# http://sass-lang.com
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾

# Detection
# ‾‾‾‾‾‾‾‾‾

hook global BufCreate .*[.](sass) %{
    set-option buffer filetype sass
}

hook -once global BufSetOption filetype=sass %{
    require-module sass
}

provide-module sass %{

# Highlighters
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add-highlighter shared/sass regions
add-highlighter shared/sass/code default-region group
add-highlighter shared/sass/single_string  region '"' (?<!\\)(\\\\)*" fill string
add-highlighter shared/sass/double_string  region "'" "'"             fill string
add-highlighter shared/sass/comment        region '/' '$'             fill comment

add-highlighter shared/sass/code/ regex [*]|[#.][A-Za-z][A-Za-z0-9_-]* 0:variable
add-highlighter shared/sass/code/ regex &|@[A-Za-z][A-Za-z0-9_-]* 0:meta
add-highlighter shared/sass/code/ regex (#[0-9A-Fa-f]+)|((\d*\.)?\d+(em|px)) 0:value
add-highlighter shared/sass/code/ regex ([A-Za-z][A-Za-z0-9_-]*)\h*: 1:keyword
add-highlighter shared/sass/code/ regex :(before|after) 0:attribute
add-highlighter shared/sass/code/ regex !important 0:keyword

# Commands
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define-command -hidden sass-trim-indent %{
    # remove trailing white spaces
    try %{ execute-keys -draft -itersel <a-x> s \h+$ <ret> d }
}

define-command -hidden sass-indent-on-new-line %{
    evaluate-commands -draft -itersel %{
        # copy '/' comment prefix and following white spaces
        try %{ execute-keys -draft k <a-x> s ^\h*\K/\h* <ret> y gh j P }
        # preserve previous line indent
        try %{ execute-keys -draft \; K <a-&> }
        # filter previous line
        try %{ execute-keys -draft k : sass-trim-indent <ret> }
        # avoid indent after properties and comments
        try %{ execute-keys -draft k <a-x> <a-K> [:/] <ret> j <a-gt> }
    }
}

# Initialization
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hook -group sass-highlight global WinSetOption filetype=sass %{
    add-highlighter window/sass ref sass
    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/sass }
}

hook global WinSetOption filetype=sass %{
    hook window ModeChange insert:.* -group sass-trim-indent  sass-trim-indent
    hook window InsertChar \n -group sass-indent sass-indent-on-new-line
    set-option buffer extra_word_chars '_' '-'

    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window sass-.+ }
}

}