Eskil

    cd $dir
    catch {exec git add $tail}
    cd $old
}

# Get a GIT patch
proc eskil::rev::GIT::getPatch {revs {files {}}} {
    set cmd [list exec git diff {*}$files]
    # No rev support yet
    set cmd [list exec git diff -p]
    if {[llength $revs] == 0} {
        # Always default to HEAD to see changes regardless of index
        lappend cmd HEAD
    } else {
        foreach rev $revs {
            lappend cmd $rev
        }
    }
    lappend cmd "--" {*}$files

    if {[catch {eval $cmd} res]} {
        tk_messageBox -icon error -title "GIT error" -message $res
        return ""
    }
    return $res
}