Rework the whole NixOS and packages

This uses now primarilly overlays and also variable NIX_PROFILES to
chain-load shellrc from bashrc.d and zshrc.d.

1 files changed, 54 insertions, 0 deletions

diff --git a/nixos.nix b/nixos.nix
new file mode 100644
index 0000000..77b272c
--- /dev/null
+++ b/nixos.nix
@@ -0,0 +1,54 @@
+overlays: {
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cnf = config.programs.shellrc;
+  zshEnable = config.programs.zsh.enable;
+
+  # Source all files in an appropriate shell directory in every profile
+  shellInit = dir: ''
+    for p in $NIX_PROFILES; do
+      for file in $p/etc/${dir}/*; do
+        [ -f "$file" ] || continue
+        . "$file"
+      done
+    done
+  '';
+in {
+  options = {
+    programs.shellrc = {
+      enable = mkOption {
+        type = types.bool;
+        default = true;
+        description = "If shellrc should be enabled.";
+      };
+      desktop = mkOption {
+        type = types.bool;
+        default = false;
+        description = "If shellrc's desktop specific files should be used.";
+      };
+    };
+  };
+
+  config = mkMerge [
+    {
+      nixpkgs.overlays = overlays;
+
+      programs.bash.interactiveShellInit = shellInit "bashrc.d";
+      programs.zsh.interactiveShellInit = mkIf zshEnable (shellInit "zshrc.d");
+    }
+    (mkIf cnf.enable {
+      environment.systemPackages =
+        [pkgs.shellrc-bash]
+        ++ optional cnf.desktop pkgs.shellrc-desktop
+        ++ optional zshEnable pkgs.shellrc-zsh;
+
+      # Disable default prompt as we have our own
+      programs.bash.promptInit = "";
+      programs.zsh.promptInit = ""; # Disable default prompt as we have our own
+    })
+  ];
+}