# http://kakoune.org
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾

# Detection
# ‾‾‾‾‾‾‾‾‾

hook global BufCreate (.*/)?(kakrc|.*.kak) %{
    set-option buffer filetype kak
}

# Highlighters & Completion
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾

add-highlighter shared/ regions -default code kakrc \
    comment (^|\h)\K# $ '' \
    double_string %{(^|\h)\K"} %{(?<!\\)(\\\\)*"} '' \
    single_string %{(^|\h)\K'} %{(?<!\\)(\\\\)*'} '' \
    shell '(^|\h)\K%?%sh\{' '\}' '\{' \
    shell '(^|\h)\K%?%sh\(' '\)' '\(' \
    shell '(^|\h)\K%?%sh\[' '\]' '\[' \
    shell '(^|\h)\K%?%sh<'  '>'  '<' \
    shell '(^|\h)\K-shell-(completion|candidates)\h+%\{' '\}' '\{' \
    shell '(^|\h)\K-shell-(completion|candidates)\h+%\(' '\)' '\(' \
    shell '(^|\h)\K-shell-(completion|candidates)\h+%\[' '\]' '\[' \
    shell '(^|\h)\K-shell-(completion|candidates)\h+%<'  '>'  '<'

evaluate-commands %sh{
    # Grammar
    keywords="edit write write-all kill quit write-quit write-all-quit map unmap alias unalias
              buffer buffer-next buffer-previous delete-buffer add-highlighter remove-highlighter
              hook remove-hooks define-command echo debug source try fail nop
              set-option unset-option update-option declare-option execute-keys evaluate-commands
              prompt menu on-key info set-face unset-face rename-client set-register select
              change-directory rename-session colorscheme declare-user-mode enter-user-mode"
    attributes="global buffer window current
                normal insert menu prompt goto view user object
                number_lines show_matching show_whitespaces fill regex dynregex group flag_lines
                ranges line column wrap ref regions replace-ranges"
    types="int bool str regex int-list str-list completions line-specs range-specs"
    values="default black red green yellow blue magenta cyan white yes no false true"

    join() { printf "%s" "$1" | tr -s ' \n' "$2"; }

    # Add the language's grammar to the static completion list
    printf '%s\n' "hook global WinSetOption filetype=kak %{
        set-option window static_words '$(join "${keywords}:${attributes}:${types}:${values}" ':')'
        set-option -- window extra_word_chars '-'
    }"

    # Highlight keywords (which are always surrounded by whitespace)
    printf '%s\n' "add-highlighter shared/kakrc/code regex (?:\s|\A)\K($(join "${keywords}" '|'))(?:(?=\s)|\z) 0:keyword
                   add-highlighter shared/kakrc/code regex (?:\s|\A)\K($(join "${attributes}" '|'))(?:(?=\s)|\z) 0:attribute
                   add-highlighter shared/kakrc/code regex (?:\s|\A)\K($(join "${types}" '|'))(?:(?=\s)|\z) 0:type
                   add-highlighter shared/kakrc/code regex (?:\s|\A)\K($(join "${values}" '|'))(?:(?=\s)|\z) 0:value"
}

add-highlighter shared/kakrc/code regex \brgb:[0-9a-fA-F]{6}\b 0:value

add-highlighter shared/kakrc/double_string fill string
add-highlighter shared/kakrc/single_string fill string
add-highlighter shared/kakrc/comment fill comment
add-highlighter shared/kakrc/shell ref sh

# Commands
# ‾‾‾‾‾‾‾‾

define-command -hidden kak-indent-on-new-line %{
    evaluate-commands -draft -itersel %{
        # copy '#' comment prefix and following white spaces
        try %{ execute-keys -draft k <a-x> s ^\h*#\h* <ret> y jgh P }
        # preserve previous line indent
        try %{ execute-keys -draft \; K <a-&> }
        # cleanup trailing whitespaces from previous line
        try %{ execute-keys -draft k <a-x> s \h+$ <ret> d }
        # indent after line ending with %[\W\S]
        try %{ execute-keys -draft k <a-x> <a-k> \%[\W\S]$ <ret> j <a-gt> }
    }
}

# Initialization
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hook -group kak-highlight global WinSetOption filetype=kak %{ add-highlighter window ref kakrc }

hook global WinSetOption filetype=kak %{
    hook window InsertChar \n -group kak-indent kak-indent-on-new-line
    # cleanup trailing whitespaces on current line insert end
    hook window ModeChange insert:.* -group kak-indent %{ try %{ execute-keys -draft \; <a-x> s ^\h+$ <ret> d } }
    set-option buffer extra_word_chars '-'
}

hook -group kak-highlight global WinSetOption filetype=(?!kak).* %{ remove-highlighter window/kakrc }
hook global WinSetOption filetype=(?!kak).* %{ remove-hooks window kak-indent }