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mu-scm: add filename procedure for mime-part

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Dirk-Jan C. Binnema
2025-07-08 19:04:31 +03:00
parent 5fdb13fd72
commit 7b4aea432e
3 changed files with 33 additions and 14 deletions
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29
scm/mu-scm.scm
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@ -28,6 +28,7 @@
<mime-part>
mime-part->alist
make-port
filename
write-to-file
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Message
@ -159,27 +160,33 @@ If DECODE? is #t, decode the content (from e.g., base64); in that case,
CONTENT-ONLY? is implied to be #t."
(cc-mime-make-stream-port (slot-ref mime-part 'mimepart) content-only? decode?))
(define* (make-output-file mime-part #:key (filename #f) (overwrite? #f))
(define-method (filename (mime-part <mime-part>))
"Determine the file-name for MIME-part.
Either the 'filename' field in the mime-part and if that does not exist, use
'mime-part-<index>' with <index> being the number of the mime-part."
(let ((alist (mime-part->alist mime-part)))
(or (assoc-ref alist 'filename)
(format #f "mime-part-~d" (assoc-ref alist 'index)))))
(define* (make-output-file mime-part #:key (path #f) (overwrite? #f))
"Create a port for the file to write MIME-PART to.
FILENAME is the path to the file name. If not specified, use the 'filename'
PATH is file-name or path to the file name. If not specified, use the 'filename'
field in the mime-part and if that does not exist, use 'mime-part-<index>' with
<index> being the number of the mime-part.
OVERWRITE? specifies whether existing files by the same name or overwritten.
Otherwise, trying to overwrite an existing file raises an error."
(let* ((alist (mime-part->alist mime-part))
(filename (or filename
(assoc-ref alist 'filename)
(format #f "mime-part-~d" (assoc-ref alist 'index)))))
;; we need an fd-based port since we want to support overwrite?
(open filename
(logior O_WRONLY O_CREAT O_TRUNC (if overwrite? O_EXCL 0)) #o644)))
(path (or path (filename mime-part))))
;; we need an fd-based port since we want to support overwrite?
(open path
(logior O_WRONLY O_CREAT O_TRUNC (if overwrite? O_EXCL 0)) #o644)))
(define* (write-to-file mime-part #:key (filename #f) (overwrite? #f))
(define* (write-to-file mime-part #:key (path #f) (overwrite? #f))
"Write MIME-PART to a file.
FILENAME is the path to the file name. If not specified, use the 'filename'
PATH is the path/filename for the file. If not specified, use the 'filename'
field in the mime-part and if that does not exist, use 'mime-part-<index>' with
<index> being the number of the mime-part.
@ -187,7 +194,7 @@ OVERWRITE? specifies whether existing files by the same name or overwritten.
Otherwise, trying to overwrite an existing file raises an error."
(let* ((input (make-port mime-part))
(output (make-output-file mime-part
#:filename filename #:overwrite? overwrite?))
#:path path #:overwrite? overwrite?))
(buf (make-bytevector 4096)) ;; just a guess...
(bytes 0))
(while (not (eof-object? bytes)) ;; XXX do this in a more elegant way.