cli: add logging and --trace option

Author: Sarcasm

compdb/cli.py

@@ -2,6 +2,7 @@
 
 import argparse
 import io
+import logging
 import os
 import sys
 import textwrap
@@ -475,6 +476,12 @@ def main(argv=None):
         description='{}.'.format(__desc__),
         formatter_class=SubcommandHelpFormatter)
 
+    parser.add_argument(
+        '--trace',
+        help="Trace execution",
+        action="store_const",
+        dest="loglevel",
+        const=logging.INFO)
     parser.add_argument(
         '-c',
         dest='config_overrides',
@@ -539,6 +546,7 @@ def main(argv=None):
     # useful to show to the user instead of an error because of missing
     # subcommand
     args = parser.parse_args(argv or sys.argv[1:] or ["help"])
+    logging.basicConfig(level=args.loglevel or logging.WARNING)
     config = compdb.config.LazyTypedConfig(config_schema)
 
     if args.config_overrides:

contrib/zsh/functions/_compdb

@@ -132,6 +132,7 @@ _compdb() {
     # TODO: smart completion of -c argument: section.option=value
     '*-c[set value of configuration variable NAME for this invocation]:key:'
     '*-p[build path]:build directory:_files -/'
+    '--trace[trace execution]'
   )
 
   local curcontext="$curcontext" state line