On 2024-10-02, flyingosprey wrote:
> On Windows, I ran
>
> git config --global --replace-all merge.tool gvimdiff
> git config --global --replace-all mergetool.gvimdiff.path "C:/Program
> Files/Vim
> /vim90/gvim.exe"
> git config --global --replace-all mergetool.gvimdiff.trustExitCode false
> git config --global --replace-all merge.conflictstyle diff3
>
> to set gvim as git mergetool.
>
> I want to set a different color when git merge. I found
>
> if &diff
> colorscheme codedark
> endif
>
> does not work because when git merge starts, &diff is 0.
>
> Questions: In .vimrc, how to tell if gvim is under git 3way merge or not?
>
> Thanks for your suggestion.
The only way I use git on Windows is from Cygwin or from Git for
Windows, so these comments apply to those environments.
I'm surprised that "if &diff" doesn't work. In my ~/.gitconfig, the
vimdiff mergetool is this:
cmd = "vim -d -c '4wincmd w | wincmd J | wincmd =' $LOCAL $BASE $REMOTE
$MERGED"
The -d option sets &diff before .vimrc is sourced.
A few ideas come to mind:
1. After git opens gvim, execute
:echo $GIT<tab>
to complete all the environment variables in gvim's environment
that begin with "GIT".
Alternatively, shell out, then look for those variable from the
shell, e.g.,
:sh
$ env | grep GIT
See if any of those variable names or values are unique to the
merge command. If some are, then test their existence and/or
values in your .vimrc.
2. Wait to test the value of &diff until gvim is finished opening
files, e.g.,
autocmd VimEnter if &diff | colorscheme codedark | endif
That has the problem that it will set your colorscheme for any
vimdiff command.
3. Expand the VimEnter autocommand above to either count the number
of windows (winnr("$")) and check that the number is 4, or
traverse the open windows and check that &diff is set in all of
them.
4. Examine the v:argv variable and look for a pattern in the
arguments that might be unique to the git merge command.
HTH,
Gary
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