zsh: Add (nix-)direnv

.gitmodules

@@ -22,3 +22,6 @@
 [submodule "zsh-nix-shell"]
 	path = zsh-nix-shell
 	url = https://github.com/chisui/zsh-nix-shell
+[submodule "nix-direnv"]
+	path = nix-direnv
+	url = https://github.com/nix-community/nix-direnv

home/.gitignore

@@ -1,2 +1,3 @@
 *.swp
+.direnv
 Session.vim

home/.nix-direnv

@@ -0,0 +1 @@
+../nix-direnv

home/.zshrc.local

@@ -52,6 +52,27 @@ alias dynamic-colors="~/.dynamic-colors/bin/dynamic-colors"
 ## Support for nix-shell
 source $HOME/.zsh/zsh-nix-shell/nix-shell.plugin.zsh
 
+# Per-directory environment
+command -v direnv >/dev/null && eval "$(direnv hook zsh)"
+
+nixify() {
+    if [ ! -e ./.envrc ]; then
+        echo "use nix" > .envrc
+        direnv allow
+    fi
+    if [[ ! -e shell.nix ]] && [[ ! -e default.nix ]]; then
+        cat > default.nix << EOF
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  nativeBuildInputs = with pkgs; [
+  ];
+}
+EOF
+    ${EDITOR:-vim} default.nix
+    fi
+}
+
 ## Timer
 function timer() (
     if [ -z "$1" ] || [ -z "$2" ]; then

nix-direnv

@@ -0,0 +1 @@
+Subproject commit 300258e2bded28c284451f4fac8475b2240b46f6