core (log): configuration and environment variables are now checked for log level and colors:

- variable change logs behaviour, so far only level and colors are implemented
    - configuration use log_[name], for example you can put log_level=debug in sat.conf (section [DEFAULT]) to see all levels
    - environment variables use SAT_LOG_[NAME]: e.g. SAT_LOG_LEVEL=debug
    - colors can be true, false or force to force colors even if stdout is not a tty

src/core/constants.py

@@ -34,6 +34,7 @@ class Const(object):
     APP_VERSION = u'0.4.1D'  # Please add 'D' at the end for dev versions
     APP_URL = 'http://salut-a-toi.org'
 
+
     ## Parameters ##
     NO_SECURITY_LIMIT = -1
     INDIVIDUAL = "individual"
@@ -47,6 +48,8 @@ class Const(object):
     ENTITY_LAST_RESOURCE = 'LAST_RESOURCE'
     ENTITY_CAP_HASH = 'CAP_HASH'
 
+
+    ## Configuration ##
     if BaseDirectory:  # skipped when imported from Libervia browser_side
 
         ## Configuration ##
@@ -66,21 +69,30 @@ class Const(object):
         CONFIG_FILES = [(os.path.expanduser(path) + 'sat.conf') for path in \
                         ['/etc/', '~/', '~/.', '', '.'] + \
                         ['%s/' % path for path in list(BaseDirectory.load_config_paths('sat'))]
-                        ]
+                       ]
+
 
     ## Plugins ##
     # names of widely used plugins
     TEXT_CMDS = 'TEXT-COMMANDS'
 
+
     ## Logging ##
     LOG_BACKEND_STANDARD = 'standard'
     LOG_BACKEND_TWISTED = 'twisted'
     LOG_BACKEND_BASIC = 'basic'
     LOG_BASE_LOGGER = 'root'
+    LOG_OPT_PREFIX = 'log_'
+    # (option_name, default_value) tuples
+    LOG_OPT_COLORS = ('colors', 'true')
+    LOG_OPT_LEVEL = ('level', 'info')
+
 
     ## Misc ##
     SAVEFILE_DATABASE = "sat.db"
     IQ_SET = '/iq[@type="set"]'
+    ENV_PREFIX = 'SAT_' # Prefix used for environment variables
+
 
     ## ANSI escape sequences ##
     # XXX: used for logging