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# http://elm-lang.org
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
# Detection
# ‾‾‾‾‾‾‾‾‾
hook global BufCreate .*[.](elm) %{
set-option buffer filetype elm
}
# Initialization
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
hook global WinSetOption filetype=elm %{
require-module elm
hook window ModeChange pop:insert:.* -group elm-trim-indent elm-trim-indent
hook window InsertChar \n -group elm-insert elm-insert-on-new-line
hook window InsertChar \n -group elm-indent elm-indent-on-new-line
hook -once -always window WinSetOption filetype=.* %{ remove-hooks window elm-.+ }
}
hook -group elm-highlight global WinSetOption filetype=elm %{
add-highlighter window/elm ref elm
hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/elm }
}
provide-module elm %[
# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾
add-highlighter shared/elm regions
add-highlighter shared/elm/code default-region group
add-highlighter shared/elm/multiline_string region '"""' '"""' fill string
add-highlighter shared/elm/string region '"' (?<!\\)(\\\\)*" fill string
add-highlighter shared/elm/line_comment region (--) $ fill comment
add-highlighter shared/elm/comment region -recurse \{- \{- -\} fill comment
add-highlighter shared/elm/code/ regex \b[A-Z]\w*\b 0:type
add-highlighter shared/elm/code/ regex \b[a-z]\w*\b 0:variable
add-highlighter shared/elm/code/ regex ^[a-z]\w*\b 0:function
add-highlighter shared/elm/code/ regex "-?\b[0-9]*\.?[0-9]+" 0:value
add-highlighter shared/elm/code/ regex \B[-+<>!@#$%^&*=:/\\|]+\B 0:operator
add-highlighter shared/elm/code/ regex \b(import|exposing|as|module|port)\b 0:meta
add-highlighter shared/elm/code/ regex \b(type|alias|if|then|else|case|of|let|in|infix|_)\b) 0:keyword
add-highlighter shared/elm/code/ regex (?<![-+<>!@#$%^&*=:/\\|])(->|:|=|\|)(?![-+<>!@#$%^&*=:/\\|]) 0:keyword
# Commands
# ‾‾‾‾‾‾‾‾
# http://elm-lang.org/docs/style-guide
define-command -hidden elm-trim-indent %{
# remove trailing white spaces
try %{ execute-keys -draft -itersel x s \h+$ <ret> d }
}
define-command -hidden elm-indent-after "
execute-keys -draft <semicolon> k x <a-k> ^\\h*if|[=(]$|\\b(case\\h+[\\w']+\\h+of|let|in)$|(\\{\\h+\\w+|\\w+\\h+->)$ <ret> j <a-gt>
"
define-command -hidden elm-insert-on-new-line %{
evaluate-commands -draft -itersel %{
# copy -- comments prefix and following white spaces
try %{ execute-keys -draft k x s ^\h*\K--\h* <ret> y gh j P }
}
}
define-command -hidden elm-indent-on-new-line %{
evaluate-commands -draft -itersel %{
# preserve previous line indent
try %{ execute-keys -draft <semicolon> K <a-&> }
# align to first clause
try %{ execute-keys -draft <semicolon> k x X s ^\h*(if|then|else)?\h*(([\w']+\h+)+=)?\h*(case\h+[\w']+\h+of|let)\h+\K.* <ret> s \A|.\z <ret> & }
# filter previous line
try %{ execute-keys -draft k : elm-trim-indent <ret> }
# indent after lines beginning with condition or ending with expression or =(
try %{ elm-indent-after }
}
}
]
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