Re: [patch] Add two new header args to LaTeX block

[Juan Manuel Macías]

Ihor Radchenko writes:

> Juan Manuel Macías <maciaschain@posteo.net> writes:
>
>> I am attaching a new patch with this idea incorporated. I have also
>> changed the name from full-to-pdf to standalone.
>>
>> +             (process (cdr (assq :process params)))
>> +         (org-preview-latex-default-process (if (and process
>> +                                                     (string-suffix-p 
>> ".png" out-file)
>> +                                                     (not imagemagick))
>
> Considering that 'imagemagick is one of the variants in
> `org-preview-latex-process-alist', it might be reasonable to allow
> :process imagemagick == :imagemagick yes

I wouldn't equate it. ':imagemagic yes' uses 'org-latex-convert-pdf'.
Instead, «:process 'imagemagick» depends on:

(imagemagick :programs
              ("latex" "convert")
              :description "pdf > png"
              :message "you need to install the programs: latex and 
imagemagick."
              :image-input-type "pdf"
              :image-output-type "png"
              :image-size-adjust (1.0 . 1.0)
              :latex-compiler ("pdflatex -interaction nonstopmode 
-output-directory %o %f")
              :image-converter ("convert -density %D -trim -antialias %f 
-quality 100 %O"))           

Also, one may want to put «:imagemagick yes» and compile the PDF
with another compiler or with a custom script:

:imagemagick yes :process '(...)

> Also, it feels incomplete to be able to define latex command for :file
> foo.pdf, but be limited to a pre-defined list of symbols for :file .png.

The ".png" method without ":imagemagick" does not depend on
'org-latex-pdf-process' but on 'org-create-formula-image', and this in turn
depends on the value of 'org-preview-latex-default-process':

...
((and (string-suffix-p ".png" out-file) (not imagemagick))
          (let ((org-format-latex-header
                 (concat org-format-latex-header "\n"
                         (mapconcat #'identity headers "\n"))))
            (org-create-formula-image
             body out-file org-format-latex-options in-buffer)))
...

If you put :file foo.png without :imagemagick, and want to control the
process or change the compiler, you can do it with:

:process '(foo :latex-compiler ("some LaTeX command")) 

since this syntax is what org-preview-latex-default-process expects.

In all other cases, including :imagemagick, the compilation process
depends on the value of org-latex-pdf-process.

Anyway, I don't understand why that feature option (convert to an image
without :imagemagick method) is limited to .png, when other graphic files are
possible. I can define something like this:

(setq org-preview-latex-default-process
      '(my-process
        :programs ("lualatex" "convert")
        :description "pdf > jpg"
        :image-input-type "pdf"
        :image-output-type "jpg"
        :latex-compiler ("lualatex -interaction nonstopmode -output-directory 
%o %f")
        :image-converter ("convert -density %D -trim -antialias %f -quality 100 
%O")))

But if I put :file foo.jpg nothing happens. Maybe that part should be
corrected... Something like (string-match-p "\\.png\\|\\.jpg\\|..." out-file)?

Best regards,

Juan Manuel 

-- 
Juan Manuel Macías -- Composición tipográfica, tratamiento de datos, diseño 
editorial y ortotipografía