mkexp: added 'key' option to getexp for querying a specific config value

CHANGES.txt

@@ -16,6 +16,7 @@ Global
 * Changed mkexp namelist formatting to add multi-group identifiers as comment
 * Changed merge of process environment ('DEFAULT' section) to be sorted
 * Added tool 'duexp' to show disk usage by the given experiment
+* Added 'key' option to getexp for querying a specific config value
 
 Release 1.0.0
 =============

getexp

@@ -12,6 +12,31 @@ import sys
 from expconfig import ExpConfig, ExpConfigError
 from feedback import setLevel, INFO, die, info
 
+#
+# Utilities
+#
+
+# Get config value, parsing dotted keys
+
+def get_value(config, key):
+    sections = []
+    pos = key.rfind('.')
+    while(pos >= 0):
+        if key[pos-1] == '.':
+            key = key[0:pos-1]+key[pos:]
+            pos = key.rfind('.', 0, pos-1)
+        else:
+            sections.append(key[pos+1:])
+            key = key[0:pos]
+            pos = key.rfind('.')
+    if key:
+        sections.append(key)
+    sections.reverse()
+    key = sections.pop()
+    for section in sections:
+        config = config[section]
+    return config[key]
+
 #
 # Main routine
 #
@@ -38,6 +63,8 @@ command_line.add_argument('--readme', '-R', action='store_true',
 command_line.add_argument('--verbose', '-v', action='count',
                           help='show all top-level settings, '
                                'or all settings if used twice')
+command_line.add_argument('--key', '-k',
+                          help='print value of given configuration key')
 
 args = command_line.parse_args()
 
@@ -73,6 +100,8 @@ except ExpConfigError as error:
 
 if args.readme:
     print(config['EXP_DESCRIPTION'])
+elif args.key:
+    print(get_value(config, args.key));
 elif args.verbose >= 2:
     config.indent_type = '  '
     config.write(sys.stdout)
@@ -82,7 +111,6 @@ elif args.verbose == 1:
     for (key, value) in items:
         if not isinstance(value, dict):
             print("{0}='{1}'".format(key, str(value).replace("'",'"')))
-
 else:
     print("EXP_ID='{0}'".format(config.experiment_id))
     print("MODEL_DIR='{0}'".format(config['MODEL_DIR']))