Mercurial > hg
annotate hgext/pager.py @ 27171:3028ea0aff46
histedit: mention histedit-last-edit.txt on abort
Users may spend a lot of effort writing histedit rules,
getting an abort without being told they can recover their work
is very frustrating.
Avoid that by telling them where to find their work.
author | timeless <timeless@mozdev.org> |
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date | Wed, 02 Dec 2015 08:07:36 +0000 |
parents | efceacd6a0c6 |
children | 63c2864af25f |
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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 |
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62 import atexit, sys, os, signal, subprocess |
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63 from mercurial import commands, dispatch, util, extensions, cmdutil |
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64 from mercurial.i18n import _ |
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65 |
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66 # Note for extension authors: ONLY specify testedwith = 'internal' for |
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67 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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68 # be specifying the version(s) of Mercurial they are tested with, or |
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69 # leave the attribute unspecified. |
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70 testedwith = 'internal' |
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71 |
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72 def _runpager(ui, p): |
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73 pager = subprocess.Popen(p, shell=True, bufsize=-1, |
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74 close_fds=util.closefds, stdin=subprocess.PIPE, |
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75 stdout=sys.stdout, stderr=sys.stderr) |
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76 |
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77 # back up original file objects and descriptors |
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78 olduifout = ui.fout |
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79 oldstdout = sys.stdout |
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80 stdoutfd = os.dup(sys.stdout.fileno()) |
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81 stderrfd = os.dup(sys.stderr.fileno()) |
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82 |
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83 # create new line-buffered stdout so that output can show up immediately |
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84 ui.fout = sys.stdout = newstdout = os.fdopen(sys.stdout.fileno(), 'wb', 1) |
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85 os.dup2(pager.stdin.fileno(), sys.stdout.fileno()) |
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86 if ui._isatty(sys.stderr): |
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87 os.dup2(pager.stdin.fileno(), sys.stderr.fileno()) |
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88 |
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89 @atexit.register |
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90 def killpager(): |
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91 if util.safehasattr(signal, "SIGINT"): |
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92 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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93 pager.stdin.close() |
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94 ui.fout = olduifout |
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95 sys.stdout = oldstdout |
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96 # close new stdout while it's associated with pager; otherwise stdout |
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97 # fd would be closed when newstdout is deleted |
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98 newstdout.close() |
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99 # restore original fds: stdout is open again |
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100 os.dup2(stdoutfd, sys.stdout.fileno()) |
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101 os.dup2(stderrfd, sys.stderr.fileno()) |
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102 pager.wait() |
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103 |
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104 def uisetup(ui): |
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105 if '--debugger' in sys.argv or not ui.formatted(): |
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107 | |
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108 def pagecmd(orig, ui, options, cmd, cmdfunc): |
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109 p = ui.config("pager", "pager", os.environ.get("PAGER")) |
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110 usepager = False |
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111 always = util.parsebool(options['pager']) |
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112 auto = options['pager'] == 'auto' |
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113 |
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114 if not p: |
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115 pass |
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116 elif always: |
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117 usepager = True |
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118 elif not auto: |
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119 usepager = False |
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120 else: |
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121 attend = ui.configlist('pager', 'attend', attended) |
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123 cmds, _ = cmdutil.findcmd(cmd, commands.table) |
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124 |
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125 for cmd in cmds: |
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126 var = 'attend-%s' % cmd |
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127 if ui.config('pager', var): |
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128 usepager = ui.configbool('pager', var) |
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129 break |
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130 if (cmd in attend or |
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131 (cmd not in ignore and not attend)): |
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132 usepager = True |
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133 break |
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134 |
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135 setattr(ui, 'pageractive', usepager) |
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136 |
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137 if usepager: |
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138 ui.setconfig('ui', 'formatted', ui.formatted(), 'pager') |
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139 ui.setconfig('ui', 'interactive', False, 'pager') |
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140 if util.safehasattr(signal, "SIGPIPE"): |
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141 signal.signal(signal.SIGPIPE, signal.SIG_DFL) |
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142 _runpager(ui, p) |
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143 return orig(ui, options, cmd, cmdfunc) |
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144 |
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145 # Wrap dispatch._runcommand after color is loaded so color can see |
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146 # ui.pageractive. Otherwise, if we loaded first, color's wrapped |
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147 # dispatch._runcommand would run without having access to ui.pageractive. |
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148 def afterloaded(loaded): |
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149 extensions.wrapfunction(dispatch, '_runcommand', pagecmd) |
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150 extensions.afterloaded('color', afterloaded) |
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151 |
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152 def extsetup(ui): |
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153 commands.globalopts.append( |
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154 ('', 'pager', 'auto', |
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155 _("when to paginate (boolean, always, auto, or never)"), |
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156 _('TYPE'))) |
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157 |
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158 attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff'] |