using other merge and diff tools

If you've installed TortoiseGit, you can use the right click options to work with files. When inside Cygwin, you have the ability to call other programs too.

Edit your ~/.gitconfig with the following (adjust path if necessary):

[merge]
	tool = tortoise
[mergetool "tortoise"]
	cmd = \"c:/Progra~1/TortoiseGit/bin/TortoiseMerge.exe\" /base:\"$BASE\" /theirs:\"$REMOTE\" /mine:\"$LOCAL\" /merged:\"$MERGED\"

Now when you need to resolve merge conflicts, type this:

git mergetool

Each conflict will open in TortoiseMerge

You can run git diff in an external editor, and/or use git difftool to run the external editor:

.gitconfig

[diff]
	tool = winmerge
	#this runs git diff in external tool
	#external = /cygdrive/h/git-diff-wrapper.sh
[difftool "winmerge"]
	cmd = /cygdrive/h/git-difftool-wrapper.sh \"$LOCAL\" \"$REMOTE\"

git-diff-wrapper.sh

#!/bin/sh
"C:/Program Files/WinMerge/WinMergeU.exe" -e -ub `cygpath -w $2` `cygpath -w $5` | cat

git-difftool-wrapper.sh

#!/bin/sh
"C:/Program Files/WinMerge/WinMergeU.exe" -e -ub `cygpath -w $1` `cygpath -w $2` | cat

• http://stackoverflow.com/questions/255202/how-do-i-view-git-diff-output-with-visual-diff-program