ignore envrcs by default; add a layout postgres helper for direnv

nix/home.nix

@@ -16,6 +16,24 @@ with lib;
     zsh-syntax-highlighting
   ];
 
+  programs.direnv = {
+    enable = true;
+    stdlib = ''
+      layout_postgres() {
+        export PGDATA="$(direnv_layout_dir)/tmp/pgdata"
+        export PGHOST="$PGDATA"
+        if [[ ! -d "$PGDATA" ]]; then
+          initdb --locale=$LANG
+          cat <<'EOF' >>"$PGDATA/postgresql.conf"
+      listen_addresses = 'localhost'
+      unix_socket_directories = '$PGHOST'
+      EOF
+          echo "CREATE DATABASE $USER;" | postgres --single -E postgres
+        fi
+      }
+    '';
+  };
+
   programs.command-not-found.enable = true;
 
   programs.git = {
@@ -25,6 +43,7 @@ with lib;
     ignores = [
       ".idea/"
       ".direnv/"
+      ".envrc"
       ".tools-info"
       "*~"
       "*.swp"
@@ -37,6 +56,7 @@ with lib;
     defaultKeymap = "viins";
 
     initExtra = mkForce (''
+      export LOCALE_ARCHIVE="/usr/lib/locale/locale-archive"
       export NIX_PATH=$HOME/.nix-defexpr/channels:$NIX_PATH
       export EDITOR=vim