Started work on splitting configure-stormux into modules.

.includes/chuser.sh

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+#!/bin/bash
+# Configure Stormux
+# A script to configure the system for new users.
+#
+# Copyright 2020, Storm Dragon, <storm_dragon@linux-a11y.org>
+#
+# This is free software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 3, or (at your option) any later
+# version.
+#
+# This software is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this package; see the file COPYING.  If not, write to the Free
+# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+#
+#--code--
+
+
+    # The user can not be logged in when the name change occurs.
+    # Write a file to /etc/cron.d/chuser
+    # The file will run at boot, change the username, and delete itself.
+
+    if [[ $# -ne 1 ]]; then
+	        msgbox "Missing required argument, username."
+	        exit 1
+    fi
+
+    if [[ "$(whoami)" == "root" ]]; then
+	        msgbox "Please run this script as the user you would like to rename, not as root."
+	        exit 1
+    fi
+
+    local oldUser="$USER"
+
+    local groups="$(groups "$oldUser")"
+    groups="${groups// /,}"
+
+    local newUser="$1"
+    if ! [[ "$newUser" =~ ^[a-z][-a-z0-9]*$ ]]; then
+	        msgbox "Username $newUser failed validation. It cannot contain spaces or some punctuation."
+	        exit 1
+    fi
+
+# Heredocument left-aligned
+cat << EOF | sudo tee /etc/cron.d/0chuser &> /dev/null
+SHELL=/bin/bash
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+@reboot root usermod -a -G $groups -m -d /home/$newUser -l $newUser $oldUser && sed -i -e "s#NODM_USER=.*#NODM_USER='$newUser'#" -e "s#NODM_XSESSION=.*#NODM_XSESSION='/home/$newUser/.xinitrc'#" /etc/nodm.conf; rm -f /etc/cron.d/0chuser;reboot
+
+EOF
+# Heredocument end.
+
+    # Files in cron.d must be 644 to work.
+    sudo chmod 644 /etc/cron.d/0chuser
+
+    # Reboot the computer so the script can run
+    local answer="$(yesno "Would you like to reboot now so the username can be changed? If no, you will need to reboot manually for the changes to be applied.")"
+    if [[ "$answer" == "Yes" ]]; then
+            sudo reboot
+    fi

.includes/ui.sh

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+#!/bin/bash
+# Configure Stormux
+# A script to configure the system for new users.
+#
+# Copyright 2020, Storm Dragon, <storm_dragon@linux-a11y.org>
+#
+# This is free software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 3, or (at your option) any later
+# version.
+#
+# This software is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this package; see the file COPYING.  If not, write to the Free
+# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+#
+#--code--
+
+# UI code starts here.
+
+# Settings to improve accessibility of dialog.
+export DIALOGOPTS='--insecure --no-lines --visit-items'
+
+inputbox() {
+    # Returns: text entered by the user
+    # Args 1, Instructions for box.
+    # args: 2 initial text (optional)
+    dialog --backtitle "Stormux" \
+        --clear \
+        --inputbox "$1" 0 0 "$2" --stdout
+}
+
+passwordbox() {
+    # Returns: text entered by the user
+    # Args 1, Instructions for box.
+    # args: 2 initial text (optional)
+    dialog --backtitle "Stormux" \
+        --clear \
+        --passwordbox "$1" 0 0 "$2" --stdout
+}
+
+msgbox() {
+# Returns: None
+# Shows the provided message on the screen with an ok button.
+dialog --clear --msgbox "$*" 10 72
+}
+
+infobox() {
+    # Returns: None
+    # Shows the provided message on the screen with no buttons.
+   local timeout=3 
+    dialog --infobox "$*" 0 0
+    read -n1 -t $timeout continue
+    # Clear any keypresses from the buffer
+    read -t 0.01 continue
+}
+
+yesno() {
+    # Returns: Yes or No
+    # Args: Question to user.
+    # Called  in if $(yesno) == "Yes"
+    # Or variable=$(yesno)
+    dialog --clear --backtitle "Stormux" --yesno "$*" 10 80 --stdout
+    if [[ $? -eq 0 ]]; then
+        echo "Yes"
+    else
+        echo "No"
+    fi
+}
+
+menulist() {
+    # Args: List of items for menu.
+    # returns: selected tag
+    local menuList
+    for i in "${@}" ; do
+        menuList+=("$i" "$i")
+    done
+    dialog --backtitle "Stormux" \
+        --clear \
+        --no-tags \
+        --menu "Please select an option" 0 0 0 ${menuList[@]} --stdout
+    return $?
+}
+
+show_doc() {
+    # Displays file in w3m using pager mode
+    # Args: path to file.
+    # Returns: none.
+    fold -sw $cols "$1" | w3m -o keymap_file=~/.w3m/pager
+}