368 lines
12 KiB
Scheme
368 lines
12 KiB
Scheme
;;This addition provides a directory-tree-browsing-functionality.
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;;This means:
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;;When using it you hand over a list of strings, that shall be
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;;interpreted as paths and a string that represents the path, relative to
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;;which the path-list is given.
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;;In the result-window of the NUIT a file-browsing screen is shown
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;;which you can browse in using arrow-keys and enter. You can also
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;;select some items and paste them into the upper window.
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;;If there are paths to files handed over that do not exist, they will not be
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;;displayed in the browser!
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;;If the given path does not exist you will not be able to navigate!
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(define key-m 109)
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(define key-u 117)
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(define-record-type browse-dir-list-res-obj browse-dir-list-res-obj
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(make-browse-dir-list-res-obj pos-y
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pos-x
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file-list
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result-text
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working-directory
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width
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initial-wd
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marked-items
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res-marked-items
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c-x-pressed)
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browse-dir-list-res-obj?
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(pos-y browse-dir-list-res-obj-pos-y)
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(pos-x browse-dir-list-res-obj-pos-x)
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(file-list browse-dir-list-res-obj-file-list)
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(result-text browse-dir-list-res-obj-result-text)
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(working-directory browse-dir-list-res-obj-working-directory)
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(width browse-dir-list-res-obj-width)
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(initial-wd browse-dir-list-res-obj-initial-wd)
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(marked-items browse-dir-list-res-obj-marked-items)
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(res-marked-items browse-dir-list-res-obj-res-marked-items)
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(c-x-pressed browse-dir-list-res-obj-c-x-pressed))
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;;Layout of the directory-tree-browser
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(define layout-result-browse-dir-list
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(lambda (result-str result width directory)
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(begin
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(let ((printed-file-list (print-file-list-1 result directory))
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(heading ""))
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(begin
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(if (<= (string-length directory) (- width 25))
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(set! heading (string-append "Paths relative to "
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directory " :"))
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(let ((dir-string (substring directory
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(- (string-length directory)
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(- width 25))
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(string-length directory))))
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(set! heading (string-append "Paths relative to ..."
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dir-string))))
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(append (list heading) (list " <-") printed-file-list))))))
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;;One File per-line
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;;In case the object is a directory "/" is added
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(define print-file-list-1
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(lambda (file-list dir)
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(let loop ((old file-list)
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(new '()))
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(if (equal? '() old)
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new
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(let* ((hd (list-ref old 0))
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(hd-path (string-append dir "/" hd))
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(tl (cdr old)))
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(if (file-exists? hd-path)
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(if (file-directory? hd-path)
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(let ((new-str (string-append " " hd "/")))
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(loop tl (append new (list new-str))))
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(loop tl (append new (list (string-append " " hd)))))
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(loop tl new)))))))
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;;selection->descend
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(define selected-browse-dir-list
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(lambda (model)
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(let ((ln (browse-dir-list-res-obj-pos-y model))
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(wd (browse-dir-list-res-obj-working-directory model)))
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(if (not (file-exists? wd))
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model
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(begin (chdir wd)
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(if (or (>= ln (+ (length
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(browse-dir-list-res-obj-result-text model)) 1))
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(<= ln 1))
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model
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(if (= ln 2)
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(if (not (equal? "/" (cwd)))
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(begin
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(chdir "..")
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(let* ((new-result (evaluate "(directory-files)"))
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(new-result-string (exp->string new-result))
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(width (browse-dir-list-res-obj-width model))
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(new-text (layout-result-browse-dir-list
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new-result-string
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new-result width (cwd)))
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(new-model (make-browse-dir-list-res-obj
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2
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1
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new-result
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new-text
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(cwd)
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width
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(browse-dir-list-res-obj-initial-wd
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model)
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(browse-dir-list-res-obj-marked-items
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model)
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(browse-dir-list-res-obj-res-marked-items
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model)
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(browse-dir-list-res-obj-c-x-pressed
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model))))
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new-model))
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model)
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(let* ((text (browse-dir-list-res-obj-result-text model))
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(ent (list-ref text (- ln 1)))
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(len (string-length ent))
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(last-char (substring ent (- len 1) len))
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(rest (substring ent 1 (- len 1))))
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(if (equal? last-char "/")
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(begin
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(chdir wd)
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(chdir rest)
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(let* ((new-result (evaluate "(directory-files)"))
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(new-result-string (exp->string new-result))
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(width (browse-dir-list-res-obj-width model))
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(new-text (layout-result-browse-dir-list
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new-result-string new-result width
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(cwd)))
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(new-model (make-browse-dir-list-res-obj
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2
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1
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new-result
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new-text
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(cwd)
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width
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(browse-dir-list-res-obj-initial-wd
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model)
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(browse-dir-list-res-obj-marked-items
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model)
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(browse-dir-list-res-obj-res-marked-items
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model)
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(browse-dir-list-res-obj-c-x-pressed model))))
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new-model))
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model)))))))))
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(define browse-dir-list-receiver
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(lambda (message)
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(cond
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((next-command-message? message)
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(let* ((command (next-command-string message))
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(parameters (next-command-message-parameters message))
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(result #f)
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(width (next-command-message-width message)))
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(if (< (length parameters) 2)
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(begin
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(set! result (list "forgot parameters?"))
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(let* ((text
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(layout-result-standard "forgot parameters?"
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result width))
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(browse-obj
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(make-browse-dir-list-res-obj 1 1 result text (cwd)
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width (cwd) '() '() #f)))
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browse-obj))
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(let* ((file-list
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(evaluate (list-ref parameters 0)))
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(dir (evaluate (list-ref parameters 1)))
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(result-string (exp->string file-list))
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(width (next-command-message-width message))
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(text
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(layout-result-browse-dir-list result-string
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file-list width dir))
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(browse-obj
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(make-browse-dir-list-res-obj 2 1 file-list text dir width
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(cwd) '() '() #f)))
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browse-obj))))
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((print-message? message)
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(let* ((model (print-message-object message))
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(pos-y (browse-dir-list-res-obj-pos-y model))
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(pos-x (browse-dir-list-res-obj-pos-x model))
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(text (browse-dir-list-res-obj-result-text model))
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(marked-pos (get-marked-positions-3
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(browse-dir-list-res-obj-file-list model)
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(browse-dir-list-res-obj-marked-items model))))
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(make-print-object pos-y pos-x text (list pos-y) marked-pos)))
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((key-pressed-message? message)
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(let* ((model (key-pressed-message-result-model message))
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(key (key-pressed-message-key message))
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(c-x-pressed (browse-dir-list-res-obj-c-x-pressed model)))
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(cond
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;; user pressed 'm' --- mark current entry
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((= key key-m)
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(let* ((marked-items (browse-dir-list-res-obj-marked-items model))
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(res-marked-items (browse-dir-list-res-obj-res-marked-items
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model))
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(actual-pos (browse-dir-list-res-obj-pos-y model))
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(all-items (browse-dir-list-res-obj-file-list model)))
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(if (<= actual-pos 2)
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model
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(let ((actual-item (list-ref all-items (- actual-pos 3)))
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(actual-res-item #f))
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(begin
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(if (not (string=? (cwd) "/"))
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(set! actual-res-item (string-append (cwd) "/" actual-item))
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(set! actual-res-item (string-append "/" actual-item)))
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(if (member actual-res-item marked-items)
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model
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(let* ((new-res-marked-items (append res-marked-items
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(list
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actual-res-item)))
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(new-marked-items (append marked-items
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(list actual-item)))
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(new-model (make-browse-dir-list-res-obj
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(browse-dir-list-res-obj-pos-y model)
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(browse-dir-list-res-obj-pos-x model)
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(browse-dir-list-res-obj-file-list
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model)
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(browse-dir-list-res-obj-result-text
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model)
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(browse-dir-list-res-obj-working-directory
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model)
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(browse-dir-list-res-obj-width model)
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(browse-dir-list-res-obj-initial-wd
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model)
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new-marked-items
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new-res-marked-items
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#f)))
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new-model)))))))
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;; user pressed 'u' --- unmark current entry
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((= key key-u)
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(let* ((marked-items (browse-dir-list-res-obj-marked-items model))
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(res-marked-items (browse-dir-list-res-obj-res-marked-items
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model))
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(actual-pos (browse-dir-list-res-obj-pos-y model))
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(all-items (browse-dir-list-res-obj-file-list model)))
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(if (<= actual-pos 2)
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model
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(let* ((actual-item (list-ref all-items (- actual-pos 3)))
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(actual-res-item (string-append (cwd) "/" actual-item))
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(rest (member actual-item marked-items))
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(res-rest (member actual-res-item res-marked-items)))
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(if (not res-rest)
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model
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(let* ((after-item (length rest))
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(all-items (length marked-items))
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(before-item (sublist marked-items
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0
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(- all-items
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after-item )))
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(new-marked-items (append before-item
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(list-tail rest 1)))
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(after-res-item (length res-rest))
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(all-res-items (length res-marked-items))
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(before-res-item (sublist res-marked-items
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0
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(- all-res-items
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after-res-item)))
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(new-res-marked-items (append before-res-item
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(list-tail res-rest
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1)))
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(new-model (make-browse-dir-list-res-obj
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(browse-dir-list-res-obj-pos-y model)
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(browse-dir-list-res-obj-pos-x model)
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(browse-dir-list-res-obj-file-list
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model)
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(browse-dir-list-res-obj-result-text
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model)
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(browse-dir-list-res-obj-working-directory
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model)
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(browse-dir-list-res-obj-width model)
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(browse-dir-list-res-obj-initial-wd
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model)
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new-marked-items
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new-res-marked-items
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#f)))
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new-model))))))
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((= key key-up)
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(let ((posy (browse-dir-list-res-obj-pos-y model)))
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(if (<= posy 2)
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model
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(let* ((new-posy (- posy 1))
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(new-model (make-browse-dir-list-res-obj
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new-posy
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(browse-dir-list-res-obj-pos-x model)
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(browse-dir-list-res-obj-file-list model)
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(browse-dir-list-res-obj-result-text model)
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(browse-dir-list-res-obj-working-directory
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model)
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(browse-dir-list-res-obj-width model)
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(browse-dir-list-res-obj-initial-wd model)
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(browse-dir-list-res-obj-marked-items model)
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(browse-dir-list-res-obj-res-marked-items
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model)
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#f)))
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new-model))))
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((= key key-down)
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(let ((posy (browse-dir-list-res-obj-pos-y model))
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(num-lines (length
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(browse-dir-list-res-obj-result-text model))))
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(if (>= posy num-lines)
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model
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(let* ((new-posy (+ posy 1))
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(new-model (make-browse-dir-list-res-obj
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new-posy
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(browse-dir-list-res-obj-pos-x model)
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(browse-dir-list-res-obj-file-list model)
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(browse-dir-list-res-obj-result-text model)
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(browse-dir-list-res-obj-working-directory
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model)
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(browse-dir-list-res-obj-width model)
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(browse-dir-list-res-obj-initial-wd model)
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(browse-dir-list-res-obj-marked-items model)
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(browse-dir-list-res-obj-res-marked-items
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model)
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#f)))
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new-model))))
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((= key 10)
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(selected-browse-dir-list model))
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;; user pressed C-x
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((= key 24)
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(make-browse-dir-list-res-obj
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(browse-dir-list-res-obj-pos-y model)
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(browse-dir-list-res-obj-pos-x model)
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(browse-dir-list-res-obj-file-list model)
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(browse-dir-list-res-obj-result-text model)
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(browse-dir-list-res-obj-working-directory
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model)
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(browse-dir-list-res-obj-width model)
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(browse-dir-list-res-obj-initial-wd model)
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(browse-dir-list-res-obj-marked-items model)
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(browse-dir-list-res-obj-res-marked-items
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model)
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(not c-x-pressed)))
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(else model))))
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((restore-message? message)
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(let* ((model (restore-message-object message))
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(initial-wd (browse-dir-list-res-obj-initial-wd model)))
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(chdir initial-wd)))
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((selection-message? message)
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(let* ((model (selection-message-object message))
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(marked-items (browse-dir-list-res-obj-res-marked-items model)))
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(string-append "'" (exp->string marked-items)))))))
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(define browse-dir-list-rec (make-receiver "browse-dir-list"
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browse-dir-list-receiver))
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(set! receivers (cons browse-dir-list-rec receivers))
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