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merge-tool documentation: describe custom command usage
The configuration variables for custom merge tools were documented only in config.txt but there was no reference to the functionality in git-mergetool.txt. Signed-off-by: Charles Bailey <charles@hashpling.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -37,6 +37,28 @@ configuration variable `mergetool.<tool>.path`. For example, you
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can configure the absolute path to kdiff3 by setting
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`mergetool.kdiff3.path`. Otherwise, `git mergetool` assumes the
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tool is available in PATH.
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+
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Instead of running one of the known merge tool programs
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`git mergetool` can be customized to run an alternative program
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by specifying the command line to invoke in a configration
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variable `mergetool.<tool>.cmd`.
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+
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When `git mergetool` is invoked with this tool (either through the
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`-t` or `--tool` option or the `merge.tool` configuration
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variable) the configured command line will be invoked with `$BASE`
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set to the name of a temporary file containing the common base for
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the merge, if available; `$LOCAL` set to the name of a temporary
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file containing the contents of the file on the current branch;
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`$REMOTE` set to the name of a temporary file containing the
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contents of the file to be merged, and `$MERGED` set to the name
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of the file to which the merge tool should write the result of the
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merge resolution.
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+
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If the custom merge tool correctly indicates the success of a
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merge resolution with its exit code then the configuration
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variable `mergetool.<tool>.trustExitCode` can be set to `true`.
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Otherwise, `git mergetool` will prompt the user to indicate the
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success of the resolution after the custom tool has exited.
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Author
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------
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