git-interpret-trailers.html

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 735 <body class="manpage">
 736 <div id="header">
 737 <h1>
 738 git-interpret-trailers(1) Manual Page
 739 </h1>
 740 <h2>NAME</h2>
 741 <div class="sectionbody">
 742 <p>git-interpret-trailers -
 743    Add or parse structured information in commit messages
 744 </p>
 745 </div>
 746 </div>
 747 <div id="content">
 748 <div class="sect1">
 749 <h2 id="_synopsis">SYNOPSIS</h2>
 750 <div class="sectionbody">
 751 <div class="verseblock">
 752 <pre class="content"><em>git interpret-trailers</em> [--in-place] [--trim-empty]
 753                         [(--trailer (&lt;key&gt;|&lt;keyAlias&gt;)[(=|:)&lt;value&gt;])&#8230;]
 754                         [--parse] [&lt;file&gt;&#8230;]</pre>
 755 <div class="attribution">
 756 </div></div>
 757 </div>
 758 </div>
 759 <div class="sect1">
 760 <h2 id="_description">DESCRIPTION</h2>
 761 <div class="sectionbody">
 762 <div class="paragraph"><p>Add or parse <em>trailer</em> lines that look similar to RFC 822 e-mail
 763 headers, at the end of the otherwise free-form part of a commit
 764 message. For example, in the following commit message</p></div>
 765 <div class="listingblock">
 766 <div class="content">
 767 <pre><code>subject
 768
 769 Lorem ipsum dolor sit amet, consectetur adipiscing elit.
 770
 771 Signed-off-by: Alice &lt;alice@example.com&gt;
 772 Signed-off-by: Bob &lt;bob@example.com&gt;</code></pre>
 773 </div></div>
 774 <div class="paragraph"><p>the last two lines starting with "Signed-off-by" are trailers.</p></div>
 775 <div class="paragraph"><p>This command reads commit messages from either the
 776 &lt;file&gt; arguments or the standard input if no &lt;file&gt; is specified.
 777 If <code>--parse</code> is specified, the output consists of the parsed trailers
 778 coming from the input, without influencing them with any command line
 779 options or configuration variables.</p></div>
 780 <div class="paragraph"><p>Otherwise, this command applies <code>trailer.*</code> configuration variables
 781 (which could potentially add new trailers, as well as reposition them),
 782 as well as any command line arguments that can override configuration
 783 variables (such as <code>--trailer=...</code> which could also add new trailers),
 784 to each input file. The result is emitted on the standard output.</p></div>
 785 <div class="paragraph"><p>This command can also operate on the output of <a href="git-format-patch.html">git-format-patch(1)</a>,
 786 which is more elaborate than a plain commit message. Namely, such output
 787 includes a commit message (as above), a "---" divider line, and a patch part.
 788 For these inputs, the divider and patch parts are not modified by
 789 this command and are emitted as is on the output, unless
 790 <code>--no-divider</code> is specified.</p></div>
 791 <div class="paragraph"><p>Some configuration variables control the way the <code>--trailer</code> arguments
 792 are applied to each input and the way any existing trailer in
 793 the input is changed. They also make it possible to
 794 automatically add some trailers.</p></div>
 795 <div class="paragraph"><p>By default, a <em>&lt;key&gt;=&lt;value&gt;</em> or <em>&lt;key&gt;:&lt;value&gt;</em> argument given
 796 using <code>--trailer</code> will be appended after the existing trailers only if
 797 the last trailer has a different (&lt;key&gt;, &lt;value&gt;) pair (or if there
 798 is no existing trailer). The &lt;key&gt; and &lt;value&gt; parts will be trimmed
 799 to remove starting and trailing whitespace, and the resulting trimmed
 800 &lt;key&gt; and &lt;value&gt; will appear in the output like this:</p></div>
 801 <div class="listingblock">
 802 <div class="content">
 803 <pre><code>key: value</code></pre>
 804 </div></div>
 805 <div class="paragraph"><p>This means that the trimmed &lt;key&gt; and &lt;value&gt; will be separated by
 806 <code>': '</code> (one colon followed by one space).</p></div>
 807 <div class="paragraph"><p>For convenience, a &lt;keyAlias&gt; can be configured to make using <code>--trailer</code>
 808 shorter to type on the command line. This can be configured using the
 809 <em>trailer.&lt;keyAlias&gt;.key</em> configuration variable. The &lt;keyAlias&gt; must be a prefix
 810 of the full &lt;key&gt; string, although case sensitivity does not matter. For
 811 example, if you have</p></div>
 812 <div class="listingblock">
 813 <div class="content">
 814 <pre><code>trailer.sign.key "Signed-off-by: "</code></pre>
 815 </div></div>
 816 <div class="paragraph"><p>in your configuration, you only need to specify <code>--trailer="sign: foo"</code>
 817 on the command line instead of <code>--trailer="Signed-off-by: foo"</code>.</p></div>
 818 <div class="paragraph"><p>By default the new trailer will appear at the end of all the existing
 819 trailers. If there is no existing trailer, the new trailer will appear
 820 at the end of the input. A blank line will be added before the new
 821 trailer if there isn&#8217;t one already.</p></div>
 822 <div class="paragraph"><p>Existing trailers are extracted from the input by looking for
 823 a group of one or more lines that (i) is all trailers, or (ii) contains at
 824 least one Git-generated or user-configured trailer and consists of at
 825 least 25% trailers.
 826 The group must be preceded by one or more empty (or whitespace-only) lines.
 827 The group must either be at the end of the input or be the last
 828 non-whitespace lines before a line that starts with <em>---</em> (followed by a
 829 space or the end of the line).</p></div>
 830 <div class="paragraph"><p>When reading trailers, there can be no whitespace before or inside the
 831 &lt;key&gt;, but any number of regular space and tab characters are allowed
 832 between the &lt;key&gt; and the separator. There can be whitespaces before,
 833 inside or after the &lt;value&gt;. The &lt;value&gt; may be split over multiple lines
 834 with each subsequent line starting with at least one whitespace, like
 835 the "folding" in RFC 822. Example:</p></div>
 836 <div class="listingblock">
 837 <div class="content">
 838 <pre><code>key: This is a very long value, with spaces and
 839   newlines in it.</code></pre>
 840 </div></div>
 841 <div class="paragraph"><p>Note that trailers do not follow (nor are they intended to follow) many of the
 842 rules for RFC 822 headers. For example they do not follow the encoding rule.</p></div>
 843 </div>
 844 </div>
 845 <div class="sect1">
 846 <h2 id="_options">OPTIONS</h2>
 847 <div class="sectionbody">
 848 <div class="dlist"><dl>
 849 <dt class="hdlist1">
 850 --in-place
 851 </dt>
 852 <dd>
 853 <p>
 854         Edit the files in place.
 855 </p>
 856 </dd>
 857 <dt class="hdlist1">
 858 --trim-empty
 859 </dt>
 860 <dd>
 861 <p>
 862         If the &lt;value&gt; part of any trailer contains only whitespace,
 863         the whole trailer will be removed from the output.
 864         This applies to existing trailers as well as new trailers.
 865 </p>
 866 </dd>
 867 <dt class="hdlist1">
 868 --trailer &lt;key&gt;[(=|:)&lt;value&gt;]
 869 </dt>
 870 <dd>
 871 <p>
 872         Specify a (&lt;key&gt;, &lt;value&gt;) pair that should be applied as a
 873         trailer to the inputs. See the description of this
 874         command.
 875 </p>
 876 </dd>
 877 <dt class="hdlist1">
 878 --where &lt;placement&gt;
 879 </dt>
 880 <dt class="hdlist1">
 881 --no-where
 882 </dt>
 883 <dd>
 884 <p>
 885         Specify where all new trailers will be added.  A setting
 886         provided with <em>--where</em> overrides the <code>trailer.where</code> and any
 887         applicable <code>trailer.&lt;keyAlias&gt;.where</code> configuration variables
 888         and applies to all <em>--trailer</em> options until the next occurrence of
 889         <em>--where</em> or <em>--no-where</em>. Upon encountering <em>--no-where</em>, clear the
 890         effect of any previous use of <em>--where</em>, such that the relevant configuration
 891         variables are no longer overridden. Possible placements are <code>after</code>,
 892         <code>before</code>, <code>end</code> or <code>start</code>.
 893 </p>
 894 </dd>
 895 <dt class="hdlist1">
 896 --if-exists &lt;action&gt;
 897 </dt>
 898 <dt class="hdlist1">
 899 --no-if-exists
 900 </dt>
 901 <dd>
 902 <p>
 903         Specify what action will be performed when there is already at
 904         least one trailer with the same &lt;key&gt; in the input.  A setting
 905         provided with <em>--if-exists</em> overrides the <code>trailer.ifExists</code> and any
 906         applicable <code>trailer.&lt;keyAlias&gt;.ifExists</code> configuration variables
 907         and applies to all <em>--trailer</em> options until the next occurrence of
 908         <em>--if-exists</em> or <em>--no-if-exists</em>. Upon encountering '--no-if-exists, clear the
 909         effect of any previous use of '--if-exists, such that the relevant configuration
 910         variables are no longer overridden. Possible actions are <code>addIfDifferent</code>,
 911         <code>addIfDifferentNeighbor</code>, <code>add</code>, <code>replace</code> and <code>doNothing</code>.
 912 </p>
 913 </dd>
 914 <dt class="hdlist1">
 915 --if-missing &lt;action&gt;
 916 </dt>
 917 <dt class="hdlist1">
 918 --no-if-missing
 919 </dt>
 920 <dd>
 921 <p>
 922         Specify what action will be performed when there is no other
 923         trailer with the same &lt;key&gt; in the input.  A setting
 924         provided with <em>--if-missing</em> overrides the <code>trailer.ifMissing</code> and any
 925         applicable <code>trailer.&lt;keyAlias&gt;.ifMissing</code> configuration variables
 926         and applies to all <em>--trailer</em> options until the next occurrence of
 927         <em>--if-missing</em> or <em>--no-if-missing</em>. Upon encountering '--no-if-missing,
 928         clear the effect of any previous use of '--if-missing, such that the relevant
 929         configuration variables are no longer overridden. Possible actions are <code>doNothing</code>
 930         or <code>add</code>.
 931 </p>
 932 </dd>
 933 <dt class="hdlist1">
 934 --only-trailers
 935 </dt>
 936 <dd>
 937 <p>
 938         Output only the trailers, not any other parts of the input.
 939 </p>
 940 </dd>
 941 <dt class="hdlist1">
 942 --only-input
 943 </dt>
 944 <dd>
 945 <p>
 946         Output only trailers that exist in the input; do not add any
 947         from the command-line or by applying <code>trailer.*</code> configuration
 948         variables.
 949 </p>
 950 </dd>
 951 <dt class="hdlist1">
 952 --unfold
 953 </dt>
 954 <dd>
 955 <p>
 956         If a trailer has a value that runs over multiple lines (aka "folded"),
 957         reformat the value into a single line.
 958 </p>
 959 </dd>
 960 <dt class="hdlist1">
 961 --parse
 962 </dt>
 963 <dd>
 964 <p>
 965         A convenience alias for <code>--only-trailers --only-input
 966         --unfold</code>. This makes it easier to only see the trailers coming from the
 967         input without influencing them with any command line options or
 968         configuration variables, while also making the output machine-friendly with
 969         --unfold.
 970 </p>
 971 </dd>
 972 <dt class="hdlist1">
 973 --no-divider
 974 </dt>
 975 <dd>
 976 <p>
 977         Do not treat <code>---</code> as the end of the commit message. Use this
 978         when you know your input contains just the commit message itself
 979         (and not an email or the output of <code>git format-patch</code>).
 980 </p>
 981 </dd>
 982 </dl></div>
 983 </div>
 984 </div>
 985 <div class="sect1">
 986 <h2 id="_configuration_variables">CONFIGURATION VARIABLES</h2>
 987 <div class="sectionbody">
 988 <div class="dlist"><dl>
 989 <dt class="hdlist1">
 990 trailer.separators
 991 </dt>
 992 <dd>
 993 <p>
 994         This option tells which characters are recognized as trailer
 995         separators. By default only <em>:</em> is recognized as a trailer
 996         separator, except that <em>=</em> is always accepted on the command
 997         line for compatibility with other git commands.
 998 </p>
 999 <div class="paragraph"><p>The first character given by this option will be the default character
1000 used when another separator is not specified in the config for this
1001 trailer.</p></div>
1002 <div class="paragraph"><p>For example, if the value for this option is "%=$", then only lines
1003 using the format <em>&lt;key&gt;&lt;sep&gt;&lt;value&gt;</em> with &lt;sep&gt; containing <em>%</em>, <em>=</em>
1004 or <em>$</em> and then spaces will be considered trailers. And <em>%</em> will be
1005 the default separator used, so by default trailers will appear like:
1006 <em>&lt;key&gt;% &lt;value&gt;</em> (one percent sign and one space will appear between
1007 the key and the value).</p></div>
1008 </dd>
1009 <dt class="hdlist1">
1010 trailer.where
1011 </dt>
1012 <dd>
1013 <p>
1014         This option tells where a new trailer will be added.
1015 </p>
1016 <div class="paragraph"><p>This can be <code>end</code>, which is the default, <code>start</code>, <code>after</code> or <code>before</code>.</p></div>
1017 <div class="paragraph"><p>If it is <code>end</code>, then each new trailer will appear at the end of the
1018 existing trailers.</p></div>
1019 <div class="paragraph"><p>If it is <code>start</code>, then each new trailer will appear at the start,
1020 instead of the end, of the existing trailers.</p></div>
1021 <div class="paragraph"><p>If it is <code>after</code>, then each new trailer will appear just after the
1022 last trailer with the same &lt;key&gt;.</p></div>
1023 <div class="paragraph"><p>If it is <code>before</code>, then each new trailer will appear just before the
1024 first trailer with the same &lt;key&gt;.</p></div>
1025 </dd>
1026 <dt class="hdlist1">
1027 trailer.ifexists
1028 </dt>
1029 <dd>
1030 <p>
1031         This option makes it possible to choose what action will be
1032         performed when there is already at least one trailer with the
1033         same &lt;key&gt; in the input.
1034 </p>
1035 <div class="paragraph"><p>The valid values for this option are: <code>addIfDifferentNeighbor</code> (this
1036 is the default), <code>addIfDifferent</code>, <code>add</code>, <code>replace</code> or <code>doNothing</code>.</p></div>
1037 <div class="paragraph"><p>With <code>addIfDifferentNeighbor</code>, a new trailer will be added only if no
1038 trailer with the same (&lt;key&gt;, &lt;value&gt;) pair is above or below the line
1039 where the new trailer will be added.</p></div>
1040 <div class="paragraph"><p>With <code>addIfDifferent</code>, a new trailer will be added only if no trailer
1041 with the same (&lt;key&gt;, &lt;value&gt;) pair is already in the input.</p></div>
1042 <div class="paragraph"><p>With <code>add</code>, a new trailer will be added, even if some trailers with
1043 the same (&lt;key&gt;, &lt;value&gt;) pair are already in the input.</p></div>
1044 <div class="paragraph"><p>With <code>replace</code>, an existing trailer with the same &lt;key&gt; will be
1045 deleted and the new trailer will be added. The deleted trailer will be
1046 the closest one (with the same &lt;key&gt;) to the place where the new one
1047 will be added.</p></div>
1048 <div class="paragraph"><p>With <code>doNothing</code>, nothing will be done; that is no new trailer will be
1049 added if there is already one with the same &lt;key&gt; in the input.</p></div>
1050 </dd>
1051 <dt class="hdlist1">
1052 trailer.ifmissing
1053 </dt>
1054 <dd>
1055 <p>
1056         This option makes it possible to choose what action will be
1057         performed when there is not yet any trailer with the same
1058         &lt;key&gt; in the input.
1059 </p>
1060 <div class="paragraph"><p>The valid values for this option are: <code>add</code> (this is the default) and
1061 <code>doNothing</code>.</p></div>
1062 <div class="paragraph"><p>With <code>add</code>, a new trailer will be added.</p></div>
1063 <div class="paragraph"><p>With <code>doNothing</code>, nothing will be done.</p></div>
1064 </dd>
1065 <dt class="hdlist1">
1066 trailer.&lt;keyAlias&gt;.key
1067 </dt>
1068 <dd>
1069 <p>
1070         Defines a &lt;keyAlias&gt; for the &lt;key&gt;. The &lt;keyAlias&gt; must be a
1071         prefix (case does not matter) of the &lt;key&gt;. For example, in <code>git
1072         config trailer.ack.key "Acked-by"</code> the "Acked-by" is the &lt;key&gt; and
1073         the "ack" is the &lt;keyAlias&gt;. This configuration allows the shorter
1074         <code>--trailer "ack:..."</code> invocation on the command line using the "ack"
1075         &lt;keyAlias&gt; instead of the longer <code>--trailer "Acked-by:..."</code>.
1076 </p>
1077 <div class="paragraph"><p>At the end of the &lt;key&gt;, a separator can appear and then some
1078 space characters. By default the only valid separator is <em>:</em>,
1079 but this can be changed using the <code>trailer.separators</code> config
1080 variable.</p></div>
1081 <div class="paragraph"><p>If there is a separator in the key, then it overrides the default
1082 separator when adding the trailer.</p></div>
1083 </dd>
1084 <dt class="hdlist1">
1085 trailer.&lt;keyAlias&gt;.where
1086 </dt>
1087 <dd>
1088 <p>
1089         This option takes the same values as the <em>trailer.where</em>
1090         configuration variable and it overrides what is specified by
1091         that option for trailers with the specified &lt;keyAlias&gt;.
1092 </p>
1093 </dd>
1094 <dt class="hdlist1">
1095 trailer.&lt;keyAlias&gt;.ifexists
1096 </dt>
1097 <dd>
1098 <p>
1099         This option takes the same values as the <em>trailer.ifexists</em>
1100         configuration variable and it overrides what is specified by
1101         that option for trailers with the specified &lt;keyAlias&gt;.
1102 </p>
1103 </dd>
1104 <dt class="hdlist1">
1105 trailer.&lt;keyAlias&gt;.ifmissing
1106 </dt>
1107 <dd>
1108 <p>
1109         This option takes the same values as the <em>trailer.ifmissing</em>
1110         configuration variable and it overrides what is specified by
1111         that option for trailers with the specified &lt;keyAlias&gt;.
1112 </p>
1113 </dd>
1114 <dt class="hdlist1">
1115 trailer.&lt;keyAlias&gt;.command
1116 </dt>
1117 <dd>
1118 <p>
1119         Deprecated in favor of <em>trailer.&lt;keyAlias&gt;.cmd</em>.
1120         This option behaves in the same way as <em>trailer.&lt;keyAlias&gt;.cmd</em>, except
1121         that it doesn&#8217;t pass anything as argument to the specified command.
1122         Instead the first occurrence of substring $ARG is replaced by the
1123         &lt;value&gt; that would be passed as argument.
1124 </p>
1125 <div class="paragraph"><p>Note that $ARG in the user&#8217;s command is
1126 only replaced once and that the original way of replacing $ARG is not safe.</p></div>
1127 <div class="paragraph"><p>When both <em>trailer.&lt;keyAlias&gt;.cmd</em> and <em>trailer.&lt;keyAlias&gt;.command</em> are given
1128 for the same &lt;keyAlias&gt;, <em>trailer.&lt;keyAlias&gt;.cmd</em> is used and
1129 <em>trailer.&lt;keyAlias&gt;.command</em> is ignored.</p></div>
1130 </dd>
1131 <dt class="hdlist1">
1132 trailer.&lt;keyAlias&gt;.cmd
1133 </dt>
1134 <dd>
1135 <p>
1136         This option can be used to specify a shell command that will be called
1137         once to automatically add a trailer with the specified &lt;keyAlias&gt;, and then
1138         called each time a <em>--trailer &lt;keyAlias&gt;=&lt;value&gt;</em> argument is specified to
1139         modify the &lt;value&gt; of the trailer that this option would produce.
1140 </p>
1141 <div class="paragraph"><p>When the specified command is first called to add a trailer
1142 with the specified &lt;keyAlias&gt;, the behavior is as if a special
1143 <em>--trailer &lt;keyAlias&gt;=&lt;value&gt;</em> argument was added at the beginning
1144 of the "git interpret-trailers" command, where &lt;value&gt;
1145 is taken to be the standard output of the command with any
1146 leading and trailing whitespace trimmed off.</p></div>
1147 <div class="paragraph"><p>If some <em>--trailer &lt;keyAlias&gt;=&lt;value&gt;</em> arguments are also passed
1148 on the command line, the command is called again once for each
1149 of these arguments with the same &lt;keyAlias&gt;. And the &lt;value&gt; part
1150 of these arguments, if any, will be passed to the command as its
1151 first argument. This way the command can produce a &lt;value&gt; computed
1152 from the &lt;value&gt; passed in the <em>--trailer &lt;keyAlias&gt;=&lt;value&gt;</em> argument.</p></div>
1153 </dd>
1154 </dl></div>
1155 </div>
1156 </div>
1157 <div class="sect1">
1158 <h2 id="_examples">EXAMPLES</h2>
1159 <div class="sectionbody">
1160 <div class="ulist"><ul>
1161 <li>
1162 <p>
1163 Configure a <em>sign</em> trailer with a <em>Signed-off-by</em> key, and then
1164   add two of these trailers to a commit message file:
1165 </p>
1166 <div class="listingblock">
1167 <div class="content">
1168 <pre><code>$ git config trailer.sign.key "Signed-off-by"
1169 $ cat msg.txt
1170 subject
1171
1172 body text
1173 $ git interpret-trailers --trailer 'sign: Alice &lt;alice@example.com&gt;' --trailer 'sign: Bob &lt;bob@example.com&gt;' &lt;msg.txt
1174 subject
1175
1176 body text
1177
1178 Signed-off-by: Alice &lt;alice@example.com&gt;
1179 Signed-off-by: Bob &lt;bob@example.com&gt;</code></pre>
1180 </div></div>
1181 </li>
1182 <li>
1183 <p>
1184 Use the <code>--in-place</code> option to edit a commit message file in place:
1185 </p>
1186 <div class="listingblock">
1187 <div class="content">
1188 <pre><code>$ cat msg.txt
1189 subject
1190
1191 body text
1192
1193 Signed-off-by: Bob &lt;bob@example.com&gt;
1194 $ git interpret-trailers --trailer 'Acked-by: Alice &lt;alice@example.com&gt;' --in-place msg.txt
1195 $ cat msg.txt
1196 subject
1197
1198 body text
1199
1200 Signed-off-by: Bob &lt;bob@example.com&gt;
1201 Acked-by: Alice &lt;alice@example.com&gt;</code></pre>
1202 </div></div>
1203 </li>
1204 <li>
1205 <p>
1206 Extract the last commit as a patch, and add a <em>Cc</em> and a
1207   <em>Reviewed-by</em> trailer to it:
1208 </p>
1209 <div class="listingblock">
1210 <div class="content">
1211 <pre><code>$ git format-patch -1
1212 0001-foo.patch
1213 $ git interpret-trailers --trailer 'Cc: Alice &lt;alice@example.com&gt;' --trailer 'Reviewed-by: Bob &lt;bob@example.com&gt;' 0001-foo.patch &gt;0001-bar.patch</code></pre>
1214 </div></div>
1215 </li>
1216 <li>
1217 <p>
1218 Configure a <em>sign</em> trailer with a command to automatically add a
1219   'Signed-off-by: ' with the author information only if there is no
1220   'Signed-off-by: ' already, and show how it works:
1221 </p>
1222 <div class="listingblock">
1223 <div class="content">
1224 <pre><code>$ cat msg1.txt
1225 subject
1226
1227 body text
1228 $ git config trailer.sign.key "Signed-off-by: "
1229 $ git config trailer.sign.ifmissing add
1230 $ git config trailer.sign.ifexists doNothing
1231 $ git config trailer.sign.cmd 'echo "$(git config user.name) &lt;$(git config user.email)&gt;"'
1232 $ git interpret-trailers --trailer sign &lt;msg1.txt
1233 subject
1234
1235 body text
1236
1237 Signed-off-by: Bob &lt;bob@example.com&gt;
1238 $ cat msg2.txt
1239 subject
1240
1241 body text
1242
1243 Signed-off-by: Alice &lt;alice@example.com&gt;
1244 $ git interpret-trailers --trailer sign &lt;msg2.txt
1245 subject
1246
1247 body text
1248
1249 Signed-off-by: Alice &lt;alice@example.com&gt;</code></pre>
1250 </div></div>
1251 </li>
1252 <li>
1253 <p>
1254 Configure a <em>fix</em> trailer with a key that contains a <em>#</em> and no
1255   space after this character, and show how it works:
1256 </p>
1257 <div class="listingblock">
1258 <div class="content">
1259 <pre><code>$ git config trailer.separators ":#"
1260 $ git config trailer.fix.key "Fix #"
1261 $ echo "subject" | git interpret-trailers --trailer fix=42
1262 subject
1263
1264 Fix #42</code></pre>
1265 </div></div>
1266 </li>
1267 <li>
1268 <p>
1269 Configure a <em>help</em> trailer with a cmd use a script <code>glog-find-author</code>
1270   which search specified author identity from git log in git repository
1271   and show how it works:
1272 </p>
1273 <div class="listingblock">
1274 <div class="content">
1275 <pre><code>$ cat ~/bin/glog-find-author
1276 #!/bin/sh
1277 test -n "$1" &amp;&amp; git log --author="$1" --pretty="%an &lt;%ae&gt;" -1 || true
1278 $ cat msg.txt
1279 subject
1280
1281 body text
1282 $ git config trailer.help.key "Helped-by: "
1283 $ git config trailer.help.ifExists "addIfDifferentNeighbor"
1284 $ git config trailer.help.cmd "~/bin/glog-find-author"
1285 $ git interpret-trailers --trailer="help:Junio" --trailer="help:Couder" &lt;msg.txt
1286 subject
1287
1288 body text
1289
1290 Helped-by: Junio C Hamano &lt;gitster@pobox.com&gt;
1291 Helped-by: Christian Couder &lt;christian.couder@gmail.com&gt;</code></pre>
1292 </div></div>
1293 </li>
1294 <li>
1295 <p>
1296 Configure a <em>ref</em> trailer with a cmd use a script <code>glog-grep</code>
1297   to grep last relevant commit from git log in the git repository
1298   and show how it works:
1299 </p>
1300 <div class="listingblock">
1301 <div class="content">
1302 <pre><code>$ cat ~/bin/glog-grep
1303 #!/bin/sh
1304 test -n "$1" &amp;&amp; git log --grep "$1" --pretty=reference -1 || true
1305 $ cat msg.txt
1306 subject
1307
1308 body text
1309 $ git config trailer.ref.key "Reference-to: "
1310 $ git config trailer.ref.ifExists "replace"
1311 $ git config trailer.ref.cmd "~/bin/glog-grep"
1312 $ git interpret-trailers --trailer="ref:Add copyright notices." &lt;msg.txt
1313 subject
1314
1315 body text
1316
1317 Reference-to: 8bc9a0c769 (Add copyright notices., 2005-04-07)</code></pre>
1318 </div></div>
1319 </li>
1320 <li>
1321 <p>
1322 Configure a <em>see</em> trailer with a command to show the subject of a
1323   commit that is related, and show how it works:
1324 </p>
1325 <div class="listingblock">
1326 <div class="content">
1327 <pre><code>$ cat msg.txt
1328 subject
1329
1330 body text
1331
1332 see: HEAD~2
1333 $ cat ~/bin/glog-ref
1334 #!/bin/sh
1335 git log -1 --oneline --format="%h (%s)" --abbrev-commit --abbrev=14
1336 $ git config trailer.see.key "See-also: "
1337 $ git config trailer.see.ifExists "replace"
1338 $ git config trailer.see.ifMissing "doNothing"
1339 $ git config trailer.see.cmd "glog-ref"
1340 $ git interpret-trailers --trailer=see &lt;msg.txt
1341 subject
1342
1343 body text
1344
1345 See-also: fe3187489d69c4 (subject of related commit)</code></pre>
1346 </div></div>
1347 </li>
1348 <li>
1349 <p>
1350 Configure a commit template with some trailers with empty values
1351   (using sed to show and keep the trailing spaces at the end of the
1352   trailers), then configure a commit-msg hook that uses
1353   <em>git interpret-trailers</em> to remove trailers with empty values and
1354   to add a <em>git-version</em> trailer:
1355 </p>
1356 <div class="listingblock">
1357 <div class="content">
1358 <pre><code>$ cat temp.txt
1359 ***subject***
1360
1361 ***message***
1362
1363 Fixes: Z
1364 Cc: Z
1365 Reviewed-by: Z
1366 Signed-off-by: Z
1367 $ sed -e 's/ Z$/ /' temp.txt &gt; commit_template.txt
1368 $ git config commit.template commit_template.txt
1369 $ cat .git/hooks/commit-msg
1370 #!/bin/sh
1371 git interpret-trailers --trim-empty --trailer "git-version: \$(git describe)" "\$1" &gt; "\$1.new"
1372 mv "\$1.new" "\$1"
1373 $ chmod +x .git/hooks/commit-msg</code></pre>
1374 </div></div>
1375 </li>
1376 </ul></div>
1377 </div>
1378 </div>
1379 <div class="sect1">
1380 <h2 id="_see_also">SEE ALSO</h2>
1381 <div class="sectionbody">
1382 <div class="paragraph"><p><a href="git-commit.html">git-commit(1)</a>, <a href="git-format-patch.html">git-format-patch(1)</a>, <a href="git-config.html">git-config(1)</a></p></div>
1383 </div>
1384 </div>
1385 <div class="sect1">
1386 <h2 id="_git">GIT</h2>
1387 <div class="sectionbody">
1388 <div class="paragraph"><p>Part of the <a href="git.html">git(1)</a> suite</p></div>
1389 </div>
1390 </div>
1391 </div>
1392 <div id="footnotes"><hr /></div>
1393 <div id="footer">
1394 <div id="footer-text">
1395 Last updated
1396  2023-10-13 15:25:25 PDT
1397 </div>
1398 </div>
1399 </body>
1400 </html>