stuff

common/default.nix

@@ -49,6 +49,7 @@ else
       ./units-config.nix
       ./units-impl.nix
       ./verify-system
+      ./qcd.nix
     ];
     options = {
       vacu.rootCAs = mkOption { type = types.listOf types.str; };

common/qcd.nix

@@ -0,0 +1,42 @@
+{
+  lib,
+  config,
+  vacuModuleType,
+  vaculib,
+  ...
+}:
+let
+  inherit (lib) mkOption types;
+  home = if vacuModuleType == "nix-on-droid" then "/data/data/com.termux.nix/files/home" else "/home/shelvacu";
+in
+{
+  options.vacu.qcd = mkOption {
+    default = {};
+    type = types.attrsOf types.path;
+  };
+  config.vacu.shell.functions.qcd = ''
+    svl_exact_args $# 1
+    declare the_arg="$1"
+    
+    declare base="''${the_arg%%/*}"
+    declare rest="''${the_arg:''${#base}}"
+    declare path
+
+    if false; then :
+    ${lib.pipe config.vacu.qcd [
+      (lib.mapAttrsToList (alias: path: ''elif [[ $base == ${lib.escapeShellArg alias} ]]; then path=${lib.escapeShellArg path}''))
+      (lib.concatStringsSep "\n")
+    ]}
+    fi
+    if ! [[ -v path ]]; then
+      svl_die "unrecognized alias $base"
+    fi
+
+    cd -- "$path$rest"
+  '';
+  config.vacu.qcd = {
+    ns = "${home}/dev/nix-stuff";
+    np = "${home}/dev/nixpkgs";
+    dev = "${home}/dev";
+  };
+}