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| author | ZheNing Hu <adlternative@gmail.com> | 2021-05-03 15:41:04 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2021-05-04 12:09:43 +0900 |
| commit | 57dcb6575b577a70f02814df4291e8af6ed81f86 (patch) | |
| tree | f113e6d6825c532ddb3ecc7232a48dafad7b016a /Documentation/git-interpret-trailers.txt | |
| parent | 2daae3d1d1bf513f1e1c00f1e4df75e1cb500e0f (diff) | |
| download | git-57dcb6575b577a70f02814df4291e8af6ed81f86.tar.gz | |
docs: correct descript of trailer.<token>.command
In the original documentation of `trailer.<token>.command`,
some descriptions are easily misunderstood. So let's modify
it to increase its readability.
In addition, clarify that `$ARG` in command can only be
replaced once.
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'Documentation/git-interpret-trailers.txt')
| -rw-r--r-- | Documentation/git-interpret-trailers.txt | 37 |
1 files changed, 21 insertions, 16 deletions
diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt index 96ec6499f0..6f2a7a1304 100644 --- a/Documentation/git-interpret-trailers.txt +++ b/Documentation/git-interpret-trailers.txt @@ -232,25 +232,30 @@ trailer.<token>.ifmissing:: that option for trailers with the specified <token>. trailer.<token>.command:: - This option can be used to specify a shell command that will - be called to automatically add or modify a trailer with the - specified <token>. + This option can be used to specify a shell command that will be called: + once to automatically add a trailer with the specified <token>, and then + each time a '--trailer <token>=<value>' argument to modify the <value> of + the trailer that this option would produce. + -When this option is specified, the behavior is as if a special -'<token>=<value>' argument were added at the beginning of the command -line, where <value> is taken to be the standard output of the -specified command with any leading and trailing whitespace trimmed -off. +When the specified command is first called to add a trailer +with the specified <token>, the behavior is as if a special +'--trailer <token>=<value>' argument was added at the beginning +of the "git interpret-trailers" command, where <value> +is taken to be the standard output of the command with any +leading and trailing whitespace trimmed off. + -If the command contains the `$ARG` string, this string will be -replaced with the <value> part of an existing trailer with the same -<token>, if any, before the command is launched. +If some '--trailer <token>=<value>' arguments are also passed +on the command line, the command is called again once for each +of these arguments with the same <token>. And the <value> part +of these arguments, if any, will be used to replace the first +occurrence of substring `$ARG` in the command. This way the +command can produce a <value> computed from the <value> passed +in the '--trailer <token>=<value>' argument. + -If some '<token>=<value>' arguments are also passed on the command -line, when a 'trailer.<token>.command' is configured, the command will -also be executed for each of these arguments. And the <value> part of -these arguments, if any, will be used to replace the `$ARG` string in -the command. +For consistency, the first occurrence of substring `$ARG` is +also replaced, this time with the empty string, in the command +when the command is first called to add a trailer with the +specified <token>. EXAMPLES -------- |