How can I make git difftool to use gvim (gvimdiff)?

问题

There seems to have been a change in git which makes it no longer work correctly with gvim as the diff tool. Specifically, I always used to use the gvim -geometry flag to maximize the window. Now, I end up with one of the windows blank (empty/zero line file).

回答1:

OK, I found the answer. In order to work correctly, gvim must stay in the foreground and NOT fork a new process as usual. This is accomplished by using the "-f" or "--nofork" flag when starting gvim (or gvimdiff).

I have now setup the following alias which works:

alias gitdg='git difftool --noprompt --extcmd="gvim -d --nofork -geometry 220x80+2000+40" '

Please be careful to note the placement of single- vs. double-quotes to keep the zsh shell happy.

I used the gvim option "-geometry" to configure the diff windows to have 220 lines x 80 columns. The "+2000+40" means the upperleft corner of window to be offset of 2000 pixels horizontally and 80 pixels vertically from the top-left corner of all monitors, so the window appears on the right monitor of my 2-monitor setup. Try setting it to "-geometry 160x40+60+20" to see the effect of changes.

回答2:

On Windows Server 2012R2, adding the following to my .gitconfig worked for me as well. My experience was that the -d and -f were not necessary for my setup. Even though this is Windows, assure you use forward slashes '/' for the path information.

[alias]
    d = difftool
[diff]
    tool = gvimdiff
[difftool]
    prompt = false
[difftool "gvimdiff"]
    path = "C:/Program Files (x86)/Vim/vim81/gvim.exe"

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