Flakify readme

Author: nmattia

flake.nix

@@ -10,6 +10,10 @@
     in rec {
       lib = forAllSystems (system: nixpkgs.legacyPackages."${system}".callPackage ./default.nix { });
 
+      packages = forAllSystems (system: {
+          readme = nixpkgs.legacyPackages."${system}".callPackage ./readme.nix { };
+      });
+
       # Useful when composing with other flakes:
       overlay = import ./overlay.nix;
 

readme.nix

@@ -1,12 +1,7 @@
 # This script is used to test & generate `README.md`.
+{ pkgs }:
 
 let
-  sources = import ./nix/sources.nix;
-
-  pkgs = import ./nix {
-    system = builtins.currentSystem;
-    nixpkgs = "nixpkgs";
-  };
 
   naersk = pkgs.callPackage ./default.nix {
     inherit (pkgs.rustPackages) cargo rustc;
@@ -26,17 +21,11 @@ let
   };
 
 in
-rec {
-  body = pkgs.runCommand "readme-body" {
-    buildInputs = [ docparse ];
-  } ''
-    cat ${./README.tpl.md} > $out
-    docparse ${./config.nix} >> gen
-    sed -e '/GEN_CONFIGURATION/{r gen' -e 'd}' -i $out
-  '';
-
-  test = pkgs.runCommand "readme-test" { } ''
-    diff ${./README.md} ${body}
-    touch $out
-  '';
-}
+pkgs.runCommand "readme"
+{
+  buildInputs = [ docparse ];
+} ''
+  cat ${./README.tpl.md} > $out
+  docparse ${./config.nix} >> gen
+  sed -e '/GEN_CONFIGURATION/{r gen' -e 'd}' -i $out
+''

script/gen

@@ -1,12 +1,9 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash
-#!nix-shell -I nixpkgs=./nix
-#!nix-shell -p nix
+#!/usr/bin/env bash
 
 set -euo pipefail
 
 echo "Updating README"
 
-cat $(nix-build ./readme.nix -A body) > README.md
+cat $(nix build .#readme --print-out-paths) > README.md
 
 echo done

test/fast/readme/default.nix

@@ -1,2 +1,8 @@
-{ ... }:
-(import ../../../readme.nix).test
+{ pkgs, ... }:
+let
+  readme = pkgs.callPackage ../../../readme.nix { };
+in
+pkgs.runCommand "readme-test" { } ''
+  diff ${../../../README.md} ${readme}
+  touch $out
+''