treewide: override several programs to conform to xdg dir spec

home/config/xdg/default.nix

@@ -1,6 +1,9 @@
 { config, ... }:
 {
-  imports = [ ./mimetypes.nix ];
+  imports = [
+    ./mimetypes.nix
+    ./directory-spec-overrides.nix
+  ];
   xdg = {
     enable = true;
     userDirs = {

home/config/xdg/directory-spec-overrides.nix

@@ -0,0 +1,63 @@
+{ config, pkgs, lib, ... }:
+{
+  nix.settings.use-xdg-base-directories = true;
+
+  home.sessionVariables = let
+    inherit (config.xdg) dataHome cacheHome configHome userDirs;
+  in {
+    TEXMFHOME = "${dataHome}/texmf";
+    TEXMFVAR = "${cacheHome}/texlive";
+    TEXMFCONFIG = "${configHome}/texlive";
+
+    PSQL_HISTORY = "${dataHome}/psql_history";
+    SQLITE_HISTORY= "${dataHome}/sqlite_history";
+    MYSQL_HISTFILE = "${dataHome}/mysql_history";
+    NODE_REPL_HISTORY = "${dataHome}/node_repl_history";
+    GDB_HISTFILE = "${dataHome}/gdb_history";
+    PYTHON_HISTORY = "${dataHome}/python_history";
+
+    GHCUP_USE_XDG_DIRS = "true";
+
+    ANDROID_USER_HOME = "${dataHome}/android";
+    AZURE_CONFIG_DIR = "${dataHome}/azure";
+    CARGO_HOME = "${dataHome}/cargo";
+    CUDA_CACHE_PATH = "${cacheHome}/nv";
+    DOCKER_CONFIG = "${configHome}/docker";
+    DOTNET_CLI_HOME = "${dataHome}/dotnet";
+    DOT_SAGE = "${configHome}/sagemath";
+    ELM_HOME = "${configHome}/";
+    GOPATH = "${dataHome}/go";
+    GRADLE_USER_HOME = "${dataHome}/gradle";
+    ICEAUTHORITY = "${cacheHome}/ICEauthority";
+    NIMBLE_DIR = "${dataHome}/nimble";
+    NLTK_DATA = "${dataHome}/nltk_data";
+    NRFUTIL_HOME = "${dataHome}/nrfutil";
+    NUGET_PACKAGES = "${cacheHome}/nuget-packages";
+    PARALLEL_HOME = "${configHome}/parallel";
+    PYENV_ROOT = "${dataHome}/pyenv";
+    RUSTUP_HOME = "${dataHome}/rustup";
+    STACK_ROOT = "${dataHome}/stack";
+    W3M_DIR = "${dataHome}/w3m";
+    WINEPREFIX = "${dataHome}/wine";
+
+    # TODO: these needs to be set before the user session has fully initialized
+    # XINITRC = "$XDG_CONFIG_HOME/x11/initrc";
+    # XAUTHORITY
+    # ERRFILE = "${cacheHome}/X11/xsession-errors";
+    # USERXSESSION
+    # XCOMPOSECACHE="${cacheHome}/X11/xcompose";
+    # XCURSOR_PATH
+  };
+
+  xdg.configFile = {
+    "npm/npmrc".text = ''
+      prefix=${config.xdg.dataHome}/npm
+      cache=${config.xdg.cacheHome}/npm
+      init-module=${config.xdg.configHome}/npm/config/npm-init.js
+    '';
+    "bpython/config".text = ''
+      [general]
+      hist_file = ${config.xdg.dataHome}/bpython_history
+    '';
+  };
+}