NBash

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#!/bin/sh
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#
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# An example hook script to prepare the commit log message.
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# Called by "git commit" with the name of the file that has the
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# commit message, followed by the description of the commit
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# message's source.  The hook's purpose is to edit the commit
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# message file.  If the hook fails with a non-zero status,
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# the commit is aborted.
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#
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# To enable this hook, rename this file to "prepare-commit-msg".
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# This hook includes three examples. The first one removes the
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# "# Please enter the commit message..." help message.
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#
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# The second includes the output of "git diff --name-status -r"
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# into the message, just before the "git status" output.  It is
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# commented because it doesn't cope with --amend or with squashed
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# commits.
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#
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# The third example adds a Signed-off-by line to the message, that can
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# still be edited.  This is rarely a good idea.
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COMMIT_MSG_FILE=$1
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COMMIT_SOURCE=$2
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SHA1=$3
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perl -i.bak -ne 'print unless(m/^. Please enter the commit message/..m/^#$/)' "$COMMIT_MSG_FILE"
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# case "$COMMIT_SOURCE,$SHA1" in
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#  ,|template,)
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#    perl -i.bak -pe '
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#       print "\n" . `git diff --cached --name-status -r`
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# 	 if /^#/ && $first++ == 0' "$COMMIT_MSG_FILE" ;;
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#  *) ;;
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# esac
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# SOB=$(git var GIT_COMMITTER_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
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# git interpret-trailers --in-place --trailer "$SOB" "$COMMIT_MSG_FILE"
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# if test -z "$COMMIT_SOURCE"
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# then
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#   perl -i.bak -pe 'print "\n" if !$first_line++' "$COMMIT_MSG_FILE"
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# fi
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