setup env variables

Author: ngalaiko

home/default.nix

@@ -9,6 +9,7 @@
     ./neovim
     ./packages.nix
     ./rust.nix
+    ./xdg.nix
   ];
 
   # session vars point LOCALE_ARCHIVE at i18n.glibcLocales; the default

home/go.nix

@@ -3,7 +3,7 @@
   home.packages = [ pkgs.go ];
 
   programs.fish.shellInit = ''
-    set --global --export GOPATH "$HOME/go"
+    set --global --export GOPATH "$HOME/.local/share/go"
     fish_add_path --global --move --path "$GOPATH/bin"
   '';
 }

home/neovim/options.nix

@@ -20,7 +20,7 @@
 
       swapfile = false;
       backup = false;
-      undodir.__raw = ''os.getenv("HOME") .. "/.vim/undodir"'';
+      undodir.__raw = ''vim.fn.stdpath("state") .. "/undo"'';
       undofile = true;
 
       termguicolors = true;
@@ -33,7 +33,7 @@
     # plugins expect the state dirs at setup time (neo-tree opens its log there).
     extraConfigLuaPre = ''
       vim.fn.mkdir(vim.fn.stdpath("data"), "p")
-      vim.fn.mkdir(os.getenv("HOME") .. "/.vim/undodir", "p")
+      vim.fn.mkdir(vim.fn.stdpath("state") .. "/undo", "p")
     '';
 
     extraConfigLua = ''

home/rust.nix

@@ -3,9 +3,11 @@
   home.packages = [ pkgs.rustup ];
 
   programs.fish.shellInit = ''
-    fish_add_path --global --move --path "$HOME/.cargo/bin"
-    if test -e "$HOME/.cargo/env.fish"
-      source "$HOME/.cargo/env.fish"
+    set --global --export CARGO_HOME "$HOME/.local/share/cargo"
+    set --global --export RUSTUP_HOME "$HOME/.local/share/rustup"
+    fish_add_path --global --move --path "$CARGO_HOME/bin"
+    if test -e "$CARGO_HOME/env.fish"
+      source "$CARGO_HOME/env.fish"
     end
   '';
 }

home/xdg.nix

@@ -0,0 +1,10 @@
+{ ... }:
+{
+  # XDG base dirs — define with the spec defaults if the session hasn't.
+  programs.fish.shellInit = ''
+    set --query XDG_CONFIG_HOME; or set --global --export XDG_CONFIG_HOME "$HOME/.config"
+    set --query XDG_CACHE_HOME;  or set --global --export XDG_CACHE_HOME "$HOME/.cache"
+    set --query XDG_DATA_HOME;   or set --global --export XDG_DATA_HOME "$HOME/.local/share"
+    set --query XDG_STATE_HOME;  or set --global --export XDG_STATE_HOME "$HOME/.local/state"
+  '';
+}