# http://www.scheme-reports.org
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾

# require lisp.kak

# Detection
# ‾‾‾‾‾‾‾‾‾

hook global BufCreate (.*/)?(.*\.(scm|ss|sld)) %{
    set-option buffer filetype scheme
}

# Highlighters
# ‾‾‾‾‾‾‾‾‾‾‾‾

add-highlighter shared/scheme regions
add-highlighter shared/scheme/code default-region group

add-highlighter shared/scheme/string region '"' (?<!\\)(\\\\)*" fill string
add-highlighter shared/scheme/comment region ';' '$' fill comment
add-highlighter shared/scheme/comment-form region -recurse "\(" "#;\(" "\)" fill comment
add-highlighter shared/scheme/comment-block region "#\|" "\|#" fill comment
add-highlighter shared/scheme/quoted-form region -recurse "\(" "'\(" "\)" fill variable

add-highlighter shared/scheme/code/ regex (#t|#f) 0:value
add-highlighter shared/scheme/code/ regex \b[0-9]+\.[0-9]*\b 0:value

evaluate-commands %sh{

	# Primitive expressions that cannot be derived.
	keywords='define do let let* letrec if cond case and or begin lambda delay delay-force set!'

	# Macro expressions.
	meta="define-syntax let-syntax letrec-syntax syntax-rules syntax-case"

	# Basic operators.
	operators='* + - ... / < <= = => > >='

	# Procedures that create a base type and their predicates (for easier type checking)
	types="list vector bytevector cons string boolean? list? pair?
	vector? bytevector? string? char? complex? eof-object? input-port?
	null? number? output-port? procedure? symbol?"

	# R5RS available procedures
	builtins="abs acos angle append apply asin assoc assq assv atan
                caaaar caaadr caaar caadar caaddr caadr
            	caar cadaar cadadr cadar caddar cadddr caddr cadr
            	call-with-current-continuation call-with-input-file
            	call-with-output-file call-with-values car cdaaar cdaadr cdaar
            	cdadar cdaddr cdadr cdar cddaar cddadr cddar cdddar cddddr cdddr
            	cddr cdr ceiling char->integer char-alphabetic? char-ci<=?
            	char-ci<? char-ci=? char-ci>=? char-ci>? char-downcase
            	char-lower-case? char-numeric? char-ready? char-upcase
            	char-upper-case? char-whitespace? char<=? char<? char=?
            	char>=? char>?	close-input-port close-output-port  cons cos
            	current-input-port current-output-port denominator display
            	dynamic-wind else  eq? equal? eqv? eval even? exact->inexact
            	exact? exp expt floor for-each force gcd imag-part inexact->exact
            	inexact?  integer->char integer? interaction-environment lcm
            	length list list->string list->vector list-ref list-tail  load log
            	magnitude make-polar make-rectangular make-string make-vector
            	map max member memq memv min modulo negative? newline not
            	null-environment  number->string numerator odd? open-input-file
            	open-output-file or peek-char positive?  quasiquote quote quotient
            	rational? rationalize read read-char real-part real? remainder
            	reverse round scheme-report-environment set-car! set-cdr! sin
            	sqrt string->list string->number string->symbol string-append
            	string-ci<=? string-ci<? string-ci=? string-ci>=?
            	string-ci>? string-copy string-fill! string-length string-ref
            	string-set! string<=? string<? string=? string>=? string>?
            	substring symbol->string   tan truncate values vector
            	vector->list vector-fill! vector-length vector-ref vector-set!
            	with-input-from-file with-output-to-file write write-char zero?"

    join () { printf "%s" "$1" | tr -s ' \n\t' "$2"; }

    printf '%s\n' "hook global WinSetOption filetype=scheme %{
        	set-option window static_words '$(join "$keywords:$meta:$operators:$builtins" ':' )'
    }"

    exact_quote () {
		for symbol in "$@"
		do
			printf '\\Q%s\\E ' "$symbol"
		done
    }

    qkeys=$(join "$(exact_quote $keywords)" '|')
    qmeta=$(join "$(exact_quote $meta)" '|')
    qops=$(join "$(exact_quote "$operators")" '|')
    qbuiltins=$(join "$(exact_quote $builtins)" '|')
    qtypes=$(join "$(exact_quote $types)" '|')

	non_word_chars='[\s\(\)\[\]\{\};\|]'
	normal_identifiers='-!$%&\*\+\./:<=>\?\^_~a-zA-Z0-9'
	identifier_chars="[${normal_identifiers}][${normal_identifiers},#]*"

	add_highlighter () {
    	printf '%s\n' "add-highlighter shared/scheme/code/ regex \"$1\" $2"
	}

    add_highlighter "${non_word_chars}+(${qkeys})${non_word_chars}" "1:keyword"
    add_highlighter "${non_word_chars}+(${qmeta})${non_word_chars}" "1:meta"
    add_highlighter "${non_word_chars}+(${qops})${non_word_chars}" "1:operator"
    add_highlighter "${non_word_chars}+(${qbuiltins})${non_word_chars}" "1:builtin"
    add_highlighter "${non_word_chars}+('${identifier_chars})" "1:attribute"
    add_highlighter "${non_word_chars}+(${qtypes})${non_word_chars}" "1:type"
    add_highlighter "\(define\W+\(($identifier_chars)" "1:function"
    add_highlighter "\(define\W+($identifier_chars)\W+\(lambda" "1:function"
}

# Initialization
# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾

hook -group scheme-highlight global WinSetOption filetype=scheme %{
    add-highlighter window/scheme ref scheme
}

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

hook global WinSetOption filetype=scheme %{
    set-option buffer extra_word_chars '_' '-' '!' '%' '?' '<' '>' '='
    hook window InsertEnd  .* -group scheme-hooks  lisp-filter-around-selections
    hook window InsertChar \n -group scheme-indent lisp-indent-on-new-line
}

hook global WinSetOption filetype=(?!scheme).* %{
    remove-hooks window scheme-.+
}