Rework code to build the compdb for clang-tidy.

mythtv/Makefile

@@ -121,9 +121,4 @@ cleanall: clean
 
 compdb:
 	@echo "Building ../compile_commands.json"
-	@JFILES="$(shell find .. -name *.o.json \
-			 | grep -v /external/ \
-			 | grep -v /moc_ \
-			 | grep -v dummy.o.json)"; \
-	 sed -e '1s/^/[\n/' -e '$$s/,$$/\n]/' $$JFILES > ../compile_commands.json
-	@echo "If the output looks wrong, did you remember to clear ccache?"
+	@programs/scripts/build_compdb.py

mythtv/programs/scripts/build_compdb.py

@@ -0,0 +1,56 @@
+#! /usr/bin/python3
+
+from pathlib import Path
+import json
+from optparse import OptionParser
+
+parser = OptionParser()
+parser.add_option("-v", "--verbose",
+                  action="store_true", dest="verbose",
+                  help="Print progress messages")
+(options, args) = parser.parse_args()
+
+paths = list(Path("..").glob("**/*.o.json"))
+if len(paths) < 600:
+    print("Not enough *.o.json files present.  Did you remember to")
+    print("clean ccache and do a full build with clang?")
+    exit(1)
+
+outlines = []
+for path in paths:
+    filename = path.as_posix()
+    badnames = ["/external/", "moc_", "dummy.o.json"]
+    if any(bad in filename for bad in badnames):
+        if options.verbose:
+            print("Skipping input file: {0:s}".format(path.as_posix()))
+        continue
+    in_file = open(path, "r")
+    if not in_file:
+        if options.verbose:
+            print("Cannot open input file: {0:s}".format(filename))
+        continue
+
+    # Read and strip trailing comma
+    rawcontent = in_file.read()
+    if len(rawcontent) < 2:
+        print("Bad file contents: {0:s}".format(filename))
+        exit(1)
+    content = json.loads(rawcontent[:-2])
+    in_file.close()
+
+    # Manipulate file names
+    if content["file"].startswith("../") and not content["file"].endswith("Json.cpp"):
+        if options.verbose:
+            print("Skipping input file2: {0:s}".format(filename))
+        continue
+    content["file"] = content["directory"] + "/" + content["file"]
+
+    # Save the output for this file
+    if options.verbose:
+        print("Including input file: {0:s}".format(path.as_posix()))
+    outlines.append(json.dumps(content, indent=4))
+
+# Dump out the compdb file
+out_file = open("../compile_commands.json", "w")
+print("[\n{0:s}\n]".format(",\n".join(outlines)), file=out_file)
+out_file.close()