code step throughs — a format for presenting lines of code in a beautiful way

presentation.cst

repo: https://github.com/elm-eug/live-polls
show: /blob/master/src/Poll.elm#L18-L20
emph: L18
emph: L19
show: /blob/master/src/Poll.elm#L29-L43
emph: L29-L32
emph: L41,L43
show: /blob/develop/src/Main.elm#L23-L26
emph: L24
emph: L25
emph: L26
done: Thanks for watching

repo specifies what repository you are pulling from, maybe not necessary if you are pulling code examples from multiple places
show specifies what code block is on screen
emph specifies which lines to emphasize
done would be a string that you could put as the last slide

show must come before emph and emph must only emphasize lines in the range from show.

- means "through" and , means "and". So emph: L29-L32 means emphasize lines 29-32. and emph: L41,L43 means emphasize lines 41 and 43.

Maybe the L could be left off, maybe repo and done could be dropped in favor of having a URL at each show block.

Maybe this could work locally if you specify localhost and it serves up some files.