Mercurial > hg
annotate hgext/pager.py @ 23360:e06daad65f85
bookmark: read pending data when appropriate
If we are called by a hook and pending data exists, read it.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Sun, 28 Sep 2014 21:27:48 -0700 |
parents | bcddddcf0b54 |
children | afdf5f6ab37a |
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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 |
10263 | 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 -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 The --pager=... option can also be used to control when the pager is |
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53 used. Use a boolean value like yes, no, on, off, or use auto for |
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54 normal behavior. |
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55 |
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56 ''' |
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57 |
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58 import atexit, sys, os, signal, subprocess, errno, shlex |
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59 from mercurial import commands, dispatch, util, extensions, cmdutil |
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60 from mercurial.i18n import _ |
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61 |
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62 testedwith = 'internal' |
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63 |
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64 def _pagerfork(ui, p): |
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65 if not util.safehasattr(os, 'fork'): |
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66 sys.stdout = util.popen(p, 'wb') |
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67 if ui._isatty(sys.stderr): |
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68 sys.stderr = sys.stdout |
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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 if ui._isatty(sys.stderr): |
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76 os.dup2(fdout, sys.stderr.fileno()) |
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77 os.close(fdout) |
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78 return |
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79 os.dup2(fdin, sys.stdin.fileno()) |
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80 os.close(fdin) |
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81 os.close(fdout) |
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82 try: |
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83 os.execvp('/bin/sh', ['/bin/sh', '-c', p]) |
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84 except OSError, e: |
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85 if e.errno == errno.ENOENT: |
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86 # no /bin/sh, try executing the pager directly |
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87 args = shlex.split(p) |
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88 os.execvp(args[0], args) |
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89 else: |
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90 raise |
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91 |
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92 def _pagersubprocess(ui, p): |
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93 pager = subprocess.Popen(p, shell=True, bufsize=-1, |
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94 close_fds=util.closefds, stdin=subprocess.PIPE, |
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95 stdout=sys.stdout, stderr=sys.stderr) |
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96 |
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97 stdout = os.dup(sys.stdout.fileno()) |
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98 stderr = os.dup(sys.stderr.fileno()) |
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99 os.dup2(pager.stdin.fileno(), sys.stdout.fileno()) |
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100 if ui._isatty(sys.stderr): |
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101 os.dup2(pager.stdin.fileno(), sys.stderr.fileno()) |
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102 |
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103 @atexit.register |
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104 def killpager(): |
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105 if util.safehasattr(signal, "SIGINT"): |
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106 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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107 pager.stdin.close() |
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108 os.dup2(stdout, sys.stdout.fileno()) |
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109 os.dup2(stderr, sys.stderr.fileno()) |
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110 pager.wait() |
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111 |
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112 def _runpager(ui, p): |
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113 # The subprocess module shipped with Python <= 2.4 is buggy (issue3533). |
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114 # The compat version is buggy on Windows (issue3225), but has been shipping |
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115 # with hg for a long time. Preserve existing functionality. |
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116 if sys.version_info >= (2, 5): |
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117 _pagersubprocess(ui, p) |
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118 else: |
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119 _pagerfork(ui, p) |
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120 |
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121 def uisetup(ui): |
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122 if '--debugger' in sys.argv or not ui.formatted(): |
11414 | 123 return |
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 if usepager: |
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153 ui.setconfig('ui', 'formatted', ui.formatted(), 'pager') |
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154 ui.setconfig('ui', 'interactive', False, 'pager') |
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155 if util.safehasattr(signal, "SIGPIPE"): |
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156 signal.signal(signal.SIGPIPE, signal.SIG_DFL) |
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157 _runpager(ui, p) |
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158 return orig(ui, options, cmd, cmdfunc) |
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159 |
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160 extensions.wrapfunction(dispatch, '_runcommand', pagecmd) |
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161 |
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162 def extsetup(ui): |
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163 commands.globalopts.append( |
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164 ('', 'pager', 'auto', |
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165 _("when to paginate (boolean, always, auto, or never)"), |
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166 _('TYPE'))) |
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167 |
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168 attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff'] |