[3260] | 1 | # -*- coding: UTF-8 -*- |
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[695] | 2 | # |
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[3260] | 3 | # PyKota : Print Quotas for CUPS |
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[695] | 4 | # |
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[3275] | 5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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[3260] | 6 | # This program is free software: you can redistribute it and/or modify |
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[873] | 7 | # it under the terms of the GNU General Public License as published by |
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[3260] | 8 | # the Free Software Foundation, either version 3 of the License, or |
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[873] | 9 | # (at your option) any later version. |
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[3260] | 10 | # |
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[873] | 11 | # This program is distributed in the hope that it will be useful, |
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| 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | # GNU General Public License for more details. |
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| 15 | # |
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| 16 | # You should have received a copy of the GNU General Public License |
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[3260] | 17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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[695] | 18 | # |
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| 19 | # $Id$ |
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| 20 | # |
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[3294] | 21 | |
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| 22 | """This module defines some utility functions which make no sense as methods.""" |
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| 23 | |
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| 24 | import sys |
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[3295] | 25 | import os |
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[3294] | 26 | import locale |
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| 27 | import gettext |
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[3310] | 28 | from types import UnicodeType |
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[3294] | 29 | |
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[3318] | 30 | from pykota.errors import PyKotaCommandLineError |
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| 31 | |
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[3294] | 32 | def initlocale(lang="", cset=None) : |
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| 33 | """Initializes the locale stuff.""" |
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| 34 | try : |
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| 35 | locale.setlocale(locale.LC_ALL, (lang, cset)) |
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| 36 | except (locale.Error, IOError) : |
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| 37 | locale.setlocale(locale.LC_ALL, None) |
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| 38 | (language, charset) = locale.getlocale() |
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| 39 | language = language or "C" |
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| 40 | try : |
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| 41 | charset = charset or locale.getpreferredencoding() |
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| 42 | except locale.Error : |
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| 43 | charset = sys.stdout.encoding or sys.getfilesystemencoding() |
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| 44 | |
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[3298] | 45 | if (not charset) or charset in ("ASCII", "ANSI_X3.4-1968") : |
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[3294] | 46 | charset = "UTF-8" |
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[3298] | 47 | |
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[3294] | 48 | return (language, charset) |
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| 49 | |
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[3298] | 50 | def setenv(varname, value, charset) : |
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| 51 | """Sets an environment variable.""" |
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| 52 | if value is None : |
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| 53 | value = "None" |
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| 54 | os.environ[varname] = value.encode(charset, "replace") |
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| 55 | |
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[3294] | 56 | def initgettext(lang, cset) : |
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| 57 | """Initializes gettext translations for PyKota.""" |
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| 58 | try : |
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| 59 | try : |
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| 60 | trans = gettext.translation("pykota", \ |
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| 61 | languages=["%s.%s" % (lang, |
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| 62 | cset)], |
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| 63 | codeset=cset) |
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| 64 | except TypeError : # Python <2.4 |
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| 65 | trans = gettext.translation("pykota", |
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| 66 | languages=["%s.%s" % (lang, |
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| 67 | cset)]) |
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| 68 | trans.install(unicode=True) |
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| 69 | except : |
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| 70 | gettext.NullTranslations().install(unicode=True) |
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[3295] | 71 | |
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| 72 | def getpreferredlanguage() : |
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| 73 | """Returns the preferred language.""" |
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| 74 | languages = os.environ.get("HTTP_ACCEPT_LANGUAGE", "") |
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| 75 | langs = [l.strip().split(';')[0] for l in languages.split(",")] |
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| 76 | return langs[0].replace("-", "_") |
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| 77 | |
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| 78 | def getpreferredcharset() : |
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| 79 | """Returns the preferred charset.""" |
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| 80 | charsets = os.environ.get("HTTP_ACCEPT_CHARSET", "UTF-8") |
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| 81 | charsets = [l.strip().split(';')[0] for l in charsets.split(",")] |
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| 82 | return charsets[0] |
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[3294] | 83 | |
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[3295] | 84 | def reinitcgilocale() : |
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| 85 | """Reinitializes the locale and gettext translations for CGI scripts, according to browser's preferences.""" |
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| 86 | initgettext(*initlocale(getpreferredlanguage(), getpreferredcharset())) |
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| 87 | |
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| 88 | def N_(message) : |
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| 89 | """Fake translation marker for translatable strings extraction.""" |
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| 90 | return message |
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| 91 | |
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[3294] | 92 | def databaseToUnicode(text) : |
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[3298] | 93 | """Converts from database format (UTF-8) to unicode. |
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| 94 | |
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| 95 | We use "replace" to accomodate legacy datas which may not |
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| 96 | have been recorded correctly. |
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| 97 | """ |
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[3294] | 98 | if text is not None : |
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[3310] | 99 | if not isinstance(text, UnicodeType) : |
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| 100 | return text.decode("UTF-8", "replace") |
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| 101 | else : |
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| 102 | # MySQL already returns unicode objects |
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| 103 | return text |
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[3294] | 104 | else : |
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| 105 | return None |
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| 106 | |
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| 107 | def unicodeToDatabase(text) : |
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| 108 | """Converts from unicode to database format (UTF-8).""" |
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| 109 | if text is not None : |
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[3298] | 110 | return text.encode("UTF-8") |
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[3294] | 111 | else : |
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| 112 | return None |
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| 113 | |
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[3354] | 114 | def getdefaultcharset() : |
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| 115 | """Returns the default charset to use.""" |
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| 116 | return sys.stdout.encoding or locale.getlocale()[1] or "ANSI_X3.4-1968" |
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| 117 | |
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[3294] | 118 | def logerr(text) : |
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| 119 | """Logs an unicode text to stderr.""" |
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[3354] | 120 | sys.stderr.write(text.encode(getdefaultcharset(), "replace")) |
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[3295] | 121 | sys.stderr.flush() |
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[3318] | 122 | |
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[3354] | 123 | def loginvalidparam(opt, value, defaultvalue=None, additionalinfo=None) : |
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[3318] | 124 | """Logs an error when an invalid parameter to a command line option |
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| 125 | is encountered. |
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| 126 | """ |
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[3354] | 127 | message = _("Invalid value '%(value)s' for the %(opt)s command line option") \ |
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[3318] | 128 | % locals() |
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[3354] | 129 | if defaultvalue is not None : |
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| 130 | message += ", using default '%(defaultvalue)s' instead" % locals() |
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[3318] | 131 | if additionalinfo : |
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| 132 | logerr("%s (%s)\n" % (message, additionalinfo)) |
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| 133 | else : |
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| 134 | logerr("%s\n" % message) |
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[3294] | 135 | |
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[3295] | 136 | def crashed(message="Bug in PyKota") : |
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| 137 | """Minimal crash method.""" |
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| 138 | import traceback |
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| 139 | from pykota.version import __version__ |
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| 140 | lines = [] |
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| 141 | for line in traceback.format_exception(*sys.exc_info()) : |
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[3354] | 142 | line = line.decode(getdefaultcharset(), "replace") |
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[3295] | 143 | lines.extend([l for l in line.split("\n") if l]) |
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| 144 | msg = "ERROR: ".join(["%s\n" % l for l in (["ERROR: PyKota v%s" % __version__, message] + lines)]) |
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| 145 | logerr(msg) |
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| 146 | return msg |
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[3318] | 147 | |
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| 148 | def run(optparser, workclass, requireargs=False) : |
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| 149 | """Runs a PyKota command line tool.""" |
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| 150 | appname = os.path.basename(sys.argv[0]) |
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| 151 | retcode = 0 |
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| 152 | (options, arguments) = optparser.parse_args() |
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| 153 | if requireargs and not arguments : |
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| 154 | logerr("%s\n" % (_("%(appname)s requires arguments, please use --help") \ |
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| 155 | % locals())) |
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| 156 | retcode = -1 |
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[3321] | 157 | application = None |
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[3318] | 158 | try : |
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| 159 | try : |
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[3321] | 160 | application = workclass() |
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| 161 | application.deferredInit() |
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| 162 | retcode = application.main(arguments, options) |
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| 163 | except KeyboardInterrupt : |
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| 164 | logerr("\nInterrupted with Ctrl+C !\n") |
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| 165 | retcode = -3 |
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| 166 | except PyKotaCommandLineError, msg : |
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| 167 | logerr("%s : %s\n" % (sys.argv[0], msg)) |
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| 168 | retcode = -2 |
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| 169 | except SystemExit : |
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| 170 | pass |
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| 171 | except : |
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| 172 | title = _("%(appname)s failed") % locals() |
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| 173 | try : |
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| 174 | application.crashed(title) |
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| 175 | except : |
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| 176 | crashed(title) |
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| 177 | retcode = -1 |
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| 178 | finally : |
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| 179 | try : |
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| 180 | application.storage.close() |
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[3318] | 181 | except : |
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[3321] | 182 | pass |
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| 183 | |
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[3318] | 184 | sys.exit(retcode) |
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