refactor prompt completion

This just splits the file completion.py into several files, one for each
Completer subclass.

1 files changed, 54 insertions, 0 deletions

diff --git a/alot/completion/commandline.py b/alot/completion/commandline.py
new file mode 100644
index 00000000..f5739f38
--- /dev/null
+++ b/alot/completion/commandline.py
@@ -0,0 +1,54 @@
+# Copyright (C) 2011-2019  Patrick Totzke <patricktotzke@gmail.com>
+# This file is released under the GNU GPL, version 3 or a later revision.
+# For further details see the COPYING file
+
+from .completer import Completer
+from .command import CommandCompleter
+from ..helper import split_commandline
+
+
+class CommandLineCompleter(Completer):
+    """completes command lines: semicolon separated command strings"""
+
+    def __init__(self, dbman, mode, currentbuffer=None):
+        """
+        :param dbman: used to look up available tagstrings
+        :type dbman: :class:`~alot.db.DBManager`
+        :param mode: mode identifier
+        :type mode: str
+        :param currentbuffer: currently active buffer. If defined, this will be
+                              used to dynamically extract possible completion
+                              strings
+        :type currentbuffer: :class:`~alot.buffers.Buffer`
+        """
+        self._commandcompleter = CommandCompleter(dbman, mode, currentbuffer)
+
+    @staticmethod
+    def get_context(line, pos):
+        """
+        computes start and end position of substring of line that is the
+        command string under given position
+        """
+        commands = split_commandline(line) + ['']
+        i = 0
+        start = 0
+        end = len(commands[i])
+        while pos > end:
+            i += 1
+            start = end + 1
+            end += 1 + len(commands[i])
+        return start, end
+
+    def complete(self, line, pos):
+        cstart, cend = self.get_context(line, pos)
+        before = line[:cstart]
+        after = line[cend:]
+        cmdstring = line[cstart:cend]
+        cpos = pos - cstart
+
+        res = []
+        for ccmd, ccpos in self._commandcompleter.complete(cmdstring, cpos):
+            newtext = before + ccmd + after
+            newpos = pos + (ccpos - cpos)
+            res.append((newtext, newpos))
+        return res