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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] [file to merge] ...'
SUBDIRECTORY_OK=Yes
. git-sh-setup
require_work_tree
prefix=$(git rev-parse --show-prefix)

# 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" "$path.orig"
rm -f -- "$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 "$ans" in
[lL]*)
git checkout-index -f --stage=2 -- "$path"
git add -- "$path"
cleanup_temp_files --save-backup
return
;;
[rR]*)
git checkout-index -f --stage=3 -- "$path"
git add -- "$path"
cleanup_temp_files --save-backup
return
;;
[aA]*)
exit 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 "$ans" in
[mMcC]*)
git add -- "$path"
cleanup_temp_files --save-backup
return
;;
[dD]*)
git rm -- "$path" > /dev/null
cleanup_temp_files
return
;;
[aA]*)
exit 1
;;
esac
done
}

check_unchanged () {
    if test "$path" -nt "$BACKUP" ; then
status=0;
    else
while true; do
echo "$path seems unchanged."
printf "Was the merge successful? [y/n] "
read answer < /dev/tty
case "$answer" in
y*|Y*) status=0; break ;;
n*|N*) status=1; break ;;
esac
done
    fi
}

save_backup () {
    if test "$status" -eq 0; then
mv -- "$BACKUP" "$path.orig"
    fi
}

remove_backup () {
    if test "$status" -eq 0; then
rm "$BACKUP"
    fi
}

merge_file () {
    path="$1"

    f=`git ls-files -u -- "$path"`
    if test -z "$f" ; then
if test ! -f "$path" ; then
echo "$path: file not found"
else
echo "$path: file does not need merging"
fi
exit 1
    fi

    BACKUP="$path.BACKUP.$$"
    LOCAL="$path.LOCAL.$$"
    REMOTE="$path.REMOTE.$$"
    BASE="$path.BASE.$$"

    mv -- "$path" "$BACKUP"
    cp -- "$BACKUP" "$path"

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

    base_present && git cat-file blob ":1:$prefix$path" >"$BASE" 2>/dev/null
    local_present && git cat-file blob ":2:$prefix$path" >"$LOCAL" 2>/dev/null
    remote_present && git cat-file blob ":3:$prefix$path" >"$REMOTE" 2>/dev/null

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

    echo "Normal merge conflict for '$path':"
    describe_file "$local_mode" "local" "$LOCAL"
    describe_file "$remote_mode" "remote" "$REMOTE"
    printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
    read ans

    case "$merge_tool" in
kdiff3)
if base_present ; then
(kdiff3 --auto --L1 "$path (Base)" --L2 "$path (Local)" --L3 "$path (Remote)" \
-o "$path" -- "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
else
(kdiff3 --auto --L1 "$path (Local)" --L2 "$path (Remote)" \
-o "$path" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
fi
status=$?
remove_backup
;;
tkdiff)
if base_present ; then
tkdiff -a "$BASE" -o "$path" -- "$LOCAL" "$REMOTE"
else
tkdiff -o "$path" -- "$LOCAL" "$REMOTE"
fi
status=$?
save_backup
;;
meld|vimdiff)
touch "$BACKUP"
$merge_tool -- "$LOCAL" "$path" "$REMOTE"
check_unchanged
save_backup
;;
gvimdiff)
touch "$BACKUP"
gvimdiff -f -- "$LOCAL" "$path" "$REMOTE"
check_unchanged
save_backup
;;
xxdiff)
touch "$BACKUP"
if base_present ; then
xxdiff -X --show-merged-pane \
-R 'Accel.SaveAsMerged: "Ctrl-S"' \
-R 'Accel.Search: "Ctrl+F"' \
-R 'Accel.SearchForward: "Ctrl-G"' \
--merged-file "$path" -- "$LOCAL" "$BASE" "$REMOTE"
else
xxdiff -X --show-merged-pane \
-R 'Accel.SaveAsMerged: "Ctrl-S"' \
-R 'Accel.Search: "Ctrl+F"' \
-R 'Accel.SearchForward: "Ctrl-G"' \
--merged-file "$path" -- "$LOCAL" "$REMOTE"
fi
check_unchanged
save_backup
;;
opendiff)
touch "$BACKUP"
if base_present; then
opendiff "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$path" | cat
else
opendiff "$LOCAL" "$REMOTE" -merge "$path" | cat
fi
check_unchanged
save_backup
;;
emerge)
if base_present ; then
emacs -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$path")"
else
emacs -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$path")"
fi
status=$?
save_backup
;;
    esac
    if test "$status" -ne 0; then
echo "merge of $path failed" 1>&2
mv -- "$BACKUP" "$path"
exit 1
    fi
    git add -- "$path"
    cleanup_temp_files
}

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
;;
--)
break
;;
-*)
usage
;;
*)
break
;;
    esac
    shift
done

if test -z "$merge_tool"; then
    merge_tool=`git config merge.tool`
    case "$merge_tool" in
kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | "")
;; # happy
*)
echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
echo >&2 "Resetting to default..."
unset merge_tool
;;
    esac
fi

if test -z "$merge_tool" ; then
    if test -n "$DISPLAY"; then
        merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
        if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
            merge_tool_candidates="meld $merge_tool_candidates"
        fi
        if test "$KDE_FULL_SESSION" = "true"; then
            merge_tool_candidates="kdiff3 $merge_tool_candidates"
        fi
    fi
    if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
        merge_tool_candidates="$merge_tool_candidates emerge"
    fi
    if echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
        merge_tool_candidates="$merge_tool_candidates vimdiff"
    fi
    merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
    echo "merge tool candidates: $merge_tool_candidates"
    for i in $merge_tool_candidates; do
        if test $i = emerge ; then
            cmd=emacs
        else
            cmd=$i
        fi
        if type $cmd > /dev/null 2>&1; then
            merge_tool=$i
            break
fi
    done
    if test -z "$merge_tool" ; then
echo "No available merge resolution programs available."
exit 1
    fi
fi

case "$merge_tool" in
    kdiff3|tkdiff|meld|xxdiff|vimdiff|gvimdiff|opendiff)
if ! type "$merge_tool" > /dev/null 2>&1; then
echo "The merge tool $merge_tool is not available"
exit 1
fi
;;
    emerge)
if ! type "emacs" > /dev/null 2>&1; then
echo "Emacs is not available"
exit 1
fi
;;
    *)
echo "Unknown merge tool: $merge_tool"
exit 1
;;
esac

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: $files
git ls-files -u | sed -e 's/^[^ ]* //' | sort -u | while read i
do
printf "\n"
merge_file "$i" < /dev/tty > /dev/tty
done
else
while test $# -gt 0; do
printf "\n"
merge_file "$1"
shift
done
fi
exit 0
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