syn region gitLg start=/\%(^[|\/\\_ ]*\*[|\/\\_ ]\{-\} \%(\x\{4,\}\)\)\@=/ end=/$/ contains=@NoSpell,gitLgHash,gitLgEnd
syn match gitLgHash /\<\x\{7,\}\>/ contained nextgroup=gitLgDecorate skipwhite
syn match gitLgDecorate /([^)]*)/ contained
syn match gitLgEnd /([^)]*) <[^>]*>$/ contains=gitLgAuthor,gitLgDate
syn match gitLgDate /([^)]*)/ contained
syn match gitLgAuthor /<[^>]*>/ contained

hi def link gitLgHash gitHash
hi def link gitLgAuthor gitIdentity
hi def link gitLgDate gitDate
hi def link gitLgDecorate gitReference