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Re: [O] [patch, ox] #+INCLUDE resolves links

From: Nicolas Goaziou
Subject: Re: [O] [patch, ox] #+INCLUDE resolves links
Date: Sun, 21 Sep 2014 15:53:18 +0200


Rasmus <address@hidden> writes:

> Rasmus <address@hidden> writes:
>> This patch allows INCLUDE to have intuitive links as resolved by
>> `org-link'-search'.  A couple of examples:

Thanks for the patch. Some comments follow.

>> #+INCLUDE: file.org::#custom_id :noheadline :lines "3-"

Is it `:only-contents' or `:no-headline'? Also ":kwd1 :kbd2 value" is
usually a shortcut for ":kwd1 nil :kbd2 value" (at least in export
attributes). Your example is thus confusing, you should include the
expected value.

  #+INCLUDE: "file.org::#custom_id" :only-contents t :lines "3-"

> +elements.}.  If the keyword @code{:only-contents} is used, only the contents
> +of the element in included.  For headlines, drawers and properties

> +assumed to be in Org mode format and will be processed normally.  File-links
> +will be interpret as well:

>  ;;; ox.el --- Generic Export Engine for Org Mode
> -
>  ;; Copyright (C) 2012-2014 Free Software Foundation, Inc.

You can remove this chunk.

> +              (only-contents
> +               (and (string-match
> +                     
> ":\\(only-?contents?[[:space:]]*\\(?:'t\\|true\\|yes\\)?\\)" value)

This should be ":only-contents t" or ":only-contents nil".
":only-contents" alone can be tolerated as a shortcut for
":only-contents nil", but that's all.

> +                    (prog1 t
> +                      (setq value (replace-match "" nil nil value)))))

Since `replace-match' cannot return nil here, you can remove

  (prog1 t ...) 

wrapper. If you insist on ONLY-CONTENTS being t, then

  (progn (setq ...) t)

is better.

> +                      (org-export--prepare-file-contents file location 
> only-contents lines))))

Couldn't location, only-contents and lines be merged into a single
argument? At the moment, you are either short-circuiting or breaking
guard against circular inclusions (which relies on a combination of
file-name and lines).

IOW, each include keyword could be defined as a triplet of file name,
beginning and ending global positions. You could implement a helper
function to translate FILE LOCATION and ONLY-CONTENTS into this triplet,
which would then be passed to `org-export--prepare-file-contents'.

> -(defun org-export--prepare-file-contents (file &optional lines ind minlevel 
> id)
> +(defun org-export--prepare-file-contents (file &optional location 
> only-contents lines ind minlevel id)
>    "Prepare the contents of FILE for inclusion and return them as a string.
> +When optional argument LOCATION is a string the matching element
> +identified using `org-link-search' is returned.  Note that
> +`org-link-search-must-match-exact-headline' is locally set to
> +non-nil.  When ONLY-CONTENTS is non-nil only the contents of the
> +matched element in included.  If LOCATION is a headline and
> +ONLY-CONTENTS is non-nil, drawers and property-drawers
> +immediately following the first headline are also removed.
> +
>  When optional argument LINES is a string specifying a range of
>  lines, include only those lines.
> @@ -3420,6 +3437,26 @@ This is useful to avoid conflicts when more than one 
> Org file
>  with footnotes is included in a document."
>    (with-temp-buffer
>      (insert-file-contents file)
> +    (org-mode)

You cannot enforce `org-mode' as the current major mode since you can
include other file types.

> +    (when location
> +      (condition-case err
> +       ;; enforce consistency in search.
> +       (let ((org-link-search-must-match-exact-headline t))
> +         (org-link-search location))
> +     ;; helpful error messages
> +     (error (error (format "%s for %s::%s"
> +                           (error-message-string err) file location))))
> +      (narrow-to-region
> +       (org-element-property
> +     (if only-contents :contents-begin :begin) (org-element-at-point))
> +       (org-element-property (if only-contents :contents-end :end) 
> (org-element-at-point)))
> +      ;; get rid of drawers and properties
> +      (when only-contents
> +     (let ((element (org-element-at-point)))
> +       (while (member (org-element-type element) '(drawer property-drawer))
> +         (delete-region (org-element-property :begin element)
> +                        (org-element-property :end   element))
> +         (setq element (org-element-at-point))))))

This could be handled when building the triplet. However, please do not
skip drawers (property drawers are fine), as you cannot tell what the
contents are.

>      (when lines
>        (let* ((lines (split-string lines "-"))
>            (lbeg (string-to-number (car lines)))
> @@ -3495,7 +3532,7 @@ with footnotes is included in a document."
>      (org-element-normalize-string (buffer-string))))
>  (defun org-export-execute-babel-code ()
> -  "Execute every Babel code in the visible part of current buffer."
> +  "ExecUte every Babel code in the visible part of current buffer."

You can remove this chunk too.


Nicolas Goaziou

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