* Now removing all duplicates by default, not only consecutive ones
* Use multi-line history elements when a multi-line expression is entered svn: r10415
This commit is contained in:
Eli Barzilay
parent
4ca2fb8c00
commit
3e0de8592d
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@ -1,8 +1,9 @@
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(module mzrl mzscheme
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#lang scheme/base
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(require mzlib/foreign) (unsafe!)
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(require mzlib/foreign (only-in '#%foreign ffi-obj)) (unsafe!)
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(provide readline readline-bytes
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add-history add-history-bytes
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history-length history-get history-delete
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set-completion-function!)
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;; libtermcap needed on some platforms
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@ -42,6 +43,41 @@
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(define add-history-bytes
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(get-ffi-obj "add_history" libreadline (_fun _bytes -> _void)))
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(define history-length
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(let ([hl (ffi-obj #"history_length" libreadline)])
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(lambda () (ptr-ref hl _int))))
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(define history-base
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(let ([hb (ffi-obj #"history_base" libreadline)])
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(lambda () (ptr-ref hb _int))))
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;; The history library has this great feature: *some* function consume
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;; an index that is relative to history_base, and *some* get a plain
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;; offset. Someone just had so much fun they had to share. This
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;; deals with this absurdity, checks the range of the index, and deals
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;; with negative offsets.
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(define (hist-idx who idx base?)
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(let* ([len (history-length)]
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[idx (cond [(<= 0 idx (sub1 len)) idx]
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[(<= (- len) idx -1) (+ len idx)]
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[else (error who "index out of history range, -~a - ~a"
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len (sub1 len))])])
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(if base? (+ idx (history-base)) idx)))
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;; actually, returns a pointer to a struct with the string, but all we
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;; care about is the string...
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(define history-get
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(get-ffi-obj "history_get" libreadline
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(_fun (i) :: (_int = (hist-idx 'history-get i #t)) -> (_ptr o _string))))
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(define history-remove ; returns HIST_ENTRY* that history_free() frees
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(get-ffi-obj "remove_history" libreadline
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(_fun (i) :: (_int = (hist-idx 'history-delete i #f)) -> _pointer)))
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(define history-free ; ignore histdata_t return value
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(get-ffi-obj "free_history_entry" libreadline (_fun _pointer -> _void)))
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(define (history-delete idx)
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(history-free (history-remove idx)))
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;; Simple completion: use this with a (string -> (list-of string)) function
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;; that returns the completions for a given string (can be used with other
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;; input string types too, depending on the `type' argument). Use #f to remove
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@ -81,5 +117,3 @@
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;; make it possible to run Scheme threads while waiting for input
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(set-ffi-obj! "rl_event_hook" libreadline (_fun -> _int)
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(lambda () (sync/enable-break real-input-port) 0))
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)
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@ -1,27 +1,26 @@
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(module pread mzscheme
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(require readline/readline mzlib/file mzlib/list mzlib/string)
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#lang scheme/base
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(require "mzrl.ss" scheme/list scheme/file)
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;; --------------------------------------------------------------------------
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;; Configuration
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(define current-prompt (make-parameter #"> "))
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(define show-all-prompts (make-parameter #t))
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(define max-history (make-parameter 100))
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(define keep-duplicates (make-parameter #f))
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(define keep-blanks (make-parameter #f))
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(provide current-prompt show-all-prompts
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max-history keep-duplicates keep-blanks)
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(provide current-prompt max-history keep-duplicates keep-blanks)
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;; --------------------------------------------------------------------------
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;; Simple namespace-based completion
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;; efficiently convert symbols to byte strings
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(define symbol->bstring
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(let ([t (make-hash-table 'weak)])
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(let ([t (make-weak-hash)])
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(lambda (sym)
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(or (hash-table-get t sym #f)
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(or (hash-ref t sym #f)
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(let ([bstr (string->bytes/utf-8 (symbol->string sym))])
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(hash-table-put! t sym bstr)
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(hash-set! t sym bstr)
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bstr)))))
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;; get a list of byte strings for current bindings, cache last result
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@ -44,42 +43,59 @@
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(set-completion-function! namespace-completion)
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;; --------------------------------------------------------------------------
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;; History management
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;; (Note: local-history, and the preference are in reverse order, from
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;; the newest to the oldest.)
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(define local-history
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(let ([hist (get-preference 'readline-input-history (lambda () null))])
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(for-each add-history hist)
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(reverse hist)))
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(define local-history '())
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(define (trim-local-history)
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(when ((length local-history) . > . (max-history))
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(set! local-history (take local-history (max-history)))))
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(define (load-history)
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(set! local-history (get-preference 'readline-input-history (lambda () null)))
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(trim-local-history)
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(for-each add-history (reverse local-history)))
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;; add it now to the actual history
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(load-history)
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(define (save-history)
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(put-preferences '(readline-input-history) (list (reverse local-history))))
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(put-preferences '(readline-input-history) (list local-history)))
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(define (add-to-history s force-keep?)
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(define keep (or force-keep? (keep-duplicates)))
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(when (and (bytes? s) (or (keep-blanks) (not (zero? (bytes-length s)))))
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;; remove duplicate (keep-blanks determines how we search)
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(unless (or (null? local-history) (eq? #t keep))
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(let ([dup (let loop ([n -1] [h local-history] [r '()])
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(cond [(null? h) #f]
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[(equal? (car h) s) `(,n ,@(reverse r) ,@(cdr h))]
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[(eq? keep 'unconsecutive) #f] ; no loop
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[else (loop (sub1 n) (cdr h) (cons (car h) r))]))])
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(when dup
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(set! local-history (cdr dup))
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(history-delete (car dup)))))
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(add-history-bytes s)
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(let loop ()
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(when (< (max-history) (history-length)) (history-delete 0) (loop)))
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(set! local-history (cons s local-history))
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(trim-local-history)))
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(define (drop-history n)
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(for ([i (in-range n)]) (history-delete -1))
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(set! local-history (drop local-history n)))
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;; captured now so we don't flush some other output port
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(define readline-output-port (current-output-port))
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(port-count-lines! readline-output-port)
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(define (readline-bytes/hist p)
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(define (readline-bytes/hist p force-keep?)
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(when (eq? readline-output-port (current-output-port))
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(let-values ([(line col pos) (port-next-location readline-output-port)])
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(when (and col (< 0 col)) (newline))))
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(let ([s (readline-bytes p)])
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(when (and (bytes? s)
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(or (keep-blanks) (not (zero? (bytes-length s))))
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(or (keep-duplicates)
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(null? local-history)
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(not (equal? s (car local-history)))))
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(add-history-bytes s)
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(set! local-history (cons s local-history))
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(set! local-history
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(let loop ([n (max-history)] [l local-history])
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(cond [(null? l) null]
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[(zero? n) null]
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[else (let ([p (loop (sub1 n) (cdr l))])
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(if (eq? p (cdr l))
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l
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(cons (car l) p)))]))))
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s))
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(when (< 0 col) (newline readline-output-port))))
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(let ([s (readline-bytes p)]) (add-to-history s force-keep?) s))
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(exit-handler
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(let ([old (exit-handler)])
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@ -90,23 +106,47 @@
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;; readline-prompt can be
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;; #f: no prompt (normal state),
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;; bytes: a prompt to use
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;; 'space: a port has been used, now use spaces instead
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;; <bytes>: a prompt to use
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;; 'space: a prompt has been used, now use spaces instead
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;; (from readline-prompt-spaces)
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;; this also controls saving multi-line histories: when the prompt is #f we
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;; collect history as usual; otherwise, we accumulate the lines in a chunk (and
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;; add them to the history without removing duplicates) and at the beginning of
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;; each new chunk (when we read a line with a prompt that is not 'space) we
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;; throw away the intermediate history lines that were added and add the whole
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;; chunk as one big multiline string.
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(provide readline-prompt)
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(define readline-prompt (make-parameter #f))
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(define readline-prompt-spaces (make-parameter #" "))
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(define multiline-chunk (make-parameter '()))
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(define (get-current-prompt)
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(define (do-multiline-chunk)
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(let ([chunk (multiline-chunk)])
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(when (pair? chunk)
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(drop-history (length chunk))
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(add-to-history (apply bytes-append (reverse chunk)) #f)
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(multiline-chunk '()))))
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(define (readline-bytes/multiline-chunk prompt)
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(let ([line (readline-bytes/hist prompt #t)])
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(when (and (bytes? line) (not (zero? (bytes-length line))))
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(let ([c (multiline-chunk)])
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(multiline-chunk (if (pair? c)
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(list* line (readline-prompt-spaces) #"\n" c)
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(cons line c)))))
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line))
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(define (do-one-line)
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(let ([p (readline-prompt)])
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(case p
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[(#f) #""]
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[(space) (readline-prompt-spaces)]
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[else (unless (= (bytes-length (readline-prompt-spaces))
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[(#f) (do-multiline-chunk) (readline-bytes/hist #"" #f)]
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[(space) (readline-bytes/multiline-chunk (readline-prompt-spaces))]
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[else (do-multiline-chunk)
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(unless (= (bytes-length (readline-prompt-spaces))
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(bytes-length p))
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(readline-prompt-spaces (make-bytes (bytes-length p) 32)))
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(readline-prompt 'space) ; use spaces next time
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p])))
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(readline-bytes/multiline-chunk p)])))
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(provide readline-input)
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(define readline-input
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@ -121,7 +161,7 @@
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(cond [closed? eof]
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[(eof-object? buffer) (set! buffer #f) eof]
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[(not buffer)
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(set! buffer (readline-bytes/hist (get-current-prompt)))
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(set! buffer (do-one-line))
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(if (eof-object? buffer)
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(begin (save-history) (set! buffer #f) eof)
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(begin (set! skip 0)
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@ -150,52 +190,16 @@
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;; --------------------------------------------------------------------------
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;; Reading functions
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;; like read-syntax, but waits until valid input is ready
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(define read-complete-syntax
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(let ([leftovers '()]
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[counter 1])
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(lambda ()
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(if (pair? leftovers)
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(begin0 (car leftovers)
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(set! leftovers (cdr leftovers)))
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(let big-loop ()
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(let loop ([s (read-line)] [next-pos 1] [force? #f])
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(if (eof-object? s)
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(begin (save-history) s)
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(with-handlers ([(if force? (lambda (x) #f) exn:fail:read:eof?)
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(lambda (exn)
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(let ([v (read-line)])
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(loop (string-append
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s "\n" (if (eof-object? v) "" v))
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(add1 next-pos)
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(eof-object? v))))])
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(let ([p (open-input-string (string-append s "\n"))])
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(port-count-lines! p)
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(let ([rs (let loop ()
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(let ([r (read-syntax
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(string->symbol
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(format "repl-~a" counter))
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p)])
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(if (eof-object? r) '() (cons r (loop)))))])
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(if (null? rs)
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(big-loop)
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(begin0 (car rs)
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(set! counter (add1 counter))
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(set! leftovers (cdr rs))))))))))))))
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;; a function that can be used for current-prompt-read
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(provide read-cmdline-syntax)
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(define (read-cmdline-syntax)
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(define prompt (current-prompt))
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(flush-output)
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;; needs to set `readline-prompt' to get a prompt when reading
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(parameterize ([read-accept-reader #t]
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[readline-prompt prompt])
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(parameterize ([read-accept-reader #t] [readline-prompt prompt])
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(unless (eq? readline-input (current-input-port))
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;; not the readline port -- print the prompt (changing the
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;; readline-prompt and using read-complete-syntax below should still
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;; work fine)
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(display prompt) (flush-output))
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(if (show-all-prompts) (read-syntax) (read-complete-syntax))))
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)
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(begin0 (read-syntax) (do-multiline-chunk))))
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@ -116,10 +116,13 @@ A parameter that determines the number of history entries to save,
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defaults to @scheme[100].}
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@defboolparam[keep-duplicates keep?]{
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@defparam[keep-duplicates keep? (one-of/c #f 'unconsecutive #t)]{
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A parameter. If @scheme[#f] (the default), then lines that are equal
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to the previous one are not added as new history items.}
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A parameter. If @scheme[#f] (the default), then when a line is equal
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to a previous one, the previous one is removed. If it set to
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@scheme['unconsecutive] then this happens only for an line that
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duplicates the previous one, and if it is @scheme[#f] then all
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duplicates are kept.}
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@defboolparam[keep-blanks keep?]{
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@ -186,11 +189,29 @@ Adds the given string to the @|readline| history, which is accessible to
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the user via the up-arrow key.}
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@defproc[(add-history-bytes [str string?]) void?]{
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@defproc[(add-history-bytes [str bytes?]) void?]{
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Adds the given byte string to the @|readline| history, which is
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accessible to the user via the up-arrow key.}
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@defproc[(history-length) nonnegative-exact-integer?]{
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Returns the length of the history list.}
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@defproc[(history-get [idx integer?]) string?]{
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Returns the history string at the @scheme[idx] position. @scheme[idx]
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can be negative, which will make it count from the last (i.e,
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@scheme[-1] returns the last item, @scheme[-2] returns the
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second-to-last, etc.)}
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@defproc[(history-delete [idx integer?]) string?]{
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Deletes the history string at the @scheme[idx] position. The position
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is specified in the same way as the argument for @scheme[history-get].}
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@defproc[(set-completion-function! [proc ((or/c string? bytes?)
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. -> . (listof (or/c string? bytes?)))]
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@ -9,9 +9,7 @@
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(let ([inp (current-input-port)] [outp (current-output-port)])
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(when (and (eq? 'stdin (object-name inp)) (terminal-port? inp))
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(dynamic-require rep-start #f)
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(when (terminal-port? outp)
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(port-count-lines! outp))))
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(dynamic-require rep-start #f)))
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(define readline-init-expr
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'(require readline/rep))
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