From 239e44d70459905334ef14f8763143b2c010a8f4 Mon Sep 17 00:00:00 2001
From: Nikolaos Karaolidis <nick@karaolidis.com>
Date: Sun, 15 Dec 2024 19:09:07 +0000
Subject: [PATCH] Add direnv cache

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>
---
 .envrc                                        |  1 +
 .../configs/console/nix-direnv/default.nix    | 22 ++++++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)
 create mode 100644 .envrc

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..5a0e219
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake self#nix
diff --git a/hosts/common/user/configs/console/nix-direnv/default.nix b/hosts/common/user/configs/console/nix-direnv/default.nix
index 391c194..5a66151 100644
--- a/hosts/common/user/configs/console/nix-direnv/default.nix
+++ b/hosts/common/user/configs/console/nix-direnv/default.nix
@@ -4,14 +4,30 @@
 }:
 { inputs, ... }:
 {
-  home-manager.users.${user} = {
-    programs.direnv = {
+  home-manager.users.${user}.programs = {
+    direnv = {
       enable = true;
       silent = true;
       nix-direnv.enable = true;
       enableZshIntegration = true;
     };
+
+    # https://github.com/direnv/direnv/wiki/Customizing-cache-location
+    zsh.initExtra = ''
+      declare -A direnv_layout_dirs
+      direnv_layout_dir() {
+        local hash path
+        echo "''${direnv_layout_dirs[$PWD]:=$(
+          hash="$(sha1sum - <<< "$PWD" | head -c40)"
+          path="''${PWD//[^a-zA-Z0-9]/-}"
+          echo "${home}/.cache/direnv/layouts/''${hash}''${path}"
+        )}"
+      }
+    '';
   };
 
-  environment.persistence."/persist"."${home}/.config/direnv/direnv.toml" = { };
+  environment.persistence = {
+    "/persist"."${home}/.config/direnv/direnv.toml" = { };
+    "/cache"."${home}/.cache/direnv" = { };
+  };
 }