_ninja.open("w") as f:
         env = _create_env()
         template = env.get_template("build.ninja.j2")
         f.write(template.render(**params))