add CI check for DMI conflict markers (#22494)

* add CI check for DMI conflict markers

* helps to do the thing

.github/workflows/ci.yml

@@ -36,6 +36,7 @@ jobs:
           python tools/ci/check_file_names.py
           python tools/ci/unticked_files.py ${GITHUB_WORKSPACE}
           python tools/ci/illegal_dme_files.py ${GITHUB_WORKSPACE}
+          python -m tools.ci.check_icon_conflicts
           python -m tools.maplint.source --github
           ~/dreamchecker > ${GITHUB_WORKSPACE}/output-annotations.txt 2>&1
       - name: Annotate Lints

tools/ci/check_icon_conflicts.py

@@ -0,0 +1,37 @@
+from collections import defaultdict
+import glob
+import sys
+import time
+
+from ..dmi import Dmi
+
+
+if __name__ == "__main__":
+    print("check_icon_conflicts started")
+
+    count = 0
+    exit_code = 0
+    start = time.time()
+
+    findings = defaultdict(list)
+
+    for dmi_path in glob.glob("**/*.dmi", recursive=True):
+        dmi = Dmi.from_file(dmi_path)
+        for state in dmi.states:
+            if '!CONFLICT!' in state.name:
+                findings[dmi_path].append(state.name)
+        count += 1
+
+    if findings:
+        exit_code = 1
+
+        for filename in sorted(findings.keys()):
+            states = findings[filename]
+            for state in sorted(states):
+                print(f"{filename}: conflicted state {state}")
+
+
+    end = time.time()
+    print(f"\ncheck_icon_conflicts checked {count} files in {end - start:.2f}s\n")
+
+    sys.exit(exit_code)