Persistent history and tab completion (from the history) support.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@669 6335cc39-0255-0410-8fd6-9bcaacd3b74c
2002-03-17 21:25:20 +00:00
parent ca29aee202
commit be6c4511ee
4 changed files with 212 additions and 19 deletions
@@ -0,0 +1,90 @@
+#
+# $Id: history.py,v 1.1 2002/03/17 21:25:20 mdb Exp $
+# 
+# lookuplet - a utility for quickly looking up information
+# Copyright (C) 2001 Michael Bayne
+# 
+# This program 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 2.1 of the License, or (at your
+# option) any later version.
+# 
+# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+import gnome.config
+
+class History:
+    "Used to persistently maintain a history of entries for the \
+    lookuplet query text field."
+
+    # the maximum history size
+    HISTORY_SIZE = 10;
+
+    # the actual history entries
+    history = [];
+
+    #
+    # Loads up the history from persistent preferences and prepares for
+    # operation.
+    #
+    def __init__ (self):
+        gnome.config.push_prefix("/lookuplet/");
+        count = gnome.config.get_int("lookuplet/history/count");
+        for h in range(0, count):
+            self.history.append(gnome.config.get_string(
+                "lookuplet/history/entry_%.2u" % h));
+            # print "loaded %d: %s" % (h, self.history[h]);
+        gnome.config.pop_prefix();
+        return;
+
+    #
+    # Adds an entry to the history.
+    #
+    def append (self, entry):
+        # if this entry is already in the history list, we simply want to
+        # move it to the end
+        if (entry in self.history):
+            self.history.remove(entry);
+
+        # add our entry
+        self.history.append(entry);
+
+        # trim the history if it's too big
+        if (len(self.history) > self.HISTORY_SIZE):
+            self.history.pop(0);
+
+        # flush our config to the configuration repository
+        gnome.config.push_prefix("/lookuplet/");
+        count = len(self.history);
+        gnome.config.set_int("lookuplet/history/count", count);
+        for h in range(0, count):
+            gnome.config.set_string(
+                "lookuplet/history/entry_%.2u" % h, self.history[h]);
+            # print "wrote %d: %s" % (h, self.history[h]);
+        gnome.config.sync();
+        gnome.config.drop_all();
+        gnome.config.pop_prefix();
+
+    #
+    # Scans back from one before the specified index looking for a history
+    # entry that matches the specified prefix, returning its index if one
+    # is found or -1 if one is not.
+    #
+    def match (self, prefix, index):
+        count = len(self.history);
+        for offset in range(1, count+1):
+            # do some funny math to always ensure a positive value
+            pos = (index - offset + count) % count;
+            # print "scanning %s for %s." % (self.history[pos], prefix);
+            if (self.history[pos].find(prefix) == 0):
+                # print "found it at %d." % pos;
+                return pos;
+        # print "didn't find it.";
+        return -1;