Hi Bastien, Here are some examples that I have in mind. One example would be to simplify my hacked solution to from https://lists.gnu.org/archive/html/emacs-orgmode/2020-09/msg00175.html. I could apply that to all the headings in a subtree by defining it once in the property drawer. Another example would be to only tangle a block when a certain value was true, it would require using an unofficial header convention to store the name of the file per block, or it could use the name of the block. I do something like that around line 1336 of https://raw.githubusercontent.com/SciCrunch/sparc-curation/9c08e82ab0b8c497e01d8542ecb1195d40111767/docs/setup.org. Another extremely common use case I have is detecting that I am running on a particular host which requires a slightly different value than some other host that I run regularly on, for example if I am going to be running a large number of blocks using :dir and on host a it needs to be /home/my-usual-user-name/working/ and on another it has to be /home/my-other-user-name/working/ because I wasn't the first user named tom to get an account on that system. Similar use case would be switching the database port based on which host I was on since I often forward a remote database port via ssh while also having a local database on that port as well. Another case would be to be able to blanked switch :tangle from yes to no based on whether a sentinel file was present or any other condition you could imagine (this is similar to the second example). Best! Tom
On Sat, Sep 5, 2020 at 10:00 PM Bastien <b...@gnu.org> wrote: > > Thanks for weighing in into this discussion. > > Tom Gillespie <tgb...@gmail.com> writes: > > > I have a number of use > > cases that I can imagine would benefit greatly from being able to > > define a :header-args: :header (lambda () "yay!") property as a > > closure > > Can you give some examples? I would love to get a better sense of > the usefulness of this feature. > > -- > Bastien