Change in ox export for #+DATE keywords

Change in ox export for #+DATE keywords

[Alex Bennée]

Hi,

I've been using org-mode as a source for my presentations but exporting
broke today following an ELPA update. It seems the line:

#+DATE: KVM Forum 2015

Is no longer acceptable. I think this changed as of:

ae9db17482a183e5613428c3abf1c691f86b4ac0

I'm not quite sure what the new "parse" is expecting. If I change it to
a datestamp I see breakage on other lines like the title:

apply: Wrong type argument: listp, #("My presentation title" 0 26 (:parent (#0)))

So what form am I meant to be using for these options and why the change?

-- 
Alex Bennée

Re: Change in ox export for #+DATE keywords

[Peter Salazar]

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As I mentioned, I'm getting that same error, not just with #+DATE but also
with #+TITLE, #+AUTHOR, etc. Any one of these is sufficient to break export
for me.

On Fri, Aug 7, 2015 at 3:59 PM, Alex Bennée <alex.bennee@linaro.org> wrote:

> Hi,
>
> I've been using org-mode as a source for my presentations but exporting
> broke today following an ELPA update. It seems the line:
>
> #+DATE: KVM Forum 2015
>
> Is no longer acceptable. I think this changed as of:
>
> ae9db17482a183e5613428c3abf1c691f86b4ac0
>
> I'm not quite sure what the new "parse" is expecting. If I change it to
> a datestamp I see breakage on other lines like the title:
>
> apply: Wrong type argument: listp, #("My presentation title" 0 26 (:parent
> (#0)))
>
> So what form am I meant to be using for these options and why the change?
>
> --
> Alex Bennée
>
>

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Re: Change in ox export for #+DATE keywords

[Alex Bennée]

Peter Salazar <cycleofsong@gmail.com> writes:

> As I mentioned, I'm getting that same error, not just with #+DATE but also
> with #+TITLE, #+AUTHOR, etc. Any one of these is sufficient to break export
> for me.

Yeah further poking has shown they have all broken. I can't quite follow
the logic of the patch as to what the new parse is expecting.

>
> On Fri, Aug 7, 2015 at 3:59 PM, Alex Bennée <alex.bennee@linaro.org> wrote:
>
>> Hi,
>>
>> I've been using org-mode as a source for my presentations but exporting
>> broke today following an ELPA update. It seems the line:
>>
>> #+DATE: KVM Forum 2015
>>
>> Is no longer acceptable. I think this changed as of:
>>
>> ae9db17482a183e5613428c3abf1c691f86b4ac0
>>
>> I'm not quite sure what the new "parse" is expecting. If I change it to
>> a datestamp I see breakage on other lines like the title:
>>
>> apply: Wrong type argument: listp, #("My presentation title" 0 26 (:parent
>> (#0)))
>>
>> So what form am I meant to be using for these options and why the change?
>>
>> --
>> Alex Bennée
>>
>>

-- 
Alex Bennée

Re: Change in ox export for #+DATE keywords

[Nicolas Goaziou]

Hello,

Alex Bennée <alex.bennee@linaro.org> writes:

> I've been using org-mode as a source for my presentations but exporting
> broke today following an ELPA update. It seems the line:
>
> #+DATE: KVM Forum 2015
>
> Is no longer acceptable.

FWIW, I export it without an error. Do you use a custom export back-end?


Regards,

-- 
Nicolas Goaziou

Re: Change in ox export for #+DATE keywords

[Alex Bennée]

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Hello,
>
> Alex Bennée <alex.bennee@linaro.org> writes:
>
>> I've been using org-mode as a source for my presentations but exporting
>> broke today following an ELPA update. It seems the line:
>>
>> #+DATE: KVM Forum 2015
>>
>> Is no longer acceptable.
>
> FWIW, I export it without an error. Do you use a custom export
> back-end?

I'm using ox-reveal (for Reveal.js). I'm finding it hard to trigger an
actual backtrace so maybe the problem is there.

>
>
> Regards,

-- 
Alex Bennée

Re: Change in ox export for #+DATE keywords

[Nicolas Goaziou]

Alex Bennée <alex.bennee@linaro.org> writes:

> Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:
>
>> Hello,
>>
>> Alex Bennée <alex.bennee@linaro.org> writes:
>>
>>> I've been using org-mode as a source for my presentations but exporting
>>> broke today following an ELPA update. It seems the line:
>>>
>>> #+DATE: KVM Forum 2015
>>>
>>> Is no longer acceptable.
>>
>> FWIW, I export it without an error. Do you use a custom export
>> back-end?
>
> I'm using ox-reveal (for Reveal.js). I'm finding it hard to trigger an
> actual backtrace so maybe the problem is there.

I've had a cursory look at ox-reveal.el[fn:1]. There is a strange thing,
indeed. In `org-reveal-template', line 888, (plist-get info :author)
should be wrapped within (org-export-data ...).

However, it is not related to your error. Therefore, I suspect an
installation problem on your side.

Regards,

[fn:1] https://github.com/yjwen/org-reveal/blob/master/ox-reveal.el 

Re: Change in ox export for #+DATE keywords

[Alex Bennée]

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Alex Bennée <alex.bennee@linaro.org> writes:
>
>> Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:
>>
>>> Hello,
>>>
>>> Alex Bennée <alex.bennee@linaro.org> writes:
>>>
>>>> I've been using org-mode as a source for my presentations but exporting
>>>> broke today following an ELPA update. It seems the line:
>>>>
>>>> #+DATE: KVM Forum 2015
>>>>
>>>> Is no longer acceptable.
>>>
>>> FWIW, I export it without an error. Do you use a custom export
>>> back-end?
>>
>> I'm using ox-reveal (for Reveal.js). I'm finding it hard to trigger an
>> actual backtrace so maybe the problem is there.
>
> I've had a cursory look at ox-reveal.el[fn:1]. There is a strange thing,
> indeed. In `org-reveal-template', line 888, (plist-get info :author)
> should be wrapped within (org-export-data ...).
>
> However, it is not related to your error. Therefore, I suspect an
> installation problem on your side.

I've tried re-building all my elpa packages as well as doing a plaing
HTML export and I can now get a backtrace:

Debugger entered--Lisp error: (wrong-type-argument listp #("Towards multi-threaded TCG" 0 26 (:parent (#1))))
  org-element-set-contents(#("Towards multi-threaded TCG" 0 26 (:parent (#0))))
  apply(org-element-set-contents #("Towards multi-threaded TCG" 0 26 (:parent (#0))) nil)
  #[(s) "\b\306\307\310\b#\x1a\311\312	\211:\204\0\313\202\"\v@9\203!\vAA\202\"\v)\"\210\314\315\n	\211:\2043\313\202@\v@9\203?\vAA\202@\v)#\210	\316\211\n\x1c\v;\203V\317\320\f\v#\202\\\321\vA@\f\"*\x1c\211;\203n\322\v\313\f$\202z\vA\323\vA@\f#\240\210\v+\210\nA	A@\240\210\n	@\240*\207" [s new old element property value replace-regexp-in-string "\n" " " mapc #[(blob) "\b\305	^[\211;\203\0\306\f\307\v\n$\202 \fA\310\fA@\v\n#\240\210\f+\207" [blob old value property element :parent org-add-props nil plist-put] 6] nil apply org-element-set-contents :parent get-text-property 0 plist-get org-add-props plist-put] 6](#("Towards multi-threaded TCG" 0 26 (:parent (#0))))
  #[(--data) "\b\211:\204\0	;\205\0\306\202\0	@9\205\0	@)\b?\206\337\v\203,\b\307\v\310\">\206\337\n\2047\311\f\b\"\202\337\n\312=\203\\\311\f\b\211:\204J\313\202W	@9\203V	AA\202W	)\"\202\337\n>\203\202\x0e\b!\211\x15\203\201\x0e\203z\314\315\x15\"\210\202\201\x0e\x0eB\x17)\x18\316=\203\312\b;\204\312\n\x19\236A\313\x1a\211^[\203\311\x0e@\x1a\f\x1a\b\x1e	;\203\266\317\320\x1c	#\202\275\307	A@\x1c\"*!\210^[A\211^[\204\234*\x1d\203\202\x0e\316=\203\202\n\x1e>\203\202\x0e\x1f\313 \211^[\203\201\x0e@\211 @ A\b\x1e	;\203\x01\317\320\x1c	#\202\v\307	A@\x1c\"*!\"!\203w\x0e\"#\235\203_\x0e\"$\235\203P\321!!\313%\211^[\203L\x0e@%\f%A!\210\f%@!\210^[A\211^[\2042*\202w\f!A!\210\f!@!\210\202w\x0e\"$\235\203r\311\f\321!!\"\210\202w\f!!\210*^[A\211^[\204\350*\n&>\206\337\b\211:\204\224\313\202\241	@9\203\240	AA\202\241	)?\206\337\x0e\322=\203\265\n'>?\206\337\x0e\323=\203\303\n(>\206\337\311\f\b\211:\204\320\313\202\335	@9\203\334	AA\202\335	)\")\207" [--data element --type info --walk-tree types plain-text plist-get :ignore-list mapc org-data nil throw --map-first-match objects get-text-property 0 reverse greater-elements elements fun result first-match --acc --category org-element-secondary-value-alist p --dolist-tail-- property with-affiliated org-element-all-elements org-element--parsed-properties-alist kwd-pair value kwd org-element-dual-keywords org-element-multiple-keywords line no-recursion org-element-greater-elements org-element-all-objects] 6](#("Towards multi-threaded TCG" 0 26 (:parent (#0))))
  mapc(#[(--data) "\b\211:\204\0	;\205\0\306\202\0	@9\205\0	@)\b?\206\337\v\203,\b\307\v\310\">\206\337\n\2047\311\f\b\"\202\337\n\312=\203\\\311\f\b\211:\204J\313\202W	@9\203V	AA\202W	)\"\202\337\n>\203\202\x0e\b!\211\x15\203\201\x0e\203z\314\315\x15\"\210\202\201\x0e\x0eB\x17)\x18\316=\203\312\b;\204\312\n\x19\236A\313\x1a\211^[\203\311\x0e@\x1a\f\x1a\b\x1e	;\203\266\317\320\x1c	#\202\275\307	A@\x1c\"*!\210^[A\211^[\204\234*\x1d\203\202\x0e\316=\203\202\n\x1e>\203\202\x0e\x1f\313 \211^[\203\201\x0e@\211 @ A\b\x1e	;\203\x01\317\320\x1c	#\202\v\307	A@\x1c\"*!\"!\203w\x0e\"#\235\203_\x0e\"$\235\203P\321!!\313%\211^[\203L\x0e@%\f%A!\210\f%@!\210^[A\211^[\2042*\202w\f!A!\210\f!@!\210\202w\x0e\"$\235\203r\311\f\321!!\"\210\202w\f!!\210*^[A\211^[\204\350*\n&>\206\337\b\211:\204\224\313\202\241	@9\203\240	AA\202\241	)?\206\337\x0e\322=\203\265\n'>?\206\337\x0e\323=\203\303\n(>\206\337\311\f\b\211:\204\320\313\202\335	@9\203\334	AA\202\335	)\")\207" [--data element --type info --walk-tree types plain-text plist-get :ignore-list mapc org-data nil throw --map-first-match objects get-text-property 0 reverse greater-elements elements fun result first-match --acc --category org-element-secondary-value-alist p --dolist-tail-- property with-affiliated org-element-all-elements org-element--parsed-properties-alist kwd-pair value kwd org-element-dual-keywords org-element-multiple-keywords line no-recursion org-element-greater-elements org-element-all-objects] 6] (#("Towards multi-threaded TCG" 0 26 (:parent #0))))
  #[(--data) "\b\211:\204\0	;\205\0\306\202\0	@9\205\0	@)\b?\206\337\v\203,\b\307\v\310\">\206\337\n\2047\311\f\b\"\202\337\n\312=\203\\\311\f\b\211:\204J\313\202W	@9\203V	AA\202W	)\"\202\337\n>\203\202\x0e\b!\211\x15\203\201\x0e\203z\314\315\x15\"\210\202\201\x0e\x0eB\x17)\x18\316=\203\312\b;\204\312\n\x19\236A\313\x1a\211^[\203\311\x0e@\x1a\f\x1a\b\x1e	;\203\266\317\320\x1c	#\202\275\307	A@\x1c\"*!\210^[A\211^[\204\234*\x1d\203\202\x0e\316=\203\202\n\x1e>\203\202\x0e\x1f\313 \211^[\203\201\x0e@\211 @ A\b\x1e	;\203\x01\317\320\x1c	#\202\v\307	A@\x1c\"*!\"!\203w\x0e\"#\235\203_\x0e\"$\235\203P\321!!\313%\211^[\203L\x0e@%\f%A!\210\f%@!\210^[A\211^[\2042*\202w\f!A!\210\f!@!\210\202w\x0e\"$\235\203r\311\f\321!!\"\210\202w\f!!\210*^[A\211^[\204\350*\n&>\206\337\b\211:\204\224\313\202\241	@9\203\240	AA\202\241	)?\206\337\x0e\322=\203\265\n'>?\206\337\x0e\323=\203\303\n(>\206\337\311\f\b\211:\204\320\313\202\335	@9\203\334	AA\202\335	)\")\207" [--data element --type info --walk-tree types plain-text plist-get :ignore-list mapc org-data nil throw --map-first-match objects get-text-property 0 reverse greater-elements elements fun result first-match --acc --category org-element-secondary-value-alist p --dolist-tail-- property with-affiliated org-element-all-elements org-element--parsed-properties-alist kwd-pair value kwd org-element-dual-keywords org-element-multiple-keywords line no-recursion org-element-greater-elements org-element-all-objects] 6]((#("Towards multi-threaded TCG" 0 26 (:parent #0))))
  byte-code("\b	!\210\n\237\207" [--walk-tree data --acc] 2)
  org-element-map((#("Towards multi-threaded TCG" 0 26 (:parent #0))) plain-text #[(s) "\b\306\307\310\b#\x1a\311\312	\211:\204\0\313\202\"\v@9\203!\vAA\202\"\v)\"\210\314\315\n	\211:\2043\313\202@\v@9\203?\vAA\202@\v)#\210	\316\211\n\x1c\v;\203V\317\320\f\v#\202\\\321\vA@\f\"*\x1c\211;\203n\322\v\313\f$\202z\vA\323\vA@\f#\240\210\v+\210\nA	A@\240\210\n	@\240*\207" [s new old element property value replace-regexp-in-string "\n" " " mapc #[(blob) "\b\305	^[\211;\203\0\306\f\307\v\n$\202 \fA\310\fA@\v\n#\240\210\f+\207" [blob old value property element :parent org-add-props nil plist-put] 6] nil apply org-element-set-contents :parent get-text-property 0 plist-get org-add-props plist-put] 6])
  org-export--get-inbuffer-options([cl-struct-org-export-backend reveal html ((export-block . org-reveal-export-block) (headline . org-reveal-headline) (inner-template . org-reveal-inner-template) (item . org-reveal-item) (keyword . org-reveal-keyword) (plain-list . org-reveal-plain-list) (paragraph . org-reveal-paragraph) (quote-block . org-reveal-quote-block) (section . org-reveal-section) (src-block . org-reveal-src-block) (template . org-reveal-template)) ((:reveal-control nil "reveal_control" org-reveal-control t) (:reveal-progress nil "reveal_progress" org-reveal-progress t) (:reveal-history nil "reveal_history" org-reveal-history t) (:reveal-center nil "reveal_center" org-reveal-center t) (:reveal-rolling-links nil "reveal_rolling_links" org-reveal-rolling-links t) (:reveal-slide-number nil "reveal_slide_number" org-reveal-slide-number t) (:reveal-keyboard nil "reveal_keyboard" org-reveal-keyboard t) (:reveal-overview nil "reveal_overview" org-reveal-overview t) (:reveal-width nil "reveal_width" org-reveal-width t) (:reveal-height nil "reveal_height" org-reveal-height) (:reveal-margin "REVEAL_MARGIN" nil org-reveal-margin t) (:reveal-min-scale "REVEAL_MIN_SCALE" nil org-reveal-min-scale t) (:reveal-max-scale "REVEAL_MAX_SCALE" nil org-reveal-max-scale t) (:reveal-root "REVEAL_ROOT" nil org-reveal-root t) (:reveal-trans "REVEAL_TRANS" nil org-reveal-transition t) (:reveal-speed "REVEAL_SPEED" nil org-reveal-transition-speed t) (:reveal-theme "REVEAL_THEME" nil org-reveal-theme t) (:reveal-extra-css "REVEAL_EXTRA_CSS" nil nil nil) (:reveal-extra-js "REVEAL_EXTRA_JS" nil org-reveal-extra-js nil) (:reveal-hlevel "REVEAL_HLEVEL" nil nil t) (:reveal-title-slide nil "reveal_title_slide" org-reveal-title-slide t) (:reveal-title-slide-template "REVEAL_TITLE_SLIDE_TEMPLATE" nil org-reveal-title-slide-template t) (:reveal-title-slide-background "REVEAL_TITLE_SLIDE_BACKGROUND" nil nil t) (:reveal-title-slide-background-size "REVEAL_TITLE_SLIDE_BACKGROUND_SIZE" nil nil t) (:reveal-title-slide-background-repeat "REVEAL_TITLE_SLIDE_BACKGROUND_REPEAT" nil nil t) (:reveal-title-slide-background-transition "REVEAL_TITLE_SLIDE_BACKGROUND_TRANSITION" nil nil t) (:reveal-mathjax nil "reveal_mathjax" org-reveal-mathjax t) (:reveal-mathjax-url "REVEAL_MATHJAX_URL" nil org-reveal-mathjax-url t) (:reveal-preamble "REVEAL_PREAMBLE" nil org-reveal-preamble t) (:reveal-head-preamble "REVEAL_HEAD_PREAMBLE" nil org-reveal-head-preamble t) (:reveal-postamble "REVEAL_POSTAMBLE" nil org-reveal-postamble t) (:reveal-multiplex-id "REVEAL_MULTIPLEX_ID" nil org-reveal-multiplex-id nil) (:reveal-multiplex-secret "REVEAL_MULTIPLEX_SECRET" nil org-reveal-multiplex-secret nil) (:reveal-multiplex-url "REVEAL_MULTIPLEX_URL" nil org-reveal-multiplex-url nil) (:reveal-multiplex-socketio-url "REVEAL_MULTIPLEX_SOCKETIO_URL" nil org-reveal-multiplex-socketio-url nil) (:reveal-slide-header "REVEAL_SLIDE_HEADER" nil org-reveal-slide-header t) (:reveal-slide-footer "REVEAL_SLIDE_FOOTER" nil org-reveal-slide-footer t) (:reveal-plugins "REVEAL_PLUGINS" nil nil t) (:reveal-default-frag-style "REVEAL_DEFAULT_FRAG_STYLE" nil org-reveal-default-frag-style t)) ((:filter-parse-tree . org-reveal-filter-parse-tree)) ("REVEAL" "NOTES") (82 "Export to reveal.js HTML Presentation" ((82 "To file" org-reveal-export-to-html) (66 "To file and Browse" org-reveal-export-to-html-and-browse)))])
  org-export-get-environment([cl-struct-org-export-backend reveal html ((export-block . org-reveal-export-block) (headline . org-reveal-headline) (inner-template . org-reveal-inner-template) (item . org-reveal-item) (keyword . org-reveal-keyword) (plain-list . org-reveal-plain-list) (paragraph . org-reveal-paragraph) (quote-block . org-reveal-quote-block) (section . org-reveal-section) (src-block . org-reveal-src-block) (template . org-reveal-template)) ((:reveal-control nil "reveal_control" org-reveal-control t) (:reveal-progress nil "reveal_progress" org-reveal-progress t) (:reveal-history nil "reveal_history" org-reveal-history t) (:reveal-center nil "reveal_center" org-reveal-center t) (:reveal-rolling-links nil "reveal_rolling_links" org-reveal-rolling-links t) (:reveal-slide-number nil "reveal_slide_number" org-reveal-slide-number t) (:reveal-keyboard nil "reveal_keyboard" org-reveal-keyboard t) (:reveal-overview nil "reveal_overview" org-reveal-overview t) (:reveal-width nil "reveal_width" org-reveal-width t) (:reveal-height nil "reveal_height" org-reveal-height) (:reveal-margin "REVEAL_MARGIN" nil org-reveal-margin t) (:reveal-min-scale "REVEAL_MIN_SCALE" nil org-reveal-min-scale t) (:reveal-max-scale "REVEAL_MAX_SCALE" nil org-reveal-max-scale t) (:reveal-root "REVEAL_ROOT" nil org-reveal-root t) (:reveal-trans "REVEAL_TRANS" nil org-reveal-transition t) (:reveal-speed "REVEAL_SPEED" nil org-reveal-transition-speed t) (:reveal-theme "REVEAL_THEME" nil org-reveal-theme t) (:reveal-extra-css "REVEAL_EXTRA_CSS" nil nil nil) (:reveal-extra-js "REVEAL_EXTRA_JS" nil org-reveal-extra-js nil) (:reveal-hlevel "REVEAL_HLEVEL" nil nil t) (:reveal-title-slide nil "reveal_title_slide" org-reveal-title-slide t) (:reveal-title-slide-template "REVEAL_TITLE_SLIDE_TEMPLATE" nil org-reveal-title-slide-template t) (:reveal-title-slide-background "REVEAL_TITLE_SLIDE_BACKGROUND" nil nil t) (:reveal-title-slide-background-size "REVEAL_TITLE_SLIDE_BACKGROUND_SIZE" nil nil t) (:reveal-title-slide-background-repeat "REVEAL_TITLE_SLIDE_BACKGROUND_REPEAT" nil nil t) (:reveal-title-slide-background-transition "REVEAL_TITLE_SLIDE_BACKGROUND_TRANSITION" nil nil t) (:reveal-mathjax nil "reveal_mathjax" org-reveal-mathjax t) (:reveal-mathjax-url "REVEAL_MATHJAX_URL" nil org-reveal-mathjax-url t) (:reveal-preamble "REVEAL_PREAMBLE" nil org-reveal-preamble t) (:reveal-head-preamble "REVEAL_HEAD_PREAMBLE" nil org-reveal-head-preamble t) (:reveal-postamble "REVEAL_POSTAMBLE" nil org-reveal-postamble t) (:reveal-multiplex-id "REVEAL_MULTIPLEX_ID" nil org-reveal-multiplex-id nil) (:reveal-multiplex-secret "REVEAL_MULTIPLEX_SECRET" nil org-reveal-multiplex-secret nil) (:reveal-multiplex-url "REVEAL_MULTIPLEX_URL" nil org-reveal-multiplex-url nil) (:reveal-multiplex-socketio-url "REVEAL_MULTIPLEX_SOCKETIO_URL" nil org-reveal-multiplex-socketio-url nil) (:reveal-slide-header "REVEAL_SLIDE_HEADER" nil org-reveal-slide-header t) (:reveal-slide-footer "REVEAL_SLIDE_FOOTER" nil org-reveal-slide-footer t) (:reveal-plugins "REVEAL_PLUGINS" nil nil t) (:reveal-default-frag-style "REVEAL_DEFAULT_FRAG_STYLE" nil org-reveal-default-frag-style t)) ((:filter-parse-tree . org-reveal-filter-parse-tree)) ("REVEAL" "NOTES") (82 "Export to reveal.js HTML Presentation" ((82 "To file" org-reveal-export-to-html) (66 "To file and Browse" org-reveal-export-to-html-and-browse)))] nil (:output-file "./towards-multithreaded-tcg.html"))
  org-export-as(reveal nil nil nil (:output-file "./towards-multithreaded-tcg.html"))
  org-export-to-file(reveal "./towards-multithreaded-tcg.html" nil nil nil nil nil)
  org-reveal-export-to-html(nil nil nil nil)
  org-export-dispatch(nil)
  call-interactively(org-export-dispatch nil nil)
  command-execute(org-export-dispatch)

But with all the byte code its very hard to follow :-/

I shall poke some more.


>
> Regards,
>
> [fn:1] https://github.com/yjwen/org-reveal/blob/master/ox-reveal.el 

-- 
Alex Bennée

Re: Change in ox export for #+DATE keywords

[Alex Bennée]

Alex Bennée <alex.bennee@linaro.org> writes:

> Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:
>
>> Alex Bennée <alex.bennee@linaro.org> writes:
>>
>>> Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:
<snip>
>>>> FWIW, I export it without an error. Do you use a custom export
>>>> back-end?
>>>
>>> I'm using ox-reveal (for Reveal.js). I'm finding it hard to trigger an
>>> actual backtrace so maybe the problem is there.
>>
>> I've had a cursory look at ox-reveal.el[fn:1]. There is a strange thing,
>> indeed. In `org-reveal-template', line 888, (plist-get info :author)
>> should be wrapped within (org-export-data ...).
>>
>> However, it is not related to your error. Therefore, I suspect an
>> installation problem on your side.
>
> I've tried re-building all my elpa packages as well as doing a plaing
> HTML export and I can now get a backtrace:
>
<snip>

OK ignore that. If I do a -q -l mininit.el I get a more useful backtrace
that reveals problems with ox-reveal.el which I can address.

-- 
Alex Bennée