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;;; Lisp Game Jam 2018
;;; Copyright © 2018 David Thompson <davet@gnu.org>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (engine inotify)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module (system foreign)
#:export (make-inotify
inotify?
inotify-watches
inotify-add-watch!
inotify-pending-events?
inotify-read-event
inotify-watch?
inotify-watch-id
inotify-watch-file-name
inotify-watch-remove!
inotify-event?
inotify-event-watch
inotify-event-type
inotify-event-cookie
inotify-event-file-name))
(define libc (dynamic-link))
(define inotify-init
(pointer->procedure int (dynamic-func "inotify_init" libc) '()))
(define inotify-add-watch
(pointer->procedure int (dynamic-func "inotify_add_watch" libc)
(list int '* uint32)))
(define inotify-rm-watch
(pointer->procedure int (dynamic-func "inotify_rm_watch" libc)
(list int int)))
(define IN_ACCESS #x00000001) ; file was accessed.
(define IN_MODIFY #x00000002) ; file was modified.
(define IN_ATTRIB #x00000004) ; metadata changed
(define IN_CLOSE_WRITE #x00000008) ; file opened for writing closed
(define IN_CLOSE_NOWRITE #x00000010) ; file not opened for writing closed
(define IN_OPEN #x00000020) ; file was opened
(define IN_MOVED_FROM #x00000040) ; file was moved from X
(define IN_MOVED_TO #x00000080) ; file was moved to Y
(define IN_CREATE #x00000100) ; subfile was created
(define IN_DELETE #x00000200) ; subfile was deleted
(define IN_DELETE_SELF #x00000400) ; self was deleted
(define IN_MOVE_SELF #x00000800) ; self was moved
;; Kernel flags
(define IN_UNMOUNT #x00002000) ; backing fs was unmounted
(define IN_Q_OVERFLOW #x00004000) ; event queue overflowed
(define IN_IGNORED #x00008000) ; file was ignored
;; Special flags
(define IN_ONLYDIR #x01000000) ; only watch if directory
(define IN_DONT_FOLLOW #x02000000) ; do not follow symlink
(define IN_EXCL_UNLINK #x04000000) ; exclude events on unlinked objects
(define IN_MASK_ADD #x20000000) ; add to the mask of an existing watch
(define IN_ISDIR #x40000000) ; event occurred against directory
(define IN_ONESHOT #x80000000) ; only send event once
(define mask/symbol (make-hash-table))
(define symbol/mask (make-hash-table))
(for-each (match-lambda
((sym mask)
(hashq-set! symbol/mask sym mask)
(hashv-set! mask/symbol mask sym)))
`((access ,IN_ACCESS)
(modify ,IN_MODIFY)
(attrib ,IN_ATTRIB)
(close-write ,IN_CLOSE_WRITE)
(close-no-write ,IN_CLOSE_NOWRITE)
(open ,IN_OPEN)
(moved-from ,IN_MOVED_FROM)
(moved-to ,IN_MOVED_TO)
(create ,IN_CREATE)
(delete ,IN_DELETE)
(delete-self ,IN_DELETE_SELF)
(move-self ,IN_MOVE_SELF)
(only-dir ,IN_ONLYDIR)
(dont-follow ,IN_DONT_FOLLOW)
(exclude-unlink ,IN_EXCL_UNLINK)
(is-directory ,IN_ISDIR)
(once ,IN_ONESHOT)))
(define (symbol->mask sym)
(hashq-ref symbol/mask sym))
(define (mask->symbol sym)
(hashq-ref mask/symbol sym))
(define-record-type <inotify>
(%make-inotify port buffer buffer-pointer watches)
inotify?
(port inotify-port)
(buffer inotify-buffer)
(buffer-pointer inotify-buffer-pointer)
(watches inotify-watches))
(define-record-type <inotify-watch>
(make-inotify-watch id file-name owner)
inotify-watch?
(id inotify-watch-id)
(file-name inotify-watch-file-name)
(owner inotify-watch-owner))
(define-record-type <inotify-event>
(make-inotify-event watch type cookie file-name)
inotify-event?
(watch inotify-event-watch)
(type inotify-event-type)
(cookie inotify-event-cookie)
(file-name inotify-event-file-name))
(define (display-inotify inotify port)
(format port "#<inotify port: ~a>" (inotify-port inotify)))
(define (display-inotify-watch watch port)
(format port "#<inotify-watch id: ~d file-name: ~a>"
(inotify-watch-id watch)
(inotify-watch-file-name watch)))
(define (display-inotify-event event port)
(format port "#<inotify-event type: ~s cookie: ~d file-name: ~a watch: ~a>"
(inotify-event-type event)
(inotify-event-cookie event)
(inotify-event-file-name event)
(inotify-event-watch event)))
(set-record-type-printer! <inotify> display-inotify)
(set-record-type-printer! <inotify-watch> display-inotify-watch)
(set-record-type-printer! <inotify-event> display-inotify-event)
(define (make-inotify)
(let ((fd (inotify-init))
(buffer (make-bytevector 4096)))
(%make-inotify (fdopen fd "r")
buffer
(bytevector->pointer buffer)
(make-hash-table))))
(define (inotify-fd inotify)
(port->fdes (inotify-port inotify)))
(define (absolute-file-name file-name)
(if (absolute-file-name? file-name)
file-name
(string-append (getcwd) "/" file-name)))
(define (inotify-add-watch! inotify file-name modes)
(let* ((abs-file-name (absolute-file-name file-name))
(wd (inotify-add-watch (inotify-fd inotify)
(string->pointer abs-file-name)
(apply logior (map symbol->mask modes))))
(watch (make-inotify-watch wd abs-file-name inotify)))
(hashv-set! (inotify-watches inotify) wd watch)
watch))
(define (inotify-watch-remove! watch)
(inotify-rm-watch (inotify-fd (inotify-watch-owner watch))
(inotify-watch-id watch))
(hashv-remove! (inotify-watches (inotify-watch-owner watch))
(inotify-watch-id watch)))
(define (inotify-pending-events? inotify)
(char-ready? (inotify-port inotify)))
(define (read-int port buffer)
(get-bytevector-n! port buffer 0 (sizeof int))
(bytevector-sint-ref buffer 0 (native-endianness) (sizeof int)))
(define (read-uint32 port buffer)
(get-bytevector-n! port buffer 0 (sizeof uint32))
(bytevector-uint-ref buffer 0 (native-endianness) (sizeof uint32)))
(define (read-string port buffer buffer-pointer length)
(and (> length 0)
(begin
(get-bytevector-n! port buffer 0 length)
(pointer->string buffer-pointer))))
(define (inotify-read-event inotify)
(let* ((port (inotify-port inotify))
(buffer (inotify-buffer inotify))
(wd (read-int port buffer))
(event-mask (read-uint32 port buffer))
(cookie (read-uint32 port buffer))
(len (read-uint32 port buffer))
(name (read-string port buffer (inotify-buffer-pointer inotify) len)))
(make-inotify-event (hashv-ref (inotify-watches inotify) wd)
(mask->symbol event-mask) cookie name)))
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