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annotate piecrust/commands/builtin/scaffolding.py @ 100:69d5eecfa449

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Better `prepare` command, with templates and help topics.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 13 Sep 2014 23:31:21 -0700
parents
children 8355eb9dd8fe
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rev   line source
100
69d5eecfa449 Better `prepare` command, with templates and help topics.
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1 import os
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2 import os.path
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3 import re
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4 import io
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5 import time
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6 import logging
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7 import textwrap
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8 from piecrust import RESOURCES_DIR
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9 from piecrust.chefutil import print_help_item
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10 from piecrust.commands.base import ExtendableChefCommand, ChefCommandExtension
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11 from piecrust.sources.base import IPreparingSource, MODE_CREATING
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12 from piecrust.uriutil import multi_replace
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13
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14
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15 logger = logging.getLogger(__name__)
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16
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17
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18 def make_title(slug):
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19 slug = re.sub(r'[\-_]', ' ', slug)
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20 return slug.title()
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21
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22
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23 class PrepareCommand(ExtendableChefCommand):
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24 """ Chef command for creating pages with some default content.
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25 """
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26 def __init__(self):
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27 super(PrepareCommand, self).__init__()
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28 self.name = 'prepare'
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29 self.description = "Prepares new content for your website."
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30
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31 def setupParser(self, parser, app):
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32 # Don't setup anything if this is a null app
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33 # (for when `chef` is run from outside a website)
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34 if app.root_dir is None:
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35 return
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36
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37 subparsers = parser.add_subparsers()
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38 for src in app.sources:
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39 if not isinstance(src, IPreparingSource):
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40 logger.debug("Skipping source '%s' because it's not "
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41 "preparable." % src.name)
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42 continue
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43 if src.is_theme_source:
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44 logger.debug("Skipping source '%s' because it's a theme "
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45 "source." % src.name)
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46 continue
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47 p = subparsers.add_parser(
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48 src.item_name,
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49 help="Creates an empty page in the '%s' source." % src.name)
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50 src.setupPrepareParser(p, app)
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51 p.add_argument('-t', '--template', default='default',
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52 help="The template to use, which will change the "
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53 "generated text and header.")
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54 p.set_defaults(source=src)
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55
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56 def run(self, ctx):
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57 app = ctx.app
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58 source = ctx.args.source
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59 metadata = source.buildMetadata(ctx.args)
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60 rel_path, metadata = source.findPagePath(metadata, MODE_CREATING)
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61 path = source.resolveRef(rel_path)
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62 name, ext = os.path.splitext(path)
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63 if ext == '.*':
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64 path = '%s.%s' % (name,
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65 app.config.get('site/default_auto_format'))
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66 if os.path.exists(path):
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67 raise Exception("'%s' already exists." % path)
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68
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69 tpl_name = ctx.args.template
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70 extensions = self.getExtensions(app)
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71 ext = next(
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72 filter(
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73 lambda e: tpl_name in e.getTemplateNames(ctx.app),
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74 extensions),
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75 None)
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76 if ext is None:
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77 raise Exception("No such page template: %s" % tpl_name)
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78
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79 tpl_text = ext.getTemplate(ctx.app, tpl_name)
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80 title = (metadata.get('slug') or metadata.get('path') or
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81 'Untitled page')
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82 title = make_title(title)
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83 tokens = {
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84 '%title%': title,
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85 '%time.today%': time.strftime('%Y/%m/%d'),
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86 '%time.now%': time.strftime('%H:%M:%S')}
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87 tpl_text = multi_replace(tpl_text, tokens)
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88
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89 logger.info("Creating page: %s" % os.path.relpath(path, app.root_dir))
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90 if not os.path.exists(os.path.dirname(path)):
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91 os.makedirs(os.path.dirname(path), 0o755)
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92
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93 with open(path, 'w') as f:
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94 f.write(tpl_text)
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95
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96
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97 class DefaultPrepareTemplatesCommandExtension(ChefCommandExtension):
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98 """ Provides the default scaffolding tempaltes to the `prepare`
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99 command.
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100 """
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101 def __init__(self):
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102 super(DefaultPrepareTemplatesCommandExtension, self).__init__()
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103 self.command_name = 'prepare'
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104
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105 def getTemplateNames(self, app):
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106 return ['default', 'rss', 'atom']
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107
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108 def getTemplateDescription(self, app, name):
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109 descs = {
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110 'default': "The default template, for a simple page.",
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111 'rss': "A fully functional RSS feed.",
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112 'atom': "A fully functional Atom feed."}
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113 return descs[name]
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114
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115 def getTemplate(self, app, name):
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116 assert name in ['default', 'rss', 'atom']
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117 src_path = os.path.join(RESOURCES_DIR, 'prepare', '%s.html' % name)
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118 with open(src_path, 'r', encoding='utf8') as fp:
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119 return fp.read()
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120
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121
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122 class DefaultPrepareTemplatesHelpTopic(ChefCommandExtension):
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123 """ Provides help topics for the `prepare` command.
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124 """
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125 command_name = 'help'
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126
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127 def getHelpTopics(self):
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128 return [('scaffolding',
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129 "Available templates for the 'prepare' command.")]
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130
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131 def getHelpTopic(self, topic, app):
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132 with io.StringIO() as tplh:
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133 extensions = app.plugin_loader.getCommandExtensions()
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134 for e in extensions:
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135 if e.command_name == 'prepare' and e.supports(app):
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136 for n in e.getTemplateNames(app):
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137 d = e.getTemplateDescription(app, n)
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138 print_help_item(tplh, n, d)
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139 help_list = tplh.getvalue()
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140
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141 help_txt = (
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142 textwrap.fill("Running the 'prepare' command will let "
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143 "PieCrust setup a page for you in the correct place, with "
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144 "some hopefully useful default text.") +
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145 "\n\n" +
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146 textwrap.fill("The following templates are available:") +
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147 "\n\n" +
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148 help_list)
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149 return help_txt
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150