add devenv for quick development on nixos

.envrc

@@ -0,0 +1,3 @@
+source_url "https://raw.githubusercontent.com/cachix/devenv/95f329d49a8a5289d31e0982652f7058a189bfca/direnvrc" "sha256-d+8cBpDfDBj41inrADaJt+bDWhOktwslgoP5YiGJ1v0="
+
+use devenv

.gitignore

@@ -9,4 +9,7 @@ checkrr
 badfiles.csv
 checkrr.log
 webserver/build
-webserver/node_modules
+webserver/node_modules
+.devenv/
+.direnv/
+.devenv.flake.nix

devenv.lock

@@ -0,0 +1,116 @@
+{
+  "nodes": {
+    "devenv": {
+      "locked": {
+        "dir": "src/modules",
+        "lastModified": 1727457166,
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "6090da46bfb53e358b818cee491df1a25daa85e0",
+        "type": "github"
+      },
+      "original": {
+        "dir": "src/modules",
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1716977621,
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "4267e705586473d3e5c8d50299e71503f16a6fb6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1727540905,
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "fbca5e745367ae7632731639de5c21f29c8744ed",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1727514110,
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "85f7a7177c678de68224af3402ab8ee1bcee25c8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

devenv.nix

@@ -0,0 +1,43 @@
+{ pkgs, lib, config, inputs, ... }:
+
+{
+  # https://devenv.sh/basics/
+  env.GREET = "devenv";
+
+  # https://devenv.sh/packages/
+  packages = [ 
+    pkgs.git
+    pkgs.go
+    pkgs.nodejs
+    pkgs.yarn
+  ];
+
+  languages = {
+    go.enable = true;
+    javascript = {
+      enable = true;
+      npm = { 
+        enable = true;
+        install.enable = true;
+      };
+      yarn = {
+        enable = true;
+        install.enable = true;
+      };
+    };
+  };
+
+  enterShell = ''
+    go version
+    node --version
+    yarn --version
+  '';
+
+  # https://devenv.sh/services/
+  # services.postgres.enable = true;
+
+  # https://devenv.sh/pre-commit-hooks/
+  # pre-commit.hooks.shellcheck.enable = true;
+
+  # See full reference at https://devenv.sh/reference/options/
+}