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name : git-jump
 #!/bin/sh

usage() {
	cat <<\EOF
usage: git jump [--stdout] <mode> [<args>]

Jump to interesting elements in an editor.
The <mode> parameter is one of:

diff: elements are diff hunks. Arguments are given to diff.

merge: elements are merge conflicts. Arguments are given to ls-files -u.

grep: elements are grep hits. Arguments are given to git grep or, if
      configured, to the command in `jump.grepCmd`.

ws: elements are whitespace errors. Arguments are given to diff --check.

If the optional argument `--stdout` is given, print the quickfix
lines to standard output instead of feeding it to the editor.
EOF
}

open_editor() {
	editor=`git var GIT_EDITOR`
	case "$editor" in
	*emacs*)
		# Supported editor values are:
		# - emacs
		# - emacsclient
		# - emacsclient -t
		#
		# Wait for completion of the asynchronously executed process
		# to avoid race conditions in case of "emacsclient".
		eval "$editor --eval \"(let ((buf (grep \\\"cat \$1\\\"))) (pop-to-buffer buf) (select-frame-set-input-focus (selected-frame)) (while (get-buffer-process buf) (sleep-for 0.1)))\""
		;;
	*)
		# assume anything else is vi-compatible
		eval "$editor -q \$1"
		;;
	esac
}

mode_diff() {
	git diff --no-prefix --relative "$@" |
	perl -ne '
	if (m{^\+\+\+ (.*)}) { $file = $1; next }
	defined($file) or next;
	if (m/^@@ .*?\+(\d+)/) { $line = $1; next }
	defined($line) or next;
	if (/^ /) { $line++; next }
	if (/^[-+]\s*(.*)/) {
		print "$file:$line: $1\n";
		$line = undef;
	}
	'
}

mode_merge() {
	git ls-files -u "$@" |
	perl -pe 's/^.*?\t//' |
	sort -u |
	while IFS= read fn; do
		grep -Hn '^<<<<<<<' "$fn"
	done
}

# Grep -n generates nice quickfix-looking lines by itself,
# but let's clean up extra whitespace, so they look better if the
# editor shows them to us in the status bar.
mode_grep() {
	cmd=$(git config jump.grepCmd)
	test -n "$cmd" || cmd="git grep -n --column"
	$cmd "$@" |
	perl -pe '
	s/[ \t]+/ /g;
	s/^ *//;
	'
}

mode_ws() {
	git diff --check "$@"
}

use_stdout=
while test $# -gt 0; do
	case "$1" in
	--stdout)
		use_stdout=t
		;;
	--*)
		usage >&2
		exit 1
		;;
	*)
		break
		;;
	esac
	shift
done
if test $# -lt 1; then
	usage >&2
	exit 1
fi
mode=$1; shift
type "mode_$mode" >/dev/null 2>&1 || { usage >&2; exit 1; }

if test "$use_stdout" = "t"; then
	"mode_$mode" "$@"
	exit 0
fi

trap 'rm -f "$tmp"' 0 1 2 3 15
tmp=`mktemp -t git-jump.XXXXXX` || exit 1
"mode_$mode" "$@" >"$tmp"
test -s "$tmp" || exit 0
open_editor "$tmp"
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