Chris Maier <christopher.ma...@gmail.com> writes: > On Wed, Jan 19, 2011 at 5:05 AM, Rainer M Krug <r.m.k...@gmail.com> wrote: >> On 01/19/2011 08:22 AM, Eric Schulte wrote: >>> >>> In addition to the solution Charles posted, it is possible to put >>> arbitrary elisp forms into header arguments, so the following >>> alternative to your block above will create the directory (if it doesn't >>> already exist) whenever the block is tangled or evaluated. >>> >>> #+begin_src clojure :tangle (prog1 "src/foo.clj" (make-directory "src" ".")) >>> (ns foo) >>> >>> (defn my-inc [x] >>> (+ x 1)) >>> #+end_src > > This will do what I'm looking for, thanks! > > Is there a place where this and the eval-on-startup trick Charles > posted are documented? If so, I missed it, and these are both really > useful to know. >
We don't currently have a good place in which to collect such tricks, probably the closest is a file called scraps.org which I use for stubbing out examples when responding to mailing list questions or doing development. Each subheading is a short self-contained example. I do plan on transforming this at some point into either a page on Worg "Babel Tricks" or into a "Babel a Day" series or some such. The page is available at the following (notice this dir. trick is at the top) https://github.com/eschulte/babel-dev/raw/master/scraps.org If anyone would like to take on the task of transferring this information into a page on Worg that would be much appreciated! Maybe a programmatic solution would be best, since I imagine this file will continue to grow, or maybe I should just move this file to Worg directly, if the Worg maintainers don't mind a steady trickle of small commits... > >> Would it be possible, to include this into tangling, i.e. if the folder >> in which the source file should be created does not exist, create it? >> >> I remember vaguely a discussion along these lines some time ago, but I >> don't remember the outcome? > > This would be a great feature to have. Eric's embedded Lisp code > trick will do the job, but I can imagine that it would get cumbersome > for more complex projects. > This issue has come up recently -- also raised (I believe) by a Clojurian most likely wanted to create a lein directory layout. The reason that I push back against this, is that I often times accidentally use a tangle path in which the directory does not exist and the error notification serves as a useful warning that I either mis-typed the directory or need to create it. I would suggest either using the pre-tangle hook, or using my trick above, which could be made more graceful with the following function defined... #+begin_src emacs-lisp (defun mkdir-p (file &optional dir) "Create any parent directories of FILE if missing and return FILE." (make-directory (file-name-directory file) (or dir ".")) file) #+end_src However given that there seems to be some wide support for this maybe a customization variable should be introduce, e.g. org-babel-tangle-mkdirs-p or somesuch... Cheers -- Eric > > Thanks for all the help, everyone! > > Chris _______________________________________________ Emacs-orgmode mailing list Please use `Reply All' to send replies to the list. Emacs-orgmode@gnu.org http://lists.gnu.org/mailman/listinfo/emacs-orgmode
