The diff tool in Visual Studio when using the Git Plugin

Steps :

1. Install Winmerge with "WinMerge added to your PATH environment variable", you have to select the check box during winmerge installation.

2. Microsoft GIT provider plugin should be installed in visual studio 2013.

3. Go to user git config, generally in "C:\Users\USERNAME\.gitconfig"

4. Add the following lines or update according to parameters inside .gitconfig

**

[diff]
    tool = winmerge
[difftool "winmerge"]
  cmd = winmergeu.exe -e -ub -x -wl -u -maximise -dl "base" -dr "mine" \"$LOCAL\" \"$REMOTE\"
[difftool]
  prompt = false

**

Now from Visual studio if you do "Compare with Unmodified..." on a file winmerge should open up automatically.

You have to change your local .gitconfig, rather than make the change through Visual Studio as you would with TFS

https://gist.github.com/mkchandler/2377564

Add the following to your global .gitconfig file:

[diff]
    tool = diffmerge
[difftool "diffmerge"]
    cmd = \"C:\\Program Files\\SourceGear\\Common\\DiffMerge\\sgdm.exe\" \"$LOCAL\" \"$REMOTE\"
[merge]
    tool = diffmerge
[mergetool "diffmerge"]
    cmd = \"C:\\Program Files\\SourceGear\\Common\\DiffMerge\\sgdm.exe\" -merge -result=\"$PWD/$MERGED\" \"$PWD/$LOCAL\" \"$PWD/$BASE\" \"$PWD/$REMOTE\"
    trustExitCode = true
[mergetool]
    keepBackup = false