org-mode/testing/examples/babel.org

#+Title: a collection of examples for Babel tests

* =:noweb= header argument expansion
  :PROPERTIES:
  :ID:       eb1f6498-5bd9-45e0-9c56-50717053e7b7
  :END:

#+source: noweb-example
#+begin_src emacs-lisp
  (message "expanded")
#+end_src

#+begin_src emacs-lisp :noweb yes
  ;; noweb-yes-start
  <<noweb-example>>
  ;; noweb-yes-end
#+end_src

#+begin_src emacs-lisp :noweb no
  ;; noweb-no-start
  <<noweb-example>>
  ;; noweb-no-end
#+end_src

#+begin_src emacs-lisp :noweb tangle
  ;; noweb-tangle-start
  <<noweb-example>>
  ;; noweb-tangle-end
#+end_src

* elisp forms in header arguments
  :PROPERTIES:
  :ID:       22d67284-bf14-4cdc-8319-f4bd876829d7
  :var:      prop=(+ 2 2)
  :END:

#+begin_src emacs-lisp
  prop
#+end_src

#+results:
: 4

* excessive id links on tangling
  :PROPERTIES:
  :ID:       ef06fd7f-012b-4fde-87a2-2ae91504ea7e
  :END:

** no, don't give me an ID
#+begin_src emacs-lisp :tangle no
  (message "not to be tangled")
#+end_src

** yes, I'd love an ID
   :PROPERTIES:
   :ID:       ae7b55ca-9ef2-4d30-bd48-da30e35fd0f3
   :END:
#+begin_src emacs-lisp :tangle no
  (message "for tangling")
#+end_src
* simple variable resolution
  :PROPERTIES:
  :ID:       f68821bc-7f49-4389-85b5-914791ee3718
  :END:

#+source: four
#+begin_src emacs-lisp
  (list 1 2 3 4)
#+end_src

#+begin_src emacs-lisp :var four=four
  (length four)
#+end_src

#+results:
: 4

* multi-line header arguments
  :PROPERTIES:
  :ID:       b77c8857-6c76-4ea9-8a61-ddc2648d96c4
  :END:

#+headers: :var letters='(a b c d e f g)
#+begin_src emacs-lisp :var numbers='(1 2 3 4 5 6 7)
  (map 'list #'list numbers letters)
#+end_src

#+results:
| 1 | a |
| 2 | b |
| 3 | c |
| 4 | d |
| 5 | e |
| 6 | f |
| 7 | g |

* simple named code block
  :PROPERTIES:
  :ID:       0d82b52d-1bb9-4916-816b-2c67c8108dbb
  :END:

#+source: i-have-a-name
#+begin_src emacs-lisp
  42
#+end_src

#+results: 
: 42

#+results: i-have-a-name
: 42

* Pascal's Triangle -- export test
  :PROPERTIES:
  :ID:       92518f2a-a46a-4205-a3ab-bcce1008a4bb
  :END:

#+source: pascals-triangle
#+begin_src emacs-lisp :var n=5 :exports both
  (defun pascals-triangle (n)
    (if (= n 0)
        (list (list 1))
      (let* ((prev-triangle (pascals-triangle (- n 1)))
             (prev-row (car (reverse prev-triangle))))
        (append prev-triangle
                (list (map 'list #'+
                           (append prev-row '(0))
                           (append '(0) prev-row)))))))

  (pascals-triangle n)
#+end_src

* calling code blocks from inside table
  :PROPERTIES:
  :ID:       6d2ff4ce-4489-4e2a-9c65-e3f71f77d975
  :END:

#+source: take-sqrt
#+begin_src emacs-lisp :var n=9
  (sqrt n)
#+end_src

* executing an lob call line
  :PROPERTIES:
  :results:  silent
  :END:

69fbe856-ca9c-4f20-9146-826d2f488c1d
#+call: echo(input="testing")
#+call: echo(input="testing") :results vector
#+call: echo[:var input="testing"]()
#+call: echo[:var input="testing"]() :results vector