bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

[David Trudgett]

Reproduce:

In an Org mode file, add a #+DATE tag as follows:

#+DATE: First published: 1 February 2014

Then initiate a project publish, which publishes (by default) only
changed files. A date such as the above will not be parsed, so
ox-publish.el will always publish it, even though it has not changed.
Using instead a parsable date format (such as 2014-02-01), this date will be
recognised, and will result in the file never being published, because
it is treating the date as a modification date instead of a creation date.

Desired Behaviour:

ox-publish.el, in function ORG-PUBLISH-FIND-DATE should not be using
this date to detect modifications, as it will never change, and no
modifications will be detected for publishing.

Suggested Fix:

My suggested fix is to always use filesystem timestamp and never use the
#+DATE: line within the Org file.

I.e., change the following lines:

          (cond ((let ((ts (and (consp date) (assq 'timestamp date))))
               (and ts
                (let ((value (org-element-interpret-data ts)))
                  (and (org-string-nw-p value)
                   (org-time-string-to-time value))))))
            ((file-exists-p file)
             (file-attribute-modification-time (file-attributes file)))
            (t (error "No such file: \"%s\"" file)))))))))

to:

          (cond ((file-exists-p file)
             (file-attribute-modification-time (file-attributes file)))
            (t (error "No such file: \"%s\"" file)))))))))

System Info:

In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.22.21)
  of 2017-09-23, modified by Debian built on lgw01-amd64-050
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description:    Ubuntu 18.04.2 LTS

Configured using:
  'configure --build x86_64-linux-gnu --prefix=/usr
  --sharedstatedir=/var/lib --libexecdir=/usr/lib
  --localstatedir=/var/lib --infodir=/usr/share/info
  --mandir=/usr/share/man --with-pop=yes
  --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
  --with-sound=alsa --without-gconf --build x86_64-linux-gnu
  --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
  --localstatedir=/var/lib --infodir=/usr/share/info
  --mandir=/usr/share/man --with-pop=yes
  --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
  --with-sound=alsa --without-gconf --with-x=yes --with-x-toolkit=gtk3
  --with-toolkit-scroll-bars 'CFLAGS=-g -O2
  -fdebug-prefix-map=/build/emacs25-jYekUr/emacs25-25.2+1=.
  -fstack-protector-strong -Wformat -Werror=format-security -Wall'
  'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
  'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
   value of $LC_MONETARY: en_AU.UTF-8
   value of $LC_NUMERIC: en_AU.UTF-8
   value of $LC_TIME: en_AU.UTF-8
   value of $LANG: it_IT.UTF-8
   value of $XMODIFIERS: @im=ibus
   locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
   show-paren-mode: t
   TeX-PDF-mode: t
   yas-global-mode: t
   yas-minor-mode: t
   pdf-occur-global-minor-mode: t
   global-magit-file-mode: t
   magit-file-mode: t
   diff-auto-refine-mode: t
   magit-auto-revert-mode: t
   global-git-commit-mode: t
   shell-dirtrack-mode: t
   winner-mode: t
   rxt-global-mode: t
   rxt-mode: t
   beacon-mode: t
   override-global-mode: t
   which-key-mode: t
   helm-mode: t
   async-bytecomp-package-mode: t
   electric-pair-mode: t
   global-auto-complete-mode: t
   auto-complete-mode: t
   paredit-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
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent messages:
Resetting customization items...done
Creating customization setup...done
Saving file 
/home/david/TorahBooks/website/src/snippets/2014-02-01_parable-of-the-rich-man-and-the-beggar.org...
Wrote 
/home/david/TorahBooks/website/src/snippets/2014-02-01_parable-of-the-rich-man-and-the-beggar.org
Directory has changed on disk; type g to update Dired
Deleting...done
Quit
Mark saved where search started
Mark set
Mark saved where search started

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Features:
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-- 

David K. Trudgett
IT Systems and Software Engineer
Ph: 0467 312 782 (mobile) [intl: +61 467 312 782]
Email: David.Trudgett@eclecticse.com.au
Web: http://www.eclecticse.com.au/ (blog)
LinkedIn: https://au.linkedin.com/in/david-trudgett-6191ba103
ABN: 87 984 125 899

bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

[Nicolas Goaziou]

Hello,

David Trudgett <david.trudgett@eclecticse.com.au> writes:

> Reproduce:
>
> In an Org mode file, add a #+DATE tag as follows:
>
> #+DATE: First published: 1 February 2014
>
> Then initiate a project publish, which publishes (by default) only
> changed files. A date such as the above will not be parsed, so
> ox-publish.el will always publish it, even though it has not changed.
> Using instead a parsable date format (such as 2014-02-01), this date will be
> recognised, and will result in the file never being published, because
> it is treating the date as a modification date instead of a creation date.
>
> Desired Behaviour:
>
> ox-publish.el, in function ORG-PUBLISH-FIND-DATE should not be using
> this date to detect modifications, as it will never change, and no
> modifications will be detected for publishing.

I don't understand how you come to this conclusion. 

The function responsible for deciding if a file should be published is
`org-publish-cache-file-needs-publishing'. It doesn't call
`org-publish-find-date', but `org-publish-cache-ctime-of-src'. The
latter only uses `file-attribute-modification-time'.

IOW, I think the file is published because you modified since last
publishing.

WDYT?

Regards,

-- 
Nicolas Goaziou

bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

[Bastien]

Hi David,

after Nicolas' answer, I don't see the bug in here, so I am closing
this bug report.

If you think there is still something wrong, please test with latest
Org and report it again on emacs-orgmode@gnu.org.

Thanks,

-- 
 Bastien

Re: bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

[David Trudgett]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Thank you, Nicolas and Bastien,

Apologies for the late reply.

The publishing functionality now appears to be working as it should. I
haven't changed anything myself, except to update Org. It's possible I
misdiagnosed the cause of the problem.

In any case, should the issue arise again, I will take another look at
it and let you all know.

Thanks for your attention on this one. It's really appreciated!

Kind regards,
David

- -- 
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Re: bug#34891: 25.2; ORG-PUBLISH-FIND-DATE should not use Creation/Publish date (#+DATE:) in file as a modification timestamp.

[Bastien]

Hi David,

David Trudgett <David.Trudgett@eclecticse.com.au> writes:

> The publishing functionality now appears to be working as it
> should. 

Thanks for confirming!

-- 
 Bastien