annotate mercurial/namespaces.py @ 23760:50229b4c33be

namespaces: add 'listnames' property Currently, we have no way to list all the names in a given namespace. This is needed for things such as tab completion. Future patches will use this patch for exactly that purpose.
author Sean Farley <sean.michael.farley@gmail.com>
date Mon, 15 Dec 2014 14:09:00 -0800
parents b8b246cffdee
children 19d6271a70db
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 """provides an interface to register and operate on multiple namespaces. See
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16 the namespace class below for details on the namespace object.
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17
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18 """
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19
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20 _names_version = 0
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21
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22 def __init__(self):
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23 self._names = util.sortdict()
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24
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25 # shorten the class name for less indentation
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26 ns = namespace
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27
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28 # we need current mercurial named objects (bookmarks, tags, and
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29 # branches) to be initialized somewhere, so that place is here
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30 n = ns("bookmarks", "bookmark",
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31 lambda repo: repo._bookmarks.keys(),
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32 lambda repo, name: tolist(repo._bookmarks.get(name)),
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33 lambda repo, name: repo.nodebookmarks(name))
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34 self.addnamespace(n)
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35
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36 n = ns("tags", "tag",
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37 lambda repo: [t for t, n in repo.tagslist()],
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38 lambda repo, name: tolist(repo._tagscache.tags.get(name)),
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39 lambda repo, name: repo.nodetags(name))
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40 self.addnamespace(n)
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41
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42 n = ns("branches", "branch",
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43 lambda repo: repo.branchmap().keys(),
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44 lambda repo, name: tolist(repo.branchtip(name)),
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45 lambda repo, node: [repo[node].branch()])
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46 self.addnamespace(n)
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47
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48 def __getitem__(self, namespace):
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49 """returns the namespace object"""
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50 return self._names[namespace]
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51
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52 def addnamespace(self, namespace, order=None):
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53 """register a namespace
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54
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55 namespace: the name to be registered (in plural form)
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56 order: optional argument to specify the order of namespaces
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57 (e.g. 'branches' should be listed before 'bookmarks')
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58
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59 """
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60 if order is not None:
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61 self._names.insert(order, namespace.name, namespace)
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62 else:
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63 self._names[namespace.name] = namespace
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64
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65 # we only generate a template keyword if one does not already exist
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66 if namespace.name not in templatekw.keywords:
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67 def generatekw(**args):
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68 return templatekw.shownames(namespace.name, **args)
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69
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70 templatekw.keywords[namespace.name] = generatekw
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71
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72 def singlenode(self, repo, name):
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73 """
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74 Return the 'best' node for the given name. Best means the first node
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75 in the first nonempty list returned by a name-to-nodes mapping function
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76 in the defined precedence order.
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77
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78 Raises a KeyError if there is no such node.
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79 """
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80 for ns, v in self._names.iteritems():
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81 n = v.namemap(repo, name)
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82 if n:
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83 # return max revision number
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84 if len(n) > 1:
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85 cl = repo.changelog
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86 maxrev = max(cl.rev(node) for node in n)
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87 return cl.node(maxrev)
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88 return n[0]
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89 raise KeyError(_('no such name: %s') % name)
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90
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91 class namespace(object):
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92 """provides an interface to a namespace
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93
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94 Namespaces are basically generic many-to-many mapping between some
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95 (namespaced) names and nodes. The goal here is to control the pollution of
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96 jamming things into tags or bookmarks (in extension-land) and to simplify
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97 internal bits of mercurial: log output, tab completion, etc.
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98
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99 More precisely, we define a mapping of names to nodes, and a mapping from
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100 nodes to names. Each mapping returns a list.
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101
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102 Furthermore, each name mapping will be passed a name to lookup which might
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103 not be in its domain. In this case, each method should return an empty list
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104 and not raise an error.
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105
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106 This namespace object will define the properties we need:
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107 'name': the namespace (plural form)
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108 'templatename': name to use for templating (usually the singular form
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109 of the plural namespace name)
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110 'listnames': list of all names in the namespace (usually the keys of a
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111 dictionary)
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112 'namemap': function that takes a name and returns a list of nodes
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113 'nodemap': function that takes a node and returns a list of names
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114
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115 """
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116
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117 def __init__(self, name, templatename, listnames, namemap, nodemap):
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118 """create a namespace
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119
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120 name: the namespace to be registered (in plural form)
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121 listnames: function to list all names
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122 templatename: the name to use for templating
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123 namemap: function that inputs a node, output name(s)
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124 nodemap: function that inputs a name, output node(s)
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125
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126 """
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127 self.name = name
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128 self.templatename = templatename
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129 self.listnames = listnames
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130 self.namemap = namemap
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131 self.nodemap = nodemap
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132
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133 def names(self, repo, node):
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134 """method that returns a (sorted) list of names in a namespace that
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135 match a given node"""
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136 return sorted(self.nodemap(repo, node))