Mercurial > hg
annotate mercurial/templater.py @ 8366:0bf0045000b5
some modernization cleanups, forward compatibility
author | Dirkjan Ochtman <dirkjan@ochtman.nl> |
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date | Wed, 13 May 2009 14:08:39 +0200 |
parents | d8c5a7f25a40 |
children | bccc90b56d02 |
rev | line source |
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1909
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add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
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1 # templater.py - template expansion for output |
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2 # |
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2, incorporated herein by reference. |
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7 |
3891 | 8 from i18n import _ |
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9 import re, sys, os |
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10 import util, config, templatefilters |
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11 |
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12 path = ['templates', '../templates'] |
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13 stringify = templatefilters.stringify |
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14 |
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15 def parsestring(s, quoted=True): |
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16 '''parse a string using simple c-like syntax. |
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17 string must be in quotes if quoted is True.''' |
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18 if quoted: |
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19 if len(s) < 2 or s[0] != s[-1]: |
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20 raise SyntaxError(_('unmatched quotes')) |
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21 return s[1:-1].decode('string_escape') |
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22 |
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23 return s.decode('string_escape') |
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24 |
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25 class engine(object): |
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26 '''template expansion engine. |
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27 |
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28 template expansion works like this. a map file contains key=value |
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29 pairs. if value is quoted, it is treated as string. otherwise, it |
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30 is treated as name of template file. |
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31 |
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32 templater is asked to expand a key in map. it looks up key, and |
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33 looks for strings like this: {foo}. it expands {foo} by looking up |
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34 foo in map, and substituting it. expansion is recursive: it stops |
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35 when there is no more {foo} to replace. |
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36 |
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37 expansion also allows formatting and filtering. |
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38 |
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39 format uses key to expand each item in list. syntax is |
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40 {key%format}. |
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41 |
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42 filter uses function to transform value. syntax is |
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43 {key|filter1|filter2|...}.''' |
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44 |
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45 template_re = re.compile(r"(?:(?:#(?=[\w\|%]+#))|(?:{(?=[\w\|%]+})))" |
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46 r"(\w+)(?:(?:%(\w+))|((?:\|\w+)*))[#}]") |
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47 |
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48 def __init__(self, loader, filters={}, defaults={}): |
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49 self.loader = loader |
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50 self.filters = filters |
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51 self.defaults = defaults |
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52 |
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53 def process(self, t, map): |
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54 '''Perform expansion. t is name of map element to expand. map contains |
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55 added elements for use during expansion. Is a generator.''' |
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56 tmpl = self.loader(t) |
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57 iters = [self._process(tmpl, map)] |
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58 while iters: |
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59 try: |
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60 item = iters[0].next() |
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61 except StopIteration: |
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62 iters.pop(0) |
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63 continue |
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64 if isinstance(item, str): |
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65 yield item |
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66 elif item is None: |
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67 yield '' |
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68 elif hasattr(item, '__iter__'): |
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69 iters.insert(0, iter(item)) |
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70 else: |
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71 yield str(item) |
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72 |
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73 def _process(self, tmpl, map): |
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74 '''Render a template. Returns a generator.''' |
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75 while tmpl: |
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76 m = self.template_re.search(tmpl) |
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77 if not m: |
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78 yield tmpl |
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79 break |
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80 |
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81 start, end = m.span(0) |
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82 key, format, fl = m.groups() |
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83 |
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84 if start: |
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85 yield tmpl[:start] |
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86 tmpl = tmpl[end:] |
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87 |
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88 if key in map: |
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89 v = map[key] |
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90 else: |
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91 v = self.defaults.get(key, "") |
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92 if hasattr(v, '__call__'): |
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93 v = v(**map) |
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94 if format: |
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95 if not hasattr(v, '__iter__'): |
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96 raise SyntaxError(_("Error expanding '%s%%%s'") |
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97 % (key, format)) |
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98 lm = map.copy() |
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99 for i in v: |
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100 lm.update(i) |
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101 yield self.process(format, lm) |
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102 else: |
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103 if fl: |
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104 for f in fl.split("|")[1:]: |
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105 v = self.filters[f](v) |
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106 yield v |
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107 |
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108 engines = {'default': engine} |
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109 |
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110 class templater(object): |
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111 |
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112 def __init__(self, mapfile, filters={}, defaults={}, cache={}, |
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113 minchunk=1024, maxchunk=65536): |
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114 '''set up template engine. |
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115 mapfile is name of file to read map definitions from. |
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116 filters is dict of functions. each transforms a value into another. |
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117 defaults is dict of default map definitions.''' |
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118 self.mapfile = mapfile or 'template' |
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119 self.cache = cache.copy() |
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120 self.map = {} |
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121 self.base = (mapfile and os.path.dirname(mapfile)) or '' |
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122 self.filters = templatefilters.filters.copy() |
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123 self.filters.update(filters) |
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124 self.defaults = defaults |
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125 self.minchunk, self.maxchunk = minchunk, maxchunk |
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126 self.engines = {} |
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127 |
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128 if not mapfile: |
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129 return |
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130 if not os.path.exists(mapfile): |
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131 raise util.Abort(_('style not found: %s') % mapfile) |
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132 |
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133 conf = config.config() |
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134 conf.read(mapfile) |
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135 |
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136 for key, val in conf[''].items(): |
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137 if val[0] in "'\"": |
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138 try: |
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139 self.cache[key] = parsestring(val) |
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140 except SyntaxError, inst: |
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141 raise SyntaxError('%s: %s' % |
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142 (conf.source('', key), inst.args[0])) |
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143 else: |
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144 val = 'default', val |
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145 if ':' in val[1]: |
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146 val = val[1].split(':', 1) |
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147 self.map[key] = val[0], os.path.join(self.base, val[1]) |
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148 |
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149 def __contains__(self, key): |
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150 return key in self.cache or key in self.map |
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151 |
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152 def load(self, t): |
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153 '''Get the template for the given template name. Use a local cache.''' |
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154 if not t in self.cache: |
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155 try: |
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156 self.cache[t] = open(self.map[t][1]).read() |
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157 except IOError, inst: |
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158 raise IOError(inst.args[0], _('template file %s: %s') % |
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159 (self.map[t][1], inst.args[1])) |
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160 return self.cache[t] |
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161 |
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162 def __call__(self, t, **map): |
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163 ttype = t in self.map and self.map[t][0] or 'default' |
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164 proc = self.engines.get(ttype) |
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165 if proc is None: |
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166 proc = engines[ttype](self.load, self.filters, self.defaults) |
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167 self.engines[ttype] = proc |
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168 |
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169 stream = proc.process(t, map) |
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170 if self.minchunk: |
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171 stream = util.increasingchunks(stream, min=self.minchunk, |
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172 max=self.maxchunk) |
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173 return stream |
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174 |
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175 def templatepath(name=None): |
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176 '''return location of template file or directory (if no name). |
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177 returns None if not found.''' |
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178 normpaths = [] |
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|
179 |
2001
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|
180 # executable version (py2exe) doesn't support __file__ |
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181 if hasattr(sys, 'frozen'): |
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|
182 module = sys.executable |
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183 else: |
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184 module = __file__ |
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185 for f in path: |
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186 if f.startswith('/'): |
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187 p = f |
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188 else: |
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189 fl = f.split('/') |
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190 p = os.path.join(os.path.dirname(module), *fl) |
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191 if name: |
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192 p = os.path.join(p, name) |
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193 if name and os.path.exists(p): |
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194 return os.path.normpath(p) |
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195 elif os.path.isdir(p): |
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196 normpaths.append(os.path.normpath(p)) |
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197 |
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198 return normpaths |
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199 |
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200 def stylemap(style, paths=None): |
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201 """Return path to mapfile for a given style. |
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202 |
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203 Searches mapfile in the following locations: |
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204 1. templatepath/style/map |
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205 2. templatepath/map-style |
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206 3. templatepath/map |
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207 """ |
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208 |
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209 if paths is None: |
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210 paths = templatepath() |
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211 elif isinstance(paths, str): |
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212 paths = [paths] |
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213 |
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214 locations = style and [os.path.join(style, "map"), "map-" + style] or [] |
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215 locations.append("map") |
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216 for path in paths: |
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217 for location in locations: |
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218 mapfile = os.path.join(path, location) |
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219 if os.path.isfile(mapfile): |
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220 return mapfile |
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221 |
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222 raise RuntimeError("No hgweb templates found in %r" % paths) |