refactor(nix): improve zsh compinit handling

hosts/orion/modules/programs.nix

@@ -2,7 +2,10 @@
 {
   programs = {
     dconf.enable = true;
-    zsh.enable = true;
+    zsh = {
+      enable = true;
+      enableGlobalCompInit = false;
+    };
     nix-ld.enable = true;
   };
 }

users/price/conf/password-store/default.nix

@@ -2,9 +2,7 @@
 {
   programs.password-store = {
     enable = true;
-    package = pkgs.pass.withExtensions(exts: [
-      exts.pass-file
-    ]);
+    package = pkgs.pass.withExtensions (exts: [ exts.pass-file ]);
     settings = {
       PASSWORD_STORE_KEY = "C3FADDE7A8534BEB";
     };

users/price/conf/zsh/default.nix

@@ -0,0 +1,23 @@
+{ ... }:
+{
+  programs.zsh = {
+    enable = true;
+    enableCompletion = true;
+    completionInit = ''
+      () {
+        autoload -U compinit
+        local zsh_cache="''${XDG_CACHE_HOME:-$HOME}/zsh/"
+        if [[ ! -d "$zsh_cache" ]]; then
+          mkdir -p "$zsh_cache"
+        fi
+        local _comp_files=($zsh_cache/zcompcache(Nm-20))
+        if (( $#_comp_files )); then
+          compinit -i -C -d "$zsh_cache/zcompcache"
+        else
+          compinit -i -d "$zsh_cache/zcompcache"
+        fi
+      }
+    '';
+    initExtra = builtins.readFile ./init-extra.zsh;
+  };
+}

users/price/conf/zsh/init-extra.zsh

@@ -0,0 +1,5 @@
+() {
+    if [[ -n "$XDG_CONFIG_HOME" && -r "$XDG_CONFIG_HOME/zsh/zsh" ]]; then
+        source "$XDG_CONFIG_HOME/zsh/zsh"
+    fi
+}

users/price/home.nix

@@ -261,13 +261,6 @@ in
       enable = true;
       systemd.enable = true;
     };
-    zsh = {
-      enable = true;
-      initExtra = ''
-        __HM_SESS_VARS_SOURCED= source "$HOME/.nix-profile/etc/profile.d/hm-session-vars.sh"
-        source "$HOME/.config/zsh/zsh"
-      '';
-    };
     git = {
       enable = true;
       userName = "Price Hiller";