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annotate hgext/pager.py @ 12695:05077896ffe2

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pager: don't run pager if nothing is written to stdout/stderr This decides when to run the pager based on the first call to ui.write() and ui.write_err(). This has the side effect of not the output of subprocesses that write output before hg does.
author Brodie Rao <brodie@bitheap.org>
date Sun, 10 Oct 2010 12:21:49 -0500
parents 04f6de46bf3a
children a3b182dd548a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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6e1308a09ffd Use the pager given by the environment to display long output
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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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6 # GNU General Public License version 2 or any later version.
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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='FSRX' less
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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 By default, the pager is only executed if a command has output. To
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26 force the pager to run even if a command prints nothing, set::
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27
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28 [pager]
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29 force = True
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30
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31 If you notice "BROKEN PIPE" error messages, you can disable them by
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32 setting::
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33
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34 [pager]
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35 quiet = True
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36
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37 You can disable the pager for certain commands by adding them to the
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38 pager.ignore list::
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39
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40 [pager]
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41 ignore = version, help, update
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42
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43 You can also enable the pager only for certain commands using
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44 pager.attend. Below is the default list of commands to be paged::
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45
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46 [pager]
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47 attend = annotate, cat, diff, export, glog, log, qdiff
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48
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49 Setting pager.attend to an empty value will cause all commands to be
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50 paged.
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51
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52 If pager.attend is present, pager.ignore will be ignored.
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53
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54 To ignore global commands like :hg:`version` or :hg:`help`, you have
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55 to specify them in your user configuration file.
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56
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57 The --pager=... option can also be used to control when the pager is
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58 used. Use a boolean value like yes, no, on, off, or use auto for
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59 normal behavior.
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60 '''
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61
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62 import sys, os, signal, shlex, errno
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63 from mercurial import commands, dispatch, util, extensions
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64 from mercurial.i18n import _
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65
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66 def _runpager(p, sigpipe=False):
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67 if not hasattr(os, 'fork'):
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68 sys.stderr = sys.stdout = util.popen(p, 'wb')
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69 return
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70 fdin, fdout = os.pipe()
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71 pid = os.fork()
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72 if pid == 0:
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73 os.close(fdin)
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74 os.dup2(fdout, sys.stdout.fileno())
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75 os.dup2(fdout, sys.stderr.fileno())
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76 os.close(fdout)
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77 if sigpipe:
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78 signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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79 return
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80 os.dup2(fdin, sys.stdin.fileno())
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81 os.close(fdin)
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82 os.close(fdout)
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83 try:
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84 os.execvp('/bin/sh', ['/bin/sh', '-c', p])
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85 except OSError, e:
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86 if e.errno == errno.ENOENT:
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87 # no /bin/sh, try executing the pager directly
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88 args = shlex.split(p)
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89 os.execvp(args[0], args)
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90 else:
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91 raise
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92
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93 def uisetup(ui):
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94 if ui.plain():
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95 return
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96
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97 class pagerui(ui.__class__):
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98 _pager = None
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99 _pagerstarted = False
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100
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101 def write(self, *args, **opts):
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102 if self._pager and not self._pagerstarted:
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103 self._pagerstarted = True
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104 self._pager()
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105 return super(pagerui, self).write(*args, **opts)
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106
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107 def write_err(self, *args, **opts):
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108 if self._pager and not self._pagerstarted:
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109 self._pagerstarted = True
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110 self._pager()
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111 return super(pagerui, self).write(*args, **opts)
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112 ui.__class__ = pagerui
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113
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114 def pagecmd(orig, ui, options, cmd, cmdfunc):
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115 p = ui.config("pager", "pager", os.environ.get("PAGER"))
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116 if p and sys.stdout.isatty() and '--debugger' not in sys.argv:
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117 attend = ui.configlist('pager', 'attend', attended)
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118 auto = options['pager'] == 'auto'
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119 always = util.parsebool(options['pager'])
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120 if (always or auto and
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121 (cmd in attend or
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122 (cmd not in ui.configlist('pager', 'ignore') and not attend))):
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123 ui.setconfig('ui', 'formatted', ui.formatted())
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124 ui.setconfig('ui', 'interactive', False)
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125 sigpipe = ui.configbool('pager', 'quiet')
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126 if ui.configbool('pager', 'force'):
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127 _runpager(p, sigpipe)
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128 else:
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129 ui._pager = lambda: _runpager(p, sigpipe)
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130 return orig(ui, options, cmd, cmdfunc)
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131
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132 extensions.wrapfunction(dispatch, '_runcommand', pagecmd)
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133
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134 def extsetup(ui):
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135 commands.globalopts.append(
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136 ('', 'pager', 'auto',
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137 _("when to paginate (boolean, always, auto, or never)"),
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138 _('TYPE')))
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139
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140 attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff']