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#+PROPERTY: header-args:emacs-lisp :lexical t
Setting the property for the whole buffer to have lexical binding in emacs-lisp
source blocks. Lexical binding will hold when evaluating any source block where
no other ~:lexical~ header arg is present.
* Moo
:PROPERTIES:
:header-args:emacs-lisp+: :noweb-ref moo
:END:
noweb-ref will make all blocks under this heading expand with =<<moo>>=
#+begin_src emacs-lisp
(+ x 3)
#+end_src
* Goo
:PROPERTIES:
:header-args:emacs-lisp+: :noweb yes
:header-args:emacs-lisp+: :var foo="bar"
:END:
turn noweb on so we interpret the =<<moo>>= syntax as code to expand
setting a var ~foo~ to the string "bar" to be used later.
** Poop
properties go down into the subtrees
#+begin_src emacs-lisp
(let ((x 1))
<<moo>>)
#+end_src
#+RESULTS:
: 4
*** Floppy
:PROPERTIES:
:header-args:emacs-lisp+: :noweb no
:END:
apparently continuing with the "+" pattern takes the no over the yes above
this will fail to expand moo.
#+begin_src emacs-lisp
(let ((x 1))
<<moo>>)
#+end_src
#+RESULTS:
: let: Symbol’s value as variable is void: <<moo>>
** Gah
Define a function with a free variable x.
#+begin_src emacs-lisp :results none
(defun getx ()
x)
#+end_src
Because ~x~ is lexically bound in this block, ~getx~ will error
since ~x~ is not a dynamic variable and isn't bound with indefinite scope.
#+begin_src emacs-lisp
(let ((x 1)) ; ‘x’ is lexically bound.
(getx))
#+end_src
#+RESULTS:
: Symbol’s value as variable is void: x
we can flip lexical binding off for the evaluation of this block and
the free variable ~x~ is bound when ~getx~ is evaluated.
#+begin_src emacs-lisp :lexical no
(let ((x 2)) ; ‘x’ is dynamically bound
(getx))
#+end_src
#+RESULTS:
: 2
** Bah
:PROPERTIES:
:header-args:emacs-lisp+: :var foo="baz"
:END:
overriding the variable in this subtree
#+begin_src emacs-lisp
foo
#+end_src
#+RESULTS:
: baz
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