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#!/bin/sh
#
# This program resolves merge conflicts in git
#
# Copyright (c) 2006 Theodore Y. Ts'o
#
# This file is licensed under the GPL v2, or a later version
# at the discretion of Junio C Hamano.
#

USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
SUBDIRECTORY_OK=Yes
OPTIONS_SPEC=
TOOL_MODE=merge
. git-sh-setup
. git-mergetool--lib
require_work_tree

# Returns true if the mode reflects a symlink
is_symlink () {
    test "$1" = 120000
}

local_present () {
    test -n "$local_mode"
}

remote_present () {
    test -n "$remote_mode"
}

base_present () {
    test -n "$base_mode"
}

cleanup_temp_files () {
    if test "$1" = --save-backup ; then
mv -- "$BACKUP" "$MERGED.orig"
rm -f -- "$LOCAL" "$REMOTE" "$BASE"
    else
rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
    fi
}

describe_file () {
    mode="$1"
    branch="$2"
    file="$3"

    printf " {%s}: " "$branch"
    if test -z "$mode"; then
echo "deleted"
    elif is_symlink "$mode" ; then
echo "a symbolic link -> '$(cat "$file")'"
    else
if base_present; then
echo "modified"
else
echo "created"
fi
fi
}


resolve_symlink_merge () {
    while true; do
printf "Use (l)ocal or (r)emote, or (a)bort? "
read ans
case "$ans" in
[lL]*)
git checkout-index -f --stage=2 -- "$MERGED"
git add -- "$MERGED"
cleanup_temp_files --save-backup
return 0
;;
[rR]*)
git checkout-index -f --stage=3 -- "$MERGED"
git add -- "$MERGED"
cleanup_temp_files --save-backup
return 0
;;
[aA]*)
return 1
;;
esac
done
}

resolve_deleted_merge () {
    while true; do
if base_present; then
printf "Use (m)odified or (d)eleted file, or (a)bort? "
else
printf "Use (c)reated or (d)eleted file, or (a)bort? "
fi
read ans
case "$ans" in
[mMcC]*)
git add -- "$MERGED"
cleanup_temp_files --save-backup
return 0
;;
[dD]*)
git rm -- "$MERGED" > /dev/null
cleanup_temp_files
return 0
;;
[aA]*)
return 1
;;
esac
done
}

checkout_staged_file () {
    tmpfile=$(expr "$(git checkout-index --temp --stage="$1" "$2")" : '\([^ ]*\) ')

    if test $? -eq 0 -a -n "$tmpfile" ; then
mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
    fi
}

merge_file () {
    MERGED="$1"

    f=$(git ls-files -u -- "$MERGED")
    if test -z "$f" ; then
if test ! -f "$MERGED" ; then
echo "$MERGED: file not found"
else
echo "$MERGED: file does not need merging"
fi
return 1
    fi

ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
    BACKUP="./$MERGED.BACKUP.$ext"
    LOCAL="./$MERGED.LOCAL.$ext"
    REMOTE="./$MERGED.REMOTE.$ext"
    BASE="./$MERGED.BASE.$ext"

    mv -- "$MERGED" "$BACKUP"
    cp -- "$BACKUP" "$MERGED"

    base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
    local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
    remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')

    base_present && checkout_staged_file 1 "$MERGED" "$BASE"
    local_present && checkout_staged_file 2 "$MERGED" "$LOCAL"
    remote_present && checkout_staged_file 3 "$MERGED" "$REMOTE"

    if test -z "$local_mode" -o -z "$remote_mode"; then
echo "Deleted merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$LOCAL"
describe_file "$remote_mode" "remote" "$REMOTE"
resolve_deleted_merge
return
fi

if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
echo "Symbolic link merge conflict for '$MERGED':"
describe_file "$local_mode" "local" "$LOCAL"
describe_file "$remote_mode" "remote" "$REMOTE"
resolve_symlink_merge
return
fi

echo "Normal merge conflict for '$MERGED':"
    describe_file "$local_mode" "local" "$LOCAL"
    describe_file "$remote_mode" "remote" "$REMOTE"
    if "$prompt" = true; then
printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
read ans
    fi

if base_present; then
present=true
else
present=false
fi

if ! run_merge_tool "$merge_tool" "$present"; then
echo "merge of $MERGED failed" 1>&2
mv -- "$BACKUP" "$MERGED"

if test "$merge_keep_temporaries" = "false"; then
cleanup_temp_files
fi

return 1
    fi

if test "$merge_keep_backup" = "true"; then
mv -- "$BACKUP" "$MERGED.orig"
    else
rm -- "$BACKUP"
    fi

git add -- "$MERGED"
    cleanup_temp_files
    return 0
}

prompt=$(git config --bool mergetool.prompt || echo true)

while test $# != 0
do
case "$1" in
-t|--tool*)
case "$#,$1" in
*,*=*)
merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
;;
1,*)
usage ;;
*)
merge_tool="$2"
shift ;;
esac
;;
-y|--no-prompt)
prompt=false
;;
--prompt)
prompt=true
;;
--)
shift
break
;;
-*)
usage
;;
*)
break
;;
    esac
shift
done

prompt_after_failed_merge() {
    while true; do
printf "Continue merging other unresolved paths (y/n) ? "
read ans
case "$ans" in

[yY]*)
return 0
;;

[nN]*)
return 1
;;
esac
done
}

if test -z "$merge_tool"; then
merge_tool=$(get_merge_tool "$merge_tool") || exit
fi
merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"

last_status=0
rollup_status=0

if test $# -eq 0 ; then
files=$(git ls-files -u | sed -e 's/^[^ ]* //' | sort -u)
    if test -z "$files" ; then
echo "No files need merging"
exit 0
    fi
echo Merging the files: "$files"
    git ls-files -u |
    sed -e 's/^[^ ]* //' |
    sort -u |
    while IFS= read i
    do
if test $last_status -ne 0; then
prompt_after_failed_merge < /dev/tty || exit 1
fi
printf "\n"
merge_file "$i" < /dev/tty > /dev/tty
last_status=$?
if test $last_status -ne 0; then
rollup_status=1
fi
done
else
while test $# -gt 0; do
if test $last_status -ne 0; then
prompt_after_failed_merge || exit 1
fi
printf "\n"
merge_file "$1"
last_status=$?
if test $last_status -ne 0; then
rollup_status=1
fi
shift
done
fi

exit $rollup_status
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