* Elisp macro for working with org tables
@ 2022-08-03 8:33 Mark Clements
2022-08-03 10:13 ` Ihor Radchenko
0 siblings, 1 reply; 2+ messages in thread
From: Mark Clements @ 2022-08-03 8:33 UTC (permalink / raw)
To: emacs-orgmode@gnu.org
In response to a question on Stackoverflow (https://stackoverflow.com/questions/50921305/org-table-and-named-columns-for-babel-processing), I have written an elisp macro to work with org tables:
#+NAME: test-table
| a | b |
|---+---|
| 1 | 2 |
| 3 | 4 |
#+NAME: test-table-script
#+BEGIN_SRC emacs-lisp :var table=test-table :colnames no
(require 'cl)
(defmacro with-table (table expression)
"Given an org table with colnames, evaluate an expression using the colnames.
Note: use ':colnames no' in the header -- this imports the names but does not export them."
`(let* ((table-with-colnames (org-babel-get-colnames ,table))
(names (loop for name in (cdr table-with-colnames)
collect (if (stringp name) (intern name) name))))
(funcall
`(lambda (data)
(mapcar (lambda (row)
(cl-destructuring-bind ,names row ,',expression))
data))
(car table-with-colnames))))
;; example to add a third column
(cons '(a b c) (cons 'hline (with-table table (list a b (+ a b)))))
#+END_SRC
#+RESULTS: test-table-script
| a | b | c |
|---+---+---|
| 1 | 2 | 3 |
| 3 | 4 | 7 |
Comments are welcome -- and I hope that this is useful.
Sincerely, Mark.
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Elisp macro for working with org tables
2022-08-03 8:33 Elisp macro for working with org tables Mark Clements
@ 2022-08-03 10:13 ` Ihor Radchenko
0 siblings, 0 replies; 2+ messages in thread
From: Ihor Radchenko @ 2022-08-03 10:13 UTC (permalink / raw)
To: Mark Clements; +Cc: emacs-orgmode@gnu.org
Mark Clements <mark.clements@ki.se> writes:
> In response to a question on Stackoverflow (https://stackoverflow.com/questions/50921305/org-table-and-named-columns-for-babel-processing), I have written an elisp macro to work with org tables:
>
> #+NAME: test-table
> | a | b |
> |---+---|
> | 1 | 2 |
> | 3 | 4 |
> ....
> Comments are welcome -- and I hope that this is useful.
Usually, we use table formulas in such situations.
Table formulas support named columns, lines, cells and constants.
> #+NAME: test-table-script
> #+BEGIN_SRC emacs-lisp :var table=test-table :colnames no
> (require 'cl)
> (defmacro with-table (table expression)
> "Given an org table with colnames, evaluate an expression using the colnames.
> Note: use ':colnames no' in the header -- this imports the names but does not export them."
> `(let* ((table-with-colnames (org-babel-get-colnames ,table))
> (names (loop for name in (cdr table-with-colnames)
> collect (if (stringp name) (intern name) name))))
> (funcall
> `(lambda (data)
> (mapcar (lambda (row)
> (cl-destructuring-bind ,names row ,',expression))
> data))
Note that NAMES may contain forbidden chars for Elisp symbols.
Best,
Ihor
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