Create config reader

escpos/config.py

@@ -0,0 +1,64 @@
+from __future__ import absolute_import
+
+import os
+import appdirs
+from localconfig import config
+
+from . import printer
+from .exceptions import *
+
+class Config(object):
+
+    _app_name = 'python-escpos'
+    _config_file = 'config.ini'
+
+    def __init__(self):
+        self._has_loaded = False
+        self._printer = None
+
+        self._printer_name = None
+        self._printer_config = None
+
+    def load(self, config_path=None):
+        # If they didn't pass one, load default
+        if not config_path:
+            config_path = os.path.join(
+                appdirs.user_config_dir(self._app_name),
+                self._config_file
+            )
+
+        # Deal with one config or a list of them
+        # Configparser does this, but I need it for the list in the error message
+        if isinstance(config_path, basestring):
+            config_path = [config_path]
+
+        files_read = config.read(config_path)
+        if not files_read:
+            raise ConfigNotFoundError('Couldn\'t read config at one or more of {config_path}'.format(
+                config_path="\n".join(config_path),
+            ))
+
+        if 'printer' in config:
+            # For some reason, dict(config.printer) raises
+            # TypeError: attribute of type 'NoneType' is not callable
+            self._printer_config = dict(list(config.printer))
+            self._printer_name = self._printer_config.pop('type').title()
+
+            if not self._printer_name or not hasattr(printer, self._printer_name):
+                raise ConfigSyntaxError('Printer type "{printer_name}" is invalid'.format(
+                    printer_name=self._printer_name,
+                ))
+
+        self._has_loaded = True
+
+    def printer(self):
+        if not self._has_loaded:
+            self.load()
+
+        if not self._printer:
+            # We could catch init errors and make them a ConfigSyntaxError, 
+            # but I'll just let them pass
+            self._printer = getattr(printer, self._printer_name)(**self._printer_config)
+
+        return self._printer
+