Re: [PATCH v2] Detect if kdiff3 supports '--' and do not supply it if not supported

[Junio C Hamano <gitster@pobox.com>]

Patrick Higgins <patrick.higgins@cexp.com> writes:

> kdiff3 can be compiled with Qt only or with KDE support. If compiled with
> Qt only, it does not support '--' and mergetool fails silently.
>
> Signed-off-by: Patrick Higgins <patrick.higgins@cexp.com>
> ---
>  git-mergetool.sh |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/git-mergetool.sh b/git-mergetool.sh
> index fcdec4a..85ce004 100755
> --- a/git-mergetool.sh
> +++ b/git-mergetool.sh
> @@ -181,12 +181,19 @@ merge_file () {
>  
>      case "$merge_tool" in
>  	kdiff3)
> +	    "$merge_tool_path" --auto -o /dev/null -- /dev/null /dev/null
> +	    if test $? -ne 0; then
> +		double_dash=""
> +	    else
> +		double_dash="--"
> +	    fi
> +
>  	    if base_present ; then
>  		("$merge_tool_path" --auto --L1 "$MERGED (Base)" --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" \
> -		    -o "$MERGED" -- "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
> +		    -o "$MERGED" $double_dash "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
>  	    else
>  		("$merge_tool_path" --auto --L1 "$MERGED (Local)" --L2 "$MERGED (Remote)" \
> -		    -o "$MERGED" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
> +		    -o "$MERGED" $double_dash "$LOCAL" "$REMOTE" > /dev/null 2>&1)
>  	    fi
>  	    status=$?
>  	    ;;

Now, when the name of the merged file begins with a dash (or dash-dash),
what does kdiff3 without KDE do?

I am wondering if it would be simpler and more robust if we did something
like this, which would let us get rid of double-dash from many places...

 git-mergetool.sh |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/git-mergetool.sh b/git-mergetool.sh
index fcdec4a..3d9833e 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -141,10 +141,10 @@ merge_file () {
     fi
 
     ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
-    BACKUP="$MERGED.BACKUP.$ext"
-    LOCAL="$MERGED.LOCAL.$ext"
-    REMOTE="$MERGED.REMOTE.$ext"
-    BASE="$MERGED.BASE.$ext"
+    BACKUP="./$MERGED.BACKUP.$ext"
+    LOCAL="./$MERGED.LOCAL.$ext"
+    REMOTE="./$MERGED.REMOTE.$ext"
+    BASE="./$MERGED.BASE.$ext"
 
     mv -- "$MERGED" "$BACKUP"
     cp -- "$BACKUP" "$MERGED"