Re: [PATCH v5 14/14] difftool/mergetool: refactor commands to use git-mergetool--lib

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

David Aguilar <davvid@gmail.com> writes:

> This consolidates the common functionality from git-mergetool and
> git-difftool--helper into a single git-mergetool--lib scriptlet.
>
> +guess_merge_tool () {
> +	tools="ecmerge"
> +	if merge_mode; then
> +		tools="tortoisemerge"
> +	else
> +		tools="kompare"
> +	fi

The first assignment of ecmerge seems a no-op.

> +	if test -n "$DISPLAY"; then
> +		if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
> +			tools="meld opendiff kdiff3 tkdiff xxdiff $tools \
> +				gvimdiff diffuse ecmerge"
> +		else
> +			tools="opendiff kdiff3 tkdiff xxdiff meld $tools \
> +				gvimdiff diffuse ecmerge"
> +		fi
> +	fi
> +	if echo "${VISUAL:-$EDITOR}" | grep emacs > /dev/null 2>&1; then
> +		# $EDITOR is emacs so add emerge as a candidate
> +		tools="$tools emerge vimdiff"
> +	elif echo "${VISUAL:-$EDITOR}" | grep vim > /dev/null 2>&1; then
> +		# $EDITOR is vim so add vimdiff as a candidate
> +		tools="$tools vimdiff emerge"
> +	else
> +		tools="$tools emerge vimdiff"
> +	fi
> +	tools="$(echo "$tools" | sed -e 's/ 	*/ /g')"
> +	echo >&2 "merge tool candidates: $tools"

Sorry, but I am not sure what this is doing.  Replace a SP followed by
zero or more HT with a single SP?  

Ahh, you are removing the HT in the indentation part?

I'd rather see the above written like this if that is the case:

> +	if test -n "$DISPLAY"; then
> +		if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
> +			tools="meld opendiff kdiff3 tkdiff xxdiff $tools"
> +		else
> +			tools="opendiff kdiff3 tkdiff xxdiff meld $tools"
> +		fi
> + 		tools="$tools gvimdiff diffuse ecmerge"
> +	fi

then you can lose the "echo | sed", no?