Mercurial > hg
annotate mercurial/help/templates.txt @ 29085:df838803c1d4
templater: add separate() template function
A pretty common pattern in templates is adding conditional separators
like so:
{node}{if(bookmarks, " {bookmarks}")}{if(tags, " {tags}")}
With this patch, the above can be simplified to:
{separate(" ", node, bookmarks, tags)}
The function is similar to the already existing join(), but with a few
differences:
* separate() skips empty arguments
* join() expects a single list argument, while separate() expects
each item as a separate argument
* separate() takes the separator first in order to allow a variable
number of arguments after it
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Tue, 03 May 2016 09:49:54 -0700 |
parents | d813132ea361 |
children | a12d13eac513 |
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1 Mercurial allows you to customize output of commands through |
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2 templates. You can either pass in a template or select an existing |
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3 template-style from the command line, via the --template option. |
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4 |
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5 You can customize output for any "log-like" command: log, |
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6 outgoing, incoming, tip, parents, and heads. |
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7 |
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8 Some built-in styles are packaged with Mercurial. These can be listed |
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9 with :hg:`log --template list`. Example usage:: |
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10 |
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11 $ hg log -r1.0::1.1 --template changelog |
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12 |
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13 A template is a piece of text, with markup to invoke variable |
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14 expansion:: |
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15 |
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16 $ hg log -r1 --template "{node}\n" |
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17 b56ce7b07c52de7d5fd79fb89701ea538af65746 |
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18 |
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19 Strings in curly braces are called keywords. The availability of |
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20 keywords depends on the exact context of the templater. These |
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21 keywords are usually available for templating a log-like command: |
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22 |
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23 .. keywordsmarker |
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24 |
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25 The "date" keyword does not produce human-readable output. If you |
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26 want to use a date in your output, you can use a filter to process |
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27 it. Filters are functions which return a string based on the input |
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28 variable. Be sure to use the stringify filter first when you're |
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29 applying a string-input filter to a list-like input variable. |
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30 You can also use a chain of filters to get the desired output:: |
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31 |
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32 $ hg tip --template "{date|isodate}\n" |
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33 2008-08-21 18:22 +0000 |
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34 |
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35 List of filters: |
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36 |
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37 .. filtersmarker |
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38 |
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39 Note that a filter is nothing more than a function call, i.e. |
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40 ``expr|filter`` is equivalent to ``filter(expr)``. |
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41 |
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42 In addition to filters, there are some basic built-in functions: |
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43 |
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44 .. functionsmarker |
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45 |
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46 Also, for any expression that returns a list, there is a list operator:: |
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47 |
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48 expr % "{template}" |
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49 |
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50 As seen in the above example, ``{template}`` is interpreted as a template. |
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51 To prevent it from being interpreted, you can use an escape character ``\{`` |
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52 or a raw string prefix, ``r'...'``. |
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53 |
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54 New keywords and functions can be defined in the ``templatealias`` section of |
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55 a Mercurial configuration file:: |
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56 |
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57 <alias> = <definition> |
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58 |
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59 Arguments of the form `a1`, `a2`, etc. are substituted from the alias into |
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60 the definition. |
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61 |
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62 For example, |
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63 |
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64 :: |
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65 |
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66 [templatealias] |
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67 r = rev |
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68 rn = "{r}:{node|short}" |
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69 leftpad(s, w) = pad(s, w, ' ', True) |
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70 |
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71 defines two symbol aliases, ``r`` and ``rn``, and a function alias |
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72 ``leftpad()``. |
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73 |
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74 Some sample command line templates: |
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75 |
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76 - Format lists, e.g. files:: |
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77 |
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78 $ hg log -r 0 --template "files:\n{files % ' {file}\n'}" |
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79 |
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80 - Join the list of files with a ", ":: |
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81 |
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82 $ hg log -r 0 --template "files: {join(files, ', ')}\n" |
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83 |
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84 - Separate non-empty arguments by a " ":: |
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85 |
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86 $ hg log -r 0 --template "{separate(' ', node, bookmarks, tags}\n" |
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87 |
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88 - Modify each line of a commit description:: |
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89 |
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90 $ hg log --template "{splitlines(desc) % '**** {line}\n'}" |
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91 |
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92 - Format date:: |
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93 |
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94 $ hg log -r 0 --template "{date(date, '%Y')}\n" |
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95 |
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96 - Display date in UTC:: |
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97 |
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98 $ hg log -r 0 --template "{localdate(date, 'UTC')|date}\n" |
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99 |
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100 - Output the description set to a fill-width of 30:: |
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101 |
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102 $ hg log -r 0 --template "{fill(desc, 30)}" |
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103 |
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104 - Use a conditional to test for the default branch:: |
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105 |
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106 $ hg log -r 0 --template "{ifeq(branch, 'default', 'on the main branch', |
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107 'on branch {branch}')}\n" |
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108 |
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109 - Append a newline if not empty:: |
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110 |
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111 $ hg tip --template "{if(author, '{author}\n')}" |
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112 |
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113 - Label the output for use with the color extension:: |
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114 |
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115 $ hg log -r 0 --template "{label('changeset.{phase}', node|short)}\n" |
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116 |
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117 - Invert the firstline filter, i.e. everything but the first line:: |
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118 |
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119 $ hg log -r 0 --template "{sub(r'^.*\n?\n?', '', desc)}\n" |
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120 |
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121 - Display the contents of the 'extra' field, one per line:: |
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122 |
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123 $ hg log -r 0 --template "{join(extras, '\n')}\n" |
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124 |
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125 - Mark the active bookmark with '*':: |
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126 |
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127 $ hg log --template "{bookmarks % '{bookmark}{ifeq(bookmark, active, '*')} '}\n" |
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128 |
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129 - Find the previous release candidate tag, the distance and changes since the tag:: |
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130 |
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131 $ hg log -r . --template "{latesttag('re:^.*-rc$') % '{tag}, {changes}, {distance}'}\n" |
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132 |
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133 - Mark the working copy parent with '@':: |
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134 |
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135 $ hg log --template "{ifcontains(rev, revset('.'), '@')}\n" |
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136 |
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137 - Show details of parent revisions:: |
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139 $ hg log --template "{revset('parents(%d)', rev) % '{desc|firstline}\n'}" |
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140 |
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141 - Show only commit descriptions that start with "template":: |
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142 |
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143 $ hg log --template "{startswith('template', firstline(desc))}\n" |
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144 |
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145 - Print the first word of each line of a commit message:: |
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147 $ hg log --template "{word(0, desc)}\n" |