Put executable names into a central list of constants

[Profpatsch]

This way there is one place where the paths of required external tools can be changed at compile time (e.g. to patch in absolute paths for nix).

This is a rather large patch because pulp calls to external tools in a lot of places. Some interesting changes are in Test.purs and Version.purs.

This is part of an ongoing effort to package all Purescript tooling for nixpkgs in a nice way.

[hdgarrood]

I'm not hugely keen on this approach, because I worry I'm unlikely to remember to keep it set up this way in the future. Have you considered any other approaches? Would it work to have a wrapper script to set up the PATH prior to running pulp instead, for instance?

[Profpatsch]

Would it work to have a wrapper script to set up the PATH prior to running pulp instead, for instance?

Hm, we can create a wrapper script. It’s not as clean on downstream, though.