Add missing keyconfparser file.

qutebrowser/config/keyconfparser.py

@@ -0,0 +1,108 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2014 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Parser for the key configuration."""
+
+
+import os.path
+
+from qutebrowser.config import configdata
+from qutebrowser.commands import cmdutils
+from qutebrowser.utils import log
+
+
+class KeyConfigError(Exception):
+
+    """Raised on errors with the key config."""
+
+
+class KeyConfigParser:
+
+    """Parser for the keybind config."""
+
+    def __init__(self, configdir, fname):
+        """Constructor.
+
+        Args:
+            configdir: The directory to save the configs in.
+            fname: The filename of the config.
+        """
+        self._configdir = configdir
+        self._configfile = os.path.join(self._configdir, fname)
+        self._cur_section = None
+        self._cur_command = None
+        # Mapping of section name(s) to keybinding -> command dicts.
+        self.keybindings = {}
+        if not os.path.exists(self._configfile):
+            log.init.debug("Creating initial keybinding config.")
+            with open(self._configfile, 'w', encoding='utf-8') as f:
+                f.write(configdata.KEYBINDINGS)
+        self._read()
+
+    def _read(self):
+        """Read the config file from disk and parse it."""
+        with open(self._configfile, 'r', encoding='utf-8') as f:
+            for i, line in enumerate(f):
+                line = line.rstrip()
+                try:
+                    if not line.strip() or line.startswith('#'):
+                        continue
+                    elif line.startswith('[') and line.endswith(']'):
+                        self._cur_section = line[1:-1]
+                    elif line.startswith((' ', '\t')):
+                        line = line.strip()
+                        self._read_keybinding(line)
+                    else:
+                        line = line.strip()
+                        self._read_command(line)
+                except KeyConfigError as e:
+                    e.lineno = i
+                    raise
+
+    def _read_command(self, line):
+        """Read a command from a line."""
+        if self._cur_section is None:
+            raise KeyConfigError("Got command '{}' without getting a "
+                                 "section!".format(line))
+        else:
+            command = line.split(maxsplit=1)[0]
+            if command not in cmdutils.cmd_dict:
+                raise KeyConfigError("Invalid command '{}'!".format(command))
+            self._cur_command = line
+
+    def _read_keybinding(self, line):
+        """Read a keybinding from a line."""
+        if self._cur_command is None:
+            raise KeyConfigError("Got keybinding '{}' without getting a "
+                                 "command!".format(line))
+        else:
+            assert self._cur_section is not None
+            if self._cur_section not in self.keybindings:
+                self.keybindings[self._cur_section] = {}
+            section_bindings = self.keybindings[self._cur_section]
+            section_bindings[line] = self._cur_command
+
+    def get_bindings_for(self, section):
+        """Get a dict with all merged keybindings for a section."""
+        bindings = {}
+        for sectstring, d in self.keybindings.items():
+            sects = [s.strip() for s in sectstring.split(',')]
+            if any(s == section for s in sects):
+                bindings.update(d)
+        return bindings