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/usr/sbin/lubuntu-software-center-build-db is in lubuntu-software-center 0.0.8-0ubuntu1.

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#! /usr/bin/python
# -*- coding:UTF-8 -*-
#       Copyright (c) Stephen Smally <stephen.smally@gmail.com>
#
#       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., 51 Franklin Street, Fifth Floor, Boston,
#       MA 02110-1301, USA.
#

usage = '''
Build a sqlite3-based database from the given directory of desktop files
Usage: lubuntu-software-center-build-db [DB_PATH] [DIRECTORY] [CATEGORYFILE]'''

import sqlite3
import sys
import os
from xdg import DesktopEntry as DE
import xdg
import apt_pkg
from ConfigParser import RawConfigParser
import platform

arch_dict = {
    "x86_64": "amd64",
    "i686": "i386",
    "ppc": "powerpc",
    "ppc64": "powerpc",
    "armv7l": "armhf"
}

arch = arch_dict[platform.machine()]

if len(sys.argv) < 4:
    print(usage)
    sys.exit()

database = sys.argv[1]
base_folder = sys.argv[2]
tags_file = open(sys.argv[3], "r")

if os.path.exists(database):
    os.remove(database)


print("Creating package database in %s" % database)

db = sqlite3.Connection(database)
cursor = db.cursor()

aiddir = os.listdir(base_folder)


def tag_in_cat(tag):
    for (index, tags) in app_tags:
        if tag in tags:
            return index


def get_pkg_depends(pkg):
    depends_list = []
    rec = []
    if not (cache[pkg].version_list == []) and (depcache.get_candidate_ver(
            cache[pkg]) is not None):
        version = depcache.get_candidate_ver(cache[pkg])
        try:
            depends_list = version.depends_list_str["Depends"]
        except:
            depends_list = []
        try:
            rec = version.depends_list_str["Recommends"]
        except:
            rec = []

    elif not cache[pkg].provides_list == []:
        for pkgs in cache[pkg].provides_list:
            version = pkgs[2]
            try:
                depends_list = version.depends_list_str["Depends"]
            except:
                depends_list = []
            try:
                rec = version.depends_list_str["Recommends"]
            except:
                rec = []
    return(depends_list, rec)

packages = {}

apt_pkg.init()
cache = apt_pkg.Cache()
depcache = apt_pkg.DepCache(cache)
infos = apt_pkg.PackageRecords(cache)

for item in aiddir:
    if item.partition(".desktop")[-2] == ".desktop":
        try:
            single_pkg = DE.DesktopEntry(base_folder+item)
        except xdg.Exceptions.ParsingError:
            print("fail to parse %s" % item)
        except ParsingError:
            print("fail to parse %s" % item)
        name = single_pkg.getName()
        pkg = single_pkg.get("X-AppInstall-Package")
        icon = single_pkg.get("Icon")
        categs = single_pkg.getCategories()
        if categs == []:
            categs = [u"Other"]
        comment = single_pkg.get("Comment")
        dep_list = []
        rec_list = []
        if (pkg in cache) and (cache[pkg].has_versions):
            try:
                deps = get_pkg_depends(pkg)
                for items in deps[0]:
                    dep_list.append(items[0][0])
                for items in deps[1]:
                    rec_list.append(items[0][0])
                ver = depcache.get_candidate_ver(cache[pkg])
                infos.lookup(ver.translated_description.file_list[0])
                desc = infos.long_desc
                if comment == u'':
                    comment = infos.short_desc.decode("UTF-8").capitalize()
                packages[pkg] = [
                    categs,
                    name.capitalize(),
                    comment,
                    icon,
                    desc,
                    ";".join(dep_list),
                    ";".join(rec_list)
                ]
            except AttributeError: pass

        else:
            print("%s: package not found" % pkg)

app_tags = {}
cat_parser = RawConfigParser()
cat_parser.readfp(tags_file)
cursor.execute(
    "CREATE TABLE tables(id, contains, showboth, name, comment, icon)")
for section in cat_parser.sections():
    cursor.execute("INSERT INTO tables VALUES (?, ?, ?, ?, ?, ?)", (
        section,
        cat_parser.get(section, "contains"),
        cat_parser.get(section, "showboth"),
        cat_parser.get(section, "name"),
        cat_parser.get(section, "comment"),
        cat_parser.get(section, "icon")
    ))
    categ_string = "CREATE TABLE %s(name, pkg_name, tags, comment, icon, \
        desc, deps, recs, ID)" % section
    print("Creating table %s" % section)
    cursor.execute(categ_string)
    app_tags[section] = cat_parser.get(section, "contains")


def in_cat(tags):
    tag_list = ["packages"]
    for tag in tags:
        for item in app_tags.items():
            if tag in item[1].strip(";").split(";"):
                if not item[0] in tag_list:
                    tag_list.append(item[0])
    return tag_list

for package in cache.packages:
    pkg = package.name
    if package.architecture == arch:
        if package.has_versions:
            try:
                if pkg in packages:
                    id = 0
                    cat = ";".join(packages[pkg][0])
                    name = packages[pkg][1].decode("UTF-8")
                    comment = packages[pkg][2].decode("UTF-8")
                    icon = packages[pkg][3]
                    desc = packages[pkg][4].decode("UTF-8")
                    deps = packages[pkg][5]
                    rec = packages[pkg][6]
                else:
                    id = 1
                    ver = depcache.get_candidate_ver(package)
                    infos.lookup(ver.translated_description.file_list[0])
                    cat = package.section.replace("multiverse/", "").replace(
                        "universe/", "").replace("restricted/", "")
                    name = pkg.capitalize()
                    comment = infos.short_desc
                    icon = u"deb"
                    desc = infos.long_desc
                    deps_func = get_pkg_depends(pkg)
                    dep_list = []
                    rec_list = []
                    for items in deps_func[0]:
                        dep_list.append(items[0][0])
                    for items in deps_func[1]:
                        rec_list.append(items[0][0])
                    deps = ";".join(dep_list)
                    recs = ";".join(rec_list)
                for items in in_cat(cat.split(";")):
                    cursor.execute(
                        "INSERT INTO %s VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?)" %
                        items, (name, pkg, cat, comment,
                                icon, desc, deps, recs, id))
            except:
                print("%s: not found" % pkg)

print("Done")
db.commit()