util/lint: Generate json output from checkpatch output

checkpatch_json.py processes the output of checkpatch.pl &
generates json format output of comments.

This json format output can be used to post comment on particular
CL using gerrit.

BUG=None
BRANCH=None
TEST= Run following commands:
1. Capture output of checkpatch.pl to file say checkpatch.txt
nice -n 20 git diff HEAD~ | util/lint/checkpatch.pl --no-signoff -q - |
tee checkpatch.txt
2. Generate json format file for the output.
util/lint/checkpatch_json.py checkpatch.txt comment.json
3. Post the comment.json using gerrit
ssh  coreboot.org gerrit review  -j  "<CL number>,<patchset number>"  < comment.json

Change-Id: I2471792796ab8e7d9855a6559fc731345ebd1525
Signed-off-by: Naresh G Solanki <naresh.solanki@intel.com>
Signed-off-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Reviewed-on: https://review.coreboot.org/23429
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/lint/checkpatch_json.py

@@ -0,0 +1,69 @@
+#!/usr/bin/python
+# Copyright (C) 2018 Intel Corporation.
+# written by Naresh G Solanki<naresh.solanki@intel.com> and
+#            Maulik V Vaghela <maulik.v.vaghela@intel.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+"""
+This utilty generate json output to post comment in gerrit.
+
+INPUT: output of checkpatch.pl.
+OUTPUT: json format output that can be used to post comment in gerrit
+"""
+import os
+import sys
+import json
+
+data = {}
+data['comments'] = []
+list_temp = {}
+
+def update_struct( file_path, msg_output, line_number):
+    if file_path not in list_temp:
+        list_temp[file_path] = []
+    list_temp[file_path].append({
+        "line" : line_number,
+        "message" : msg_output,}
+    )
+
+def parse_file(input_file):
+    fp = open (input_file, "r")
+    for line in fp:
+        if "ERROR" in line:
+            msg_output = line.split("ERROR:")[1].strip()
+        elif "WARNING" in line:
+            msg_output = line.split("WARNING:")[1].strip()
+        elif "FILE" in line:
+            temp = line.split("FILE:")
+            file_path = temp[1].split(":")[0]
+            line_number = temp[1].split(":")[1]
+            update_struct( file_path.strip(), msg_output, str(line_number)  )
+        else:
+            continue
+    fp.close()
+
+def main():
+    if (len(sys.argv) < 3) or (sys.argv[1] == "-h"):
+        print "HELP:"
+        print  sys.argv[0] + " <input file> <output file in json>"
+        sys.exit()
+
+    print sys.argv[1]
+    parse_file(sys.argv[1])
+    data['comments'] = list_temp
+    print json.dumps(data)
+    out_file = open( sys.argv[2] , "w")
+    json.dump(data, out_file, sort_keys=True, indent=4)
+    out_file.close()
+
+if __name__ == "__main__":
+    main()