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(define-module (text markup)
:use-module (hnh util)
:use-module (srfi srfi-1)
:use-module (srfi srfi-71)
:use-module (ice-9 match)
:use-module (ice-9 pretty-print)
:use-module (text util)
:use-module (text flow)
:use-module (texinfo string-utils)
:export (sxml->ansi-text))
;; Takes an HTML-like sxml coded tree, and produces a string with
;; appropriate spacing and ANSI-escapes for different tags.
(define (sxml->ansi-text tree)
((parse-tree ontree onleaf) tree))
(define (esc . effect)
(format #f "\x1b[~am"
(if (null? effect) ; NOCOV
""
(case (car effect) ; NOCOV
[(bold) 1]
[(italic) 3]
[(invert) 7]
[else (scm-error 'misc-error "esc"
"Unknown escape: ~s"
(car effect) #f)]))))
;; tag := (tag-name [(@ attributes ...)] body ...)
;; alist → tag → tag
(define (add-attributes args)
(match-lambda
[(name ('@ tagargs ...) body ...)
`(,name (@ ,@(assq-limit (assq-merge tagargs args)))
,@body)]
[(name body ...)
`(,name (@ ,@args) ,@body)]
[nonlist nonlist]))
(define (get-attr args key default)
(aif (assoc-ref args key)
(car it) default))
(define (dt? x)
(and (list? x) (eq? 'dt (car x))))
(define (dd? x)
(and (list? x) (eq? 'dd (car x))))
;; NOTE Some tags can be given a `width' attribute. This is however not yet
;; fully supported.
(define* (ontree tag body optional: (args '()))
(case tag
[(*TOP* group block) (string-concatenate
(map (compose sxml->ansi-text (add-attributes args))
body))]
[(header) (sxml->ansi-text `(group (center (@ ,@args) (b ,@body)) (br)))]
[(center) (center-string (string-concatenate (map sxml->ansi-text body))
(get-attr args 'width 70))]
[(p) (string-append (string-join (flow-text (string-concatenate (map sxml->ansi-text body))
width: (get-attr args 'width 70))
"\n")
(if (assoc-ref args 'inline) "" "\n\n")
)]
[(b) (string-append (esc 'bold) (string-concatenate (map sxml->ansi-text body)) (esc))]
[(i em) (string-append (esc 'italic) (string-concatenate (map sxml->ansi-text body)) (esc))]
;; NOOP, but for future use.
[(code) (string-concatenate (map sxml->ansi-text body))]
[(blockquote) (string-concatenate
(map (lambda (line) (sxml->ansi-text `(group (ws (@ (minwidth 4))) ,line (br))))
(flow-text
(string-concatenate (map sxml->ansi-text body))
;; TODO shouldn't this use (- width 4)?
width: 66)))]
[(ws) (make-string (aif (assoc-ref args 'minwidth)
(car it) 1)
#\space)]
[(br) "\n"]
;; TODO width
[(hr) (string-append " " (make-string 60 #\─) " \n")]
[(dl)
(let* ((body
(map (lambda (el)
(cond ((dt? el) (list 'dt (sxml->ansi-text el)))
((dd? el) el)
(else (scm-error 'wrong-type-arg "ontree"
"Only <dt/> and <dd/> are valid children of <dl/>, got ~s"
(list el)
#f))))
body))
(dt-width (apply max 0 (map (compose true-string-length cadr) (filter dt? body)))))
(let loop ((remaining body)
(dts '()))
(if (null? remaining)
(string-join
(map string-append
(append (map (lambda (x) (true-string-pad x dt-width))
(reverse dts)))
(make-list (length dts) " │ "))
"\n" 'suffix)
(let ((el (car remaining)))
(cond ((dt? el) (loop (cdr remaining) (cons (cadr el) dts)))
((dd? el)
(let ((content (lines
(sxml->ansi-text `(block (@ (width ,(- 70 dt-width 3)))
,el)))))
(string-append
(unlines
(map string-append
(append (map (lambda (x) (true-string-pad x dt-width))
(reverse dts))
(make-list (max 0 (- (length content)
(length dts)))
(make-string dt-width #\space)))
(make-list (max (length content) (length dts)) " │ ")
(append content (make-list (max 0 (- (length dts) (length content)))
""))))
"\n"
(loop (cdr remaining) '()))))
(else (scm-error 'misc-error "on-tree" "Unexpected: ~s~%" (list (car remaining)) #f )))))))]
[(dt) (string-concatenate (map (compose sxml->ansi-text (add-attributes args))
body))]
[(dd)
(string-concatenate
(map (compose sxml->ansi-text (add-attributes args))
body))]
[(scheme)
(string-concatenate
(map (lambda (form)
(string-trim-both
(with-output-to-string
(lambda () (pretty-print form width: (aif (assoc-ref args 'width) (car it) 70))))))
body))]
[else (string-append (esc 'bold) "??"
"`"
(esc 'invert)
(with-output-to-string
(lambda () (write body)))
(esc) "'")]))
(define (onleaf leaf)
(format #f "~a" leaf))
(define (parse-tree tree-callback leaf-callback)
(match-lambda
[(tag ('@ args ...) body ...)
(tree-callback tag body args)]
[(tag body ...)
(tree-callback tag body)]
[() ""]
[(any ...) (map leaf-callback any)]
[any (leaf-callback any)]))
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