Allow disabling patch automerge for selected dependencies

We introduce a new cookiecutter argument which allows users to specify
zero or more regex patterns for dependencies whose patch level updates
shouldn't be automerged.

The template expects that the contents of the new argument is a string
which contains zero or more regex patterns separated by semicolons. The
template will use these patterns as the values for the package rule
field `excludePackagePatterns`.

Author: simu

cookiecutter.json

@@ -14,6 +14,8 @@
   "automerge_patch": "y",
   "automerge_patch_v0": "n",
 
+  "automerge_patch_regexp_blocklist": "",
+
   "copyright_holder": "VSHN AG <info@vshn.ch>",
   "copyright_year": "1950",
 

hooks/post_gen_project.py

@@ -12,6 +12,8 @@
 automerge_patch = "{{ cookiecutter.automerge_patch }}" == "y"
 automerge_patch_v0 = "{{ cookiecutter.automerge_patch_v0 }}" == "y"
 
+automerge_patch_regexp_blocklist = "{{ cookiecutter.automerge_patch_regexp_blocklist }}"
+
 if not create_lib:
     shutil.rmtree("lib")
 
@@ -88,6 +90,13 @@
         # remove match current version if we want v0.x patch automerge
         del patch_rule["matchCurrentVersion"]
 
+    # Set excludePackagePatterns to the provided list of package patterns for which patch PRs
+    # shouldn't be automerged. Only set the field if the provided list isn't empty.
+    if len(automerge_patch_regexp_blocklist) > 0:
+        # NOTE: We expect that the provided pattern list is a string with patterns separated by ;
+        patterns = automerge_patch_regexp_blocklist.split(";")
+        patch_rule["excludePackagePatterns"] = patterns
+
     renovatejson["packageRules"].append(patch_rule)
 
 # NOTE: Later rules in `packageRules` take precedence