git-config-mergetools

[merge]
        tool = p4merge
[diff]
        tool = p4merge
        guitool = vimdiff
[difftool "p4merge"]
        cmd = \"~/difftool.bat\" $LOCAL $REMOTE
[difftool]
        prompt = false
[mergetool "p4merge"]
        cmd = \"~/mergetool.bat\" $BASE $LOCAL $REMOTE $MERGED
[mergetool]
        prompt = false
        trustExitCode = false
        keepBackup = false