Mercurial > hg
annotate hgext/pager.py @ 28861:86db5cb55d46
pycompat: switch to util.stringio for py3 compat
author | timeless <timeless@mozdev.org> |
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date | Sun, 10 Apr 2016 20:55:37 +0000 |
parents | fa3438548b3d |
children | a0939666b836 |
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1 # pager.py - display output using a pager |
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2 # |
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3 # Copyright 2008 David Soria Parra <dsp@php.net> |
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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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7 # |
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8 # To load the extension, add it to your configuration file: |
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9 # |
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10 # [extension] |
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11 # pager = |
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12 # |
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13 # Run "hg help pager" to get info on configuration. |
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14 |
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15 '''browse command output with an external pager |
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16 |
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17 To set the pager that should be used, set the application variable:: |
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18 |
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19 [pager] |
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20 pager = less -FRX |
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21 |
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22 If no pager is set, the pager extensions uses the environment variable |
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23 $PAGER. If neither pager.pager, nor $PAGER is set, no pager is used. |
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24 |
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25 You can disable the pager for certain commands by adding them to the |
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26 pager.ignore list:: |
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27 |
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28 [pager] |
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29 ignore = version, help, update |
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30 |
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31 You can also enable the pager only for certain commands using |
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32 pager.attend. Below is the default list of commands to be paged:: |
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33 |
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34 [pager] |
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35 attend = annotate, cat, diff, export, glog, log, qdiff |
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36 |
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37 Setting pager.attend to an empty value will cause all commands to be |
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38 paged. |
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39 |
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40 If pager.attend is present, pager.ignore will be ignored. |
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41 |
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42 Lastly, you can enable and disable paging for individual commands with |
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43 the attend-<command> option. This setting takes precedence over |
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44 existing attend and ignore options and defaults:: |
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45 |
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46 [pager] |
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47 attend-cat = false |
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48 |
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49 To ignore global commands like :hg:`version` or :hg:`help`, you have |
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50 to specify them in your user configuration file. |
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51 |
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52 To control whether the pager is used at all for an individual command, |
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53 you can use --pager=<value>:: |
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54 |
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55 - use as needed: `auto`. |
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56 - require the pager: `yes` or `on`. |
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57 - suppress the pager: `no` or `off` (any unrecognized value |
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58 will also work). |
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59 |
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60 ''' |
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61 from __future__ import absolute_import |
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62 |
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63 import atexit |
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64 import os |
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65 import signal |
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66 import subprocess |
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67 import sys |
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68 |
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69 from mercurial import ( |
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70 cmdutil, |
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71 commands, |
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72 dispatch, |
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73 extensions, |
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74 util, |
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75 ) |
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76 from mercurial.i18n import _ |
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77 |
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78 # Note for extension authors: ONLY specify testedwith = 'internal' for |
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79 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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80 # be specifying the version(s) of Mercurial they are tested with, or |
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81 # leave the attribute unspecified. |
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82 testedwith = 'internal' |
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83 |
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84 def _runpager(ui, p): |
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85 pager = subprocess.Popen(p, shell=True, bufsize=-1, |
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86 close_fds=util.closefds, stdin=subprocess.PIPE, |
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87 stdout=sys.stdout, stderr=sys.stderr) |
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88 |
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89 # back up original file objects and descriptors |
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90 olduifout = ui.fout |
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91 oldstdout = sys.stdout |
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92 stdoutfd = os.dup(sys.stdout.fileno()) |
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93 stderrfd = os.dup(sys.stderr.fileno()) |
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94 |
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95 # create new line-buffered stdout so that output can show up immediately |
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96 ui.fout = sys.stdout = newstdout = os.fdopen(sys.stdout.fileno(), 'wb', 1) |
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97 os.dup2(pager.stdin.fileno(), sys.stdout.fileno()) |
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98 if ui._isatty(sys.stderr): |
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99 os.dup2(pager.stdin.fileno(), sys.stderr.fileno()) |
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100 |
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101 @atexit.register |
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102 def killpager(): |
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103 if util.safehasattr(signal, "SIGINT"): |
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104 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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105 pager.stdin.close() |
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106 ui.fout = olduifout |
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107 sys.stdout = oldstdout |
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108 # close new stdout while it's associated with pager; otherwise stdout |
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109 # fd would be closed when newstdout is deleted |
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110 newstdout.close() |
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111 # restore original fds: stdout is open again |
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112 os.dup2(stdoutfd, sys.stdout.fileno()) |
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113 os.dup2(stderrfd, sys.stderr.fileno()) |
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114 pager.wait() |
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115 |
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116 def uisetup(ui): |
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117 if '--debugger' in sys.argv or not ui.formatted(): |
11414 | 118 return |
119 | |
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120 # chg has its own pager implementation |
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121 argv = sys.argv[:] |
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122 if 'chgunix' in dispatch._earlygetopt(['--cmdserver'], argv): |
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123 return |
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124 |
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125 def pagecmd(orig, ui, options, cmd, cmdfunc): |
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126 p = ui.config("pager", "pager", os.environ.get("PAGER")) |
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127 usepager = False |
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128 always = util.parsebool(options['pager']) |
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129 auto = options['pager'] == 'auto' |
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130 |
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131 if not p: |
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132 pass |
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133 elif always: |
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134 usepager = True |
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135 elif not auto: |
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136 usepager = False |
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137 else: |
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138 attend = ui.configlist('pager', 'attend', attended) |
21280 | 139 ignore = ui.configlist('pager', 'ignore') |
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140 cmds, _ = cmdutil.findcmd(cmd, commands.table) |
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141 |
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142 for cmd in cmds: |
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143 var = 'attend-%s' % cmd |
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144 if ui.config('pager', var): |
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145 usepager = ui.configbool('pager', var) |
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146 break |
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147 if (cmd in attend or |
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148 (cmd not in ignore and not attend)): |
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149 usepager = True |
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150 break |
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151 |
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152 setattr(ui, 'pageractive', usepager) |
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153 |
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154 if usepager: |
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155 ui.setconfig('ui', 'formatted', ui.formatted(), 'pager') |
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156 ui.setconfig('ui', 'interactive', False, 'pager') |
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157 if util.safehasattr(signal, "SIGPIPE"): |
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158 signal.signal(signal.SIGPIPE, signal.SIG_DFL) |
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159 _runpager(ui, p) |
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160 return orig(ui, options, cmd, cmdfunc) |
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161 |
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162 # Wrap dispatch._runcommand after color is loaded so color can see |
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163 # ui.pageractive. Otherwise, if we loaded first, color's wrapped |
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164 # dispatch._runcommand would run without having access to ui.pageractive. |
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165 def afterloaded(loaded): |
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166 extensions.wrapfunction(dispatch, '_runcommand', pagecmd) |
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167 extensions.afterloaded('color', afterloaded) |
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168 |
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169 def extsetup(ui): |
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170 commands.globalopts.append( |
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171 ('', 'pager', 'auto', |
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172 _("when to paginate (boolean, always, auto, or never)"), |
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173 _('TYPE'))) |
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174 |
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175 attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff'] |