big changes

2 files changed, 128 insertions, 0 deletions

diff --git a/lib/nix-furnace/README.md b/lib/nix-furnace/README.md
new file mode 100644
index 0000000..cff5c2d
--- /dev/null
+++ b/lib/nix-furnace/README.md
@@ -0,0 +1,7 @@
+# `nix-furnace`
+my homebrewed library for defining nix machines
+
+Features:
+- Homogenous modules: each module contains a home part, a system part, and a shared `options.nix`
+- Path-based: All modules in `modules/` are imported automatically
+- Exclusive: Only supports single-user nixos machines running home-manager
diff --git a/lib/nix-furnace/default.nix b/lib/nix-furnace/default.nix
new file mode 100644
index 0000000..7c18ae9
--- /dev/null
+++ b/lib/nix-furnace/default.nix
@@ -0,0 +1,121 @@
+let
+  lazyImport = path:
+    if (builtins.pathExists path)
+    then import path
+    else {};
+
+  mkIfNull = cond: onTrue:
+    if cond
+    then onTrue
+    else null;
+
+  getSubdirs = dir:
+    builtins.filter (x: x != null)
+    (builtins.attrValues
+      (builtins.mapAttrs
+        (name: value: mkIfNull (value == "directory") name)
+        (builtins.readDir dir)));
+
+  getSubfiles = dir:
+    builtins.filter (x: x != null)
+    (builtins.attrValues
+      (builtins.mapAttrs
+        (name: value: mkIfNull (value == "file") name)
+        (builtins.readDir dir)));
+
+  mkHomeImports = modName: [
+    (lazyImport ../../modules/${modName}/options.nix)
+    (lazyImport ../../modules/${modName}/home/default.nix)
+  ];
+  mkSystemImports = modName: [
+    (lazyImport ../../modules/${modName}/options.nix)
+    (lazyImport ../../modules/${modName}/system/default.nix)
+  ];
+
+  mkModules = mapFn: {
+    imports =
+      [../../modules/options.nix]
+      ++ (builtins.foldl' (a: b: a ++ b) [] (builtins.map mapFn (getSubdirs ../../modules)));
+  };
+
+  mkHomeModules = mkModules mkHomeImports;
+  mkSystemModules = mkModules mkSystemImports;
+
+  mkHost = {
+    hostname,
+    namespace,
+    inputs,
+    ...
+  }: let
+    preloadedConfig = import ../../hosts/${hostname}/config.nix {inherit inputs;};
+    username = preloadedConfig."${namespace}".user.name;
+
+    furnaceOptions = {lib, ...}: let
+      inherit (lib) mkOption types;
+    in {
+      options.nix-furnace = {
+        extraHomeModules = mkOption {
+          type = with types; listOf path;
+          default = [];
+        };
+
+        extraSystemModules = mkOption {
+          type = with types; listOf path;
+          default = [];
+        };
+      };
+    };
+  in
+    inputs.nixpkgs.lib.nixosSystem {
+      specialArgs = {inherit inputs;};
+      modules =
+        [
+          {networking.hostName = hostname;}
+
+          ../../hosts/${hostname}/config.nix
+
+          mkSystemModules
+
+          furnaceOptions
+
+          # Home-manager
+          inputs.home-manager.nixosModules.home-manager
+          {
+            home-manager = {
+              backupFileExtension = "bak";
+              useGlobalPkgs = true;
+              useUserPackages = true;
+              extraSpecialArgs = {inherit inputs;};
+              users."${username}" = {
+                imports =
+                  [
+                    mkHomeModules
+
+                    furnaceOptions
+
+                    ../../hosts/${hostname}/config.nix
+                  ]
+                  ++ preloadedConfig.nix-furnace.extraHomeModules;
+              };
+            };
+          }
+        ]
+        ++ preloadedConfig.nix-furnace.extraSystemModules;
+    };
+
+  mkFlake = {
+    namespace,
+    inputs,
+    ...
+  }: {
+    nixosConfigurations =
+      builtins.listToAttrs
+      (builtins.map (hostname: {
+          name = hostname;
+          value = mkHost {inherit inputs hostname namespace;};
+        })
+        (getSubdirs ../../hosts));
+  };
+in {
+  inherit mkFlake;
+}