[O] bug#26467: 25.2; [Org mode] Call dot babel from elisp generate invalid image

[Glenn Morris]

Reassigned to org-mode.

wang jinjian wrote:

> Use case is call dot babel from elisp code block. refer to
> http://orgmode.org/worg/org-tutorials/org-dot-diagrams.html
>
> Below is a more minimal example:
>
> #+NAME: nodes
> | From | To | Weight |
> |------+----+--------|
> | A    | B  |      3 |
> | A    | C  |      2 |
> | B    | D  |      4 |
> | B    | E  |      5 |
> | C    | F  |     10 |
>
> #+BEGIN_SRC elisp :file a.png :var nodes=nodes
>     (defun rowfun(x)
>         (format "%s -> %s [label=%s];" (nth 0 x) (nth 1 x) (nth 2 x))
>         )
>       (defun dotgen(nodes)
>         (let ((dotbegin "digraph {\nnode [shape=circle]\n")
>               (dotend "\n}"))
>           (concat dotbegin
>                   (mapconcat #'rowfun nodes "\n")
>                   dotend)))
> (setq params (nth 2 (org-babel-get-src-block-info)))
>   (org-babel-execute:dot (dotgen nodes) params)
> #+END_SRC
>
> If run this block with C-c C-c, it will generate a image a.png with
> "nil" string in it. so it's a invalid image file.
>
> The issue is introduced by below commit:
>
> 041ca4b6f ob-core: Do not return results on writing to file
>
> After revert this commit, it works fine. Sounds like this change will
> cause the function return "nil" string but not nil variable.
>
> Another probelm is the params variable is void in org 9.0.5. but we can
> replace it with (nth 2 (org-babel-get-src-block-info)) as my example
> code.
>
> BRs
> J.J. Wang
>
> In GNU Emacs 25.2.1 (x86_64-apple-darwin16.0.0, NS appkit-1504.00 Version
> 10.12 (Build 16A323))
> of 2017-04-03 built on e12714-mac01
> Windowing system distributor 'Apple', version 10.3.1504
> Configured using:
> 'configure --disable-dependency-tracking --disable-silent-rules
> --enable-locallisppath=/usr/local/share/emacs/site-lisp
> --infodir=/usr/local/Cellar/emacs/25.2-rc2/share/info/emacs
> --prefix=/usr/local/Cellar/emacs/25.2-rc2 --without-x --with-xml2
> --with-dbus --with-gnutls --with-imagemagick --with-rsvg --without-pop
> --with-ns --disable-ns-self-contained'
>
> Configured features:
> JPEG RSVG IMAGEMAGICK DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB
> TOOLKIT_SCROLL_BARS NS
>
> Important settings:
>   value of $LC_CTYPE: en_US.UTF-8
>   value of $LANG: en_US.UTF-8
>   locale-coding-system: utf-8-unix
>
> Major mode: Org
>
> Minor modes in effect:
>   diff-auto-refine-mode: t
>   org-indent-mode: t
>   helm-mode: t
>   shell-dirtrack-mode: t
>   async-bytecomp-package-mode: t
>   yas-global-mode: t
>   yas-minor-mode: t
>   global-company-mode: t
>   company-mode: t
>   override-global-mode: t
>   show-paren-mode: t
>   tooltip-mode: t
>   global-eldoc-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   blink-cursor-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   line-number-mode: t
>   auto-fill-function: yas--auto-fill
>   transient-mark-mode: t
>
> Recent messages:
> Code block evaluation complete.
> Edebug: org-babel-result-cond
> org-babel-result-cond
> executing Elisp code block...
>
> (nodes (quote (("A" "B" 3) ("A" "C" 2) ("B" "D" 4) ("B" "E" 5) ("C" "F"
> 10))))
>
> Wrote
> /var/folders/r0/58rd7gbs3pz3gsj48zdv8pwn00n31m/T/babel-30327L5l/ob-input-30327wiQ
> Code block evaluation complete.
> Mark set [2 times]
> Quit
>
> Load-path shadows:
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>
> Features:
> (shadow sort mail-extr emacsbug message rfc822 mml mml-sec epg mm-decode
> mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
> sendmail rfc2047 rfc2045 ietf-drums mail-utils ido helm-command
> helm-elisp helm-eval edebug misearch multi-isearch vc-git diff-mode
> winner org-table company-ispell ispell org-indent image-file org-rmail
> org-mhe org-irc org-info org-gnus org-docview doc-view jka-compr
> image-mode org-bibtex bibtex org-bbdb org-w3m company-oddmuse
> company-keywords company-etags etags xref project company-gtags
> company-dabbrev-code company-dabbrev company-files company-capf
> company-cmake company-xcode company-clang company-semantic company-eclim
> company-template company-css company-nxml company-bbdb ob-latex ob-C
> cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
> cc-vars cc-defs ob-calc calc-store calc-trail calc-ext calc
> calc-loaddefs calc-macs ob-dot ob-plantuml ob-python org-crypt ox-gfm
> ox-md ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util
> rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
> ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree
> org org-macro org-footnote org-pcomplete org-list org-faces org-entities
> noutline outline org-version ob-emacs-lisp ob ob-tangle org-src ob-ref
> ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval org-compat
> org-macs org-loaddefs find-func cal-menu calendar cal-loaddefs
> setup-helm-gtags helm-gtags subr-x pulse which-func imenu setup-helm
> helm-projectile projectile grep ibuf-ext ibuffer helm-mode helm-files rx
> image-dired tramp tramp-compat tramp-loaddefs trampver shell pcomplete
> format-spec dired-x dired-aux ffap thingatpt helm-buffers helm-elscreen
> helm-tags helm-bookmark helm-adaptive helm-info bookmark pp helm-locate
> helm-external helm-net browse-url xml url url-proxy url-privacy
> url-expand url-methods url-history url-cookie url-domsuf url-util
> url-parse auth-source gnus-util mm-util help-fns mail-prsvr
> password-cache url-vars mailcap helm-types helm-grep helm-regexp
> helm-utils compile comint ansi-color ring helm-help helm helm-source
> eieio-compat eieio eieio-core helm-multi-match helm-config helm-easymenu
> cl-macs async-bytecomp advice async helm-lib dired cl-seq yasnippet
> init-company-mode lazy-set-key company use-package diminish bind-key
> easy-mmode paren manoj-dark-theme misterioso-theme edmacro kmacro
> finder-inf info package epg-config seq byte-opt gv bytecomp byte-compile
> cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib time-date
> mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
> lisp-float-type mwheel ns-win ucs-normalize term/common-win tool-bar dnd
> fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
> lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
> scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
> cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
> tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
> slovak czech european ethiopic indian cyrillic chinese charscript
> case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
> cl-preloaded nadvice loaddefs button faces cus-face macroexp files
> text-properties overlay sha1 md5 base64 format env code-pages mule
> custom widget hashtable-print-readable backquote dbusbind kqueue cocoa
> ns multi-tty make-network-process emacs)
>
> Memory information:
> ((conses 16 550219 22768)
> (symbols 48 48191 0)
> (miscs 40 216 1037)
> (strings 32 125351 17559)
> (string-bytes 1 3803442)
> (vectors 16 73192)
> (vector-slots 8 1151281 9870)
> (floats 8 921 370)
> (intervals 56 1485 323)
> (buffers 976 25))