feat: rename 'common' to 'base'

home/linux/base/shell.nix

@@ -0,0 +1,32 @@
+{config, ...}: 
+
+let
+  d = config.xdg.dataHome;
+  c = config.xdg.configHome;
+  cache = config.xdg.cacheHome;
+in rec {
+  # add environment variables
+  systemd.user.sessionVariables = {
+    # clean up ~
+    LESSHISTFILE = cache + "/less/history";
+    LESSKEY = c + "/less/lesskey";
+    WINEPREFIX = d + "/wine";
+
+    # set this variable make i3 failed to start
+    # related issue:
+    #   https://github.com/sddm/sddm/issues/871
+    # XAUTHORITY = "$XDG_RUNTIME_DIR/Xauthority";
+
+    # set default applications
+    BROWSER = "firefox";
+    TERMINAL = "alacritty";
+    TERM = "xterm-256color";
+
+    # enable scrolling in git diff
+    DELTA_PAGER = "less -R";
+
+    MANPAGER = "sh -c 'col -bx | bat -l man -p'";
+  };
+
+  home.sessionVariables = systemd.user.sessionVariables;
+}