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annotate piecrust/commands/builtin/scaffolding.py @ 187:d5b7c2a4ec9d

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prepare: Add user-defined scaffolding templates. Any files found in `scaffold/pages` will be used as possible templates for the `chef prepare` command, in addition to the default ones.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 04 Jan 2015 15:49:31 -0800
parents 8355eb9dd8fe
children f130365568ff
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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 glob
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7 import logging
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8 import textwrap
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9 from piecrust import RESOURCES_DIR
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10 from piecrust.chefutil import print_help_item
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11 from piecrust.commands.base import ExtendableChefCommand, ChefCommandExtension
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12 from piecrust.sources.base import IPreparingSource, MODE_CREATING
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13 from piecrust.uriutil import multi_replace
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14
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15
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16 logger = logging.getLogger(__name__)
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17
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18
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19 def make_title(slug):
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20 slug = re.sub(r'[\-_]', ' ', slug)
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21 return slug.title()
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23
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24 class PrepareCommand(ExtendableChefCommand):
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25 """ Chef command for creating pages with some default content.
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26 """
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27 def __init__(self):
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28 super(PrepareCommand, self).__init__()
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29 self.name = 'prepare'
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30 self.description = "Prepares new content for your website."
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31
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32 def setupParser(self, parser, app):
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33 # Don't setup anything if this is a null app
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34 # (for when `chef` is run from outside a website)
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35 if app.root_dir is None:
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36 return
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37
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38 subparsers = parser.add_subparsers()
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39 for src in app.sources:
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40 if not isinstance(src, IPreparingSource):
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41 logger.debug("Skipping source '%s' because it's not "
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42 "preparable." % src.name)
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43 continue
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44 if src.is_theme_source:
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45 logger.debug("Skipping source '%s' because it's a theme "
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46 "source." % src.name)
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47 continue
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48 p = subparsers.add_parser(
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49 src.item_name,
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50 help=("Creates an empty page in the '%s' source." %
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51 src.name))
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52 src.setupPrepareParser(p, app)
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53 p.add_argument('-t', '--template', default='default',
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54 help="The template to use, which will change the "
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55 "generated text and header.")
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56 p.set_defaults(source=src)
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57
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58 def run(self, ctx):
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59 if not hasattr(ctx.args, 'source'):
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60 raise Exception("No source specified. "
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61 "Please run `chef prepare -h` for usage.")
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62
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63 app = ctx.app
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64 source = ctx.args.source
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65 metadata = source.buildMetadata(ctx.args)
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66 rel_path, metadata = source.findPagePath(metadata, MODE_CREATING)
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67 path = source.resolveRef(rel_path)
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68 name, ext = os.path.splitext(path)
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69 if ext == '.*':
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70 path = '%s.%s' % (
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71 name,
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72 app.config.get('site/default_auto_format'))
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73 if os.path.exists(path):
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74 raise Exception("'%s' already exists." % path)
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75
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76 tpl_name = ctx.args.template
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77 extensions = self.getExtensions(app)
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78 ext = next(
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79 filter(
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80 lambda e: tpl_name in e.getTemplateNames(ctx.app),
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81 extensions),
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82 None)
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83 if ext is None:
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84 raise Exception("No such page template: %s" % tpl_name)
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85
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86 tpl_text = ext.getTemplate(ctx.app, tpl_name)
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87 if tpl_text is None:
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88 raise Exception("Error loading template: %s" % tpl_name)
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89 title = (metadata.get('slug') or metadata.get('path') or
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90 'Untitled page')
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91 title = make_title(title)
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92 tokens = {
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93 '%title%': title,
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94 '%time.today%': time.strftime('%Y/%m/%d'),
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95 '%time.now%': time.strftime('%H:%M:%S')}
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96 tpl_text = multi_replace(tpl_text, tokens)
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97
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98 logger.info("Creating page: %s" % os.path.relpath(path, app.root_dir))
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99 if not os.path.exists(os.path.dirname(path)):
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100 os.makedirs(os.path.dirname(path), 0o755)
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101
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102 with open(path, 'w') as f:
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103 f.write(tpl_text)
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104
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105
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106 class DefaultPrepareTemplatesCommandExtension(ChefCommandExtension):
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107 """ Provides the default scaffolding templates to the `prepare`
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108 command.
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109 """
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110 def __init__(self):
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111 super(DefaultPrepareTemplatesCommandExtension, self).__init__()
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112 self.command_name = 'prepare'
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113
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114 def getTemplateNames(self, app):
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115 return ['default', 'rss', 'atom']
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116
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117 def getTemplateDescription(self, app, name):
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118 descs = {
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119 'default': "The default template, for a simple page.",
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120 'rss': "A fully functional RSS feed.",
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121 'atom': "A fully functional Atom feed."}
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122 return descs[name]
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123
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124 def getTemplate(self, app, name):
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125 assert name in ['default', 'rss', 'atom']
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126 src_path = os.path.join(RESOURCES_DIR, 'prepare', '%s.html' % name)
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127 with open(src_path, 'r', encoding='utf8') as fp:
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128 return fp.read()
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129
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130
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131 class UserDefinedPrepareTemplatesCommandExtension(ChefCommandExtension):
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132 """ Provides user-defined scaffolding templates to the `prepare`
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133 command.
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134 """
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135 def __init__(self):
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136 super(UserDefinedPrepareTemplatesCommandExtension, self).__init__()
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137 self.command_name = 'prepare'
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138
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139 def _getTemplatesDir(self, app):
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140 return os.path.join(app.root_dir, 'scaffold/pages')
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141
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142 def supports(self, app):
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143 return os.path.isdir(self._getTemplatesDir(app))
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144
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145 def getTemplateNames(self, app):
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146 names = os.listdir(self._getTemplatesDir(app))
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147 return map(lambda n: os.path.splitext(n)[0], names)
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148
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149 def getTemplateDescription(self, app, name):
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150 return "User-defined template."
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151
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152 def getTemplate(self, app, name):
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153 templates_dir = self._getTemplatesDir(app)
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154 pattern = os.path.join(templates_dir, '%s.*' % name)
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155 matches = glob.glob(pattern)
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156 if not matches:
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157 raise Exception("No such page scaffolding template: %s" % name)
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158 if len(matches) > 1:
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159 raise Exception(
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160 "More than one scaffolding template has name: %s" % name)
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161 with open(matches[0], 'r', encoding='utf8') as fp:
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162 return fp.read()
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163
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164
100
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165 class DefaultPrepareTemplatesHelpTopic(ChefCommandExtension):
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166 """ Provides help topics for the `prepare` command.
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167 """
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168 command_name = 'help'
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169
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170 def getHelpTopics(self):
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171 return [('scaffolding',
165
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172 "Available templates for the 'prepare' command.")]
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173
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174 def getHelpTopic(self, topic, app):
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175 with io.StringIO() as tplh:
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176 extensions = app.plugin_loader.getCommandExtensions()
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177 for e in extensions:
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178 if e.command_name == 'prepare' and e.supports(app):
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179 for n in e.getTemplateNames(app):
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180 d = e.getTemplateDescription(app, n)
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181 print_help_item(tplh, n, d)
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182 help_list = tplh.getvalue()
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183
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184 help_txt = (
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185 textwrap.fill(
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186 "Running the 'prepare' command will let "
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187 "PieCrust setup a page for you in the correct place, with "
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188 "some hopefully useful default text.") +
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189 "\n\n" +
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190 textwrap.fill("The following templates are available:") +
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191 "\n\n" +
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192 help_list)
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193 return help_txt
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194