Subject: Re: [PATCH] git-gui.sh: support Tcl 8.4

From: Jens Lehmann <[email-masked]>
Date: Wed, 07 Jan 2015 08:35:32 +0100

Am 07.01.2015 um 01:02 schrieb Junio C Hamano:
> ^"Kyle J. McKay" <[email-masked]> writes:
>> I can't find anything in that thread about why vsatisfies was
>> preferred over vcompare other than the obvious that the vsatisfies
>> version is only a 1-character change.  And that would be more than
>> enough except that Tcl 8.4 doesn't support the trailing '-' vsatisfies
>> syntax.
>
> Yeah, I fully agree with that observation.

Having rather corroded TCL-knowledge myself it was Pat's comment in

    http://thread.gmane.org/gmane.comp.version-control.git/247511/focus=249464

that made me change the patch to use the smaller change of adding
the trailing '-' after vsatisfies instead of using vcompare with
a trailing ">= 0" in v2.

>>> * Would it be a good idea to update the places $gmane/248895 points
>>>    out?  It is clearly outside the scope of this fix, but we may
>>>    want to do so while our mind is on the "how do we check required
>>>    version?" in a separate patch.
>>
>> Makes sense to me, but my Tcl knowledge isn't up to making those
>> changes as the code's a bit different.  I have to paraphrase Chris's
>> message here by saying that I guess those checks are correct if not
>> consistent with the others.

When I looked at it back then I was convinced these checks are ok
and should stay as they are to support ancient Git versions (and
they do not use vsatisfies either).

> OK, let's ask Pat (cc'ed) to apply your version as-is without
> touching these 1.5.3 references.  I do not take patches to git-gui
> directly to my tree.

It's an ack from me on the change below as that was what I came up
with and tested successfully before Pat suggested to just add the '-'.

> -- >8 --
> From: "Kyle J. McKay" <[email-masked]>
> Date: Tue,  6 Jan 2015 02:41:21 -0800
>
> Tcl 8.5 introduced an extended vsatisfies syntax that is not
> supported by Tcl 8.4.
>
> Since only Tcl 8.4 is required this presents a problem.
>
> The extended syntax was used starting with Git 2.0.0 in commit
> b3f0c5c0 (git-gui: tolerate major version changes when comparing the
> git version, 2014-05-17), so that a major version change would still
> satisfy the condition.
>
> However, what we really want is just a basic version compare, so use
> vcompare instead to restore compatibility with Tcl 8.4.
>
> Signed-off-by: Kyle J. McKay <[email-masked]>
> Signed-off-by: Junio C Hamano <[email-masked]>
> ---
>   git-gui.sh | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/git-gui.sh b/git-gui.sh
> index b186329d..a1a23b56 100755
> --- a/git-gui/git-gui.sh
> +++ b/git-gui/git-gui.sh
> @@ -1283,7 +1283,7 @@ load_config 0
>   apply_config
>
>   # v1.7.0 introduced --show-toplevel to return the canonical work-tree
> -if {[package vsatisfies $_git_version 1.7.0-]} {
> +if {[package vcompare $_git_version 1.7.0] >= 0} {
>   	if { [is_Cygwin] } {
>   		catch {set _gitworktree [exec cygpath --windows [git rev-parse --show-toplevel]]}
>   	} else {
> @@ -1539,7 +1539,7 @@ proc rescan_stage2 {fd after} {
>   		close $fd
>   	}
>
> -	if {[package vsatisfies $::_git_version 1.6.3-]} {
> +	if {[package vcompare $::_git_version 1.6.3] >= 0} {
>   		set ls_others [list --exclude-standard]
>   	} else {
>   		set ls_others [list --exclude-per-directory=.gitignore]
>