comma/default.nix
Farid Zakaria 60a4cf8ec5 Prefer local nix-index if present
The nix-index database offered in the derivation
may be more out of date than what is present on the
system.

In fact, prefer any local nix-index database to the prebuilt
database included with comma
2020-08-13 12:57:22 -07:00

59 lines
1.6 KiB
Nix

{ pkgs ? import <nixpkgs> { }
, stdenv ? pkgs.stdenv
, lib ? pkgs.lib
, fetchurl ? pkgs.fetchurl
, nix-index ? pkgs.nix-index
, nix ? pkgs.nix
, fzy ? pkgs.fzy
, makeWrapper ? pkgs.makeWrapper
, runCommand ? pkgs.runCommand
, linkFarm ? pkgs.linkFarm
# We use this to add matchers for stuff that's not in upstream nixpkgs, but is
# in our own overlay. No fuzzy matching from multiple options here, it's just:
# Was the command `, mything`? Run `nixpkgs.mything`.
, overlayPackages ? []
}:
let
# nix-index takes a little while to run and the contents don't change
# meaningfully very often. This is generated by running `nix-index` and
# uploading `~/.cache/nix-index/files` to, well, anywhere.
indexCache = fetchurl {
url = "https://s3.amazonaws.com/burkelibbey/nix-index-files";
sha256 = "06p58f82wipd0a8wbc7j3l0p8iaxvdibgshmc9dbxkjf0hmln3kx";
};
# nix-locate needs the --db argument to be a directory containing a file
# named "files".
nixIndexDB = linkFarm "nix-index-cache" [
{ name = "files"; path = indexCache; }
];
in
stdenv.mkDerivation rec {
name = "comma";
src = ./.;
buildInputs = [ nix-index nix fzy ];
nativeBuildInputs = [ makeWrapper ];
installPhase = let
caseCondition = lib.concatStringsSep "|" (overlayPackages ++ [ "--placeholder--" ]);
in ''
mkdir -p $out/bin
sed -e 's/@OVERLAY_PACKAGES@/${caseCondition}/' < , > $out/bin/,
chmod +x $out/bin/,
wrapProgram $out/bin/, \
--set PREBUILT_NIX_INDEX_DB ${nixIndexDB} \
--prefix PATH : ${nix-index}/bin \
--prefix PATH : ${nix}/bin \
--prefix PATH : ${fzy}/bin
ln -s $out/bin/, $out/bin/comma
'';
}