Re: Specifying the tangle filename based on the source filename?

[Jack Henahan <jhenahan@me.com>]

I do something similar, and I use a snippet like this

#+begin_src emacs-lisp
  (defun the-in-the-org-lib-p ()
    (and (f-this-file)
         (f-child-of? (f-this-file) the-org-lib-directory)))

  (defun the-org-lib-hook ()
    (if (the-in-the-org-lib-p)
        (progn
          (setq-local org-babel-default-header-args:emacs-lisp
                      `((:tangle . ,(f-expand (f-swap-ext (f-filename (f-this-file)) "el") the-lib-directory))
                        (:noweb . "yes"))))))

    (add-hook 'org-mode-hook 'the-org-lib-hook)
#+end_src

`the-org-lib-directory' points to where all my Org config sources are,
while `the-lib-directory' points to where the tangled files go. My Org
files then have a structure like

org/whatever.org

* Configuring Whatever Features
** Requirements :noexport:
#+begin_src emacs-lisp
  ;; -*- lexical-binding: t; -*-
  ;;; whatever.el --- Whatever functionality
     
  (require 'whatever)
#+end_src
** Some Subfeature
Explain how we use the feature
#+begin_src emacs-lisp
  (my-configuration 'stuff)
#+end_src

** Provides :noexport:
#+begin_src emacs-lisp
  (provide 'whatever)

  ;;; whatever.el ends here
#+end_src

I have some additional configuration to tangle my lib files on save, and
to regenerate the top-level documentation so that (in theory) the README
is always up to date with the configuration. The :noexport: tags remove
the noise of require and provides when I export.

Diego Zamboni <diego@zzamboni.org> writes:

> Hi,
>
> I’ve been converting many of my configuration files to org-mode to better document them (examples:
> https://github.com/zzamboni/dot_emacs/blob/master/init.org, https://github.com/zzamboni/dot_elvish/blob/master/rc.org). Usually I
> have a line like the following at the top of each org file:
>
> #+PROPERTY: header-args:emacs-lisp :tangle init.el
>
> So that all the code blocks in the file are, by default, tangled to the corresponding config file. I was wondering if it might be
> possible to avoid hardcoding the output file (“init.el” in this example) and instead derive it from the source filename (“init.org” in
> this case). I’ve looked a bit through the manual and although I found the {{{input-file}}} macro, I couldn’t get it to work.
>
> Thanks for any help,
> —Diego