Mercurial > hg
annotate mercurial/formatter.py @ 37056:861e9d37e56e
wireproto: buffer output frames when in half duplex mode
Previously, when told that a response was ready, the server reactor
would instruct the caller to send frames immediately. This was OK
as an initial implementation. But it would not work for half-duplex
connections where the sender can't receive until all data has been
transmitted - such as httplib based clients.
In this commit, we teach the reactor that output frames should
be buffered until end of input is seen. This required a new
event to inform the reactor of end of input. The result from that
event will instruct the consumer to send all buffered frames.
The HTTP server is buffered by default.
This change effectively hides the complexity of buffering within
the reactor so that transports need not be concerned about it.
This helps keep the transports "dumb" and will make implementing
multiple requests-responses per atomic exchange (like an HTTP
request) much simpler.
Differential Revision: https://phab.mercurial-scm.org/D2860
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 14 Mar 2018 14:01:16 -0700 |
parents | de117f579431 |
children | 44757e6dad93 |
rev | line source |
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16134 | 1 # formatter.py - generic output formatting for mercurial |
2 # | |
3 # Copyright 2012 Matt Mackall <mpm@selenic.com> | |
4 # | |
5 # This software may be used and distributed according to the terms of the | |
6 # GNU General Public License version 2 or any later version. | |
7 | |
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8 """Generic output formatting for Mercurial |
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9 |
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10 The formatter provides API to show data in various ways. The following |
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11 functions should be used in place of ui.write(): |
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12 |
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13 - fm.write() for unconditional output |
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14 - fm.condwrite() to show some extra data conditionally in plain output |
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15 - fm.context() to provide changectx to template output |
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16 - fm.data() to provide extra data to JSON or template output |
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17 - fm.plain() to show raw text that isn't provided to JSON or template output |
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18 |
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19 To show structured data (e.g. date tuples, dicts, lists), apply fm.format*() |
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20 beforehand so the data is converted to the appropriate data type. Use |
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21 fm.isplain() if you need to convert or format data conditionally which isn't |
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22 supported by the formatter API. |
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23 |
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24 To build nested structure (i.e. a list of dicts), use fm.nested(). |
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25 |
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26 See also https://www.mercurial-scm.org/wiki/GenericTemplatingPlan |
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27 |
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28 fm.condwrite() vs 'if cond:': |
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29 |
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30 In most cases, use fm.condwrite() so users can selectively show the data |
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31 in template output. If it's costly to build data, use plain 'if cond:' with |
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32 fm.write(). |
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33 |
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34 fm.nested() vs fm.formatdict() (or fm.formatlist()): |
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35 |
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36 fm.nested() should be used to form a tree structure (a list of dicts of |
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37 lists of dicts...) which can be accessed through template keywords, e.g. |
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38 "{foo % "{bar % {...}} {baz % {...}}"}". On the other hand, fm.formatdict() |
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39 exports a dict-type object to template, which can be accessed by e.g. |
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40 "{get(foo, key)}" function. |
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41 |
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42 Doctest helper: |
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43 |
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44 >>> def show(fn, verbose=False, **opts): |
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45 ... import sys |
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46 ... from . import ui as uimod |
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47 ... ui = uimod.ui() |
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48 ... ui.verbose = verbose |
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49 ... ui.pushbuffer() |
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50 ... try: |
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51 ... return fn(ui, ui.formatter(pycompat.sysbytes(fn.__name__), |
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52 ... pycompat.byteskwargs(opts))) |
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53 ... finally: |
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54 ... print(pycompat.sysstr(ui.popbuffer()), end='') |
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55 |
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56 Basic example: |
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57 |
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58 >>> def files(ui, fm): |
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59 ... files = [(b'foo', 123, (0, 0)), (b'bar', 456, (1, 0))] |
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60 ... for f in files: |
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61 ... fm.startitem() |
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62 ... fm.write(b'path', b'%s', f[0]) |
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63 ... fm.condwrite(ui.verbose, b'date', b' %s', |
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64 ... fm.formatdate(f[2], b'%Y-%m-%d %H:%M:%S')) |
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65 ... fm.data(size=f[1]) |
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66 ... fm.plain(b'\\n') |
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67 ... fm.end() |
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68 >>> show(files) |
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69 foo |
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70 bar |
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71 >>> show(files, verbose=True) |
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72 foo 1970-01-01 00:00:00 |
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73 bar 1970-01-01 00:00:01 |
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74 >>> show(files, template=b'json') |
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75 [ |
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76 { |
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77 "date": [0, 0], |
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78 "path": "foo", |
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79 "size": 123 |
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80 }, |
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81 { |
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82 "date": [1, 0], |
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83 "path": "bar", |
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84 "size": 456 |
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85 } |
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86 ] |
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87 >>> show(files, template=b'path: {path}\\ndate: {date|rfc3339date}\\n') |
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88 path: foo |
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89 date: 1970-01-01T00:00:00+00:00 |
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90 path: bar |
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91 date: 1970-01-01T00:00:01+00:00 |
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92 |
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93 Nested example: |
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94 |
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95 >>> def subrepos(ui, fm): |
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96 ... fm.startitem() |
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97 ... fm.write(b'reponame', b'[%s]\\n', b'baz') |
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98 ... files(ui, fm.nested(b'files')) |
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99 ... fm.end() |
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100 >>> show(subrepos) |
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101 [baz] |
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102 foo |
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103 bar |
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104 >>> show(subrepos, template=b'{reponame}: {join(files % "{path}", ", ")}\\n') |
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105 baz: foo, bar |
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106 """ |
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107 |
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108 from __future__ import absolute_import, print_function |
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109 |
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110 import collections |
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111 import contextlib |
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112 import itertools |
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113 import os |
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114 |
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115 from .i18n import _ |
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116 from .node import ( |
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117 hex, |
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118 short, |
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119 ) |
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120 |
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121 from . import ( |
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122 error, |
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123 pycompat, |
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124 templatefilters, |
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125 templatekw, |
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126 templater, |
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127 templateutil, |
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128 util, |
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129 ) |
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130 from .utils import dateutil |
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131 |
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132 pickle = util.pickle |
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133 |
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134 class _nullconverter(object): |
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135 '''convert non-primitive data types to be processed by formatter''' |
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136 |
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137 # set to True if context object should be stored as item |
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138 storecontext = False |
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139 |
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140 @staticmethod |
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141 def formatdate(date, fmt): |
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142 '''convert date tuple to appropriate format''' |
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143 return date |
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144 @staticmethod |
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145 def formatdict(data, key, value, fmt, sep): |
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146 '''convert dict or key-value pairs to appropriate dict format''' |
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147 # use plain dict instead of util.sortdict so that data can be |
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148 # serialized as a builtin dict in pickle output |
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149 return dict(data) |
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150 @staticmethod |
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151 def formatlist(data, name, fmt, sep): |
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152 '''convert iterable to appropriate list format''' |
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153 return list(data) |
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154 |
16134 | 155 class baseformatter(object): |
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156 def __init__(self, ui, topic, opts, converter): |
16134 | 157 self._ui = ui |
158 self._topic = topic | |
159 self._style = opts.get("style") | |
160 self._template = opts.get("template") | |
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161 self._converter = converter |
16134 | 162 self._item = None |
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163 # function to convert node to string suitable for this output |
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164 self.hexfunc = hex |
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165 def __enter__(self): |
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166 return self |
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167 def __exit__(self, exctype, excvalue, traceback): |
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168 if exctype is None: |
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169 self.end() |
16134 | 170 def _showitem(self): |
171 '''show a formatted item once all data is collected''' | |
172 def startitem(self): | |
173 '''begin an item in the format list''' | |
174 if self._item is not None: | |
175 self._showitem() | |
176 self._item = {} | |
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177 def formatdate(self, date, fmt='%a %b %d %H:%M:%S %Y %1%2'): |
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178 '''convert date tuple to appropriate format''' |
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179 return self._converter.formatdate(date, fmt) |
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180 def formatdict(self, data, key='key', value='value', fmt=None, sep=' '): |
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181 '''convert dict or key-value pairs to appropriate dict format''' |
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182 return self._converter.formatdict(data, key, value, fmt, sep) |
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183 def formatlist(self, data, name, fmt=None, sep=' '): |
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184 '''convert iterable to appropriate list format''' |
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185 # name is mandatory argument for now, but it could be optional if |
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186 # we have default template keyword, e.g. {item} |
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187 return self._converter.formatlist(data, name, fmt, sep) |
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188 def context(self, **ctxs): |
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189 '''insert context objects to be used to render template keywords''' |
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190 ctxs = pycompat.byteskwargs(ctxs) |
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191 assert all(k in {'ctx', 'fctx'} for k in ctxs) |
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192 if self._converter.storecontext: |
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193 self._item.update(ctxs) |
16134 | 194 def data(self, **data): |
195 '''insert data into item that's not shown in default output''' | |
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196 data = pycompat.byteskwargs(data) |
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197 self._item.update(data) |
16134 | 198 def write(self, fields, deftext, *fielddata, **opts): |
199 '''do default text output while assigning data to item''' | |
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200 fieldkeys = fields.split() |
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201 assert len(fieldkeys) == len(fielddata) |
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202 self._item.update(zip(fieldkeys, fielddata)) |
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203 def condwrite(self, cond, fields, deftext, *fielddata, **opts): |
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204 '''do conditional write (primarily for plain formatter)''' |
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205 fieldkeys = fields.split() |
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206 assert len(fieldkeys) == len(fielddata) |
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207 self._item.update(zip(fieldkeys, fielddata)) |
16134 | 208 def plain(self, text, **opts): |
209 '''show raw text for non-templated mode''' | |
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210 def isplain(self): |
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211 '''check for plain formatter usage''' |
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212 return False |
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213 def nested(self, field): |
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214 '''sub formatter to store nested data in the specified field''' |
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215 self._item[field] = data = [] |
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216 return _nestedformatter(self._ui, self._converter, data) |
16134 | 217 def end(self): |
218 '''end output for the formatter''' | |
219 if self._item is not None: | |
220 self._showitem() | |
221 | |
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222 def nullformatter(ui, topic): |
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223 '''formatter that prints nothing''' |
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224 return baseformatter(ui, topic, opts={}, converter=_nullconverter) |
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225 |
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226 class _nestedformatter(baseformatter): |
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227 '''build sub items and store them in the parent formatter''' |
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228 def __init__(self, ui, converter, data): |
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229 baseformatter.__init__(self, ui, topic='', opts={}, converter=converter) |
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230 self._data = data |
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231 def _showitem(self): |
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232 self._data.append(self._item) |
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233 |
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234 def _iteritems(data): |
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235 '''iterate key-value pairs in stable order''' |
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236 if isinstance(data, dict): |
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237 return sorted(data.iteritems()) |
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238 return data |
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239 |
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240 class _plainconverter(object): |
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241 '''convert non-primitive data types to text''' |
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242 |
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243 storecontext = False |
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244 |
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245 @staticmethod |
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246 def formatdate(date, fmt): |
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247 '''stringify date tuple in the given format''' |
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248 return dateutil.datestr(date, fmt) |
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249 @staticmethod |
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250 def formatdict(data, key, value, fmt, sep): |
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251 '''stringify key-value pairs separated by sep''' |
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252 prefmt = pycompat.identity |
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253 if fmt is None: |
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254 fmt = '%s=%s' |
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255 prefmt = pycompat.bytestr |
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256 return sep.join(fmt % (prefmt(k), prefmt(v)) |
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257 for k, v in _iteritems(data)) |
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258 @staticmethod |
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259 def formatlist(data, name, fmt, sep): |
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260 '''stringify iterable separated by sep''' |
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261 prefmt = pycompat.identity |
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262 if fmt is None: |
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263 fmt = '%s' |
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264 prefmt = pycompat.bytestr |
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265 return sep.join(fmt % prefmt(e) for e in data) |
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266 |
16134 | 267 class plainformatter(baseformatter): |
268 '''the default text output scheme''' | |
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269 def __init__(self, ui, out, topic, opts): |
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270 baseformatter.__init__(self, ui, topic, opts, _plainconverter) |
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271 if ui.debugflag: |
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272 self.hexfunc = hex |
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273 else: |
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274 self.hexfunc = short |
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275 if ui is out: |
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276 self._write = ui.write |
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277 else: |
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278 self._write = lambda s, **opts: out.write(s) |
16134 | 279 def startitem(self): |
280 pass | |
281 def data(self, **data): | |
282 pass | |
283 def write(self, fields, deftext, *fielddata, **opts): | |
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284 self._write(deftext % fielddata, **opts) |
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285 def condwrite(self, cond, fields, deftext, *fielddata, **opts): |
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286 '''do conditional write''' |
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287 if cond: |
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288 self._write(deftext % fielddata, **opts) |
16134 | 289 def plain(self, text, **opts): |
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290 self._write(text, **opts) |
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291 def isplain(self): |
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292 return True |
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293 def nested(self, field): |
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294 # nested data will be directly written to ui |
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295 return self |
16134 | 296 def end(self): |
297 pass | |
298 | |
299 class debugformatter(baseformatter): | |
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300 def __init__(self, ui, out, topic, opts): |
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301 baseformatter.__init__(self, ui, topic, opts, _nullconverter) |
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302 self._out = out |
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303 self._out.write("%s = [\n" % self._topic) |
16134 | 304 def _showitem(self): |
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305 self._out.write(' %s,\n' % pycompat.byterepr(self._item)) |
16134 | 306 def end(self): |
307 baseformatter.end(self) | |
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308 self._out.write("]\n") |
16134 | 309 |
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310 class pickleformatter(baseformatter): |
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311 def __init__(self, ui, out, topic, opts): |
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312 baseformatter.__init__(self, ui, topic, opts, _nullconverter) |
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313 self._out = out |
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314 self._data = [] |
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315 def _showitem(self): |
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316 self._data.append(self._item) |
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317 def end(self): |
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318 baseformatter.end(self) |
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319 self._out.write(pickle.dumps(self._data)) |
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320 |
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321 class jsonformatter(baseformatter): |
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322 def __init__(self, ui, out, topic, opts): |
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323 baseformatter.__init__(self, ui, topic, opts, _nullconverter) |
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324 self._out = out |
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325 self._out.write("[") |
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326 self._first = True |
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327 def _showitem(self): |
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328 if self._first: |
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329 self._first = False |
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330 else: |
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331 self._out.write(",") |
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332 |
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333 self._out.write("\n {\n") |
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334 first = True |
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335 for k, v in sorted(self._item.items()): |
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336 if first: |
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337 first = False |
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338 else: |
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339 self._out.write(",\n") |
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340 u = templatefilters.json(v, paranoid=False) |
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341 self._out.write(' "%s": %s' % (k, u)) |
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342 self._out.write("\n }") |
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343 def end(self): |
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344 baseformatter.end(self) |
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345 self._out.write("\n]\n") |
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346 |
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347 class _templateconverter(object): |
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348 '''convert non-primitive data types to be processed by templater''' |
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349 |
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350 storecontext = True |
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351 |
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352 @staticmethod |
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353 def formatdate(date, fmt): |
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354 '''return date tuple''' |
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355 return date |
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356 @staticmethod |
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357 def formatdict(data, key, value, fmt, sep): |
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358 '''build object that can be evaluated as either plain string or dict''' |
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359 data = util.sortdict(_iteritems(data)) |
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360 def f(): |
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361 yield _plainconverter.formatdict(data, key, value, fmt, sep) |
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362 return templateutil.hybriddict(data, key=key, value=value, fmt=fmt, |
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363 gen=f) |
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364 @staticmethod |
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365 def formatlist(data, name, fmt, sep): |
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366 '''build object that can be evaluated as either plain string or list''' |
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367 data = list(data) |
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368 def f(): |
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369 yield _plainconverter.formatlist(data, name, fmt, sep) |
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370 return templateutil.hybridlist(data, name=name, fmt=fmt, gen=f) |
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371 |
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372 class templateformatter(baseformatter): |
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373 def __init__(self, ui, out, topic, opts): |
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374 baseformatter.__init__(self, ui, topic, opts, _templateconverter) |
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375 self._out = out |
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376 spec = lookuptemplate(ui, topic, opts.get('template', '')) |
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377 self._tref = spec.ref |
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378 self._t = loadtemplater(ui, spec, defaults=templatekw.keywords, |
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379 resources=templateresources(ui), |
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380 cache=templatekw.defaulttempl) |
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381 self._parts = templatepartsmap(spec, self._t, |
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382 ['docheader', 'docfooter', 'separator']) |
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383 self._counter = itertools.count() |
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384 self._renderitem('docheader', {}) |
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385 |
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386 def _showitem(self): |
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387 item = self._item.copy() |
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388 item['index'] = index = next(self._counter) |
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389 if index > 0: |
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390 self._renderitem('separator', {}) |
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391 self._renderitem(self._tref, item) |
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392 |
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393 def _renderitem(self, part, item): |
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394 if part not in self._parts: |
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395 return |
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396 ref = self._parts[part] |
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397 |
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398 props = {} |
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399 # explicitly-defined fields precede templatekw |
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400 props.update(item) |
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401 if 'ctx' in item or 'fctx' in item: |
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402 # but template resources must be always available |
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403 props['revcache'] = {} |
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404 self._out.write(self._t.render(ref, props)) |
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405 |
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406 def end(self): |
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407 baseformatter.end(self) |
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408 self._renderitem('docfooter', {}) |
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409 |
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410 templatespec = collections.namedtuple(r'templatespec', |
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411 r'ref tmpl mapfile') |
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412 |
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413 def lookuptemplate(ui, topic, tmpl): |
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414 """Find the template matching the given -T/--template spec 'tmpl' |
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415 |
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416 'tmpl' can be any of the following: |
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417 |
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418 - a literal template (e.g. '{rev}') |
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419 - a map-file name or path (e.g. 'changelog') |
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420 - a reference to [templates] in config file |
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421 - a path to raw template file |
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422 |
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423 A map file defines a stand-alone template environment. If a map file |
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424 selected, all templates defined in the file will be loaded, and the |
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425 template matching the given topic will be rendered. Aliases won't be |
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426 loaded from user config, but from the map file. |
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427 |
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428 If no map file selected, all templates in [templates] section will be |
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429 available as well as aliases in [templatealias]. |
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430 """ |
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431 |
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432 # looks like a literal template? |
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433 if '{' in tmpl: |
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434 return templatespec('', tmpl, None) |
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435 |
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436 # perhaps a stock style? |
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437 if not os.path.split(tmpl)[0]: |
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438 mapname = (templater.templatepath('map-cmdline.' + tmpl) |
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439 or templater.templatepath(tmpl)) |
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440 if mapname and os.path.isfile(mapname): |
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441 return templatespec(topic, None, mapname) |
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442 |
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443 # perhaps it's a reference to [templates] |
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444 if ui.config('templates', tmpl): |
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445 return templatespec(tmpl, None, None) |
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446 |
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447 if tmpl == 'list': |
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448 ui.write(_("available styles: %s\n") % templater.stylelist()) |
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449 raise error.Abort(_("specify a template")) |
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450 |
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451 # perhaps it's a path to a map or a template |
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452 if ('/' in tmpl or '\\' in tmpl) and os.path.isfile(tmpl): |
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453 # is it a mapfile for a style? |
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454 if os.path.basename(tmpl).startswith("map-"): |
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455 return templatespec(topic, None, os.path.realpath(tmpl)) |
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456 with util.posixfile(tmpl, 'rb') as f: |
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457 tmpl = f.read() |
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458 return templatespec('', tmpl, None) |
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459 |
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460 # constant string? |
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461 return templatespec('', tmpl, None) |
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462 |
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463 def templatepartsmap(spec, t, partnames): |
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464 """Create a mapping of {part: ref}""" |
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465 partsmap = {spec.ref: spec.ref} # initial ref must exist in t |
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466 if spec.mapfile: |
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467 partsmap.update((p, p) for p in partnames if p in t) |
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468 elif spec.ref: |
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469 for part in partnames: |
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470 ref = '%s:%s' % (spec.ref, part) # select config sub-section |
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471 if ref in t: |
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472 partsmap[part] = ref |
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473 return partsmap |
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|
474 |
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475 def loadtemplater(ui, spec, defaults=None, resources=None, cache=None): |
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476 """Create a templater from either a literal template or loading from |
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477 a map file""" |
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478 assert not (spec.tmpl and spec.mapfile) |
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479 if spec.mapfile: |
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480 frommapfile = templater.templater.frommapfile |
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481 return frommapfile(spec.mapfile, defaults=defaults, resources=resources, |
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482 cache=cache) |
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483 return maketemplater(ui, spec.tmpl, defaults=defaults, resources=resources, |
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484 cache=cache) |
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485 |
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486 def maketemplater(ui, tmpl, defaults=None, resources=None, cache=None): |
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487 """Create a templater from a string template 'tmpl'""" |
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488 aliases = ui.configitems('templatealias') |
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489 t = templater.templater(defaults=defaults, resources=resources, |
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490 cache=cache, aliases=aliases) |
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491 t.cache.update((k, templater.unquotestring(v)) |
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492 for k, v in ui.configitems('templates')) |
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493 if tmpl: |
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|
494 t.cache[''] = tmpl |
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495 return t |
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496 |
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497 def templateresources(ui, repo=None): |
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498 """Create a dict of template resources designed for the default templatekw |
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499 and function""" |
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500 resmap = { |
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501 'cache': {}, # for templatekw/funcs to store reusable data |
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502 'repo': repo, |
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503 'ui': ui, |
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504 } |
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505 |
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506 def getsome(context, mapping, key): |
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507 v = mapping.get(key) |
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508 if v is not None: |
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509 return v |
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510 return resmap.get(key) |
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511 |
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512 def getctx(context, mapping, key): |
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513 ctx = mapping.get('ctx') |
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514 if ctx is not None: |
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515 return ctx |
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516 fctx = mapping.get('fctx') |
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517 if fctx is not None: |
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518 return fctx.changectx() |
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519 |
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520 def getrepo(context, mapping, key): |
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521 ctx = getctx(context, mapping, 'ctx') |
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522 if ctx is not None: |
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523 return ctx.repo() |
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524 return getsome(context, mapping, key) |
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525 |
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526 return { |
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527 'cache': getsome, |
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528 'ctx': getctx, |
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529 'fctx': getsome, |
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530 'repo': getrepo, |
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531 'revcache': getsome, # per-ctx cache; set later |
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532 'ui': getsome, |
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533 } |
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534 |
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535 def formatter(ui, out, topic, opts): |
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536 template = opts.get("template", "") |
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537 if template == "json": |
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538 return jsonformatter(ui, out, topic, opts) |
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539 elif template == "pickle": |
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540 return pickleformatter(ui, out, topic, opts) |
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541 elif template == "debug": |
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542 return debugformatter(ui, out, topic, opts) |
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543 elif template != "": |
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544 return templateformatter(ui, out, topic, opts) |
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545 # developer config: ui.formatdebug |
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546 elif ui.configbool('ui', 'formatdebug'): |
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547 return debugformatter(ui, out, topic, opts) |
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548 # deprecated config: ui.formatjson |
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549 elif ui.configbool('ui', 'formatjson'): |
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550 return jsonformatter(ui, out, topic, opts) |
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551 return plainformatter(ui, out, topic, opts) |
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552 |
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553 @contextlib.contextmanager |
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554 def openformatter(ui, filename, topic, opts): |
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555 """Create a formatter that writes outputs to the specified file |
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556 |
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557 Must be invoked using the 'with' statement. |
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558 """ |
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559 with util.posixfile(filename, 'wb') as out: |
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560 with formatter(ui, out, topic, opts) as fm: |
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561 yield fm |
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562 |
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563 @contextlib.contextmanager |
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564 def _neverending(fm): |
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565 yield fm |
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566 |
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567 def maybereopen(fm, filename, opts): |
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568 """Create a formatter backed by file if filename specified, else return |
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569 the given formatter |
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570 |
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571 Must be invoked using the 'with' statement. This will never call fm.end() |
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572 of the given formatter. |
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573 """ |
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574 if filename: |
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575 return openformatter(fm._ui, filename, fm._topic, opts) |
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576 else: |
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577 return _neverending(fm) |