dependency on ess

[dankessler]

poly-R will not load without ess: see these lines

However, ess is not declared as a dependency. Thus, it's possible to install poly-R without ess, in which case things won't work. For example, if I start a fresh emacs (with emacs -Q), configure melpa, install poly-R, and then (require 'poly-R), I get an error about being unable to load ess-mode.

This bug probably rarely comes up, since most people using poly-R have probably already installed ess, but it would be nice to make this explicit/automatic.

Fixing this is as simple as making the dependency explicit, but rather than submitting a PR, I wanted to check if there's a particular version of ess on which poly-R depends.

[mmaechler]

I tend to agree with @dankessler .. and propose to add such a dependency.
(It will have the advantage for users that they only need to install poly-R and that would ensure to get ess)

[rsparapa]

I think this means hacking line 7 of poly-R.el…

;; Package-Requires: ((emacs "25") (polymode "0.2.2") (poly-markdown "0.2.2") (poly-noweb "0.2.2"))

To make that…

;; Package-Requires: ((emacs "25") (ess "25") (polymode "0.2.2") (poly-markdown "0.2.2") (poly-noweb "0.2.2"))

Not sure if this will fix it. Since ESS v20250110.1437 would still satisfy (ess "25"), right?

I guess we won’t know until we actually try it. Just pushed it...