# HG changeset patch
# User Ludovic Chabant <ludovic@chabant.com>
# Date 1439755339 25200
# Node ID 353a0b30f412f1ca4ebc5a433f59c893b62a1d83
# Parent  e7fb848fd55d94398b3c8056778060ac9ecea931
chef: Add `--debug-only` option to only show debug logging for a given logger.

diff -r e7fb848fd55d -r 353a0b30f412 piecrust/main.py
--- a/piecrust/main.py	Fri Aug 14 22:57:59 2015 -0700
+++ b/piecrust/main.py	Sun Aug 16 13:02:19 2015 -0700
@@ -85,6 +85,7 @@
         self.log_debug = log_debug
         self.config_variant = config_variant
         self.config_values = []
+        self.debug_only = []
 
 
 def _parse_config_value(arg):
@@ -125,6 +126,9 @@
             i += 1
         elif arg == '--log-debug':
             res.log_debug = True
+        elif arg == '--debug-only':
+            res.debug_only.append(argv[i + 1])
+            i += 1
         elif arg == '--no-cache':
             res.cache = False
         elif arg == '--debug':
@@ -146,8 +150,11 @@
     if res.debug or res.log_debug:
         root_logger.setLevel(logging.DEBUG)
 
+    for n in res.debug_only:
+        logging.getLogger(n).setLevel(logging.DEBUG)
+
     log_handler = logging.StreamHandler(sys.stdout)
-    if res.debug:
+    if res.debug or res.debug_only:
         log_handler.setLevel(logging.DEBUG)
         log_handler.setFormatter(ColoredFormatter("[%(name)s] %(message)s"))
     else:
@@ -219,6 +226,9 @@
             '--debug',
             help="Show debug information.", action='store_true')
     parser.add_argument(
+            '--debug-only',
+            help="Only show debug information for the given categories.")
+    parser.add_argument(
             '--no-cache',
             help="When applicable, disable caching.",
             action='store_true')