View differences of branches with meld?

Short & sweet:

git config --global diff.tool meld

This configures Git to use meld as the diff tool. (You don’t need to specify the command line arguments, support for meld is built into Git.)

Then, if you want a graphical diff instead of a textual one, you simply invoke git difftool instead of git diff (they both take the same arguments). In your case:

git difftool master..devel

Update: If you don’t want the one-file-at-a-time diff, but instead want to use meld’s “subdirectory” view with all the changes between the two branches, note the -d or --dir-diff option for git difftool. For example, when I’m on branch XYZ and I want to see what is different between this and branch ABC, I run this:

git difftool -d ABC

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