Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/namespaces.py @ 23716:f4828a8f6ae9

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namespaces: copy implementation to new namespace object
author Sean Farley <sean.michael.farley@gmail.com>
date Fri, 19 Dec 2014 17:17:17 -0800
parents eee55c09010a
children d8663e6153c1
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1 from i18n import _
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2 from mercurial import util
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3 import templatekw
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4
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5 def tolist(val):
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6 """
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7 a convenience method to return an empty list instead of None
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8 """
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9 if val is None:
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10 return []
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11 else:
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12 return [val]
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13
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14 class namespaces(object):
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15 """
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16 provides an interface to register a generic many-to-many mapping between
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17 some (namespaced) names and nodes. The goal here is to control the
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18 pollution of jamming things into tags or bookmarks (in extension-land) and
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19 to simplify internal bits of mercurial: log output, tab completion, etc.
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20
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21 More precisely, we define a list of names (the namespace), a mapping of
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22 names to nodes, and a mapping from nodes to names. Each mapping
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23 returns a list of nodes.
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24
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25 Furthermore, each name mapping will be passed a name to lookup which might
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26 not be in its domain. In this case, each method should return an empty list
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27 and not raise an error.
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28
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29 We'll have a dictionary '_names' where each key is a namespace and
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30 its value is a dictionary of functions:
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31 'templatename': name to use for templating (usually the singular form
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32 of the plural namespace name)
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33 'namemap': function that takes a name and returns a list of nodes
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34 'nodemap': function that takes a node and returns a list of names
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35 """
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36
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37 _names_version = 0
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38
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39 def __init__(self):
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40 self._names = util.sortdict()
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41
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42 addns = self.addnamespace
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43
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44 # we need current mercurial named objects (bookmarks, tags, and
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45 # branches) to be initialized somewhere, so that place is here
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46 addns("bookmarks", "bookmark",
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47 lambda repo, name: tolist(repo._bookmarks.get(name)),
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48 lambda repo, name: repo.nodebookmarks(name))
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49
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50 addns("tags", "tag",
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51 lambda repo, name: tolist(repo._tagscache.tags.get(name)),
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52 lambda repo, name: repo.nodetags(name))
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53
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54 addns("branches", "branch",
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55 lambda repo, name: tolist(repo.branchtip(name)),
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56 lambda repo, node: [repo[node].branch()])
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57
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58 def addnamespace(self, namespace, templatename, namemap, nodemap,
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59 order=None):
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60 """
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61 register a namespace
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62
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63 namespace: the name to be registered (in plural form)
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64 templatename: the name to use for templating
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65 namemap: function that inputs a node, output name(s)
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66 nodemap: function that inputs a name, output node(s)
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67 order: optional argument to specify the order of namespaces
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68 (e.g. 'branches' should be listed before 'bookmarks')
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69 """
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70 val = {'templatename': templatename,
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71 'namemap': namemap,
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72 'nodemap': nodemap}
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73 if order is not None:
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74 self._names.insert(order, namespace, val)
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75 else:
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76 self._names[namespace] = val
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77
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78 # we only generate a template keyword if one does not already exist
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79 if namespace not in templatekw.keywords:
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80 def generatekw(**args):
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81 return templatekw.shownames(namespace, **args)
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82
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83 templatekw.keywords[namespace] = generatekw
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84
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85 def singlenode(self, repo, name):
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86 """
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87 Return the 'best' node for the given name. Best means the first node
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88 in the first nonempty list returned by a name-to-nodes mapping function
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89 in the defined precedence order.
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90
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91 Raises a KeyError if there is no such node.
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92 """
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93 for ns, v in self._names.iteritems():
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94 n = v['namemap'](repo, name)
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95 if n:
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96 # return max revision number
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97 if len(n) > 1:
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98 cl = repo.changelog
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99 maxrev = max(cl.rev(node) for node in n)
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100 return cl.node(maxrev)
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101 return n[0]
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102 raise KeyError(_('no such name: %s') % name)
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103
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104 def templatename(self, namespace):
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105 """method that returns the template name of a namespace"""
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106 return self._names[namespace]['templatename']
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107
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108 def names(self, repo, namespace, node):
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109 """method that returns a (sorted) list of names in a namespace that
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110 match a given node"""
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111 return sorted(self._names[namespace]['nodemap'](repo, node))
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112
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113 class namespace(object):
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114 """provides an interface to a namespace
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115
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116 Namespaces are basically generic many-to-many mapping between some
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117 (namespaced) names and nodes. The goal here is to control the pollution of
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118 jamming things into tags or bookmarks (in extension-land) and to simplify
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119 internal bits of mercurial: log output, tab completion, etc.
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120
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121 More precisely, we define a mapping of names to nodes, and a mapping from
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122 nodes to names. Each mapping returns a list.
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123
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124 Furthermore, each name mapping will be passed a name to lookup which might
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125 not be in its domain. In this case, each method should return an empty list
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126 and not raise an error.
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127
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128 This namespace object will define the properties we need:
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129 'name': the namespace (plural form)
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130 'templatename': name to use for templating (usually the singular form
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131 of the plural namespace name)
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132 'namemap': function that takes a name and returns a list of nodes
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133 'nodemap': function that takes a node and returns a list of names
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134
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135 """
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136
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137 def __init__(self, name, templatename, namemap, nodemap):
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138 """create a namespace
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139
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140 name: the namespace to be registered (in plural form)
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141 templatename: the name to use for templating
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142 namemap: function that inputs a node, output name(s)
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143 nodemap: function that inputs a name, output node(s)
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144
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145 """
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146 self.name = name
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147 self.templatename = templatename
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148 self.namemap = namemap
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149 self.nodemap = nodemap
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150
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151 def names(self, repo, node):
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152 """method that returns a (sorted) list of names in a namespace that
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153 match a given node"""
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154 return sorted(self.nodemap(repo, node))