racket-ansi/rmacs/buffer.rkt

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#lang racket/base
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(provide make-buffergroup
main-mark-type
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buffer?
make-buffer
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register-buffer!
lookup-buffer
file->buffer
buffer-rename!
buffer-reorder!
buffer-next
buffer-prev
buffer-pos
buffer-title
buffer-group
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buffer-size
buffer-move-to!
buffer-move-by!
buffer-mark!
buffer-clear-mark!
buffer-mark-pos
buffer-region-split
buffer-region
buffer-region-update!
call-with-excursion
buffer-search
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buffer-findf)
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(require "rope.rkt")
(require "search.rkt")
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(require "circular-list.rkt")
(require (only-in racket/string string-join))
(require (only-in racket/path normalize-path))
(require (only-in racket/file file->string))
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(define main-mark-type (mark-type "main" 'right))
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(struct buffergroup ([members #:mutable] ;; (CircularList Buffer)
) #:transparent)
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(struct buffer ([rope #:mutable]
[pos #:mutable]
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[title #:mutable]
[group #:mutable] ;; (Option BufferGroup)
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) #:transparent)
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(define (make-buffergroup)
(buffergroup circular-empty))
(define (make-buffer group ;; (Option BufferGroup)
title ;; String
#:initial-contents [initial-contents ""])
(register-buffer! group (buffer (string->rope initial-contents)
0
title
#f)))
(define (register-buffer! group buf)
(define old-group (buffer-group buf))
(when old-group
(set-buffergroup-members! old-group
(circular-list-remove buf (buffergroup-members old-group) eq?))
(set-buffer-group! buf #f))
(cond
[(not group) buf]
[(title->buffer* group (buffer-title buf)) #f]
[else
(set-buffer-group! buf group)
(set-buffergroup-members! group (circular-cons buf (buffergroup-members group)))
buf]))
(define (title->buffer* group title)
(and group
(circular-list-memf (lambda (b) (equal? (buffer-title b) title)) (buffergroup-members group))))
(define (buffer->buffer* group b)
(and group
(circular-list-memf (lambda (b1) (eq? b b1)) (buffergroup-members group))))
(define (lookup-buffer group title)
(cond [(title->buffer* group title) => circular-car] [else #f]))
(define (title-exists-in-group? group title)
(and (title->buffer* group title) #t))
;; (Option Group) Path -> String
(define (filename->unique-buffer-title group filename)
(define pieces (reverse (map path->string (explode-path filename))))
(define primary-piece (car pieces))
(define uniquifiers (cdr pieces))
(if (not group)
primary-piece
(let search ((used '()) (remaining uniquifiers))
(define candidate
(if (null? used)
primary-piece
(format "~a<~a>" primary-piece (string-join used "/"))))
(if (title-exists-in-group? group candidate)
(if (pair? remaining)
(search (cons (car remaining) used) (cdr remaining))
(let search ((counter 2))
(define candidate (format "~a<~a>" primary-piece counter))
(if (title-exists-in-group? group candidate)
(search (+ counter 1))
candidate)))
candidate))))
(define (file->buffer group filename)
(let* ((filename (normalize-path (simplify-path filename)))
(title (filename->unique-buffer-title group filename))
(b (make-buffer group title)))
(buffer-region-update! b
(lambda (_dontcare) (string->rope (file->string filename)))
#:point 0
#:mark (buffer-size b))))
(define (buffer-rename! b new-title)
(if (title-exists-in-group? (buffer-group b) new-title)
#f
(begin (set-buffer-title! b new-title)
b)))
(define (buffer-reorder! b)
;; Reorders b to the top of the group as a side-effect
(register-buffer! (buffer-group b) b))
(define (buffer-next b)
(cond [(buffer->buffer* (buffer-group b) b) => (compose circular-car circular-list-rotate-forward)]
[else #f]))
(define (buffer-prev b)
(cond [(buffer->buffer* (buffer-group b) b) => (compose circular-car circular-list-rotate-backward)]
[else #f]))
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(define (buffer-size buf) (rope-size (buffer-rope buf)))
(define (buffer-move-to! buf pos)
(set-buffer-pos! buf (max 0 (min (buffer-size buf) pos)))
(buffer-seek! buf pos))
(define (buffer-seek! buf pos)
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(buffer-lift rope-seek buf pos))
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(define (buffer-move-by! buf delta)
(buffer-move-to! buf (+ (buffer-pos buf) delta)))
(define (buffer-mark! buf [mtype main-mark-type] #:position [pos (buffer-pos buf)] #:value [value #t])
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(buffer-lift replace-mark buf mtype pos value))
(define (buffer-clear-mark! buf [mtype main-mark-type])
(define pos (find-mark-pos (buffer-rope buf) mtype))
(if pos
(buffer-lift clear-mark buf mtype pos)
buf))
(define (buffer-mark-pos buf [mtype main-mark-type])
(find-mark-pos (buffer-rope buf) mtype))
(define (buffer-region-split* buf pos mark)
(define lo (min pos mark))
(define hi (max pos mark))
(define-values (l mr) (rope-split (buffer-rope buf) lo))
(define-values (m r) (rope-split mr (- hi lo)))
(values l m r))
(define (buffer-region-split buf
#:point [pos (buffer-pos buf)]
#:mark [mark (buffer-mark-pos buf)])
(buffer-region-split* buf pos mark))
(define (buffer-region buf
#:point [pos (buffer-pos buf)]
#:mark [mark (buffer-mark-pos buf)])
(define-values (_l m _r) (buffer-region-split* buf pos mark))
m)
(define (buffer-region-update! buf updater
#:point [pos (buffer-pos buf)]
#:mark [mark (buffer-mark-pos buf)])
(define-values (l m r) (buffer-region-split* buf pos mark))
(set-buffer-rope! buf (rope-concat (list l (updater m) r)))
buf)
(define (call-with-excursion buf f)
(define excursion (gensym 'excursion))
(define saved-mark-type (mark-type (format "Saved mark ~a" excursion) 'right))
(define saved-point-type (mark-type (format "Saved point ~a" excursion) 'right))
(buffer-mark! buf saved-mark-type #:position (buffer-mark-pos buf))
(buffer-mark! buf saved-point-type #:position (buffer-pos buf))
(define (restore!)
(define restore-mark-pos (buffer-mark-pos buf saved-mark-type))
(define restore-point-pos (buffer-mark-pos buf saved-point-type))
(when restore-mark-pos (buffer-mark! buf #:position restore-mark-pos))
(when restore-point-pos (buffer-move-to! buf restore-point-pos))
(buffer-clear-mark! buf saved-mark-type)
(buffer-clear-mark! buf saved-point-type))
(with-handlers [(exn? (lambda (e)
(restore!)
(raise e)))]
(define result (f))
(restore!)
result))
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(define (buffer-search* buf start-pos forward? move? find-delta)
(define-values (l r) (rope-split (buffer-rope buf) start-pos))
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(define delta (find-delta (if forward? r l)))
(define new-pos (+ start-pos (cond [(not delta) 0] [forward? delta] [else (- delta)])))
(when delta
(if move?
(buffer-move-to! buf new-pos)
(buffer-seek! buf new-pos)))
new-pos)
(define (buffer-search buf needle
#:position [start-pos (buffer-pos buf)]
#:forward? [forward? #t]
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#:move? [move? #f])
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(buffer-search* buf start-pos forward? move?
(lambda (piece) (search-rope needle piece #:forward? forward?))))
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(define (buffer-findf buf f
#:position [start-pos (buffer-pos buf)]
#:forward? [forward? #t]
#:move? [move? #f])
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(buffer-search* buf start-pos forward? move?
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(lambda (piece) (findf-in-rope f piece #:forward? forward?))))
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(define (buffer-lift f buf . args)
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(define new-rope (apply f (buffer-rope buf) args))
(set-buffer-rope! buf new-rope)
buf)