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-rwxr-xr-xgit-mergetool.sh365
1 files changed, 365 insertions, 0 deletions
diff --git a/git-mergetool.sh b/git-mergetool.sh
new file mode 100755
index 0000000000..e62351bcba
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+++ b/git-mergetool.sh
@@ -0,0 +1,365 @@
+#!/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 Hammano.
+#
+
+USAGE='[--tool=tool] [file to merge] ...'
+SUBDIRECTORY_OK=Yes
+. git-sh-setup
+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" "$path.orig"
+ rm -f -- "$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 $1;}'`
+
+ base_present && git cat-file blob ":1:$path" > "$BASE" 2>/dev/null
+ local_present && git cat-file blob ":2:$path" > "$LOCAL" 2>/dev/null
+ remote_present && git cat-file blob ":3:$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
+ ;;
+ 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" "$BASE" "$path"
+ else
+ emacs -f emerge-files-command "$LOCAL" "$REMOTE" "$path"
+ fi
+ status=$?
+ 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 case $# in 0) break ;; esac
+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 | "")
+ ;; # 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 type kdiff3 >/dev/null 2>&1 && test -n "$DISPLAY"; then
+ merge_tool="kdiff3";
+ elif type tkdiff >/dev/null 2>&1 && test -n "$DISPLAY"; then
+ merge_tool=tkdiff
+ elif type xxdiff >/dev/null 2>&1 && test -n "$DISPLAY"; then
+ merge_tool=xxdiff
+ elif type meld >/dev/null 2>&1 && test -n "$DISPLAY"; then
+ merge_tool=meld
+ elif type opendiff >/dev/null 2>&1; then
+ merge_tool=opendiff
+ elif type emacs >/dev/null 2>&1; then
+ merge_tool=emerge
+ elif type vimdiff >/dev/null 2>&1; then
+ merge_tool=vimdiff
+ else
+ echo "No available merge resolution programs available."
+ exit 1
+ fi
+fi
+
+case "$merge_tool" in
+ kdiff3|tkdiff|meld|xxdiff|vimdiff|opendiff)
+ if ! type "$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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