From 0103a1961804640c570f951f97420201cd219071 Mon Sep 17 00:00:00 2001
From: Minijackson <minijackson@riseup.net>
Date: Tue, 9 Nov 2021 13:50:42 +0100
Subject: flake: add overlay and checks

---
 flake.lock | 19 ++++++++++++++++++-
 flake.nix  | 63 ++++++++++++++++++++++++++++++++++++++++++++------------------
 2 files changed, 63 insertions(+), 19 deletions(-)

diff --git a/flake.lock b/flake.lock
index e03bfad..d820156 100644
--- a/flake.lock
+++ b/flake.lock
@@ -15,9 +15,26 @@
         "type": "github"
       }
     },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1636333654,
+        "narHash": "sha256-3wh9PtCzcaJQuZrgZ+ygKfhltkDNNqT6zOzGsRbjZEo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e74894146a42ba552ebafa19ab2d1df7ccbc1738",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
-        "flake-utils": "flake-utils"
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index ad3d540..4dce373 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,26 +2,53 @@
   description = "A simple bash library for your scripting needs";
 
   inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05";
 
-  outputs = { self, flake-utils }:
+  outputs = { self, flake-utils, nixpkgs, }:
     with flake-utils.lib;
-    eachSystem allSystems (system: {
-
-      # Convert a path to a derivation
-      # This is done so we don't depend on nixpkgs
-      packages.bash-lib = with builtins; derivation {
-        name = "bash-lib.sh";
-        src = readFile ./bash-lib.sh;
-        inherit system;
-
-        builder = "/bin/sh";
-        args = [
-          (toFile "builder.sh" ''
-            echo "$src" > $out
-          '')
-        ];
+    (eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ self.overlay ];
+        };
+      in
+      {
+
+        packages.bash-lib = pkgs.bash-lib;
+
+        defaultPackage = self.packages.${system}.bash-lib;
+
+      })) // {
+      checks.x86_64-linux = {
+        runAndCheckDemo =
+          let
+            pkgs = import nixpkgs {
+              system = "x86_64-linux";
+              overlays = [ self.overlay ];
+            };
+          in
+          pkgs.runCommand "runAndCheckDemo" { src = ./.; nativeBuildInputs = [ pkgs.shellcheck ]; } ''
+            unpackFile "$src"
+            cd */
+            shellcheck ./bash-lib.sh
+            shellcheck -x ./demo.sh
+
+            chmod +w . demo.sh
+            sed '/^fatal/d' -i demo.sh
+
+            patchShebangs ./demo.sh
+            ./demo.sh
+
+            touch $out
+          '';
       };
 
-      defaultPackage = self.packages.${system}.bash-lib;
-    });
+      overlay = final: prev: {
+        bash-lib = final.writeTextFile {
+          name = "bash-lib.sh";
+          text = builtins.readFile ./bash-lib.sh;
+        };
+      };
+    };
 }
-- 
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