Re: How to tame compiler?

[Jean Louis <bugs@gnu.support>]

* Michael Heerdegen <michael_heerdegen@web.de> [2021-05-02 08:59]:
> Jean Louis <bugs@gnu.support> writes:
> 
> > How do I go to create dynamical bindings? Help me.
> 
> Newest Emacs versions have `dlet' to create dynamical bindings.  Here is
> the definition:
> 
> #+begin_src emacs-lisp
> (defmacro dlet (binders &rest body)
>   "Like `let*' but using dynamic scoping."
>   (declare (indent 1) (debug let))
>   `(let (_)
>      ,@(mapcar (lambda (binder)
>                  `(defvar ,(if (consp binder) (car binder) binder)))
>                binders)
>      (let* ,binders ,@body)))
> #+end_src
> 
> Use that macro to create dynamical bindings where you really need, and
> rely on lexical binding else.

That really helped me, or I would be lost today. 

As my `rcd-template-eval' function did work, but somehow, for unknown
reasons as indicated already by developers, it started misbehaving,
and variables sometimes interpolated, sometimes not, or maybe at
second invokation not.

And I had to enclose the variables in the function within `dlet' and
now it works well. But I have to tame compiler...

This function can now generate thousands of pages, pre-process it,
process with Markdown, Asciidoctor, txt2tags, Org mode, or however,
page is written (or not process...) and produce the output.

I guess it is very inefficient. Important is that it works.

(defun wrs-generate-page (page-id)
  (dlet ((page (rcd-db-table-id-hash "pages" page-id cf-db))
	 (area (rcd-db-table-id-hash "areas" (gethash "pages_area" page) cf-db))
	 (template (rcd-db-table-id-hash "templates" 
					 (or (gethash "pages_templates" page)
					     (gethash "areas_template" area))
					 cf-db))
	 (pages_title (gethash "pages_title" page))
	 (pages_keywords (gethash "pages_keywords" page))
	 (pages_description (gethash "pages_description" page))
	 (variables (make-hash-table :test 'equal))
	 (_ (hash-append variables (wrs-variables-hash nil nil nil 3)))
	 (_ (hash-append variables (wrs-variables-hash (gethash "pages_area" page))))
	 (_ (hash-append variables (wrs-variables-hash nil (gethash "templates_id" template))))
	 (language (rcd-db-get-entry "languages" "languages_extension" 
				     (or (gethash "pages_language" page)
					 (gethash "areas_defaultlanguage" area))
				     cf-db))
	 (_ (puthash "languages_extension" language variables))
	 (_ (when (gethash "areas_company" area)
	      (puthash "areas_company"
		       (rcd-db-get-entry "accounts" "accounts_name"
					 (gethash "areas_company" area)
					 cf-db)
		       variables)))
	 (_ (hash-append variables page area template))
	 (text (rcd-template-eval (gethash "pages_content" page "") '("⟦" "⟧") variables))
	 (processor (gethash "templates_processor" template))
	 (text (wrs-process-text processor text))
	 (_ (puthash "pages_content" text variables))
	 (template (gethash "templates_content" template))
	 (open-graph-type "Article")
	 (html (rcd-template-eval template '("⟦" "⟧") variables))
	 (local-file (wrs-page-url page-id t)))
    (string-to-file-force html local-file)))

-- 
Jean

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