[O] Bug: ob-scheme.el has two problems: not killing a misbehaving interpreter and sometimes returns nil [9.1.9 (release_9.1.9-65-g5e4542 @ /usr/share/emacs/26.2/lisp/org/)]

[Vladimir Nikishkin]

Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.  You don't know how to make a good report?  See

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------------------------------------------------------------------------

Hello, everyone.

I am trying to write a quasi coursework solution for SICP with org and
Chibi-scheme. Unfortunately, chibi is not very well supported in geiser
(although some evaluation features work), so I am having the following
difficulties with the following code:

#+BEGIN_SRC scheme :export both :results output :session
(import (scheme small))
(display "Hello 1\n")
t
#+END_SRC

Note that t is not a registered symbol in scheme (should be #t), but is
shows two errors:

1. The buffer "myfile.org chibi REPL" is not killed after the execution
is finished. Maybe ob-scheme tries to run some internal exit function in
the interpreter, which fails, or whatever, but I am left with a dangling
buffer. (Maybe line 184 in ob-scheme.el, kill-buffer is not doing its job?)

2. In this case, org-babel-scheme-execute-with-geiser returns nil. This
is wrong, because org-babel-reassemble-table does not expect nil as an
input. Moreover, since all of this is not exception-handled, it turns
out into a silent error.

3. In this case, the output of the interpreter is "ERROR: undefined
variable: t", printed to stderr. Geiser processes this by forwarding
back the (error . "<...> error output") cons cell, but org doesn't seem
to be using this. I mean, if I change :results to be "value", I am
getting the exception message into the org buffer, but I suspect that is
should also be displayed when ":results output" since that is what the
interpreter is actually printing.

4. Is there some legitimate way to get all three output channels of a
block of code together? By "all three" I mean, "STDOUT", "STDERR" and
the expression return value?

Cheers, everyone, thanks for your work!

Emacs  : GNU Emacs 26.2 (build 1, x86_64-slackware-linux-gnu, GTK+ Version 
3.24.10)
 of 2019-07-18
Package: Org mode version 9.1.9 (release_9.1.9-65-g5e4542 @ 
/usr/share/emacs/26.2/lisp/org/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer 
org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-babel-after-execute-hook '((lambda nil
                                 (if org-inline-image-overlays
                                  (progn (org-redisplay-inline-images)))
                                 )
                                )
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-html-format-inlinetask-function 
'org-html-format-inlinetask-default-function
 org-pretty-entities t
 org-odt-format-headline-function 'org-odt-format-headline-default-function
 org-agenda-files '("~/Personal_Planner/Planner.org")
 org-ascii-format-inlinetask-function 'org-ascii-format-inlinetask-default
 org-reveal-start-hook '(org-decrypt-entry)
 org-modules '(org-habits org-w3m org-bbdb org-bibtex org-docview org-gnus 
org-info org-irc
               org-mhe org-rmail)
 org-plantuml-jar-path "/usr/local/bin/plantuml.jar"
 org-mode-hook '((lambda nil (imenu-add-to-menubar "Imenu"))
                 #[0 "\300\301\302\303\304$\207"
                   [add-hook change-major-mode-hook org-show-block-all append 
local] 5]
                 #[0 "\300\301\302\303\304$\207"
                   [add-hook change-major-mode-hook org-babel-show-result-all 
append local] 5]
                 org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-odt-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-bibtex-headline-format-function #[257 "\300\236A\207" [:title] 3 "\n\n(fn 
ENTRY)"]
 org-latex-format-drawer-function #[514 "\207" [] 3 "\n\n(fn _ CONTENTS)"]
 org-babel-pre-tangle-hook '(save-buffer)
 org-latex-compiler "lualatex"
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe 
org-babel-header-arg-expand)
 org-babel-load-languages '((plantuml . t) (C . t) (scheme . t))
 org-log-done 'time
 org-startup-align-all-tables t
 org-ascii-format-drawer-function #[771 "\207" [] 4 "\n\n(fn NAME CONTENTS 
WIDTH)"]
 org-catch-invisible-edits t
 org-occur-hook '(org-first-headline-recenter)
 org-edit-src-auto-save-idle-delay 15
 org-agenda-include-diary t
 org-structure-template-alist '(("p" "#+begin_src plantuml :export both :file ? 
\n#+end_src ")
                                ("s" "#+BEGIN_SRC ?\n\n#+END_SRC")
                                ("e" "#+BEGIN_EXAMPLE\n?\n#+END_EXAMPLE")
                                ("q" "#+BEGIN_QUOTE\n?\n#+END_QUOTE")
                                ("v" "#+BEGIN_VERSE\n?\n#+END_VERSE")
                                ("V" "#+BEGIN_VERBATIM\n?\n#+END_VERBATIM")
                                ("c" "#+BEGIN_CENTER\n?\n#+END_CENTER")
                                ("C" "#+BEGIN_COMMENT\n?\n#+END_COMMENT")
                                ("l" "#+BEGIN_EXPORT latex\n?\n#+END_EXPORT")
                                ("L" "#+LaTeX: ")
                                ("h" "#+BEGIN_EXPORT html\n?\n#+END_EXPORT") 
("H" "#+HTML: ")
                                ("a" "#+BEGIN_EXPORT ascii\n?\n#+END_EXPORT")
                                ("A" "#+ASCII: ") ("i" "#+INDEX: ?")
                                ("I" "#+INCLUDE: %file ?"))
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
                  org-cycle-show-empty-lines 
org-optimize-window-after-visibility-change)
 org-edit-src-turn-on-auto-save t
 org-speed-command-hook '(org-speed-command-activate 
org-babel-speed-command-activate)
 org-odt-format-inlinetask-function 'org-odt-format-inlinetask-default-function
 org-babel-tangle-lang-exts '(("D" . "d") ("C++" . "cpp") ("emacs-lisp" . "el")
                              ("elisp" . "el"))
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("id" :follow org-id-open)
                       ("rmail" :follow org-rmail-open :store 
org-rmail-store-link)
                       ("mhe" :follow org-mhe-open :store org-mhe-store-link)
                       ("irc" :follow org-irc-visit :store org-irc-store-link)
                       ("info" :follow org-info-open :export org-info-export 
:store
                        org-info-store-link)
                       ("gnus" :follow org-gnus-open :store org-gnus-store-link)
                       ("docview" :follow org-docview-open :export 
org-docview-export :store
                        org-docview-store-link)
                       ("bibtex" :follow org-bibtex-open :store 
org-bibtex-store-link)
                       ("bbdb" :follow org-bbdb-open :export org-bbdb-export 
:complete
                        org-bbdb-complete-link :store org-bbdb-store-link)
                       ("w3m" :store org-w3m-store-link) ("file+sys") 
("file+emacs")
                       ("doi" :follow org--open-doi-link)
                       ("elisp" :follow org--open-elisp-link)
                       ("file" :complete org-file-complete-link)
                       ("ftp" :follow (lambda (path) (browse-url (concat "ftp:" 
path))))
                       ("help" :follow org--open-help-link)
                       ("http" :follow (lambda (path) (browse-url (concat 
"http:" path))))
                       ("https" :follow (lambda (path) (browse-url (concat 
"https:" path))))
                       ("mailto" :follow (lambda (path) (browse-url (concat 
"mailto:"; path))))
                       ("news" :follow (lambda (path) (browse-url (concat 
"news:"; path))))
                       ("shell" :follow org--open-shell-link))
 org-latex-format-headline-function 'org-latex-format-headline-default-function
 org-agenda-start-with-follow-mode t
 org-latex-format-inlinetask-function 
'org-latex-format-inlinetask-default-function
 org-html-format-drawer-function #[514 "\207" [] 3 "\n\n(fn NAME CONTENTS)"]
 org-image-actual-width nil
 org-html-use-infojs t
 org-html-format-headline-function 'org-html-format-headline-default-function
 org-confirm-babel-evaluate 'my-org-confirm-babel-evaluate
 org-use-speed-commands t
 org-latex-bib-compiler "biber"
 org-default-notes-file "~/org/notes.org"
 )
-- 
--
Vladimir Nikishkin (MiEr, lockywolf)