t9001: style modernisation phase #4

diff --git a/git-mergetool.sh b/git-mergetool.sh
index 83863f2288a6a5252e55a6a8d1ffe7876e27bfab..ff050e58ff3b752113105ba3ea5e20c6b633aae9 100755 (executable)
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -10,11 +10,11 @@
 
 USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
+NONGIT_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 () {
@@ -222,7 +222,7 @@ checkout_staged_file () {
                "$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
                : '\([^ ]*\)    ')
 
-       if test $? -eq 0 -a -n "$tmpfile"
+       if test $? -eq 0 && test -n "$tmpfile"
        then
                mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
        else
@@ -289,7 +289,7 @@ merge_file () {
        checkout_staged_file 2 "$MERGED" "$LOCAL"
        checkout_staged_file 3 "$MERGED" "$REMOTE"
 
-       if test -z "$local_mode" -o -z "$remote_mode"
+       if test -z "$local_mode" || test -z "$remote_mode"
        then
                echo "Deleted merge conflict for '$MERGED':"
                describe_file "$local_mode" "local" "$LOCAL"
@@ -310,7 +310,7 @@ merge_file () {
        echo "Normal merge conflict for '$MERGED':"
        describe_file "$local_mode" "local" "$LOCAL"
        describe_file "$remote_mode" "remote" "$REMOTE"
-       if "$prompt" = true
+       if test "$guessed_merge_tool" = true || test "$prompt" = true
        then
                printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
                read ans || return 1
@@ -348,11 +348,16 @@ merge_file () {
        return 0
 }
 
-prompt=$(git config --bool mergetool.prompt || echo true)
+prompt=$(git config --bool mergetool.prompt)
+guessed_merge_tool=false
 
 while test $# != 0
 do
        case "$1" in
+       --tool-help=*)
+               TOOL_MODE=${1#--tool-help=}
+               show_tool_help
+               ;;
        --tool-help)
                show_tool_help
                ;;
@@ -404,9 +409,19 @@ prompt_after_failed_merge () {
        done
 }
 
+git_dir_init
+require_work_tree
+
 if test -z "$merge_tool"
 then
-       merge_tool=$(get_merge_tool "$merge_tool") || exit
+       # Check if a merge tool has been configured
+       merge_tool=$(get_configured_merge_tool)
+       # Try to guess an appropriate merge tool if no tool has been set.
+       if test -z "$merge_tool"
+       then
+               merge_tool=$(guess_merge_tool) || exit
+               guessed_merge_tool=true
+       fi
 fi
 merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
 merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"