syntax match gitlogGraph      contained /^[*|\\\/_ ]*/
            \ nextgroup=gitlogHash
syntax match gitlogHash       contained /\<\x\{7,40\}\>/
            \ nextgroup=gitlogDate skipwhite
syntax match gitlogDate       contained /\<\d\{4}-\d\{2}-\d\{2}\>/
            \ nextgroup=gitlogAuthor skipwhite
syntax match gitlogAuthor     contained /{[^}]\+}/
            \ nextgroup=gitlogRef skipwhite
syntax match gitlogRef        contained /([^)]\+)/
syntax match gitlogLine
            \ /^[*|\\\/_ ]*\x\{7,40}\s\+\d\{4}-\d\{2}-\d\{2}\s\+{[^}]\+}.*/
            \ contains=gitlogGraph
syntax match gitlogGraphLine /^[*|\\\/_ ]\+$/
            \ contains=gitlogGraph

highlight default link gitlogGraph      Comment
highlight default link gitlogHash       Identifier
highlight default link gitlogDate       Number
highlight default link gitlogAuthor     String
highlight default link gitlogRef        Constant