Generate patch automerge package rules in post-gen-project hook

hooks/post_gen_project.py

@@ -1,3 +1,4 @@
+import json
 import os
 import shutil
 
@@ -7,6 +8,8 @@
 
 create_lib = "{{ cookiecutter.add_lib }}" == "y"
 add_golden = "{{ cookiecutter.add_golden }}" == "y"
+automerge_patch = "{{ cookiecutter.automerge_patch }}" == "y"
+automerge_patch_v0 = "{{ cookiecutter.automerge_patch_v0 }}" == "y"
 
 if not create_lib:
     shutil.rmtree("lib")
@@ -35,5 +38,38 @@
 if not add_golden:
     shutil.rmtree("tests/golden")
 
+with open("renovate.json", "r", encoding="utf-8") as f:
+    renovatejson = json.load(f)
+
+# We always add an empty package rules list
+renovatejson["packageRules"] = []
+
+if automerge_patch:
+    # automerge patch PRs
+    patch_rule = {
+        "matchUpdateTypes": ["patch"],
+        # negative match: do not match versions that match regex `^v?0\.`
+        "matchCurrentVersion": "!/^v?0\\./",
+        "automerge": True,
+        # NOTE: We can't use Platform Automerge because the repositories are configured manually,
+        # so we can't be sure the "require status checks" option is always enabled, and without
+        # that, platformAutomerge does not wait for tests to pass.
+        "platformAutomerge": False,
+        # NOTE: We need to add all the labels we want here, renovate doesn't inherit globally
+        # specified labels for package rules
+        "labels": ["dependency", "automerge"],
+    }
+    if automerge_patch_v0:
+        # remove match current version if we want v0.x patch automerge
+        del patch_rule["matchCurrentVersion"]
+
+    renovatejson["packageRules"].append(patch_rule)
+
+# NOTE: Later rules in `packageRules` take precedence
+
+with open("renovate.json", "w", encoding="utf-8") as f:
+    json.dump(renovatejson, f, indent=2)
+    f.write("\n")
+
 if Path(".sync.yml").is_file():
     os.unlink(Path(".sync.yml"))

{{ cookiecutter.slug }}/renovate.json

@@ -24,23 +24,5 @@
   "labels": [
     "dependency"
   ],
-  "separateMinorPatch": true,
-  "packageRules": [
-    {%- if cookiecutter.automerge_patch == "y" %}
-    {
-      "matchUpdateTypes": ["patch"],
-      {%- if cookiecutter.automerge_patch_v0 != "y" %}
-      "matchCurrentVersion": "!/^v?0\\./",{# negative match: do not match versions that match regex `^v?0\.` #}
-      {%- endif %}
-      "automerge": true,
-      {#- We can't use Platform Automerge because the repositories are configured manually, so we can't be sure the "require status checks" option is always enabled, and without that, platformAutomerge does not wait for tests to pass. #}
-      "platformAutomerge": false,
-      "labels": [
-        "dependency",
-        "automerge"
-      ]
-    }
-    {%- endif %}
-    {#- re: SYN-785 - Later rules take precedence, so add more specific package rules below. #}
-  ]
+  "separateMinorPatch": true
 }