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improved play-sound for unix

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svn: r5802
This commit is contained in:
Eli Barzilay 2007-03-20 21:32:49 +00:00
parent 107adbd273
commit 162962d668
1 changed files with 69 additions and 28 deletions
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93
collects/mred/private/misc.ss
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@ -52,37 +52,78 @@
(define (hide-cursor-until-moved)
(wx:hide-cursor))
(define unix-play-command
(delay
(let* (;; check user-set preference first
;; (can be a string with `~a', or a name of an executable)
[cmd (get-preference '|MrEd:playcmd| (lambda () #f))]
[cmd (cond [(not (string? cmd)) #f]
[(regexp-match? #rx"~[aA]" cmd) cmd]
[(find-executable-path cmd) => values]
;; maybe there are some redundant spaces?
[(regexp-match #rx"^ *([^ ].*?) *$" cmd)
=> (lambda (m) (find-executable-path (cadr m)))]
;; bad setting: no ~a, and does not name an executable
[else #f])]
;; no setting => search for some known commands
[cmd (or cmd
(ormap find-executable-path
'("aplay" "play" "esdplay" "sndfile-play"
"audioplay"))
(error 'play-sound
"not supported on this machine ~a"
"(no default, and no known command found)"))]
[>null (open-output-file "/dev/null" 'append)]
[<null (open-input-file "/dev/null")]
[bufsize 500]) ; maximum number of chars from stderr that we show
(lambda (f async?)
(define file (path->string (expand-path f)))
;; if find-executable-path was used, then cmd is a path, otherwise
;; it's a string with `~a'.
(define cmd+args
(if (path? cmd)
(list cmd file)
(list "/bin/sh" "-c"
(format cmd (string-append "\""
(regexp-replace*
#rx"([$\"\\])" file "\\\\\\1")
"\"")))))
(define-values (p pout pin perr)
(apply subprocess >null <null #f cmd+args))
(define buf (make-bytes bufsize))
(define (follow)
;; buf holds the tail (`bufsize' chars) of the error output
(let loop ([i 0] [full? #f])
(let ([n (read-bytes! buf perr i)])
(cond
[(eof-object? n)
(let ([c (begin (subprocess-wait p) (subprocess-status p))])
(if (zero? c)
#t ; success => don't show error output
(let ([err (current-error-port)])
(cond [full?
(display "...snip...\n")
(write-bytes buf err i)
(write-bytes buf err 0 i)]
[(> i 0)
(write-bytes buf err 0 i)])
(unless async? ; no point in an async error
(error 'play-sound
"running ~a returned an error code"
cmd+args)))))]
[(= (+ n i) bufsize) (loop 0 #t)]
[else (loop (+ n i) full?)]))))
(if async?
(begin (thread follow) #t)
(follow))))))
(define (play-sound f async?)
(unless (or (path? f) (string? f))
(raise-type-error 'play-sound "string-or-path" f))
(unless (file-exists? f)
(error 'play-sound "file not found: ~e" f))
(if (not (eq? (system-type) 'unix))
(wx:play-sound f async?)
(let* (;; check user-set preference first
[cmd (get-preference '|MrEd:playcmd| (lambda () #f))]
[cmd (if (string? cmd)
cmd
(let ([subpath (path->string (system-library-subpath))])
(cond [;; use play interface to sox
(regexp-match #rx"linux" subpath) "play ~a"]
[(regexp-match #rx"solaris" subpath) "audioplay ~a"]
[else (raise-mismatch-error
'play-sound
"not supported by default on this platform"
subpath)])))])
((if async?
(lambda (x)
(process/ports
(current-output-port) (current-input-port) (current-error-port) x)
#t)
system)
(format cmd (string-append
"\""
(regexp-replace* #rx"([$\"\\])"
(path->string (expand-path f))
"\\\\\\1")
"\""))))))
((if (eq? (system-type) 'unix) (force unix-play-command) wx:play-sound)
f async))
;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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