[20.09] place-cursor-at: init at 1.0.1

[unclechu]

Motivation for this change

In current master it was just picked from haskellPackages in top-level packages (see #118598). But in release-20.09 this package wasn’t picked from Hackage yet (see failed attempt to backport #118626). So this MR just directly pins the version from the source repo.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[SuperSandro2000]

Please follow https://github.com/NixOS/nixpkgs/blob/master/.github/CONTRIBUTING.md#backporting-changes to backport a commit.

[unclechu]

@SuperSandro2000 Please read the description. It is impossible to simply backport it (see #118626).

[unclechu]

@sternenseemann Are there any more changes I’m supposed to make? What would be an acceptance criteria?

[sternenseemann]

can you wrap the mkDerivation with justStaticExecutables? Should save on runtime closure possibly.

[unclechu]

@sternenseemann for some reason it fails:

nix run -I nixpkgs=. nixpkgs.place-cursor-at -c place-cursor-at

error: anonymous function at .../nixpkgs/pkgs/development/haskell-modules/generic-builder.nix:13:1 called with unexpected argument 'mkDerivation', at .../nixpkgs/lib/customisation.nix:69:16

I just took the flags that justStaticExecutables sets and added them to the derivation. Would this be okay?

[sternenseemann]

Sure, doesn't really matter that much for this backport. Can you squash the commits?

[unclechu]

@sternenseemann Squashed.

[sternenseemann]

Can you also adjust the commit message according to this?

[unclechu]

@sternenseemann Done