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From: Denton Liu <liu.denton@gmail.com>
To: Jeff Hostetler <git@jeffhostetler.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	David Aguilar <davvid@gmail.com>
Subject: Re: [PATCH 5/5] difftool: fallback on merge.guitool
Date: Mon, 22 Apr 2019 11:33:56 -0700	[thread overview]
Message-ID: <20190422183356.GA6730@dev-l> (raw)
In-Reply-To: <2a521a5c-4b5d-57aa-1e91-d4ec9b190fb7@jeffhostetler.com>

Hi Jeff,

On Mon, Apr 22, 2019 at 02:18:36PM -0400, Jeff Hostetler wrote:
> 
> 
> On 4/22/2019 1:07 AM, Denton Liu wrote:
> >In git-difftool.txt, it says
> >
> >	'git difftool' falls back to 'git mergetool' config variables when the
> >	difftool equivalents have not been defined.
> >
> >However, when `diff.guitool` is missing, it doesn't fallback to
> >anything. Make git-difftool fallback to `merge.guitool` when `diff.guitool` is
> >missing.
> >
> 
> Is this a well-defined operation?

I believe this is a yes.

> 
> I mean, we're assuming here that a 3-way gui merge tool (that probably
> expects 3 input pathnames and maybe a 4th merge-result pathname (and
> associated titles and etc)) can function sanely when only given the
> pair that a diff would have.
> 
> That is, we're assuming that the selected merge tool has a 2-way diff
> mode and that the command line args for the 2- and 3-way views are
> compatible.

If I read the code correctly, it seems like the only tool that is
strictly "merge-only" is tortoisemerge. In mergetools/tortoisemerge, we
have

	can_diff () {
		return 1
	}

which means it will refuse to run as a difftool.

In the case where it fails like this, it'll loudly complain to the user,
which'll give them a chance to fix their config. I believe that this is
desired behaviour and the patch adds on top of that.

Thanks,

Denton

> 
> Just a thought
> Jeff
> 
> 

  reply	other threads:[~2019-04-22 18:34 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-22  5:07 [PATCH 0/5] difftool and mergetool improvements Denton Liu
2019-04-22  5:07 ` [PATCH 1/5] t7610: add mergetool --gui tests Denton Liu
2019-04-22  5:07 ` [PATCH 2/5] mergetool: use get_merge_tool function Denton Liu
2019-04-22  7:07   ` Eric Sunshine
2019-04-22  8:35     ` Denton Liu
2019-04-22  5:07 ` [PATCH 3/5] mergetool: fallback to tool when guitool unavailable Denton Liu
2019-04-22  5:07 ` [PATCH 4/5] difftool: make --gui, --tool and --extcmd exclusive Denton Liu
2019-04-22  7:03   ` Eric Sunshine
2019-04-22  5:07 ` [PATCH 5/5] difftool: fallback on merge.guitool Denton Liu
2019-04-22 18:18   ` Jeff Hostetler
2019-04-22 18:33     ` Denton Liu [this message]
2019-04-23  8:53 ` [PATCH v2 0/5] difftool and mergetool improvements Denton Liu
2019-04-23  8:53   ` [PATCH v2 1/5] t7610: add mergetool --gui tests Denton Liu
2019-04-24  7:07     ` Junio C Hamano
2019-04-23  8:54   ` [PATCH v2 2/5] mergetool: use get_merge_tool_guessed function Denton Liu
2019-04-24  7:27     ` Junio C Hamano
2019-04-23  8:54   ` [PATCH v2 3/5] mergetool: fallback to tool when guitool unavailable Denton Liu
2019-04-23  8:54   ` [PATCH v2 4/5] difftool: make --gui, --tool and --extcmd mutually exclusive Denton Liu
2019-04-23  8:54   ` [PATCH v2 5/5] difftool: fallback on merge.guitool Denton Liu
2019-04-24 22:46   ` [PATCH v3 0/6] difftool and mergetool improvements Denton Liu
2019-04-24 22:46     ` [PATCH v3 1/6] t7610: unsuppress output Denton Liu
2019-04-25  2:31       ` Junio C Hamano
2019-04-24 22:46     ` [PATCH v3 2/6] t7610: add mergetool --gui tests Denton Liu
2019-04-24 22:47     ` [PATCH v3 3/6] mergetool: use get_merge_tool function Denton Liu
2019-04-25  2:36       ` Junio C Hamano
2019-04-24 22:47     ` [PATCH v3 4/6] mergetool: fallback to tool when guitool unavailable Denton Liu
2019-04-25  3:02       ` Junio C Hamano
2019-04-25  5:16         ` Denton Liu
2019-04-24 22:47     ` [PATCH v3 5/6] difftool: make --gui, --tool and --extcmd mutually exclusive Denton Liu
2019-04-24 22:47     ` [PATCH v3 6/6] difftool: fallback on merge.guitool Denton Liu
2019-04-25  3:10       ` Junio C Hamano
2019-04-25  9:54     ` [PATCH v4 0/6] difftool and mergetool improvements Denton Liu
2019-04-25  9:54       ` [PATCH v4 1/6] t7610: unsuppress output Denton Liu
2019-04-25  9:54       ` [PATCH v4 2/6] t7610: add mergetool --gui tests Denton Liu
2019-04-25  9:54       ` [PATCH v4 3/6] mergetool: use get_merge_tool function Denton Liu
2019-04-28 23:52         ` David Aguilar
2019-04-25  9:54       ` [PATCH v4 4/6] mergetool: fallback to tool when guitool unavailable Denton Liu
2019-04-28 23:56         ` David Aguilar
2019-04-25  9:54       ` [PATCH v4 5/6] difftool: make --gui, --tool and --extcmd mutually exclusive Denton Liu
2019-04-25  9:54       ` [PATCH v4 6/6] difftool: fallback on merge.guitool Denton Liu
2019-04-29  6:20       ` [PATCH v5 0/7] difftool and mergetool improvements Denton Liu
2019-04-29  6:21         ` [PATCH v5 1/7] t7610: unsuppress output Denton Liu
2019-04-29  6:21         ` [PATCH v5 2/7] t7610: add mergetool --gui tests Denton Liu
2019-04-29  6:21         ` [PATCH v5 3/7] mergetool: use get_merge_tool function Denton Liu
2019-04-29  6:21         ` [PATCH v5 4/7] mergetool--lib: create gui_mode function Denton Liu
2019-04-29  6:21         ` [PATCH v5 5/7] mergetool: fallback to tool when guitool unavailable Denton Liu
2019-04-29  6:21         ` [PATCH v5 6/7] difftool: make --gui, --tool and --extcmd mutually exclusive Denton Liu
2019-04-29  6:21         ` [PATCH v5 7/7] difftool: fallback on merge.guitool Denton Liu

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