Merge all dev modules together

Unlike applications which are usually independent of each other,
development tools are often used as needed.

dev/default.nix

@@ -1,12 +1,41 @@
 { pkgs, ... }:
 
 {
-  imports = [
-    ./editorconfig
-    ./nix
-    ./npm
-    ./rust
-  ];
+  programs.npm.enable = true;
+
+  home-manager.sharedModules = [{
+    editorconfig = {
+      enable = true;
+
+      settings = {
+        "*" = {
+          charset = "utf-8";
+          end_of_line = "lf";
+          insert_final_newline = true;
+          indent_size = 2;
+          indent_style = "space";
+          trim_trailing_whitespace = true;
+        };
+
+        "*.md".indent_style = "tab";
+
+        "Makefile" = {
+          indent_style = "tab";
+          indent_size = 4;
+        };
+
+        "*.html" = {
+          indent_style = "tab";
+          indent_size = 4;
+        };
+
+        "*.go" = {
+          indent_style = "tab";
+          indent_size = 4;
+        };
+      };
+    };
+  }];
 
   environment.systemPackages = with pkgs; [
     marksman
@@ -14,5 +43,23 @@
     lua-language-server
     clang-tools
     texlab
+
+    # nix
+    nil
+    nixfmt
+    nixos-generators
+
+    # node/yarn/deno
+    nodejs
+    yarn
+    deno
+
+    # rust
+    gcc
+    rustc
+    rustfmt
+    cargo
+    rust-analyzer
+    bacon
   ];
 }

dev/editorconfig/default.nix

@@ -1,30 +0,0 @@
-{
-  home-manager.sharedModules = [{
-    editorconfig = {
-      enable = true;
-      settings = {
-        "*" = {
-          charset = "utf-8";
-          end_of_line = "lf";
-          insert_final_newline = true;
-          indent_size = 2;
-          indent_style = "space";
-          trim_trailing_whitespace = true;
-        };
-        "*.md" = { indent_style = "tab"; };
-        "Makefile" = {
-          indent_style = "tab";
-          indent_size = 4;
-        };
-        "*.html" = {
-          indent_style = "tab";
-          indent_size = 4;
-        };
-        "*.go" = {
-          indent_style = "tab";
-          indent_size = 4;
-        };
-      };
-    };
-  }];
-}

dev/nix/default.nix

@@ -1,9 +0,0 @@
-{ pkgs, ... }:
-
-{
-  environment.systemPackages = with pkgs; [
-    nil
-    nixfmt
-    nixos-generators
-  ];
-}

dev/npm/default.nix

@@ -1,11 +0,0 @@
-{ pkgs, ... }:
-
-{
-  programs.npm.enable = true;
-
-  environment.systemPackages = with pkgs; [
-    nodejs
-    yarn
-    deno
-  ];
-}

dev/rust/default.nix

@@ -1,12 +0,0 @@
-{ pkgs, ... }:
-
-{
-  environment.systemPackages = with pkgs; [
-    gcc
-    rustc
-    rustfmt
-    cargo
-    rust-analyzer
-    bacon
-  ];
-}