Improve PR labelling

src/tools/fetch_labels.sh

@@ -5,16 +5,31 @@
 # [0]: Taken by Bash, the name of the script
 # [1]: The repositories filename to obtain the configuration from. E.g.: `repos.lua`
 # [2]: The mode that will be used. Available modes are: "fetch" and "update"
+# [3]: The repository name. E.g.: "panqkart/panqkart"
 
 labels=""
 
+# Taken and slightly edited from https://github.com/dependabot/dependabot-core/blob/main/common/lib/dependabot/pull_request_creator/labeler.rb#L9
+dependencies_label_regex='^[^/]*[Dd][Ee][Pp]endenc[^/]+$'
+
 if [ "$2" == "fetch" ]; then
     labels=$(lua -e 'local labels = require("$1").config; if labels.labels_fetch then print(labels.labels_fetch) end') || "repo-fetch,dependencies"
 elif [ "$2" == "update" ]; then
     labels=$(lua -e 'local labels = require("$1").config; if labels.labels_update then print(labels.labels_update) end') || "dependencies"
 else
-    # Invalid mode. Basic labels will be used instead.
-    labels="dependencies"
+    # Invalid mode. Use the regex to search for the closest match.
+    repo_labels=$(gh api repos/$3/labels | jq -r '.[].name')
+
+    for label in $repo_labels; do
+        if [[ $label =~ $dependenies_label_regex ]]; then
+            labels=$label
+            break
+        else
+            # No match found. Create a `dependencies` label by running the `create_label` command in GH CLI.
+            gh api repos/$3/labels -f name=dependencies -f color=0366d6 -f description="Pull requests that update a dependency file"
+            labels="dependencies"
+        fi
+    done
 fi
 
 echo $labels