This is the other way to modularize, apparently

Reference:
https://github.com/adisbladis/nixconfig

common/configuration.nix

@@ -5,6 +5,9 @@
 { config, pkgs, ... }:
 
 {
+  imports = [
+    ../modules/default.nix
+  ];
   nix.settings.experimental-features = "nix-command flakes";
 
   # Bootloader.
@@ -71,10 +74,6 @@
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
   # programs.mtr.enable = true;
-  # programs.gnupg.agent = {
-  #   enable = true;
-  #   enableSSHSupport = true;
-  # };
 
   # List services that you want to enable:
 

hosts/NixFrame/configuration.nix

@@ -16,6 +16,8 @@ in
   networking.hostName = "NixFrame"; # Define your hostname.
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
 
+  my.bash-config.enable = true;
+
   # Enable the X11 windowing system.
   services.xserver.enable = true;
 

modules/bash-config/bashrc.sh

@@ -0,0 +1,9 @@
+[[ "$TERM" = "dumb" ]] && return
+
+alias ls='ls --color=auto'
+
+export EDITOR="emacsclient"
+
+if [[ "$INSIDE_EMACS" = 'vterm' ]]; then
+   source ~/.config/bash-config/emacs.sh
+fi

modules/bash-config/default.nix

@@ -0,0 +1,11 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.my.bash-config;
+in
+{
+
+  options.my.bash-config.enable = lib.mkEnableOption "Enable bash configuration file";
+
+  config = lib.mkIf cfg.enable {
+  };
+}

modules/bash-config/emacs.sh

@@ -0,0 +1,52 @@
+# Some of the most useful features in emacs-libvterm require shell-side
+# configurations. The main goal of these additional functions is to enable the
+# shell to send information to `vterm` via properly escaped sequences. A
+# function that helps in this task, `vterm_printf`, is defined below.
+function vterm_printf(){
+    if [ -n "$TMUX" ]; then
+        # Tell tmux to pass the escape sequences through
+        printf "\ePtmux;\e\e]%s\007\e\\" "$1"
+    elif [ "${TERM%%-*}" = "screen" ]; then
+        # GNU screen (screen, screen-256color, screen-256color-bce)
+        printf "\eP\e]%s\007\e\\" "$1"
+    else
+        printf "\e]%s\e\\" "$1"
+    fi
+}
+
+# Completely clear the buffer. With this, everything that is not on screen
+# is erased.
+function clear(){
+    vterm_printf "51;Evterm-clear-scrollback";
+    tput clear;
+}
+
+# With vterm_cmd you can execute Emacs commands directly from the shell.
+# For example, vterm_cmd message "HI" will print "HI".
+# To enable new commands, you have to customize Emacs's variable
+# vterm-eval-cmds.
+vterm_cmd() {
+    local vterm_elisp
+    vterm_elisp=""
+    while [ $# -gt 0 ]; do
+        vterm_elisp="$vterm_elisp""$(printf '"%s" ' "$(printf "%s" "$1" | sed -e 's|\\|\\\\|g' -e 's|"|\\"|g')")"
+        shift
+    done
+    vterm_printf "51;E$vterm_elisp"
+}
+
+# This is to change the title of the buffer based on information provided by the
+# shell. See, http://tldp.org/HOWTO/Xterm-Title-4.html, for the meaning of the
+# various symbols.
+PROMPT_COMMAND='echo -ne "\033]0;${HOSTNAME}:${PWD}\007"'
+
+# Sync directory and host in the shell with Emacs's current directory.
+# You may need to manually specify the hostname instead of $(hostname) in case
+# $(hostname) does not return the correct string to connect to the server.
+#
+# The escape sequence "51;A" has also the role of identifying the end of the
+# prompt
+vterm_prompt_end(){
+    vterm_printf "51;A$(whoami)@$(hostname):$(pwd)"
+}
+PS1=$PS1'\[$(vterm_prompt_end)\]'

modules/default.nix

@@ -0,0 +1,30 @@
+# What's the difference between lib and pkg?
+{ config, lib, ... }:
+
+{
+  # For each found file/folder, make it an absolute path by adding
+  # "./." to the front.
+  imports = map (x: ./. + "/${x}") (
+    lib.attrNames (
+      # Don't include default.nix, and files that don't end with
+      # .nix. This means every subfolder MUST have a
+      # default.nix.
+      #
+      # Perhaps, there's a way to do a tree traversal and grab ALL
+      # .nix files?
+      lib.filterAttrs
+        (
+          n: t: n != "default.nix" && (
+            t == "directory" || lib.hasSuffix ".nix" n
+          )
+        )
+        # Extract all files and folders in module directory. Returns
+        # an attribute map with file name as key, and file type as
+        # value.
+        #
+        # For some reason, the current directory is denoted as "./."
+        # instead of "./". Why?
+        (builtins.readDir ./.)
+    )
+  );
+}