compat: Add simplified merge sort implementation from glibc
[gitweb.git] / git-mergetool.sh
index 9f4f3134b60174495c23968cf1ca01ffdbc49bdf..cbbb707959cc64427f7bbd7bfefb0a8f0f263596 100755 (executable)
@@ -10,6 +10,7 @@
 
 USAGE='[--tool=tool] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
+OPTIONS_SPEC=
 . git-sh-setup
 require_work_tree
 prefix=$(git rev-parse --show-prefix)
@@ -151,10 +152,11 @@ merge_file () {
        exit 1
     fi
 
-    BACKUP="$path.BACKUP.$$"
-    LOCAL="$path.LOCAL.$$"
-    REMOTE="$path.REMOTE.$$"
-    BASE="$path.BASE.$$"
+    ext="$$$(expr "$path" : '.*\(\.[^/]*\)$')"
+    BACKUP="$path.BACKUP.$ext"
+    LOCAL="$path.LOCAL.$ext"
+    REMOTE="$path.REMOTE.$ext"
+    BASE="$path.BASE.$ext"
 
     mv -- "$path" "$BACKUP"
     cp -- "$BACKUP" "$path"
@@ -192,10 +194,10 @@ merge_file () {
     case "$merge_tool" in
        kdiff3)
            if base_present ; then
-               (kdiff3 --auto --L1 "$path (Base)" --L2 "$path (Local)" --L3 "$path (Remote)" \
+               ("$merge_tool_path" --auto --L1 "$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)" \
+               ("$merge_tool_path" --auto --L1 "$path (Local)" --L2 "$path (Remote)" \
                    -o "$path" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
            fi
            status=$?
@@ -203,35 +205,35 @@ merge_file () {
            ;;
        tkdiff)
            if base_present ; then
-               tkdiff -a "$BASE" -o "$path" -- "$LOCAL" "$REMOTE"
+               "$merge_tool_path" -a "$BASE" -o "$path" -- "$LOCAL" "$REMOTE"
            else
-               tkdiff -o "$path" -- "$LOCAL" "$REMOTE"
+               "$merge_tool_path" -o "$path" -- "$LOCAL" "$REMOTE"
            fi
            status=$?
            save_backup
            ;;
        meld|vimdiff)
            touch "$BACKUP"
-           $merge_tool -- "$LOCAL" "$path" "$REMOTE"
+           "$merge_tool_path" -- "$LOCAL" "$path" "$REMOTE"
            check_unchanged
            save_backup
            ;;
        gvimdiff)
                touch "$BACKUP"
-               gvimdiff -f -- "$LOCAL" "$path" "$REMOTE"
+               "$merge_tool_path" -f -- "$LOCAL" "$path" "$REMOTE"
                check_unchanged
                save_backup
                ;;
        xxdiff)
            touch "$BACKUP"
            if base_present ; then
-               xxdiff -X --show-merged-pane \
+               "$merge_tool_path" -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 \
+               "$merge_tool_path" -X --show-merged-pane \
                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
                    -R 'Accel.Search: "Ctrl+F"' \
                    -R 'Accel.SearchForward: "Ctrl-G"' \
@@ -243,18 +245,28 @@ merge_file () {
        opendiff)
            touch "$BACKUP"
            if base_present; then
-               opendiff "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$path" | cat
+               "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$path" | cat
            else
-               opendiff "$LOCAL" "$REMOTE" -merge "$path" | cat
+               "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$path" | cat
+           fi
+           check_unchanged
+           save_backup
+           ;;
+       ecmerge)
+           touch "$BACKUP"
+           if base_present; then
+               "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --mode=merge3 --to="$path"
+           else
+               "$merge_tool_path" "$LOCAL" "$REMOTE" --mode=merge2 --to="$path"
            fi
            check_unchanged
            save_backup
            ;;
        emerge)
            if base_present ; then
-               emacs -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$path")"
+               "$merge_tool_path" -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$path")"
            else
-               emacs -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$path")"
+               "$merge_tool_path" -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$path")"
            fi
            status=$?
            save_backup
@@ -297,17 +309,38 @@ do
     shift
 done
 
+valid_tool() {
+       case "$1" in
+               kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
+                       ;; # happy
+               *)
+                       return 1
+                       ;;
+       esac
+}
+
+init_merge_tool_path() {
+       merge_tool_path=`git config mergetool.$1.path`
+       if test -z "$merge_tool_path" ; then
+               case "$1" in
+                       emerge)
+                               merge_tool_path=emacs
+                               ;;
+                       *)
+                               merge_tool_path=$1
+                               ;;
+               esac
+       fi
+}
+
+
 if test -z "$merge_tool"; then
     merge_tool=`git config merge.tool`
-    case "$merge_tool" in
-       kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | "")
-           ;; # happy
-       *)
+    if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
            echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
            echo >&2 "Resetting to default..."
            unset merge_tool
-           ;;
-    esac
+    fi
 fi
 
 if test -z "$merge_tool" ; then
@@ -329,40 +362,30 @@ if test -z "$merge_tool" ; then
     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
+        init_merge_tool_path $i
+        if type "$merge_tool_path" > /dev/null 2>&1; then
             merge_tool=$i
             break
         fi
     done
     if test -z "$merge_tool" ; then
-       echo "No available merge resolution programs available."
+       echo "No known merge resolution program available."
        exit 1
     fi
+else
+    if ! valid_tool "$merge_tool"; then
+        echo >&2 "Unknown merge_tool $merge_tool"
+        exit 1
+    fi
+
+    init_merge_tool_path "$merge_tool"
+
+    if ! type "$merge_tool_path" > /dev/null 2>&1; then
+        echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
+        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`
@@ -370,8 +393,11 @@ if test $# -eq 0 ; then
                echo "No files need merging"
                exit 0
        fi
-       echo Merging the files: $files
-       git ls-files -u | sed -e 's/^[^ ]*      //' | sort -u | while read i
+       echo Merging the files: "$files"
+       git ls-files -u |
+       sed -e 's/^[^   ]*      //' |
+       sort -u |
+       while IFS= read i
        do
                printf "\n"
                merge_file "$i" < /dev/tty > /dev/tty