;; ,load /home/demattia/studium/studienarbeit/scsh-nuit/scheme/nuit-engine.scm
;;*************************************************************************
;;Zustand
;;Die verschiedenen Fenster
;;------------------------
(define bar1)
(define bar2)
(define bar3)
(define command-win)
(define result-win)
(define shortcuts '("F1:Exit"
"Ctrl+b:Switch Buffer"
"Ctrl+s:Insert/Select"
"Ctrl+u:-/Unselect"
"Ctrl+p:History->prev"
"Ctrl+n:History->next"
"Ctrl+a:First Pos"
"Ctrl+e:End"))
;;Zustand des oberen Fensters (Command-Window)
;;---------------------------
;;Text
(define text-command (list "Welcome in the scsh-ncurses-ui!" ""))
;;gibt an, in welcher Zeile der gesamten Command-History man sich befindet
(define pos-command 2)
;;in welcher Spalte
(define pos-command-col 2)
;;gibt an, in welcher Zeile des Buffers nach Zeilenumbruch man sich befindet.
(define pos-command-fin-ln 2)
;;gibt an, in welcher Zeile des Buffers man sich befindet
(define command-buffer-pos-y 2)
;;gibt an, an welcher Position des Buffers man sich befindet.
(define command-buffer-pos-x 2)
;;Anzahl der Zeilen des Commando-Buffers
(define command-lines 0)
;;Anzahl der Spalten des Commando-Buffers
(define command-cols 0)
;;befindet sich der cursor am Ende der letzten Zeile des command-wins?
(define can-write-command #t)
;;Zustand des unteren Fensters (Result-Window)
;;----------------------------
;;Text
(define text-result (list "Start entering commands."))
;;gibt an, in welcher Zeile des Result-Buffers man sich befindet
(define pos-result 0)
;;in welcher Spalte
(define pos-result-col 0)
;;gibt an, in welcher Zeile des Buffers man sich befindet
(define result-buffer-pos-y 0)
;;gibt an, an welcher Position des Buffers man sich befindet.
(define result-buffer-pos-x 0)
;;Anzahl der Zeilen des Buffers
(define result-lines 0)
;;Anzahl der Spalten des Buffers
(define result-cols 0)
;;welche Zeilen sollen gehighlighted werden?
(define highlighted-lines '())
;;welche Zeilen sollen markiert werden?
(define marked-lines '())
;;allgemeiner Zustand
;;-------------------
;;entweder 1...oben oder 2...unten
(define active-buffer 1)
;;History
(define history '())
;;Position in der History
(define history-pos 0)
;;Datentyp f�r History-Eintr�ge
(define-record-type history-entry history-entry
(make-history-entry command
result-object)
history-entry?
(command history-entry-command)
(result-object history-entry-result-object))
;;aktiver Befehl
(define active-command "")
;;actives Result-Objekt
(define current-result-object)
;;Typen f�r Nachrichten
;;---------------------
;;Ein neuer Befehl wurde eingegeben
;;-> neues "Object" erzeugen anhand der Parameter in einer Liste
(define-record-type next-command-message next-command-message
(make-next-command-message command-string
parameters
width)
next-command-message?
(command-string next-command-string)
(parameters next-command-message-parameters)
(width next-command-message-width))
;;Es wurde eine Taste gedr�ckt
;;->Es wird das Objekt und die Taste an den "User-Code" weitergegeben
;; und dann kommt das ver�nderte Objekt zur�ck.
(define-record-type key-pressed-message key-pressed-message
(make-key-pressed-message command-string
result-model
key)
key-pressed-message?
(command-string key-pressed-command-string)
(result-model key-pressed-message-result-model)
(key key-pressed-message-key))
;;Zeichnen
(define-record-type print-message print-message
(make-print-message command-string
object)
print-message?
(command-string print-message-command-string)
(object print-message-object))
;;->solch ein Datentyp kommt zur�ck
(define-record-type print-object print-object
(make-print-object pos-y
pos-x
text
highlighted-lines
marked-lines)
(pos-y print-object-pos-y)
(pos-x print-object-pos-x)
(text print-object-text)
(highlighted-lines print-object-highlighted-lines)
(marked-lines print-object-marked-lines))
;;Wiederherstellen (bei Seiteneffekten)
(define-record-type restore-message restore-message
(make-restore-message command-string
object)
restore-message?
(command-string restore-message-command-string)
(object restore-message-object))
;;Auswahl anfordern
(define-record-type selection-message selection-message
(make-selection-message command-string
object)
selection-message?
(command-string selection-message-command-string)
(object selection-message-object))
;;Der Benutzer muss bei Erweiterungen angeben an welche Funktion die
;;Nachrichten bei einem bestimmten Befehl auszuliefern ist
(define-record-type receiver receiver
(make-receiver command rec)
receiver?
(command receiver-command)
(rec receiver-rec))
;;*************************************************************************
;;Verhalten
;;Eingabe verarbeiten
(define run
(lambda ()
(begin
;;Initialisierung
;;erfolgt nur am Anfang
(init-screen)
(set! bar1 (newwin 0 0 0 0))
(set! bar2 (newwin 0 0 0 0))
(set! bar3 (newwin 0 0 0 0))
(set! command-win (newwin 0 0 0 0))
(set! result-win (newwin 0 0 0 0))
;;Loop
(let loop ((ch (paint)))
(cond
;;Das Resultat dieser TAstendr�cke ist unabh�ngig vom activen Buffer
;;Beenden
((= ch key-f1)
(begin
(let ((restore-message (make-restore-message
active-command
current-result-object)))
(switch restore-message))
(endwin)))
;;Ctrl+b -> Buffer wechseln
((= ch 2)
(begin
(if (= active-buffer 1)
(set! active-buffer 2)
(set! active-buffer 1))
(loop (paint))))
;;Erfolgt der TAstendruck bei aktivem Ergebnis-Buffer, so wird eine
;;entsprechende Nachricht versendet.
(else
(if (= active-buffer 2)
(let ((key-message
(make-key-pressed-message active-command
current-result-object
ch)))
(begin
(set! current-result-object (switch key-message))
(loop (paint))))
(cond
;;Enter
((= ch 10)
(begin
;;Es wird die restore-Prozedur aufgerufen
; (let ((restore-message (make-restore-message
; active-command
; current-result-object)))
; (switch restore-message))
(execute-command)
(loop (paint))))
;;Backspace
((= ch key-backspace)
(if can-write-command
(if (< pos-command-col 3)
(loop (paint))
(begin
(remove-from-command-buffer)
(set! pos-command-col (- pos-command-col 1))
(loop (paint))))
(loop (paint))))
;;Navigieren
((= ch key-up)
(if (< pos-command-fin-ln 2)
(loop (paint))
(let ((length-prev-line
(string-length
(list-ref text-command (- pos-command 2)))))
(begin
(set! can-write-command #f)
(set! pos-command (- pos-command 1))
(set! pos-command-col (+ length-prev-line 2))
(loop (paint))))))
((= ch key-down)
(let ((last-pos (length text-command)))
(if (>= pos-command last-pos)
(loop (paint))
(let ((length-next-line
(string-length
(list-ref text-command pos-command))))
(begin
(set! pos-command-col (+ length-next-line 2))
(set! pos-command (+ pos-command 1))
(if (= pos-command last-pos)
(set! can-write-command #t))
(loop (paint)))))))
((= ch key-left)
(if (<= pos-command-col 2)
(loop (paint))
(begin
(set! pos-command-col (- pos-command-col 1))
(loop (paint)))))
((= ch key-right)
(let ((line-length (string-length
(list-ref text-command
(- pos-command 1)))))
(if (>= pos-command-col (+ line-length 2))
(loop (paint))
(begin
(set! pos-command-col (+ pos-command-col 1))
(loop (paint))))))
;;Ctrl+p -> History zur�ck
((= ch 16)
(begin
(history-back)
(loop (paint))))
;;Ctrl+n -> History vor
((= ch 14)
(begin
(history-forward)
(loop (paint))))
;;Ctrl+s -> Auswahl-holen
((= ch 19)
(let* ((message (make-selection-message active-command
current-result-object))
(marked-items (switch message)))
(begin
(add-string-to-command-buffer marked-items)
(loop (paint)))))
;;Ctrl+a -> Zeilenanfang
((= ch 1)
(begin
(set! pos-command-col 2)
(loop (paint))))
;;Ctrl-e -> Zeilenende
((= ch 5)
(let ((line-length (string-length
(list-ref text-command (- pos-command 1)))))
(begin
;(set! command-buffer-pos-x (+ line-length 2))
(set! pos-command-col (+ line-length 2))
(loop (paint)))))
(else
(if (<= ch 255)
(if can-write-command
(begin
(add-to-command-buffer ch)
(loop (paint)))
(loop (paint)))
(loop (paint))))))))))))
;;darstellen und auf Eingabe warten
(define paint
(lambda ()
(begin
(init-screen)
(cbreak)
(let* ((bar1-y 0)
(bar1-x 0)
(bar1-h 3)
(bar1-w (COLS))
(bar2-y (round (/ (LINES) 3)))
(bar2-x 0)
(bar2-h 3)
(bar2-w (COLS))
(comwin-y 3)
(comwin-x 0)
(comwin-h (- bar2-y 3))
(comwin-w (COLS))
(reswin-y (+ bar2-y 3))
(reswin-x 0)
(reswin-h (- (- (- (LINES) 6) comwin-h) 4))
(reswin-w (COLS))
(bar3-y (+ reswin-y reswin-h))
(bar3-x 0)
(bar3-h 4)
(bar3-w (COLS)))
(wclear bar1)
(wclear bar2)
(wclear command-win)
(wclear result-win)
(wclear bar3)
(clear)
(set! bar1 (newwin bar1-h bar1-w bar1-y bar1-x))
(set! bar2 (newwin bar2-h bar2-w bar2-y bar2-x))
(set! command-win (newwin comwin-h comwin-w comwin-y comwin-x))
(set! result-win (newwin reswin-h reswin-w reswin-y reswin-x))
(set! bar3 (newwin bar3-h bar3-w bar3-y bar3-x))
(box bar1 (ascii->char 0) (ascii->char 0))
(mvwaddstr bar1 1 1 "Command")
(wrefresh bar1)
(box bar2 (ascii->char 0) (ascii->char 0))
(mvwaddstr bar2 1 1 "Result")
(wrefresh bar2)
(box command-win (ascii->char 0) (ascii->char 0))
(set! command-lines (- comwin-h 2))
(set! command-cols (- comwin-w 3))
(print-command-buffer command-win)
(wrefresh command-win)
(box result-win (ascii->char 0) (ascii->char 0))
(set! result-lines (- reswin-h 2))
(set! result-cols (- reswin-w 3))
(print-result-buffer result-win)
(wrefresh result-win)
(box bar3 (ascii->char 0) (ascii->char 0))
(wattron bar3 (A-REVERSE))
(print-bar3 (- reswin-w 3))
;(mvwaddstr bar3 1 1 "F1:Exit | Ctrl+b:Switch-Buffer")
(wstandend bar3)
(wrefresh bar3)
(cursor-right-pos command-win result-win comwin-h reswin-h)
(noecho)
(keypad bar1 #t)
(let ((ch (wgetch bar1)))
(echo)
ch
)))))
;;Auswerten
;;Eingabe wurde durch Benutzer best�tigt -> Kommando ausfuehren
(define execute-command
(lambda ()
(let* ((command (list-ref text-command (- (length text-command) 1)))
;;Hier sollte noch die Behandlung von Parametern eingef�gt werden
(message (make-next-command-message command '() result-cols))
(model (switch message)))
(begin
;;Vorheriges Objekt in History sichern
(if (not (= history-pos 0))
(let ((hist-entry (make-history-entry active-command
current-result-object))
(active (make-history-entry command model)))
(begin
(if (< history-pos (length history))
(set! history (append history (list hist-entry)))
(set! history (append
(sublist history 0
(- (length history) 1))
(list hist-entry) (list active))))
(set! history-pos (length history))))
;;Dieser Fall tritt nur ganz am Anfang ein.
(let ((hist-entry (make-history-entry command model)))
(begin
(set! history (list hist-entry))
(set! history-pos 1))))
(set! text-command (append text-command (list "")))
(set! active-command command)
(set! current-result-object model)
(scroll-command-buffer)))))
;;Nach einer Eingabe kann es sein, dass die aktive Buffer_Zeile verschoben
;;werden muss.
(define scroll-command-buffer
(lambda ()
(begin
(set! pos-command (+ pos-command 1))
(set! pos-command-col 2))))
;;Auswerten eines Ausdrucks in Form eines String
(define evaluate
(lambda (exp)
(let* ((command-port (open-input-string exp))
(handler (lambda (condition more)
(cons 'Error: condition)))
(structure (reify-structure 'scheme-with-scsh))
(s (load-structure structure))
(env (rt-structure->environment structure))
(result (with-fatal-error-handler
handler
(eval (read command-port) env))))
result)))
;;Nachrichten-Vermittlung
;;Der Switch sorgt daf�r, dass die Nachrichten richtig ankommen
(define switch
(lambda (message)
(let ((command ""))
(begin
(cond
((next-command-message? message)
(set! command (next-command-string message)))
((key-pressed-message? message)
(set! command (key-pressed-command-string message)))
((print-message? message)
(set! command (print-message-command-string message)))
((restore-message? message)
(set! command (restore-message-command-string message)))
((selection-message? message)
(set! command (selection-message-command-string message))))
(let ((receiver (get-receiver command)))
(if receiver
(receiver message)
(standard-receiver message)))))))
(define get-receiver
(lambda (command)
(let loop ((recs receivers))
(if (= 0 (length recs))
#f
(let* ((act-rec (car recs))
(act-com (receiver-command act-rec))
(act-rec-proc (receiver-rec act-rec)))
(if (equal? command act-com)
act-rec-proc
(loop (cdr recs))))))))
;;Steuerung der oberen Buffers
;;Ein Character zur letzten Zeile des Command-Buffers hinzuf�gen
(define add-to-command-buffer
(lambda (ch)
(let* ((last-pos (- (length text-command) 1))
(old-last-el (list-ref text-command last-pos))
(old-rest (sublist text-command 0 last-pos))
(before-ch (substring old-last-el 0
(max 0 (- pos-command-col 2))))
(after-ch (substring old-last-el
(max 0 (- pos-command-col 2))
(string-length old-last-el)))
(new-last-el (string-append before-ch
(string (ascii->char ch))
after-ch)))
(set! text-command (append old-rest (list new-last-el)))
(set! pos-command-col (+ pos-command-col 1)))))
;;Einen ganzen String hinzuf�gen
;;->mehrfacher Aufruf von add-to-command-string
(define add-string-to-command-buffer
(lambda (string)
(let loop ((str string))
(if (equal? str "")
values
(let ((first-ch (string-ref str 0)))
(begin
(add-to-command-buffer (char->ascii first-ch))
(loop (substring str 1 (string-length str)))))))))
;;Ein Character aus der letzten Zeile entfernen (backspace)
(define remove-from-command-buffer
(lambda ()
(let* ((last-pos (- (length text-command) 1))
(old-last-el (list-ref text-command last-pos))
(old-rest (sublist text-command 0 last-pos))
(before-ch (substring old-last-el 0
(max 0 (- pos-command-col 3))))
(after-ch (if (= pos-command-col
(+ (string-length old-last-el) 2))
""
(substring old-last-el
(max 0 (- pos-command-col 2))
(string-length old-last-el))))
(new-last-el (if (= pos-command-col
(+ (string-length old-last-el) 2))
before-ch
(string-append before-ch after-ch))))
(set! text-command (append old-rest (list new-last-el))))))
;;Es wird der sichtbare Teil der bisherigen Eingaben in den Command-
;;Buffer angezeigt.
(define print-command-buffer
(lambda (comwin)
(let ((lines (get-right-command-lines)))
(let loop ((pos 1))
(if (> pos command-lines)
values
(let ((line (list-ref lines (- pos 1))))
(begin
(mvwaddstr comwin pos 1 line)
(wrefresh comwin)
(loop (+ pos 1)))))))))
;;Es werden die anzuzeigenden Zeilen erzeugt.
;;n�tig, damit auch Befehle �ber mehrere Zeilen m�glich sind:
(define get-right-command-lines
(lambda ()
(let* ((all-lines-seperated (all-commands-seperated text-command))
(num-all-lines (length all-lines-seperated)))
(if (>= pos-command-fin-ln command-lines)
;;aktive Zeile ist die unterste
(sublist all-lines-seperated
(- pos-command-fin-ln command-lines)
command-lines)
(if (<= num-all-lines command-lines)
;;noch keine ganze Seite im Buffer
(prepare-lines all-lines-seperated
command-lines (- pos-command-fin-ln 1))
;;scrollen auf der ersten Seite
(sublist all-lines-seperated 0 command-lines))))))
;;alle Statements zerlegen
(define all-commands-seperated
(lambda (commands)
(let loop ((act-pos 1)
(new '()))
(begin
(if (= act-pos pos-command)
(let* ((length-new (length new))
(first-el-old (list-ref commands (- act-pos 1)))
(seperated-act (seperate-line-com
first-el-old command-cols))
(length-act (length seperated-act)))
(set! pos-command-fin-ln (+ length-new length-act))))
(if (> act-pos (length commands))
(reverse new)
(let* ((first-el-old (list-ref commands (- act-pos 1)))
(seperated-fst-el-old
(seperate-line-com first-el-old command-cols)))
(loop (+ act-pos 1) (append seperated-fst-el-old new))))))))
;;Ein Statement wird in St�cke zerlegt, so dass dann jedes St�ck in eine
;;Zeile passt.
(define seperate-line-com
(lambda (line width)
(let loop ((new '())
(old line))
(if (> width (string-length old))
(if (= 0 (string-length old))
(if (equal? new '())
(add-prompts '(""))
(add-prompts new))
;new
(add-prompts (append (list old) new)))
;(append (list old) new))
(let ((next-line (substring old 0 width))
(rest-old (substring old width (string-length old))))
(loop (cons next-line new) rest-old))))))
;;> hinzuf�gen
(define add-prompts
(lambda (l)
(let* ((lr (reverse l))
(old-first-el (list-ref lr 0))
(new-first-el (string-append ">" old-first-el))
(old-rest (list-tail lr 1)))
(let loop ((old old-rest)
(new (list new-first-el)))
(if (> (length old) 0)
(let* ((old-first-el (list-ref old 0))
(new-first-el (string-append " " old-first-el)))
(loop (list-tail old 1) (append new (list new-first-el))))
(reverse new))))))
;;Es wird in einer Liste der zu druckende Berecih ausgew�hlt:
(define prepare-lines
(lambda (l height pos)
(if (< (length l) height)
;; Liste zu kurz -> ""s hinzuf�gen
(let loop ((tmp-list l))
(if (= height (length tmp-list))
tmp-list
(loop (append tmp-list (list "")))))
;; Teilliste holen
(if (< pos height)
;;pos nicht ganz unten
(sublist l 0 height)
;;standard-Fall
(sublist l (- pos height) height)))))
;;Darstellen des unteren Buffers
;;Anzeigen des sichtbaren Teils des Result-Buffers
(define print-result-buffer
(lambda (reswin)
(let* ((print-message (make-print-message active-command
current-result-object))
(model (switch print-message))
(text (print-object-text model))
(pos-y (print-object-pos-y model))
(pos-x (print-object-pos-x model))
(highlighted-lns (print-object-highlighted-lines model))
(marked-lns (print-object-marked-lines model)))
(begin
(set! text-result text)
(set! pos-result pos-y)
(set! pos-result-col pos-x)
(set! highlighted-lines highlighted-lns)
(set! marked-lines marked-lns)
(right-highlighted-lines)
(right-marked-lines)
(let ((lines (get-right-result-lines)))
(let loop ((pos 1))
(if (> pos result-lines)
values
(let ((line (list-ref lines (- pos 1))))
(if (and (member pos highlighted-lines)
(= active-buffer 2))
(begin
(wattron reswin (A-REVERSE))
(mvwaddstr reswin pos 1 line)
(wattrset reswin (A-NORMAL))
(wrefresh reswin)
(loop (+ pos 1)))
(if (member pos marked-lines)
(begin
(wattron reswin (A-BOLD))
(mvwaddstr reswin pos 1 line)
(wattrset reswin (A-NORMAL))
(wrefresh reswin)
(loop (+ pos 1)))
(begin
(mvwaddstr reswin pos 1 line)
(wrefresh reswin)
(loop (+ pos 1)))))))))))))
;;anzuzeigende Zeilen im Result-Buffer
(define get-right-result-lines
(lambda ()
(prepare-lines text-result result-lines pos-result)))
;;Markierte und gehighlightete Zeilen berechnen:
(define right-highlighted-lines
(lambda ()
(let loop ((old highlighted-lines)
(new '()))
(if (equal? '() old)
(set! highlighted-lines new)
(let ((el (car old)))
(if (<= pos-result result-lines)
;;auf der ersten Seite
(loop (cdr old)
(append new (list el)))
(let* ((offset (- pos-result result-lines))
(new-el (- el offset )))
(loop (cdr old)
(append new (list new-el))))))))))
(define right-marked-lines
(lambda ()
(let loop ((old marked-lines)
(new '()))
(if (equal? '() old)
(set! marked-lines new)
(let ((el (car old)))
(if (<= pos-result result-lines)
;;auf der ersten Seite
(loop (cdr old)
(append new (list el)))
(let* ((offset (- pos-result result-lines))
(new-el (- el offset )))
(loop (cdr old)
(append new (list new-el))))))))))
;;Cursor
;;Cursor an die richtige Stelle bewegen:
(define cursor-right-pos
(lambda (comwin reswin comwin-h reswin-h)
(begin
(compute-y-x)
(if (= active-buffer 1)
(begin
(wmove comwin command-buffer-pos-y command-buffer-pos-x)
(wrefresh comwin))
(begin
(wmove reswin result-buffer-pos-y result-buffer-pos-x)
(wrefresh reswin))))))
;;pos-y und pos-x berechnen
(define compute-y-x
(lambda ()
(if (= active-buffer 1)
(begin
;;zuerst mal y
(if (>= pos-command-fin-ln command-lines)
;;unterste Zeile
(set! command-buffer-pos-y command-lines)
;;sonst
(set! command-buffer-pos-y pos-command-fin-ln))
;;jetzt x
(let ((posx (modulo pos-command-col command-cols)))
(set! command-buffer-pos-x posx)))
(begin
;;zuerst y
(if (>= pos-result result-lines)
(set! result-buffer-pos-y result-lines)
(set! result-buffer-pos-y pos-result))
(set! result-buffer-pos-x pos-result-col)))))
;;Unterstes Fenster
(define print-bar3
(lambda (width)
(let loop ((pos 0)
(used-width 0)
(act-line 1))
(if (>= pos (length shortcuts))
(begin
(let* ((num-blanks (+ (- width used-width) 1))
(last-string (make-string num-blanks #\space)))
(mvwaddstr bar3 act-line (+ used-width 1) last-string))
(wrefresh bar3))
(let* ((act-string (list-ref shortcuts pos))
(act-length (string-length act-string))
(rest-width (- width used-width)))
(if (= act-line 1)
(if (<= (+ act-length 3) rest-width)
(if (= used-width 0)
(begin
(mvwaddstr bar3 1 (+ used-width 1) act-string)
(loop (+ pos 1) (+ used-width act-length) 1))
(begin
(mvwaddstr bar3 1 (+ used-width 1)
(string-append " | " act-string))
(loop (+ pos 1) (+ used-width (+ 3 act-length))
1)))
(begin
(let* ((num-blanks (+ rest-width 1))
(last-string (make-string num-blanks #\space)))
(mvwaddstr bar3 1 (+ used-width 1) last-string))
(loop pos 0 2)))
(if (<= (+ act-length 3) rest-width)
(if (= used-width 0)
(begin
(mvwaddstr bar3 2 (+ used-width 1) act-string)
(loop (+ pos 1) (+ used-width act-length) 2))
(begin
(mvwaddstr bar3 2 (+ used-width 1)
(string-append " | " act-string))
(loop (+ pos 1) (+ used-width (+ 3 act-length)) 2)))
(begin
(let* ((num-blanks (+ rest-width 1) )
(last-string (make-string num-blanks #\space)))
(mvwaddstr bar3 2 (+ used-width 1) last-string))
(wrefresh bar3)))))))))
;; Ein Schritt zur�ck in der History. Im unteren Buffer wird jeweils das
;; Ergebnis angezeigt
(define history-back
(lambda ()
(if (<= history-pos 0)
values
(let* ((hist-entry (list-ref history (- history-pos 1)))
(entry-com (history-entry-command hist-entry))
(entry-res-obj (history-entry-result-object hist-entry)))
(begin
(set! active-command entry-com)
(set! current-result-object entry-res-obj)
(set! text-command (append
(sublist text-command 0
(- (length text-command) 1))
(list entry-com)))
(if (> history-pos 1)
(set! history-pos (- history-pos 1))))))))
;;Ein Schritt nach vorne in der History. Analog zu history-back
(define history-forward
(lambda ()
(if (= history-pos (length history) )
(set! text-command (append
(sublist text-command 0
(- (length text-command) 1))
(list "")))
(if (> history-pos (- (length history) 1))
values
(let* ((hist-entry (list-ref history history-pos))
(entry-com (history-entry-command hist-entry))
(entry-res-obj (history-entry-result-object hist-entry)))
(begin
(set! text-command (append
(sublist text-command 0
(- (length text-command) 1))
(list entry-com)))
(set! active-command entry-com)
(set! current-result-object entry-res-obj)
(set! history-pos (+ history-pos 1))))))))
;;Teilliste
(define sublist
(lambda (l pos k)
(let ((tmp (list-tail l pos)))
(reverse (list-tail (reverse tmp)
(- (length tmp) k))))))
;;*************************************************************************
;;Die folgenden Funktionen sollten sp�ter in eine eigene Datei kommen.
;;Sie sind abh�ngig vom jeweiligen Befehl.
;;Standardfall
;;------------
;;Datentyp, der das Resultat einer "Standard-Auswertung" repr�sentiert
(define-record-type standard-result-obj standard-result-obj
(make-standard-result-obj cursor-pos-y
cursor-pos-x
result-text)
standard-result-obj?
(cursor-pos-y standard-result-obj-cur-pos-y)
(cursor-pos-x standard-result-obj-cur-pos-x)
(result-text standard-result-obj-result-text))
(define init-std-res (make-standard-result-obj 1 1 text-result))
(set! current-result-object init-std-res)
;;Standard-Receiver:
(define standard-receiver
(lambda (message)
(cond
((next-command-message? message)
(let* ((command (next-command-string message))
(result (evaluate command))
(result-string (exp->string result))
(width (next-command-message-width message)))
(let* ((text
(layout-result-standard result-string result width))
(std-obj
(make-standard-result-obj 1 1 text)))
std-obj)))
((print-message? message)
(let* ((model (print-message-object message))
(pos-y (standard-result-obj-cur-pos-y model))
(pos-x (standard-result-obj-cur-pos-x model))
(text (standard-result-obj-result-text model)))
(make-print-object pos-y pos-x text '() '())))
((key-pressed-message? message)
(key-pressed-message-result-model message))
((restore-message? message)
values)
((selection-message? message)
""))))
;;Im Standardfall wird einfach als Ergebnis die R�ckgabe der scsh ausgegeben.
(define layout-result-standard
(lambda (result-str result width)
(reverse (seperate-line result-str width))))
;;directory-files
;;---------------
(define initial-working-directory (cwd))
;;Result-Object f�r "directory-files"
(define-record-type dirfiles-result-object dirfiles-result-object
(make-dirfiles-result-object pos-y
pos-x
file-list
result-text
working-directory
width
initial-wd
marked-items
res-marked-items)
dirfiles-result-object?
(pos-y dirfiles-result-object-pos-y)
(pos-x dirfiles-result-object-pos-x)
(file-list dirfiles-result-object-file-list)
(result-text dirfiles-result-object-result-text)
(working-directory dirfiles-result-object-working-directory)
(width dirfiles-result-object-width)
(initial-wd dirfiles-result-object-initial-wd)
(marked-items dirfiles-result-object-marked-items)
(res-marked-items dirfiles-result-object-res-marked-items))
;;Darstellung, falls die Eingabe ist: "(directory-files)"
(define layout-result-dirfiles
(lambda (result-str result width)
(begin
(let ((printed-file-list (print-file-list result))
(directory (cwd))
(heading ""))
(begin
(if (<= (string-length directory) (- width 27))
(set! heading (string-append "Directory-Content of "
directory " :"))
(let ((dir-string (substring directory
(- (string-length directory)
(- width 27))
(string-length directory))))
(set! heading (string-append "Directory-Content of ..."
dir-string))))
(append (list heading) (list " <-")
printed-file-list))))))
;;Eine Datei pro Zeile
;;Falls es sich um ein Verzeichnis handelt wird "/" hinzugef�gt
(define print-file-list
(lambda (file-list)
(let loop ((old file-list)
(new '()))
(if (equal? '() old)
new
(let ((hd (list-ref old 0))
(tl (cdr old)))
(if (file-directory? hd)
(let ((new-str (string-append " " hd "/")))
(loop tl (append new (list new-str))))
(loop tl (append new (list (string-append " " hd))))))))))
;;Auswahl->absteigen
(define selected-dirfiles
(lambda (model)
(let ((ln (dirfiles-result-object-pos-y model)))
(if (or (>= ln (+ (length (dirfiles-result-object-result-text model)) 1))
(<= ln 1))
model
(if (= ln 2)
(if (not (equal? "/" (cwd)))
(begin
(chdir "..")
(let* ((new-result (evaluate "(directory-files)"))
(new-result-string (exp->string new-result))
(width (dirfiles-result-object-width model))
(new-text (layout-result-dirfiles
new-result-string new-result width))
(new-model (make-dirfiles-result-object
2
1
new-result
new-text
(cwd)
width
(dirfiles-result-object-initial-wd
model)
(dirfiles-result-object-marked-items
model)
(dirfiles-result-object-res-marked-items
model))))
new-model))
model)
(let* ((text (dirfiles-result-object-result-text model))
(ent (list-ref text (- ln 1)))
(len (string-length ent))
(last-char (substring ent (- len 1) len))
(rest (substring ent 1 (- len 1))))
(if (equal? last-char "/")
(begin
(chdir rest)
(let* ((new-result (evaluate "(directory-files)"))
(new-result-string (exp->string new-result))
(width (dirfiles-result-object-width model))
(new-text (layout-result-dirfiles
new-result-string new-result width))
(new-model (make-dirfiles-result-object
2
1
new-result
new-text
(cwd)
width
(dirfiles-result-object-initial-wd
model)
(dirfiles-result-object-marked-items
model)
(dirfiles-result-object-res-marked-items
model))))
new-model))
model)))))))
;;Receiver f�r directory-files
(define dir-files-receiver
(lambda (message)
(cond
((next-command-message? message)
(let* ((command (next-command-string message))
(result (evaluate command))
(result-string (exp->string result))
(width (next-command-message-width message))
(text (layout-result-dirfiles result-string result width))
(model (make-dirfiles-result-object 2 1 result text (cwd)
width (cwd) '() '())))
model))
((print-message? message)
(let* ((model (print-message-object message))
(posy (dirfiles-result-object-pos-y model))
(posx (dirfiles-result-object-pos-x model))
(text (dirfiles-result-object-result-text model))
(marked-pos (get-marked-positions
(dirfiles-result-object-file-list model)
(dirfiles-result-object-marked-items model))))
(make-print-object posy posx text (list posy) marked-pos)))
((key-pressed-message? message)
(let* ((model (key-pressed-message-result-model message))
(key (key-pressed-message-key message)))
(cond
((= key key-up)
(let ((posy (dirfiles-result-object-pos-y model)))
(if (<= posy 2)
model
(let* ((new-posy (- posy 1))
(new-model (make-dirfiles-result-object
new-posy
(dirfiles-result-object-pos-x model)
(dirfiles-result-object-file-list model)
(dirfiles-result-object-result-text
model)
(dirfiles-result-object-working-directory
model)
(dirfiles-result-object-width model)
(dirfiles-result-object-initial-wd model)
(dirfiles-result-object-marked-items
model)
(dirfiles-result-object-res-marked-items
model))))
new-model))))
((= key key-down)
(let ((posy (dirfiles-result-object-pos-y model))
(num-lines (length
(dirfiles-result-object-result-text model))))
(if (>= posy num-lines)
model
(let* ((new-posy (+ posy 1))
(new-model (make-dirfiles-result-object
new-posy
(dirfiles-result-object-pos-x model)
(dirfiles-result-object-file-list model)
(dirfiles-result-object-result-text
model)
(dirfiles-result-object-working-directory
model)
(dirfiles-result-object-width model)
(dirfiles-result-object-initial-wd
model)
(dirfiles-result-object-marked-items
model)
(dirfiles-result-object-res-marked-items
model))))
new-model))))
((= key 10)
(selected-dirfiles model))
;;Ctrl+s -> Auswahl
((= key 19)
(let* ((marked-items (dirfiles-result-object-marked-items model))
(res-marked-items (dirfiles-result-object-res-marked-items
model))
(actual-pos (dirfiles-result-object-pos-y model))
(all-items (dirfiles-result-object-file-list model)))
(if (<= actual-pos 2)
model
(let* ((actual-item (list-ref all-items (- actual-pos 3)))
(actual-res-item (string-append (cwd) "/" actual-item)))
(if (member actual-res-item marked-items)
model
(let* ((new-res-marked-items (append res-marked-items
(list
actual-res-item)))
(new-marked-items (append marked-items
(list actual-item)))
(new-model (make-dirfiles-result-object
(dirfiles-result-object-pos-y model)
(dirfiles-result-object-pos-x model)
(dirfiles-result-object-file-list
model)
(dirfiles-result-object-result-text
model)
(dirfiles-result-object-working-directory
model)
(dirfiles-result-object-width model)
(dirfiles-result-object-initial-wd
model)
new-marked-items
new-res-marked-items)))
new-model))))))
;;Ctrl+u -> aus Auswahl rausnehmen
((= key 21)
(let* ((marked-items (dirfiles-result-object-marked-items model))
(res-marked-items (dirfiles-result-object-res-marked-items
model))
(actual-pos (dirfiles-result-object-pos-y model))
(all-items (dirfiles-result-object-file-list model)))
(if (<= actual-pos 2)
model
(let* ((actual-item (list-ref all-items (- actual-pos 3)))
(actual-res-item (string-append (cwd) "/" actual-item))
(rest (member actual-item marked-items))
(res-rest (member actual-res-item res-marked-items)))
(if (not res-rest)
model
(let* ((after-item (length rest))
(all-items (length marked-items))
(before-item (sublist marked-items
0
(- all-items
after-item )))
(new-marked-items (append before-item
(list-tail rest 1)))
(after-res-item (length res-rest))
(all-res-items (length res-marked-items))
(before-res-item (sublist res-marked-items
0
(- all-res-items
after-res-item)))
(new-res-marked-items (append before-res-item
(list-tail res-rest
1)))
(new-model (make-dirfiles-result-object
(dirfiles-result-object-pos-y model)
(dirfiles-result-object-pos-x model)
(dirfiles-result-object-file-list
model)
(dirfiles-result-object-result-text
model)
(dirfiles-result-object-working-directory
model)
(dirfiles-result-object-width model)
(dirfiles-result-object-initial-wd
model)
new-marked-items
new-res-marked-items)))
new-model))))))
(else model))))
((restore-message? message)
;(let ((model (restore-message-object message)))
;(chdir (dirfiles-result-object-initial-wd model))))
(chdir initial-working-directory))
((selection-message? message)
(let* ((model (selection-message-object message))
(marked-items (dirfiles-result-object-res-marked-items model)))
(string-append "'" (exp->string marked-items))))
(else values))))
(define dir-files-rec
(make-receiver "(directory-files)" dir-files-receiver))
(define receivers (cons dir-files-rec '()))
;;n�tzliche Hilfsfunktionen:
(define get-marked-positions
(lambda (all-items marked-items)
(let loop ((count 0)
(result '()))
(if (>= count (length all-items))
result
(let ((act-item (list-ref all-items count)))
(if (member act-item marked-items)
(loop (+ count 1)
(append result (list (+ count 3))))
(loop (+ count 1) result)))))))
;;Ein Ausdruck als String
(define exp->string
(lambda (exp)
(let ((exp-port (open-output-string)))
(begin
(write exp exp-port)
(get-output-string exp-port)))))
;;Ein Statement wird in St�cke zerlegt, so dass dann jedes St�ck in eine
;;Zeile passt.
(define seperate-line
(lambda (line width)
(let loop ((new '())
(old line))
(if (> width (string-length old))
(if (= 0 (string-length old))
(if (equal? new '())
'("")
new)
;new
(append (list old) new))
;(append (list old) new))
(let ((next-line (substring old 0 width))
(rest-old (substring old width (string-length old))))
(loop (cons next-line new) rest-old))))))
; (define (with-fatal-error-handler* handler thunk)
; (call-with-current-continuation
; (lambda (accept)
; ((call-with-current-continuation
; (lambda (k)
; (with-handler (lambda (condition more)
; (if (error? condition)
; (call-with-current-continuation
; (lambda (decline)
; (k (lambda () (handler condition decline))))))
; (more)) ; Keep looking for a handler.
; (lambda () (call-with-values thunk accept)))))))))
; (define-syntax with-fatal-error-handler
; (syntax-rules ()
; ((with-fatal-error-handler handler body ...)
; (with-fatal-error-handler* handler
; (lambda () body ...)))))
; (run)