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#!/usr/bin/python
# axi-searchasyoutype - Search-as-you-type demo
#
# Copyright (C) 2007 Enrico Zini <enrico@debian.org>
#
# 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 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
from optparse import OptionParser
import sys
VERSION="0.1"
# Let's start with a simple command line parser with help
class Parser(OptionParser):
def __init__(self, *args, **kwargs):
OptionParser.__init__(self, *args, **kwargs)
def error(self, msg):
sys.stderr.write("%s: error: %s\n\n" % (self.get_prog_name(), msg))
self.print_help(sys.stderr)
sys.exit(2)
parser = Parser(usage="usage: %prog [options] keywords",
version="%prog "+ VERSION,
description="Query the Apt Xapian index. Command line arguments can be keywords or Debtags tags")
parser.add_option("-t", "--type", help="package type, one of 'game', 'gui', 'cmdline' or 'editor'")
(options, args) = parser.parse_args()
# Import the rest here so we don't need dependencies to be installed only to
# print commandline help
import os
import xapian
from aptxapianindex import *
# Instantiate a xapian.Database object for read only access to the index
db = xapian.Database(XAPIANDB)
# Instantiate the APT cache as well
cache = apt.Cache()
import curses
import curses.wrapper
import re
class Results:
"""
Show the results of a query while we type it
"""
def __init__(self, stdscr):
maxy, maxx = stdscr.getmaxyx()
self.size = maxy-1
self.splitline = re.compile(r'\s+')
self.win = curses.newwin(self.size, maxx, 0, 0)
self.win.clear()
def noresults(self, suggestion = "type more"):
self.win.clear()
self.win.addstr(0, 0, "No results, " + suggestion, curses.A_BOLD)
self.win.refresh()
def update(self, line):
"""
Show the results of the search done using the given line of text
"""
line = line.lower().strip()
if len(line) == 0:
# No text given: abort
self.noresults()
return
# Split the line in words
args = self.splitline.split(line)
if len(args) == 0:
# No text given: abort
self.noresults()
return
# To understand the following code, keep in mind that we do
# search-as-you-type, so the last word may be partially typed.
if len(args[-1]) == 1:
# If the last term has only one character, we ignore it waiting for
# the user to type more. A better implementation can set up a
# timer to disable this some time after the user stopped typing, to
# give meaningful results to searches like "programming in c"
args = args[:-1]
if len(args) == 0:
self.noresults()
return
# Convert the words into terms for the query
terms = termsForSimpleQuery(args)
# Since the last word can be partially typed, we add all words that
# begin with the last one.
terms.extend([x.term for x in db.allterms(args[-1])])
# Build the query
query = xapian.Query(xapian.Query.OP_OR, terms)
# Add the simple user filter, if requested. This is to show that even
# when we do search-as-you-type, everything works as usual
query = addSimpleFilterToQuery(query, options.type)
# Perform the query
enquire = xapian.Enquire(db)
enquire.set_query(query)
# This does the adaptive cutoff trick on the query results (see
# axi-query-adaptivecutoff.py)
mset = enquire.get_mset(0, 1)
try:
topWeight = mset[0].weight
except IndexError:
self.noresults("change your query")
return
enquire.set_cutoff(0, topWeight * 0.7)
# Retrieve as many results as we can show
mset = enquire.get_mset(0, self.size - 1)
# Redraw the window
self.win.clear()
# Header
self.win.addstr(0, 0, "%i results found." % mset.get_matches_estimated(), curses.A_BOLD)
# Results
for y, m in enumerate(mset):
# /var/lib/apt-xapian-index/README tells us that the Xapian document data
# is the package name.
name = m.document.get_data()
# Get the package record out of the Apt cache, so we can retrieve the short
# description
pkg = cache[name]
if pkg.candidate:
# Print the match, together with the short description
self.win.addstr(y+1, 0, "%i%% %s - %s" % (m.percent, name, pkg.candidate.summary))
self.win.refresh()
# Build the base query as seen in axi-query-simple.py
class Input:
def __init__(self, stdscr, results):
maxy, maxx = stdscr.getmaxyx()
self.results = results
self.win = curses.newwin(1, maxx, maxy-1, 0)
self.win.bkgdset(' ', curses.A_REVERSE)
self.win.clear()
self.win.addstr(0, 0, "> ", curses.A_REVERSE)
self.line = ""
def mainloop(self):
old = ""
while True:
c = self.win.getch()
if c == 10 or c == 27:
break
elif c == 127:
control = True
if len(self.line) > 0:
self.line = self.line[:-1]
else:
self.line += chr(c)
self.win.clear()
self.win.addstr(0, 0, "> " + self.line, curses.A_REVERSE)
self.win.refresh()
if self.line != old:
self.results.update(self.line)
old = self.line
def main(stdscr):
results = Results(stdscr)
input = Input(stdscr, results)
stdscr.refresh()
input.mainloop()
curses.wrapper(main)
sys.exit(0)
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