528 lines
14 KiB
Scheme
528 lines
14 KiB
Scheme
;; ,load /home/demattia/studium/studienarbeit/scsh-ncurses/scheme/scsh-nui-engine.scm
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;;*************************************************************************
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;;Zustand
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;;Zustand des oberen Fensters (Command-Window)
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;;---------------------------
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;;Text
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(define text-command (list "Welcome in the scsh-ncurses-ui!" ""))
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;;gibt an, in welcher Zeile der gesamten Command-History man sich befindet
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(define pos-command 2)
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;;in welcher Spalte
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(define pos-command-col 2)
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;;gibt an, in welcher Zeile des Buffers nach Zeilenumbruch man sich befindet.
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(define pos-command-fin-ln 2)
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;;gibt an, in welcher Zeile des Buffers man sich befindet
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(define command-buffer-pos-y 2)
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;;gibt an, an welcher Position des Buffers man sich befindet.
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(define command-buffer-pos-x 2)
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;;Anzahl der Zeilen des Commando-Buffers
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(define command-lines 0)
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;;Anzahl der Spalten des Commando-Buffers
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(define command-cols 0)
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;;befindet sich der cursor am Ende der letzten Zeile des command-wins?
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(define can-write-command #t)
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;;Zustand des unteren Fensters (Result-Window)
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;;----------------------------
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;;Text
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(define text-result (list "Start entering commands."
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"Ctrl-h for help."))
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;;gibt an, in welcher Zeile des Result-Buffers man sich befindet
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(define pos-result 2)
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;;in welcher Spalte
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(define pos-result-col 17)
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;;gibt an, in welcher Zeile des Buffers man sich befindet
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(define result-buffer-pos-y 2)
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;;gibt an, an welcher Position des Buffers man sich befindet.
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(define result-buffer-pos-x 2)
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;;Anzahl der Zeilen des Buffers
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(define result-lines 0)
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;;Anzahl der Spalten des Buffers
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(define result-cols 0)
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;;allgemeiner Zustand
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;;-------------------
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;;entweder 1...oben oder 2...unten
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(define active-buffer 1)
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;;*************************************************************************
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;;Verhalten
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;;Eingabe verarbeiten
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(define run
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(lambda ()
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(let loop ((ch (paint)))
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(cond
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;;Beenden
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((= ch key-f1)
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#t)
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;;Enter
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((= ch 10)
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(if (= active-buffer 1)
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(begin
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(execute-command)
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(loop (paint)))
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(loop (paint))))
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;;Backspace
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((= ch key-backspace)
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(if (= active-buffer 1)
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(if can-write-command
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(if (< pos-command-col 3)
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(loop (paint))
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(begin
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(remove-from-command-buffer)
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(set! pos-command-col (- pos-command-col 1))
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(loop (paint))))
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(loop (paint)))
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(loop (paint))))
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;;Navigieren
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((= ch key-up)
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(if (= active-buffer 1)
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(if (< pos-command-fin-ln 2)
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(loop (paint))
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(let ((length-prev-line
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(string-length
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(list-ref text-command (- pos-command 2)))))
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(begin
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(set! can-write-command #f)
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(set! pos-command (- pos-command 1))
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(set! pos-command-col (+ length-prev-line 2))
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(loop (paint)))))
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(if (< pos-result 2)
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(loop (paint))
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(let ((length-prev-line
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(string-length
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(list-ref text-result (- pos-result 2)))))
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(begin
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(set! pos-result (- pos-result 1))
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(set! pos-result-col (+ length-prev-line 1))
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(loop (paint)))))))
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((= ch key-down)
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(if (= active-buffer 1)
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(let ((last-pos (length text-command)))
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(if (>= pos-command last-pos)
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(loop (paint))
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(let ((length-next-line
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(string-length
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(list-ref text-command pos-command))))
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(begin
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(set! pos-command-col (+ length-next-line 2))
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(set! pos-command (+ pos-command 1))
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(if (= pos-command last-pos)
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(set! can-write-command #t))
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(loop (paint))))))
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(let ((last-pos (length text-result)))
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(if (>= pos-result last-pos)
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(loop (paint))
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(let ((length-next-line
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(string-length
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(list-ref text-result pos-result))))
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(begin
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(set! pos-result-col (+ length-next-line 1))
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(set! pos-result (+ pos-result 1))
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(loop (paint))))))))
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((= ch key-left)
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(if (= active-buffer 1)
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(if (<= pos-command-col 2)
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(loop (paint))
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(begin
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(set! pos-command-col (- pos-command-col 1))
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(loop (paint))))
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(if (<= pos-result-col 1)
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(loop (paint))
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(begin
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(set! pos-result-col (- pos-result-col 1))
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(loop (paint))))))
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((= ch key-right)
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(if (= active-buffer 1)
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(let ((line-length (string-length
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(list-ref text-command (- pos-command 1)))))
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(if (>= pos-command-col (+ line-length 2))
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(loop (paint))
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(begin
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(set! pos-command-col (+ pos-command-col 1))
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(loop (paint)))))
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(let ((line-length (string-length
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(list-ref text-result (- pos-result 1)))))
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(if (>= pos-result-col (+ line-length 1))
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(loop (paint))
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(begin
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(set! pos-result-col (+ pos-result-col 1))
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(loop (paint)))))))
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;;Ctrl+b -> Buffer wechseln
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((= ch 2)
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(begin
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(if (= active-buffer 1)
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(set! active-buffer 2)
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(set! active-buffer 1))
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(loop (paint))))
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;;Ctrl+a -> Zeilenanfang
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((= ch 1)
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(if (= active-buffer 1)
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(begin
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(set! command-buffer-pos-x 2)
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(loop (paint)))))
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;;Ctrl-e -> Zeilenende
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((= ch 5)
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(if (= active-buffer 1)
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(let ((line-length (string-length
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(list-ref text-command (- pos-command 1)))))
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(begin
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(set! command-buffer-pos-x (+ line-length 2))
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(loop (paint))))))
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(else
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(if (= active-buffer 1)
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(if (<= ch 255)
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(if can-write-command
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(begin
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(add-to-command-buffer ch)
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(loop (paint)))
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(loop (paint)))
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(loop (paint)))))))))
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;;darstellen und auf Eingabe warten
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(define paint
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(lambda ()
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(begin
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(init-screen)
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(cbreak)
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(let* ((bar1-y 0)
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(bar1-x 0)
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(bar1-h 3)
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(bar1-w (COLS))
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(bar2-y (round (/ (LINES) 3)))
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(bar2-x 0)
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(bar2-h 3)
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(bar2-w (COLS))
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(comwin-y 3)
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(comwin-x 0)
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(comwin-h (- bar2-y 3))
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(comwin-w (COLS))
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(reswin-y (+ bar2-y 3))
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(reswin-x 0)
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(reswin-h (- (- (- (LINES) 6) comwin-h) 3))
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(reswin-w (COLS))
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(bar3-y (+ reswin-y reswin-h))
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(bar3-x 0)
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(bar3-h 3)
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(bar3-w (COLS)))
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(let ((bar1 (newwin bar1-h bar1-w bar1-y bar1-x))
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(bar2 (newwin bar2-h bar2-w bar2-y bar2-x))
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(command-win (newwin comwin-h comwin-w comwin-y comwin-x))
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(result-win (newwin reswin-h reswin-w reswin-y reswin-x))
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(bar3 (newwin bar3-h bar3-w bar3-y bar3-x)))
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(box bar1 (ascii->char 0) (ascii->char 0))
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(mvwaddstr bar1 1 1 "Command")
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(wrefresh bar1)
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(box bar2 (ascii->char 0) (ascii->char 0))
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(mvwaddstr bar2 1 1 "Result")
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(wrefresh bar2)
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(box command-win (ascii->char 0) (ascii->char 0))
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(set! command-lines (- comwin-h 2))
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(set! command-cols (- comwin-w 3))
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(print-command-buffer command-win)
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(wrefresh command-win)
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(box result-win (ascii->char 0) (ascii->char 0))
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(set! result-lines (- reswin-h 2))
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(set! result-cols (- reswin-w 3))
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(print-result-buffer result-win)
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(wrefresh result-win)
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(box bar3 (ascii->char 0) (ascii->char 0))
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(wattron bar3 (A-REVERSE))
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(mvwaddstr bar3 1 1 "F1:Exit | Ctrl+b:Switch-Buffer")
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(wstandend bar3)
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(wrefresh bar3)
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(cursor-right-pos command-win result-win comwin-h reswin-h)
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(noecho)
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(keypad bar1 #t)
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(let ((ch (wgetch bar1)))
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(wclear bar1)
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(wclear bar2)
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(wclear command-win)
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(wclear result-win)
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(wclear bar3)
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(clear)
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(endwin)
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(echo)
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ch
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))))))
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;;Eingabe wurde durch Benutzer best<73>tigt -> Kommando ausfuehren
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(define execute-command
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(lambda ()
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(let ((command (list-ref text-command (- (length text-command) 1))))
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;(command)
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;(set! text-command (append text-command (list "unknown command")))
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(layout-result command result-cols)
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(set! text-command (append text-command (list "")))
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(scroll-command-buffer))))
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;;Nach einer Eingabe kann es sein, dass die aktive Buffer_Zeile verschoben
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;;werden muss.
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(define scroll-command-buffer
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(lambda ()
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(begin
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(set! pos-command (+ pos-command 1))
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(set! pos-command-col 2))))
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;;Der Benutzer muss sich darum k<>mmern, dass das Ergebnis sinnvoll
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;;dargestellt wird.
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(define layout-result
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(lambda (command width)
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;;standard
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(begin
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(let ((com (if (> (string-length command) (- width 22))
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(string-append (substring command 0 (- width 22)) "...")
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command)))
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(set! text-result (cons (string-append "command unknown: " com) '()))
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(set! pos-result-col (+ 18 (string-length com)))
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(set! pos-result 1)))))
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;;Ein Character zur letzten Zeile des Command-Buffers hinzuf<75>gen
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(define add-to-command-buffer
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(lambda (ch)
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(let* ((last-pos (- (length text-command) 1))
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(old-last-el (list-ref text-command last-pos))
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(old-rest (sublist text-command 0 last-pos))
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(before-ch (substring old-last-el 0
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(max 0 (- pos-command-col 2))))
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(after-ch (substring old-last-el
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(max 0 (- pos-command-col 2))
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(string-length old-last-el)))
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(new-last-el (string-append before-ch
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(string (ascii->char ch))
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after-ch)))
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(set! text-command (append old-rest (list new-last-el)))
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(set! pos-command-col (+ pos-command-col 1)))))
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;;Ein Character aus der letzten Zeile entfernen (backspace)
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(define remove-from-command-buffer
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(lambda ()
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(let* ((last-pos (- (length text-command) 1))
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(old-last-el (list-ref text-command last-pos))
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(old-rest (sublist text-command 0 last-pos))
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(before-ch (substring old-last-el 0
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(max 0 (- pos-command-col 3))))
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(after-ch (if (= pos-command-col
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(+ (string-length old-last-el) 2))
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""
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(substring old-last-el
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(max 0 (- pos-command-col 2))
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(string-length old-last-el))))
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(new-last-el (if (= pos-command-col
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(+ (string-length old-last-el) 2))
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before-ch
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(string-append before-ch after-ch))))
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(set! text-command (append old-rest (list new-last-el))))))
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;;Es wird der sichtbare Teil der bisherigen Eingaben in den Command-
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;;Buffer angezeigt.
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(define print-command-buffer
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(lambda (comwin)
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(let ((lines (get-right-command-lines)))
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(let loop ((pos 1))
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(if (> pos command-lines)
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values
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(let ((line (list-ref lines (- pos 1))))
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(begin
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(mvwaddstr comwin pos 1 line)
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(wrefresh comwin)
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(loop (+ pos 1)))))))))
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;;Anzeigen des sichtbaren Teils des Result-Buffers
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(define print-result-buffer
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(lambda (reswin)
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(let ((lines (get-right-result-lines)))
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(let loop ((pos 1))
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(if (> pos result-lines)
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values
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(let ((line (list-ref lines (- pos 1))))
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(begin
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(mvwaddstr reswin pos 1 line)
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(wrefresh reswin)
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(loop (+ pos 1)))))))))
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;;Es werden die anzuzeigenden Zeilen erzeugt.
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;;n<>tig, damit auch Befehle <20>ber mehrere Zeilen m<>glich sind:
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(define get-right-command-lines
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(lambda ()
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(let* ((all-lines-seperated (all-commands-seperated text-command))
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(num-all-lines (length all-lines-seperated)))
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(if (>= pos-command-fin-ln command-lines)
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;;aktive Zeile ist die unterste
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(sublist all-lines-seperated
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(- pos-command-fin-ln command-lines)
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command-lines)
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(if (<= num-all-lines command-lines)
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;;noch keine ganze Seite im Buffer
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(prepare-lines all-lines-seperated
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command-lines (- pos-command-fin-ln 1))
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;;scrollen auf der ersten Seite
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(sublist all-lines-seperated 0 command-lines))))))
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;;anzuzeigende Zeilen im Result-Buffer
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(define get-right-result-lines
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(lambda ()
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(prepare-lines text-result result-lines pos-result)))
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;;Ein Statement wird in St<53>cke zerlegt, so dass dann jedes St<53>ck in eine
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;;Zeile passt.
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(define seperate-line
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(lambda (line width)
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(let loop ((new '())
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(old line))
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(if (> width (string-length old))
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(if (= 0 (string-length old))
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(if (equal? new '())
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(add-prompts '(""))
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(add-prompts new))
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;new
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(add-prompts (append (list old) new)))
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;(append (list old) new))
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(let ((next-line (substring old 0 width))
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(rest-old (substring old width (string-length old))))
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(loop (cons next-line new) rest-old))))))
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;;alle Statements zerlegen
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(define all-commands-seperated
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(lambda (commands)
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(let loop ((act-pos 1)
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(new '()))
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(begin
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(if (= act-pos pos-command)
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(let* ((length-new (length new))
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(first-el-old (list-ref commands (- act-pos 1)))
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(seperated-act (seperate-line first-el-old command-cols))
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(length-act (length seperated-act)))
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(set! pos-command-fin-ln (+ length-new length-act))))
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(if (> act-pos (length commands))
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(reverse new)
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(let* ((first-el-old (list-ref commands (- act-pos 1)))
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(seperated-fst-el-old
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(seperate-line first-el-old command-cols)))
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(loop (+ act-pos 1) (append seperated-fst-el-old new))))))))
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;;> hinzuf<75>gen
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(define add-prompts
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(lambda (l)
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(let* ((lr (reverse l))
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(old-first-el (list-ref lr 0))
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(new-first-el (string-append ">" old-first-el))
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(old-rest (list-tail lr 1)))
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(let loop ((old old-rest)
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(new (list new-first-el)))
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(if (> (length old) 0)
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(let* ((old-first-el (list-ref old 0))
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(new-first-el (string-append " " old-first-el)))
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(loop (list-tail old 1) (append new (list new-first-el))))
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(reverse new))))))
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;;Cursor an die richtige Stelle bewegen:
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(define cursor-right-pos
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(lambda (comwin reswin comwin-h reswin-h)
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(begin
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(compute-y-x)
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(if (= active-buffer 1)
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(begin
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(wmove comwin command-buffer-pos-y command-buffer-pos-x)
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(wrefresh comwin))
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(begin
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(wmove reswin result-buffer-pos-y result-buffer-pos-x)
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(wrefresh reswin))))))
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;;pos-y und pos-x berechnen
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(define compute-y-x
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(lambda ()
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(if (= active-buffer 1)
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(begin
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;;zuerst mal y
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(if (>= pos-command-fin-ln command-lines)
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;;unterste Zeile
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(set! command-buffer-pos-y command-lines)
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;;sonst
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(set! command-buffer-pos-y pos-command-fin-ln))
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;;jetzt x
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(let ((posx (modulo pos-command-col command-cols)))
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(set! command-buffer-pos-x posx)))
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(begin
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;;zuerst y
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(if (>= pos-result result-lines)
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(set! result-buffer-pos-y result-lines)
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(set! result-buffer-pos-y pos-result))
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(set! result-buffer-pos-x pos-result-col)))))
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;;Es wird in einer Liste der zu druckende Berecih ausgew<65>hlt:
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(define prepare-lines
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(lambda (l height pos)
|
||
(if (< (length l) height)
|
||
;; Liste zu kurz -> ""s hinzuf<75>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)))))
|
||
|
||
;;Teilliste
|
||
(define sublist
|
||
(lambda (l pos k)
|
||
(let ((tmp (list-tail l pos)))
|
||
(reverse (list-tail (reverse tmp)
|
||
(- (length tmp) k))))))
|
||
|
||
|
||
|
||
(run)
|
||
|