1 | # -*- coding: UTF-8 -*- |
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2 | # |
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3 | # PyKota : Print Quotas for CUPS |
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4 | # |
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5 | # (c) 2003, 2004, 2005, 2006, 2007, 2008 Jerome Alet <alet@librelogiciel.com> |
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6 | # This program is free software: you can redistribute it and/or modify |
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7 | # it under the terms of the GNU General Public License as published by |
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8 | # the Free Software Foundation, either version 3 of the License, or |
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9 | # (at your option) any later version. |
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10 | # |
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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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17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | # |
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19 | # $Id$ |
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20 | # |
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21 | |
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22 | """This modules defines a command line options parser for PyKota's command line tools.""" |
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23 | |
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24 | import sys |
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25 | import os |
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26 | import optparse |
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27 | from gettext import gettext as _ |
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28 | |
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29 | from pykota import version |
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30 | |
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31 | class PyKotaOptionParser(optparse.OptionParser) : |
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32 | """ |
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33 | This class to define additional methods, and different help |
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34 | formatting, from the traditional OptionParser. |
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35 | """ |
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36 | def __init__(self, *args, **kwargs) : |
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37 | """ |
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38 | Initializes our option parser with additional attributes. |
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39 | """ |
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40 | self.examples = [] |
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41 | optparse.OptionParser.__init__(self, *args, **kwargs) |
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42 | self.disable_interspersed_args() |
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43 | self.add_option("-v", "--version", |
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44 | action="store_true", |
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45 | dest="version", |
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46 | help=_("show %prog's version number and exit.")) |
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47 | |
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48 | def format_help(self, formatter=None) : |
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49 | """ |
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50 | Reformats help our way : adding examples and copyright |
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51 | message at the end. |
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52 | """ |
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53 | if formatter is None : |
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54 | formatter = self.formatter |
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55 | result = [] |
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56 | result.append(optparse.OptionParser.format_help(self, formatter) + "\n") |
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57 | result.append(self.format_examples() + "\n") |
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58 | result.append(self.format_copyright() + "\n") |
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59 | return "".join(result) |
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60 | |
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61 | def format_examples(self, formatter=None) : |
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62 | """Formats examples our way.""" |
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63 | if formatter is None : |
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64 | formatter = self.formatter |
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65 | result = [] |
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66 | if self.examples : |
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67 | result.append(formatter.format_heading(_("examples"))) |
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68 | formatter.indent() |
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69 | for (cmd, explanation) in self.examples : |
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70 | result.append(formatter.format_description(self.expand_prog_name(cmd))) |
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71 | result.append(formatter.format_description(self.expand_prog_name(explanation)) + "\n") |
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72 | formatter.dedent() |
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73 | return "".join(result) |
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74 | |
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75 | def format_copyright(self, formatter=None) : |
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76 | """Formats copyright message our way.""" |
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77 | if formatter is None : |
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78 | formatter = self.formatter |
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79 | result = [] |
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80 | result.append(formatter.format_heading(_("licensing terms"))) |
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81 | formatter.indent() |
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82 | result.append(formatter.format_description("(c) %s %s\n" \ |
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83 | % (version.__years__, \ |
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84 | version.__author__))) |
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85 | for part in version.__gplblurb__.split("\n\n") : |
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86 | result.append(formatter.format_description(part) + "\n") |
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87 | formatter.dedent() |
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88 | return "".join(result) |
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89 | |
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90 | def add_example(self, command, doc) : |
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91 | """Adds an usage example.""" |
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92 | self.examples.append(("%prog " + command, doc)) |
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93 | |
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94 | def parse_args(self, args=None, values=None) : |
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95 | """Parses command line arguments, and handles -v|--version as well.""" |
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96 | (options, arguments) = optparse.OptionParser.parse_args(self, args, values) |
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97 | if options.version : |
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98 | sys.stdout.write("%s (PyKota) %s\n" % (os.path.basename(sys.argv[0]), |
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99 | version.__version__)) |
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100 | sys.exit(0) |
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101 | return (options, arguments) |
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