Add a devenv shell with Emacs and Eask

.envrc

@@ -0,0 +1,7 @@
+# shellcheck shell=bash
+if has devenv; then
+	eval "$(devenv direnvrc)"
+	use devenv
+else
+	echo "Cannot find devenv. Install it: https://devenv.sh/getting-started/" >&2
+fi

.gitignore

@@ -4,3 +4,9 @@
 .eask/
 .cask/
 dist/
+
+# Nix and devenv
+/.devenv/
+/.devenv.flake.nix
+/devenv.local.nix
+/.direnv/

README.org

@@ -83,6 +83,19 @@ git log --format='%aN <%aE>' -1
 The variable =magit-standup-author= (singular) still works, but it is
 obsolete since version 0.2.0. Use =magit-standup-authors= instead.
 
+* Development
+
+The project uses [[https://devenv.sh/][devenv]]. It gives you Emacs and
+[[https://emacs-eask.github.io/][Eask]].
+
+#+begin_src shell
+devenv shell     # open a shell with the tools
+devenv test      # compile, lint and test
+#+end_src
+
+With [[https://direnv.net/][direnv]], run =direnv allow= once. The tools then
+load when you enter the directory.
+
 * Release
 
 To make a release, run:

devenv.lock

@@ -0,0 +1,65 @@
+{
+  "nodes": {
+    "devenv": {
+      "locked": {
+        "dir": "src/modules",
+        "lastModified": 1789773873,
+        "narHash": "sha256-lFR8A3JzpXn4Az9quklprOje/+Njyh9+bP+CE1TCIxI=",
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "2ba2f9ed32596289874c58981a4d3e56cadd639d",
+        "type": "github"
+      },
+      "original": {
+        "dir": "src/modules",
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "inputs": {
+        "nixpkgs-src": "nixpkgs-src"
+      },
+      "locked": {
+        "lastModified": 1789506231,
+        "narHash": "sha256-vNkJbtmqyBfFhn/HnzQo4ROuoyYWuy/allqTfJb4kMY=",
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "c2f38fe7f9e04d9aadd354d380f2bd40531d9737",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1789370336,
+        "narHash": "sha256-6RSEDHIWQtesQKWSu5qRai8L2h4KgCgMEfJHstW99G4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c7def046b9a883d46974757852106483d741586f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

devenv.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+
+{
+  packages = [
+    pkgs.emacs-nox
+    pkgs.eask-cli
+  ];
+
+  enterTest = ''
+    eask install-deps
+    eask compile
+    eask lint package
+    eask test buttercup
+  '';
+}

devenv.yaml

@@ -0,0 +1,5 @@
+strict_ports: true
+
+inputs:
+  nixpkgs:
+    url: github:cachix/devenv-nixpkgs/rolling