Define org mode macro with line breaks

Question

It is possible to define a macro in an org file as follow:

#+MACRO: macroname 

Is it possi

Answer 1

There is another solution which seems to work correctly. From org-macro.el source code:

;; VALUE starts with "(eval": it is a s-exp, `eval' it.
        (when (string-match "\\`(eval\\>" value)
          (setq value (eval (read value))))

Thus, you may define macro like this:

#+MACRO: newline (eval "\n")

Substitutions are also supported. The macro

#+MACRO: img (eval "#+CAPTION: $1\nfile:$2")

which is called as

{{{img(hello world!, ./img1.jpg)}}}

will be replaced with:

#+CAPTION: hello world!
file:./img1.jpg