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Re: Inserting tables programatically in elisp
From: |
Jean Louis |
Subject: |
Re: Inserting tables programatically in elisp |
Date: |
Sat, 5 Nov 2022 12:02:13 +0300 |
User-agent: |
Mutt/2.2.7+37 (a90f69b) (2022-09-02) |
* Heime <heimeborgia@protonmail.com> [2022-11-05 10:45]:
> Have been introspecting the possibility of conveniently inserting table
> programatically
> in elisp and encountered "table.el".
>
> Have constructed this function, but the difficulty centers around
> the challenge of inserting text in specific tests.
>
> (defun make-table ()
> (interactive)
> (table-insert 4 5)
> (table-forward-cell)
> (table-insert-sequence "icomplt-horz" 1 1 1 'center)
> (table-forward-cell 4)
> (table-insert-sequence "icomplt-vert" 1 1 1 'center)
> (table-release))
>
> It might be that "table.el" was designed under the assumption that the table
> would
> be edited interactively rather than from ELisp. The lack of info may just
> reflect
> that nobody has thought about it making tables programatically that also goes
> beyond
> its utilisation in "org-mode".
>
> I understand that "Org" cooperates with its author Takaaki Ota, perhaps
> things could
> be extended in a way that makes inserting tables programatically much easier
> to work
> with.
I would go programmatically not by hard coding the table walk, but by
using some structure, for example:
(setq my-table '(("ID" "Description" "Amount") ;; this must be header
(1 "Payment for domain" 10.50)
(2 "Transfer from Doe" 250)))
Then I would use some function, something like:
(my-org-table-generate my-table calculat-total 3rd-column)
Then the function would only interpolate the table with basic
small details, which allow later automatic table alignment:
(defun rcd-org-table-cell (object)
(cond ((numberp object) (format "| %.2f " object))
(t (format "| %s " object))))
(rcd-org-table-cell "Hello") ⇒ "| Hello "
(defun rcd-org-table-horizontal-line ()
"Return `|-' as horizontal-line."
"|--\n")
then for rows:
(defun rcd-org-table-row (list)
(with-temp-buffer
(while list
(insert (rcd-org-table-cell (pop list))))
(insert "\n")
(buffer-string)))
This means you can do something like:
(rcd-org-table-row '("ID" "Description" "Amount")) ⇒ "| ID | Description |
Amount "
then you make the main function:
(defun rcd-org-table (structure)
(let ((header (pop structure)))
(with-temp-buffer
(insert "\n")
(insert (rcd-org-table-row header))
(insert (rcd-org-table-horizontal-line))
(while structure
(insert (rcd-org-table-row (pop structure))))
(insert "\n")
(org-mode)
(goto-char 2)
(org-table-align)
(buffer-substring-no-properties (point-min) (point-max)))))
And now the final result:
(rcd-org-table my-table) ⇒ "
| ID | Description | Amount |
|------+--------------------+--------|
| 1.00 | Payment for domain | 10.50 |
| 2.00 | Transfer from Doe | 250.00 |
"
--
Jean
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