A very inmature exploration of divnix#38

flake.nix

@@ -6,9 +6,17 @@
       master.url = "nixpkgs/master";
       nixos.url = "nixpkgs/release-20.09";
       home.url = "github:nix-community/home-manager/release-20.09";
+
+      # DevShells
+      # Use the nixpkgs master for access to latest tooling.
+      devshell.url = "github:numtide/devshell/master";
+      devshell.inputs.nixpkgs.follows = "master"; # TODO: How does this compare with pkgImport below?
+      naersk.url = "github:nmattia/naersk";
+      naersk.inputs.nixpkgs.follows = "master";
+      mozilla-overlay = { url = "github:mozilla/mozilla-nixpkgs"; flake = false; }; # TODO: How does this compare with ./overlay?
     };
 
-  outputs = inputs@{ self, home, nixos, master }:
+  outputs = inputs@{ self, home, nixos, master, devshell, naersk, mozilla-overlay }:
     let
       inherit (builtins) attrNames attrValues readDir;
       inherit (nixos) lib;
@@ -52,7 +60,11 @@
           fullPath = name: overlayDir + "/${name}";
           overlayPaths = map fullPath (attrNames (readDir overlayDir));
         in
-        pathsToImportedAttrs overlayPaths;
+        pathsToImportedAttrs overlayPaths ++ [
+          (import mozilla-overlay)
+          devshell.overlay
+          naersk.overlay
+        ];
 
       packages."${system}" =
         let
@@ -79,10 +91,17 @@
           profilesList = import ./profiles/list.nix;
           profilesAttrs = { profiles = pathsToImportedAttrs profilesList; };
 
+          # shells
+          shellsList = import ./shells/list.nix;
+          shellsAttrs = { shells = pathsToImportedAttrs shellsList; };
+
         in
         recursiveUpdate
-          (recursiveUpdate cachixAttrs modulesAttrs)
-          profilesAttrs;
+          recursiveUpdate (
+            (recursiveUpdate cachixAttrs modulesAttrs)
+            profilesAttrs
+          )
+          shellsAttrs;
 
       templates.flk.path = ./.;
       templates.flk.description = "flk template";

shells/list.nix

@@ -0,0 +1,3 @@
+[
+  ./rust
+]

shells/rust/default.nix

@@ -0,0 +1,27 @@
+with pkgs;
+
+mkDevShell {
+  name = "Personal Rust DevShell";
+
+  packages = [
+    latest.rustChannels.stable.rust
+    wasm-bindgen-cli
+    binaryen
+
+    ncurses
+    pkgconfig
+    openssl
+    openssl.dev
+  ];
+
+  env.RUST_BACKTRACE = "1";
+
+  commands = [
+    {
+      name = "hello";
+      help = "say hello";
+      category = "fun";
+      command = "echo '''hello''' ";
+    }
+  ];
+}