--tool=<tool>::
Use the merge resolution program specified by <tool>.
Valid merge tools are:
- kdiff3, tkdiff, meld, xxdiff, emerge, vimdiff, gvimdiff, ecmerge, and opendiff
+ kdiff3, tkdiff, meld, xxdiff, emerge, vimdiff, gvimdiff, ecmerge,
+ diffuse, tortoisemerge and opendiff
+
If a merge resolution program is not specified, 'git-mergetool'
will use the configuration variable `merge.tool`. If the