branch: elpa/geiser-racket
commit c9008a6e0b7fddefbcd2a937b41e83773a71f46b
Author: Michael W <[email protected]>
Commit: Michael W <[email protected]>
[WIP] Draw images inline in the Racket REPL.
On the racket side, we use a custom print handler to print
images (convertible? values; see file/convertible) in a special format:
#<Image: filename>
On the geiser side, we add a comint post-output hook to search for
that filename and replace it with inline images.
---
geiser/user.rkt | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)
diff --git a/geiser/user.rkt b/geiser/user.rkt
index c8cca24..38eefd8 100644
--- a/geiser/user.rkt
+++ b/geiser/user.rkt
@@ -14,7 +14,10 @@
(provide init-geiser-repl run-geiser-server start-geiser)
(require (for-syntax racket/base)
+ file/convertible
mzlib/thread
+ racket/file
+ racket/pretty
racket/tcp
geiser
geiser/enter
@@ -88,10 +91,30 @@
(define (geiser-prompt-read prompt)
(make-repl-reader (geiser-read prompt)))
+(define (geiser-save-tmpimage imgbytes)
+ ;; Save imgbytes to a new temporary file and return the filename
+ (define filename (make-temporary-file "geiser-img-~a.png"))
+ (with-output-to-file filename #:exists 'truncate
+ (lambda () (display imgbytes)))
+ filename)
+
+(define (geiser-maybe-print-image value)
+ (cond
+ [(and (convertible? value)
+ (convert value 'png-bytes))
+ => (lambda (pngbytes)
+ ;; (The above could be problematic if a future version of racket
+ ;; suddenly decides it can "convert" strings to picts)
+ (printf "#<Image: ~a>\n" (geiser-save-tmpimage pngbytes)))]
+ [else
+ (unless (void? value)
+ (pretty-print value))]))
+
(define (init-geiser-repl)
(compile-enforce-module-constants #f)
(current-load/use-compiled geiser-loader)
- (current-prompt-read (geiser-prompt-read geiser-prompt)))
+ (current-prompt-read (geiser-prompt-read geiser-prompt))
+ (current-print geiser-maybe-print-image))
(define (run-geiser-repl in out enforce-module-constants)
(parameterize [(compile-enforce-module-constants enforce-module-constants)
@@ -99,7 +122,8 @@
(current-output-port out)
(current-error-port out)
(current-load/use-compiled geiser-loader)
- (current-prompt-read (geiser-prompt-read geiser-prompt))]
+ (current-prompt-read (geiser-prompt-read geiser-prompt))
+ (current-print geiser-maybe-print-image)]
(read-eval-print-loop)))
(define server-channel (make-channel))
