annotate mercurial/templater.py @ 1909:37b9f80a5fbb

add doc comments to template code.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Mon, 27 Feb 2006 15:07:25 -0800
parents 9dec2479622d
children b288b4bb8448
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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
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 import re
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9 from demandload import demandload
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10 from i18n import gettext as _
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11 demandload(globals(), "cStringIO cgi os time urllib util")
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12
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13 esctable = {
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14 '\\': '\\',
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15 'r': '\r',
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16 't': '\t',
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17 'n': '\n',
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18 'v': '\v',
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19 }
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20
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21 def parsestring(s, quoted=True):
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22 '''parse a string using simple c-like syntax.
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23 string must be in quotes if quoted is True.'''
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24 fp = cStringIO.StringIO()
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25 if quoted:
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26 first = s[0]
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27 if len(s) < 2: raise SyntaxError(_('string too short'))
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28 if first not in "'\"": raise SyntaxError(_('invalid quote'))
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29 if s[-1] != first: raise SyntaxError(_('unmatched quotes'))
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30 s = s[1:-1]
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31 escape = False
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32 for c in s:
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33 if escape:
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34 fp.write(esctable.get(c, c))
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35 escape = False
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36 elif c == '\\': escape = True
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37 elif quoted and c == first: raise SyntaxError(_('string ends early'))
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38 else: fp.write(c)
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39 if escape: raise SyntaxError(_('unterminated escape'))
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40 return fp.getvalue()
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41
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42 class templater(object):
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43 '''template expansion engine.
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44
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45 template expansion works like this. a map file contains key=value
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46 pairs. if value is quoted, it is treated as string. otherwise, it
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47 is treated as name of template file.
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48
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49 templater is asked to expand a key in map. it looks up key, and
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50 looks for atrings like this: {foo}. it expands {foo} by looking up
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51 foo in map, and substituting it. expansion is recursive: it stops
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52 when there is no more {foo} to replace.
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53
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54 expansion also allows formatting and filtering.
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55
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56 format uses key to expand each item in list. syntax is
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57 {key%format}.
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58
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59 filter uses function to transform value. syntax is
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60 {key|filter1|filter2|...}.'''
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61
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62 def __init__(self, mapfile, filters={}, defaults={}):
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63 '''set up template engine.
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64 mapfile is name of file to read map definitions from.
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65 filters is dict of functions. each transforms a value into another.
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66 defaults is dict of default map definitions.'''
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67 self.mapfile = mapfile or 'template'
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68 self.cache = {}
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69 self.map = {}
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70 self.base = (mapfile and os.path.dirname(mapfile)) or ''
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71 self.filters = filters
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72 self.defaults = defaults
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73
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74 if not mapfile:
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75 return
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76 i = 0
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77 for l in file(mapfile):
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78 l = l.rstrip('\r\n')
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79 i += 1
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80 if l.startswith('#') or not l.strip(): continue
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81 m = re.match(r'([a-zA-Z_][a-zA-Z0-9_]*)\s*=\s*(.+)$', l)
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82 if m:
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83 key, val = m.groups()
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84 if val[0] in "'\"":
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85 try:
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86 self.cache[key] = parsestring(val)
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87 except SyntaxError, inst:
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88 raise SyntaxError('%s:%s: %s' %
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89 (mapfile, i, inst.args[0]))
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90 else:
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91 self.map[key] = os.path.join(self.base, val)
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92 else:
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93 raise SyntaxError(_("%s:%s: parse error") % (mapfile, i))
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94
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95 def __contains__(self, key):
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96 return key in self.cache
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97
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98 def __call__(self, t, **map):
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99 '''perform expansion.
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100 t is name of map element to expand.
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101 map is added elements to use during expansion.'''
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102 m = self.defaults.copy()
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103 m.update(map)
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104 try:
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105 tmpl = self.cache[t]
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106 except KeyError:
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107 try:
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108 tmpl = self.cache[t] = file(self.map[t]).read()
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109 except IOError, inst:
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110 raise IOError(inst.args[0], _('template file %s: %s') %
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111 (self.map[t], inst.args[1]))
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112 return self.template(tmpl, self.filters, **m)
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113
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114 template_re = re.compile(r"[#{]([a-zA-Z_][a-zA-Z0-9_]*)"
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115 r"((%[a-zA-Z_][a-zA-Z0-9_]*)*)"
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116 r"((\|[a-zA-Z_][a-zA-Z0-9_]*)*)[#}]")
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117
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118 def template(self, tmpl, filters={}, **map):
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119 lm = map.copy()
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120 while tmpl:
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121 m = self.template_re.search(tmpl)
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122 if m:
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123 start, end = m.span(0)
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124 s, e = tmpl[start], tmpl[end - 1]
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125 key = m.group(1)
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126 if ((s == '#' and e != '#') or (s == '{' and e != '}')):
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127 raise SyntaxError(_("'%s'/'%s' mismatch expanding '%s'") %
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128 (s, e, key))
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Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
129 if start:
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
130 yield tmpl[:start]
1905
0c760737b996 improve template errors when something is wrong.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1904
diff changeset
131 v = map.get(key, "")
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
132 v = callable(v) and v(**map) or v
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
133
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
134 format = m.group(2)
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
135 fl = m.group(4)
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
136
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
137 if format:
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
138 q = v.__iter__
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
139 for i in q():
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
140 lm.update(i)
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
141 yield self(format[1:], **lm)
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
142
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
143 v = ""
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
144
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
145 elif fl:
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
146 for f in fl.split("|")[1:]:
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
147 v = filters[f](v)
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
148
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
149 yield v
1905
0c760737b996 improve template errors when something is wrong.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1904
diff changeset
150 tmpl = tmpl[end:]
1896
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Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
151 else:
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
152 yield tmpl
1900
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
153 break
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
154
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
155 agescales = [("second", 1),
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
156 ("minute", 60),
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
157 ("hour", 3600),
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
158 ("day", 3600 * 24),
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
159 ("week", 3600 * 24 * 7),
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
160 ("month", 3600 * 24 * 30),
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
161 ("year", 3600 * 24 * 365)]
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
162
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
163 agescales.reverse()
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
164
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
165 def age(date):
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
166 '''turn a (timestamp, tzoff) tuple into an age string.'''
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
167
1896
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Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
168 def plural(t, c):
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
169 if c == 1:
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
170 return t
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
171 return t + "s"
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
172 def fmt(t, c):
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
173 return "%d %s" % (c, plural(t, c))
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
174
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
175 now = time.time()
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
176 then = date[0]
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
177 delta = max(1, int(now - then))
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
178
1900
f2815605186e move repeated work out of inner loops.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1899
diff changeset
179 for t, s in agescales:
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
180 n = delta / s
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
181 if n >= 2 or s == 1:
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
182 return fmt(t, n)
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
183
1906
9dec2479622d add iso date template filter.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1905
diff changeset
184 def isodate(date):
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
185 '''turn a (timestamp, tzoff) tuple into an iso 8631 date.'''
1906
9dec2479622d add iso date template filter.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1905
diff changeset
186 return util.datestr(date, format='%Y-%m-%d %H:%M')
9dec2479622d add iso date template filter.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1905
diff changeset
187
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
188 def nl2br(text):
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
189 '''replace raw newlines with xhtml line breaks.'''
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
190 return text.replace('\n', '<br/>\n')
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
191
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
192 def obfuscate(text):
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
193 return ''.join(['&#%d;' % ord(c) for c in text])
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
194
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
195 def domain(author):
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
196 '''get domain of author, or empty string if none.'''
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
197 f = author.find('@')
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
198 if f == -1: return ''
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
199 author = author[f+1:]
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
200 f = author.find('>')
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
201 if f >= 0: author = author[:f]
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
202 return author
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
203
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
204 def person(author):
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
205 '''get name of author, or else username.'''
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
206 f = author.find('<')
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
207 if f == -1: return util.shortuser(author)
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
208 return author[:f].rstrip()
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
209
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
210 common_filters = {
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
211 "addbreaks": nl2br,
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
212 "age": age,
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
213 "date": lambda x: util.datestr(x),
1905
0c760737b996 improve template errors when something is wrong.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1904
diff changeset
214 "domain": domain,
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
215 "escape": lambda x: cgi.escape(x, True),
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
216 "firstline": (lambda x: x.splitlines(1)[0]),
1906
9dec2479622d add iso date template filter.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1905
diff changeset
217 "isodate": isodate,
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
218 "obfuscate": obfuscate,
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
219 "permissions": (lambda x: x and "-rwxr-xr-x" or "-rw-r--r--"),
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
220 "person": person,
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
221 "rfc822date": lambda x: util.datestr(x, "%a, %d %b %Y %H:%M:%S"),
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
222 "short": (lambda x: x[:12]),
1904
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
223 "strip": lambda x: x.strip(),
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
224 "urlescape": urllib.quote,
a7e416bf3c1d improve templating.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1902
diff changeset
225 "user": util.shortuser,
1896
f8f818a04f5b move hgweb template code out to templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
diff changeset
226 }
1897
58b6784cf9f1 move hgweb.templatepath into templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1896
diff changeset
227
1899
888d298ddb91 many small changes to templater.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1897
diff changeset
228 def templatepath(name=None):
1909
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
229 '''return location of template file or directory (if no name).
37b9f80a5fbb add doc comments to template code.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1906
diff changeset
230 returns None if not found.'''
1899
888d298ddb91 many small changes to templater.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1897
diff changeset
231 for f in 'templates', '../templates':
888d298ddb91 many small changes to templater.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1897
diff changeset
232 fl = f.split('/')
888d298ddb91 many small changes to templater.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1897
diff changeset
233 if name: fl.append(name)
888d298ddb91 many small changes to templater.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1897
diff changeset
234 p = os.path.join(os.path.dirname(__file__), *fl)
888d298ddb91 many small changes to templater.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1897
diff changeset
235 if (name and os.path.exists(p)) or os.path.isdir(p):
1897
58b6784cf9f1 move hgweb.templatepath into templater
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1896
diff changeset
236 return os.path.normpath(p)