Add a -c/--check-config option to check the config file

It displays the missing options and the ones which are changed
from the default values.

3 files changed, 39 insertions, 4 deletions

diff --git a/src/args.py b/src/args.py
index 637d3158..a67a0142 100644
--- a/src/args.py
+++ b/src/args.py
@@ -11,14 +11,17 @@ def parse_args(CONFIG_PATH=''):
     """
     Parse the arguments from the command line
     """
-    parser = ArgumentParser()
+    parser = ArgumentParser('poezio')
+    parser.add_argument("-c", "--check-config", dest="check_config",
+                        action='store_true',
+                        help=_('Check the config file'))
+    parser.add_argument("-d", "--debug", dest="debug",
+                        help=_("The file where debug will be written"),
+                        metavar="DEBUG_FILE")
     parser.add_argument("-f", "--file", dest="filename",
                         default=path.join(CONFIG_PATH, 'poezio.cfg'),
                         help=_("The config file you want to use"),
                         metavar="CONFIG_FILE")
-    parser.add_argument("-d", "--debug", dest="debug",
-                        help=_("The file where debug will be written"),
-                        metavar="DEBUG_FILE")
     parser.add_argument("-v", "--version", dest="version",
                         help=SUPPRESS, metavar="VERSION",
                         default="0.9-dev")
diff --git a/src/config.py b/src/config.py
index ef5168e1..333809d2 100644
--- a/src/config.py
+++ b/src/config.py
@@ -522,6 +522,34 @@ def check_create_cache_dir():
     except OSError:
         pass
 
+def check_config():
+    """
+    Check the config file and print results
+    """
+    result = {'missing': [], 'changed': []}
+    for option in DEFAULT_CONFIG['Poezio']:
+        value = config.get(option)
+        if value != DEFAULT_CONFIG['Poezio'][option]:
+            result['changed'].append((option, value, DEFAULT_CONFIG['Poezio'][option]))
+        else:
+            value = config.get(option, default='')
+            upper = value.upper()
+            default = str(DEFAULT_CONFIG['Poezio'][option]).upper()
+            if upper != default:
+                result['missing'].append(option)
+
+    result['changed'].sort(key=lambda x: x[0])
+    result['missing'].sort()
+    if result['changed']:
+        print('\033[1mOptions changed from the default configuration:\033[0m\n')
+        for option, new_value, default in result['changed']:
+            print('    \033[1m%s\033[0m = \033[33m%s\033[0m (default: \033[32m%s\033[0m)' % (option, new_value, default))
+
+    if result['missing']:
+        print('\n\033[1mMissing options:\033[0m (the defaults are used)\n')
+        for option in result['missing']:
+            print('    \033[31m%s\033[0m' % option)
+
 def run_cmdline_args(CONFIG_PATH):
     "Parse the command line arguments"
     global options
diff --git a/src/poezio.py b/src/poezio.py
index 1a5a257e..7a83f510 100644
--- a/src/poezio.py
+++ b/src/poezio.py
@@ -59,6 +59,10 @@ def main():
 
     from config import options
 
+    if options.check_config:
+        config.check_config()
+        sys.exit(0)
+
     import theming
     theming.update_themes_dir()