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" dockerfile.vim - Syntax highlighting for Dockerfiles

" Maintainer: Honza Pokorny <https://honza.ca>

" Version: 0.5

if exists("b:current_syntax")

finish

endif

let b:current_syntax = "dockerfile"

syntax case ignore

syntax match dockerfileKeyword /\v^\s*(ONBUILD\s+)?(ADD|ARG|CMD|COPY|ENTRYPOINT|ENV|EXPOSE|FROM|HEALTHCHECK|LABEL|MAINTAINER|RUN|SHELL|STOPSIGNAL|USER|VOLUME|WORKDIR)\s/

highlight link dockerfileKeyword Keyword

syntax region dockerfileString start=/\v"/ skip=/\v\\./ end=/\v"/

highlight link dockerfileString String

syntax match dockerfileComment "\v^\s*#.*$"

highlight link dockerfileComment Comment

set commentstring=#\ %s

" match "RUN", "CMD", and "ENTRYPOINT" lines, and parse them as shell

let s:current_syntax = b:current_syntax

unlet b:current_syntax

syntax include @SH syntax/sh.vim

let b:current_syntax = s:current_syntax

syntax region shLine matchgroup=dockerfileKeyword start=/\v^\s*(RUN|CMD|ENTRYPOINT)\s/ end=/\v$/ contains=@SH

" since @SH will handle "\" as part of the same line automatically, this "just works" for line continuation too, but with the caveat that it will highlight "RUN echo '" followed by a newline as if it were a block because the "'" is shell line continuation... not sure how to fix that just yet (TODO)