/usr/share/doc/python-debian/examples/debtags/pkgwalk is in python-debian 0.1.30.
This file is owned by root:root, with mode 0o755.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | #!/usr/bin/python
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
# Navigate among related Debian packages
from __future__ import print_function
import sys
# Requires python-extractor, python-magic and python-debtags
from debian import debtags
import re
from optparse import OptionParser
import apt
VERSION="0.1"
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)
if __name__ == '__main__':
parser = Parser(usage="usage: %prog [options] pkgname",
version="%prog "+ VERSION,
description="walk through Debian packages")
parser.add_option("--tagdb", default="/var/lib/debtags/package-tags", help="Tag database to use (default: %default)")
(options, args) = parser.parse_args()
if len(args) == 0:
parser.error("Please provide the name of an initial package")
# Read full database
db = debtags.DB()
tag_filter = re.compile(r"^special::.+$|^.+::TODO$")
db.read(open(options.tagdb, "r"), lambda x: not tag_filter.match(x))
apt_cache = apt.Cache()
# Maximum number of previous packages to remember
maxlen = 5
# Initial package selection
trail = [ args[0] ]
# Loop until the user chooses to quit
done = False
while not done:
# Compute a package weight according to how old it is in the
# trail
pkgweight = {}
for idx, pkg in enumerate(trail):
pkgweight[pkg] = 1.-(idx/maxlen)
# For every tag, find the number of packages in trail that have the tag
tagscores = {}
for pkg in trail:
for tag in db.tags_of_package(pkg):
if tag in tagscores:
tagscores[tag] += pkgweight[pkg]
else:
tagscores[tag] = pkgweight[pkg]
# Divide every tag score by the number of packages in the trail,
# obtaining a 'tag weight'. A package can be later scored by summing
# the weight of all its tags.
for tag in tagscores:
tagscores[tag] = float(tagscores[tag]) / float(len(trail))
# Find the merged tagset of the packages in trail
trailtags = set(tagscores.keys())
# Get the list of packages whose tagsets intersect the trail tagset
nextpkgs = set()
for pkg, tags in db.iter_packages_tags():
if trailtags & tags:
nextpkgs.add(pkg)
# Score every package by the sum of the weight of its tags
def pkgscore(pkg):
score = 0.0
for tag in db.tags_of_package(pkg):
if tag in tagscores:
score += tagscores[tag]
return score
# Show the first 20 packages in reverse score order
#display = sorted(nextpkgs - set(trail), key=pkgscore, reverse=True)[:20]
display = sorted(nextpkgs, key=pkgscore, reverse=True)[:20]
for num, pkg in enumerate(display):
aptpkg = apt_cache[pkg]
desc = aptpkg.raw_description.split("\n")[0]
print("%2d) %s - %s" % (num + 1, pkg, desc))
# Ask the user to choose a new package
while True:
if sys.version >= '3':
ans = input("> ").strip()
else:
ans = raw_input("> ").strip()
if ans[0] == 'q':
done = True
break
elif ans.isdigit():
num = int(ans) - 1
if num < len(display):
# TODO: on a different kind of interface, display the full
# description of pkg
trail = [display[num]] + trail[:maxlen]
break
else:
print("The number is too high")
# vim:set ts=4 sw=4:
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