#!/bin/sh
# ArchSetup - Craig Jennings <craigmartinjennings@gmail.com>
# License: GNU GPLv3

# Commentary
#
# There are two levels of errors:
# * CRASH: Issues that will halt forward progress, aborting this script.
# * ERROR: Issues not serious enough to halt the script.
# Both are printed on screen and in the $logfile.
# Stderr is also printed to the $logfile for all relevant info.
#
# This script creates a tmpfs RAM disk for all compilation. This speeds up
# building and installing, and all source code no longer exists after reboot.
#
# # Code

# uncomment to stop on any error
# set -e

### Constants

username="cjennings"
password="welcome"  # will be changed on first login. :)

dwm_repo="https://git.cjennings.net/dwm.git"
dmenu_repo="https://git.cjennings.net/dmenu.git"
st_repo="https://git.cjennings.net/st.git"
slock_repo="https://git.cjennings.net/slock.git"
dotfiles_repo="https://git.cjennings.net/dotfiles"
dotemacs_repo="https://git.cjennings.net/dotemacs.git"
dotfiles_home="/home/$username/.dotfiles"

logfile="/var/log/archsetup-$(date +'%Y-%m-%d-%H-%M-%S').log"
source_dir="/home/$username/.local/src" # aur/git source goes here
packages_before="/var/log/archsetup-preexisting-package-list.txt"
packages_after="/var/log/archsetup-post-install-package-list.txt"
archsetup_packages="/var/log/archsetup-installed-packages.txt"

### Intro
intro() {
    printf "\n\nArchSetup launched @ %s\n" "$(date +'%D %T')"| tee -a "$logfile"
    STARTTIME=$(date +%s)
    errors_encountered=0

    # begin with a clean logfile
    [ -f "$logfile" ] && rm -f "$logfile"
    touch "$logfile"

    # count the arch packages before install
    pacman -Q > "$packages_before" || \
        error "crash" "generating pre-install package list" "$?"
}

### General Functions
# Error
error () {
    # $1 = type ERROR, noted but the script will continue to run.
    #      anything else will produce CRASH, which halts the script
    # $2 = what was happening (e.g., "adding $username to group $groupname")
    # $3 = the error code (i.e., "$?")

    errors_encountered=$((errors_encountered+1))
    case "$1" in
        "error")
            printf "ERROR: %s failed with error code %s @ %s\n" \
                   "$2" "$3"  "$(date +'%T')"  | tee -a "$logfile"
            return 1;
            ;;
        *)
            printf "CRASH: %s failed with error: %s @ %s. Script halted.\n" \
                   "$2" "$3"  "$(date +'%T')"  | tee -a "$logfile"
            exit 1;
            ;;
    esac
}

#  Display
display () {
    # $1 = type (TITLE, ACTION)
    # $2 = description (answers: "what are you trying to do?")

    case "$1" in
        "title")
            printf "\n##### %s\n" "$2" | tee -a "$logfile"
            return 1;
            ;;
        "subtitle")
            printf "\n%s\n" "$2"  | tee -a "$logfile"
            ;;
        "task")
            printf "...%s @ %s\n" "$2" "$(date +'%T')" | tee -a "$logfile"
            return 1;
            ;;
        *)
            printf "CRASH: display () called with incorrect arguments.\n"
            printf "...called %s type, %s action @ %s\n" \
                   "$1" "$2"  "$(date +'%T')"   | tee -a "$logfile"
            exit 1;
            ;;
    esac

}

# Pacman Install
pacman_install() {
    action="installing $1 via pacman" && display "task" "$action"
    if ! (pacman --noconfirm --needed -S "$1" >> "$logfile" 2>&1); then
        action="retrying $1" && display "task" "$action"
        if ! (pacman --noconfirm --needed -S "$1" >> "$logfile" 2>&1); then
            action="retrying $1 once more" && display "task" "$action"
            (pacman --noconfirm --needed -S "$1" >> "$logfile" 2>&1) ||
                error "error" "$action" "$?"
        fi
    fi
}

# Git Install
git_install() {
    prog_name="$(basename "$1" .git)"
    build_dir="$source_dir/$prog_name"
    action="building & installing $prog_name from source"
    display "task" "$action"

    if ! (sudo -u "$username" git clone --depth 1 "$1" "$build_dir" >> "$logfile" 2>&1); then
        error "error" "cloning source code for $prog_name" "$?"
        (cd "$build_dir" && sudo -u "$username" git pull --force origin master >> "$logfile" 2>&1) || \
            error "error" "pulling source code for $prog_name" "$?"
    fi

    (cd "$build_dir" && make install >> "$logfile" 2>&1) || \
        error "error" "building $prog_name from source code" "$?"
}

# AUR Install
aur_install() {
    action="installing $1 via the AUR" && display "task" "$action"
    if ! (sudo -u "$username" yay -S --noconfirm "$1" >> "$logfile" 2>&1); then
        action="retrying $1" && display "task" "$action"
        if ! (sudo -u "$username" yay -S --noconfirm "$1" >> "$logfile" 2>&1); then
            action="retrying $1 once more" && display "task" "$action"
            (sudo -u "$username" yay -S --noconfirm "$1" >> "$logfile" 2>&1) ||
                error "error" "$action" "$?"
        fi
    fi
}

# PIP Install
pip_install() {
    [ -x "$(command -v "pip")" ] || pacman_install python-pip
    action="installing $1 via PIP" && display "task" "$action"
    (yes | sudo -u "$username" pip install "$1" >> "$logfile" 2>&1)  || \
        error "error" "$action" "$?"
}

### Prerequisites
prerequisites() {
    # why these software packages are 'required'
    # linux-firmware    - ensuring hardware can be detected properly
    # base_devel        - required tools to compile
    # ca_certificates   - for validation of keyrings, etc.
    # coreutils         - comparing package lists
    # curl              - to transfer source code
    # git               - tools required to work with git source respositories
    # go                - required to build yay, the aur installer
    # ntp               - must communicate with other servers in synchronized manner
    # python            - required for python pip installs
    # stow              - places the dotfiles (see: https://bit.ly/41GmysO)
    # tar               - extract unix archives
    # vi                - should things go wrong, we'll need an editor
    # zsh               - we need a shell interpreter for yay; this one's mine

    display "title" "Prerequisites"

    display "subtitle" "Bootstrapping"

    action="ensuring current Arch Linux keyring" && display "task" "$action"
    (pacman -Syy) >> "$logfile" 2>&1  || error "crash" "$action" "$?"
    (pacman -S --noconfirm archlinux-keyring) >> "$logfile" 2>&1  || \
        error "crash" "$action" "$?"

    display "task" "verifying Arch Linux keys"
    (pacman-key --populate archlinux >> "$logfile" 2>&1) || \
        error "crash" "verifying Arch Linux keys" "$?"

    action="refreshing the package cache" && display "task" "$action"
    (pacman -Syu --noconfirm >> "$logfile" 2>&1)  || error "crash" "$action" "$?"

    display "subtitle" "Required Software"

    for software in linux-firmware base-devel ca-certificates \
                    coreutils curl git go ntp openssh python \
                    stow tar vi zsh; do
        pacman_install "$software"
    done

    display "subtitle" "Environment Configuration"

    # sync the time on this machine
    action="synchronizing system time" && display "task" "$action"
    (ntpdate 0.us.pool.ntp.org >> "$logfile" 2>&1) || error "error" "$action" "$?"

    action="configuring compiler to use all processor cores" && display "task" "$action"
    sed -i "s/-j2/-j$(nproc)/;s/^#MAKEFLAGS/MAKEFLAGS/" /etc/makepkg.conf >> "$logfile" 2>&1

    # enable pacman concurrent downloads and color
    action="enabling concurrent downloads" && display "task" "$action"
    sed -i "s/^#ParallelDownloads.*$/ParallelDownloads = 10/;s/^#Color$/Color/" /etc/pacman.conf

    action="Package Mirrors" && display "subtitle" "$action"
    pacman_install reflector

    action="configuring reflector" && display "task" "$action"
    (printf '
          --connection-timeout 3 \
          --download-timeout 3 \
          --protocol https \
          --age 12 \
          --latest 20 \
          --score 10 \
          --fastest 5 \
          --sort score \
          --save /etc/pacman.d/mirrorlist
    ' > /etc/xdg/reflector/reflector.conf >> "$logfile" 2>&1) || \
        error "error" "$action" "$?"

    action="updating repository mirrors" && display "task" "$action"
    (reflector --connection-timeout 3 \
               --download-timeout 3 \
               --protocol https \
               --age 12 \
               --latest 20 \
               --score 10 \
               --fastest 5 \
               --sort score \
               --save /etc/pacman.d/mirrorlist > /dev/null 2>&1)

    action="enabling the reflector timer" && display "task" "$action"
    (systemctl enable reflector.timer >> "$logfile" 2>&1) || \
        error "error" "$action" "$?"

    action="replacing sudoers file if new package version exists" && display "task" "$action"
    [ -f /etc/sudoers.pacnew ] && cp /etc/sudoers.pacnew /etc/sudoers >> "$logfile" 2>&1

    action="creating a directory to build/install software from git/AUR."
    (mkdir -p $source_dir) || error "crash" "creating the directory $source_dir"

}

### Create User
create_user () {
    display "title" "User Creation"

    display "task" "checking if user exists"
    # halt if $username exists
    ( id -u "$username" >/dev/null 2>&1; ) && \
        error "crash" "user '$username' already exists!"

    # create $username with home, group, shell, password
    action="creating user and home directory" && display "task" "$action"
    (useradd -m -G wheel -s /bin/zsh "$username" >> "$logfile" 2>&1) || \
        error "crash" "adding user '$username" "$?"

    display "task" "assigning the password"
    echo "$username:$password" | chpasswd  # any text is allowable! be careful!

    display "task" "adding to appropriate groups"
    (usermod -aG \
             sys,adm,network,scanner,power,uucp,audio,lp,rfkill,video,storage,optical,users \
             "$username" >> "$logfile" 2>&1) || error "crash" "adding $username to groups" "$?"

    display "task" "configuring shell"
    # zsh cache required: $username will install via yay; zsh will run those commands
    mkdir -p "/home/$username/.cache/zsh/" | tee -a "$logfile"

    # give $username sudo nopasswd rights (required for aur installs)
    display "task" "granting permissions"
    (echo "%$username ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers) \
        || error "error" "$action" "$?"

    # mount as ramdisk to speed aur/git build/installs
    (sudo mount -t tmpfs -o size=4G archsetup $source_dir >> "$logfile" 2>&1) || \
        error "crash" "mounting the RAM disk for archsetup" "$?"

    (chown -R "$username":wheel "$(dirname "$source_dir")" >> "$logfile" 2>&1) || \
        error "crash" "changing ownership of $source_dir" "$?"
}

### User Customizations
user_customizations() {
    action="User Customizations" && display "title" "$action"

    action="cloning dotfiles" && display "task" "$action"
    (git clone --depth 1 $dotfiles_repo "$dotfiles_home" \
         >> "$logfile" 2>&1)  ||  error "error" "$action" "$?"

    action="moving dotfiles into place" && display "task" "$action"
    (cd "$dotfiles_home" &&  stow --no-folding --adopt * \
                                  >> "$logfile" 2>&1 )  || error "error" "$action" "$?"

    action="restoring dotfile versions" && display "task" "$action"
    (cd "$dotfiles_home" &&  git restore . \
                                 >> "$logfile" 2>&1 )  || error "error" "$action" "$?"

    action="creating common directories" && display "task" "$action"
    # Create default directories and grant permissions
    {
        mkdir -p -m 751 /home/$username/code
        mkdir -p -m 751 /home/$username/documents
        mkdir -p -m 751 /home/$username/downloads/torrents/complete
        mkdir -p -m 751 /home/$username/downloads/torrents/incomplete
        mkdir -p -m 751 /home/$username/downloads/torrents/files
        mkdir -p -m 751 /home/$username/downloads/ebooks
        mkdir -p -m 751 /home/$username/music
        mkdir -p -m 751 /home/$username/projects
        mkdir -p -m 751 /home/$username/pictures/screenshots
        mkdir -p -m 751 /home/$username/videos
        mkdir -p -m 751 /home/$username/vms
        chown -R $username: /home/$username

        mkdir -p -m 751 /media/backup
        mkdir -p -m 751 /media/remote0
        mkdir -p -m 751 /media/remote1
        mkdir -p -m 751 /media/remote2
        chown -R $username: /media
    }  >> "$logfile" 2>&1
}

### AUR Installer
aur_installer () {
    display "title" "AUR Installer"

    yay_repo="https://aur.archlinux.org/yay.git"
    build_dir="$source_dir/yay"

    display "task" "fetching source code for yay"
    if ! (sudo -u "$username" git clone --depth 1 "$yay_repo" "$build_dir" >> "$logfile" 2>&1); then
        error "error" "cloning source code for yay"
        (sudo -u "$username" -D "$build_dir" git pull --force origin master >> "$logfile" 2>&1) || \
            error "crash" "changing directories to $build_dir and pulling source code" "$?"
    fi

    action="packaging and installing yay"; display "task" "$action"
    (cd "$build_dir" && sudo -u "$username" makepkg --noconfirm -si >> "$logfile" 2>&1) || \
        error "crash" "$action" "$?"
}

### Essential Services
essential_services() {
    display "title" "Essential Services"

    # Randomness

    display "subtitle" "Randomness"
    pacman_install rng-tools
    systemctl enable rngd >> "$logfile" 2>&1  || error "error" "$action" "$?"
    systemctl start rngd >> "$logfile" 2>&1  || error "error" "$action" "$?"

    # Networking

    display "subtitle" "Networking"
    pacman_install networkmanager

    # Power

    display "subtitle" "Power"
    pacman_install upower
    systemctl enable upower >> "$logfile" 2>&1  || error "error" "$action" "$?"

    # Secure Shell

    display "subtitle" "Secure Shell"
    pacman_install openssh
    action="enabling the openssh service to run at boot" && display "task" "$action"
    systemctl enable sshd >> "$logfile" 2>&1  || error "error" "$action" "$?"
    action="starting the openssh service" && display "task" "$action"
    systemctl start sshd >> "$logfile" 2>&1   || error "error" "$action" "$?"

    # Firewall

    # deny all connections by default, then allow the following:
    # http/s                    : 80/tcp, 443/tcp
    # tor                       : 9040,9050,9051,9053,9119/tcp
    # email                     : IMAP, IMAPS
    # mDNS printer discovery    : 5353/udp
    # ssh                       : ssh
    # syncthing                 : 22000/tcp, 22000/udp, 21027/udp
    # torrents                  : transmission
    # calibre content server    : 8080/tcp

    display "subtitle" "Firewall"
    pacman_install ufw

    action="configuring ufw to deny by default" && display "task" "$action"
    ufw default deny incoming >> "$logfile" 2>&1 || error "error" "$action"

	# note on the numbered protocols
	#   "80,443,8080/tcp"                   ## http and https traffic
	#   "9040,9050,9051,9053,9119/tcp"      ## tor network
	#   "55353/udp"                         ## DNS
	#   "22000/tcp" "22000/udp" "21027/udp" ## syncthing

    for protocol in \
        "80,443,8080/tcp" \
            "9040,9050,9051,9053,9119/tcp" \
            "IMAP" "IMAPS" \
            "55353/udp" \
            "ssh" \
            "22000/tcp" "22000/udp" "21027/udp" \
            "transmission" \
        ; do
        action="adding ufw rule to allow $protocol" && display "task" "$action"
        (ufw allow $protocol  >> "$logfile" 2>&1) || error "error" "$action" "$?"
    done

    action="adding limits to protect from brute force attacks" && display "task" "$action"
    (ufw limit 22/tcp  >> "$logfile" 2>&1 && \
         ufw limit 443/tcp >> "$logfile" 2>&1) || \
        error "error" "action"

    action="enabling firewall service to launch on boot" && display "task" "$action"
    systemctl enable ufw.service >> "$logfile" 2>&1  || error "error" "$action" "$?"

    action="starting firewall service" && display "task" "$action"
    systemctl start ufw.service >> "$logfile" 2>&1 || error "error" "$action" "$?"

    # Service Discovery

	display "subtitle" "Network Service Discovery"
	pacman_install nss-mdns # GNU Name Service Switch host name resolution
	pacman_install avahi # service discovery on a local network using mdns

    action="configuring avahi" && display "task" "$action"
    systemctl disable systemd-resolved.service >> "$logfile" 2>&1 || error "error" "$action" "$?"
    systemctl enable avahi-daemon.service >> "$logfile" 2>&1 || error "error" "$action" "$?"

    # Job Scheduling

    display "subtitle" "Job Scheduling"
    pacman_install cronie
    action="enabling cronie to launch at boot" && display "task" "$action"
    systemctl enable cronie  >> "$logfile" 2>&1  || error "error" "$action" "$?"
    pacman_install at
    action="enabling the batch delayed command scheduler" && display "task" "$action"
    systemctl enable atd  >> "$logfile" 2>&1  || error "error" "$action" "$?"

    # Package Repository Cache Maintenance

    display "subtitle" "Package Repository Cache Maintenance"
    systemctl enable --now paccache.timer  >> "$logfile" 2>&1 || error "error" "$action" "$?"

    # Timeshift-Autosnap
    display "subtitle" "Snapshot Service"
    aur_install timeshift-autosnap
    pacman_install grub-btrfs
    action="enabling snapshot boot menu updates" && display "task" "$action"
    systemctl enable grub-btrfsd  >> "$logfile" 2>&1 || error "error" "$action" "$?"

    action="starting snapshot boot menu updates" && display "task" "$action"
    # starting and stopping service to generate the grub-btrfs config
    systemctl start grub-btrfsd  >> "$logfile" 2>&1 || error "error" "$action" "$?"
    systemctl stop grub-btrfsd  >> "$logfile" 2>&1 || error "error" "$action" "$?"
    # edit grub-btrfs config for timeshift auto snapshot support
    sed -i \
        's|ExecStart=/usr/bin/grub-btrfsd --syslog /.snapshots|ExecStart=/usr/bin/grub-btrfsd --syslog --timeshift-auto|' \
        /etc/systemd/system/grub-btrfsd.service


    action="regenerating boot menu" && display "task" "$action"
    grub-mkconfig -o /boot/grub/grub.cfg >> "$logfile" 2>&1 || error "error" "$action" "$?"
}

### Xorg Display Manager
xorg() {
    action="Xorg Display Server Dependencies" && display "subtitle" "$action"
    pacman_install libglvnd

    action="Xorg Display Server" && display "subtitle" "$action"
    for software in xorg-server xorg-xinit xorg-xsetroot \
                                xsel xorg-xbacklight xf86-input-libinput \
                                xorg-xdpyinfo xorg-xprop xorg-xwininfo \
                                xorg-xinput xorg-xkill ; do
        pacman_install $software
    done
}

### DWM Window Manager
dwm() {

    action="DWM Window Manager Dependencies" && display "subtitle" "$action"
    for software in coreutils fontconfig freetype2 glibc libx11 libxft libxinerama; do
        pacman_install $software
    done;

    action="DWM Window Manager" && display "subtitle" "$action"

    git_install $dwm_repo
    git_install $dmenu_repo
    git_install $st_repo
    git_install $slock_repo
    aur_install pinentry-dmenu  # password entry that leverages dmenu
}

### Desktop Environment
desktop_environment() {
    display "title" "Desktop Environment"

	# Fonts

	action="Fonts" && display "subtitle" "$action"
	pacman_install noto-fonts-emoji
	pacman_install ttf-firacode-nerd
	pacman_install ttf-hack-nerd
	pacman_install ttf-jetbrains-mono-nerd
	pacman_install ttf-meslo-nerd
	pacman_install ttf-nerd-fonts-symbols-mono
	aur_install ttf-all-the-icons
	aur_install ttf-lato
	aur_install ttf-ms-fonts
	aur_install ttf-ubraille


    # System Utilities

    action="System Utilities" && display "subtitle" "$action"
    pacman_install dmidecode
    pacman_install dosfstools
    pacman_install exfat-utils
    pacman_install lshw
    pacman_install ntfs-3g
    pacman_install sshfs
    pacman_install testdisk
    pacman_install udisks2
    aur_install downgrade
    aur_install duf
    aur_install inxi

    # File Associations

    action="File/Application Associations" && display "subtitle" "$action"
    pacman_install perl-file-mimeinfo
    pacman_install xdg-utils

    # Authentication Tools

    action="Authentication Tools" && display "subtitle" "$action"
    pacman_install gnupg
    pacman_install polkit
    pacman_install gnome-keyring

    # ensure correct permissions on .gpg directory
    # the colon means the user's group will have perms
    [ -d /home/"$username"/.gnupg ] || mkdir /home/"$username"/.gnupg
    chown -R "$username": /home/"$username"/.gnupg
    find /home/"$username"/.gnupg -type f -exec chmod 600 {} \;
    find /home/"$username"/.gnupg -type d -exec chmod 700 {} \;

    #  Power Management

    action="Power Management" && display "subtitle" "$action"
    pacman_install acpi
    pacman_install powertop

    #  Audio System

    action="Audio System" && display "subtitle" "$action"
    for software in alsa-utils pipewire wireplumber pipewire-pulse \
                               pipewire-docs pamixer pulsemixer ffmpeg; do
        pacman_install $software
    done;
    # disable the pc speaker beep
    rmmod pcspkr >> "$logfile" 2>&1
    echo "blacklist pcspkr" >/etc/modprobe.d/nobeep.conf  >> "$logfile" 2>&1

    # Keyboard Shortcut Manager

    action="Keyboard Shortcut Manager" && display "subtitle" "$action"
    pacman_install sxhkd

    # Notifications

    action="Notification System" && display "subtitle" "$action"
    pacman_install libnotify
    pacman_install dunst

    # Bluetooth Devices

    action="Bluetooth System" && display "subtitle" "$action"
    for software in bluez bluez-utils blueman; do
        pacman_install $software
    done
    action="enabling bluetooth to launch at boot" && display "task" "$action"
    systemctl enable bluetooth.service  >> "$logfile" 2>&1 || error "error" "$action" "$?"

    # Command Line Utilities

    action="Command Line Utilities" && display "subtitle" "$action"
    for software in htop mc ncdu tmux fzf zip unzip atool wget detox \
                         lsof usbutils moreutils; do
        pacman_install "$software"
    done;

	for software in task-spooler speedtest-go gotop-bin rar; do
        aur_install "$software"
    done;

    # Help And Documentation

	action="Help and Documentation" && display "subtitle" "$action"
	pacman_install man
	pacman_install arch-wiki-docs
	pacman_install tealdeer
	aur_install cht.sh-git

    # Sync Services

    action="Sync Services" && display "subtitle" "$action"

    pacman_install syncthing
    systemctl enable syncthing@$username.service  >> "$logfile" 2>&1 || error "error" "$action" "$?"

    # Desktop Environment Utilities

    action="Desktop Environment Utilities" && display "subtitle" "$action"

	for software in brightnessctl xautolock network-manager-applet xclip \
                                  conky nitrogen qalculate-gtk; do
        pacman_install $software
    done;

    aur_install python-pulsectl
    aur_install caffeine-ng
	aur_install colorpicker

    # Theme and Cursor

    action="UI Theme" && display "subtitle" "$action"

    for software in picom lxappearance gnome-themes-extra gtk-engine-murrine; do
        pacman_install $software
    done;

    for software in vimix-icon-theme vimix-cursors vimix-gtk-themes \
                                     qt5ct adwaita-color-schemes; do
        aur_install $software
    done;

    # Browsers

    action="Browsers" && display "subtitle" "$action"
    pacman_install firefox
	## TESTING IF NEEDED aur_install librewolf-bin
    aur_install tor-browser-bin
    aur_install google-chrome

    # Install Printing

    action="Print System" && display "subtitle" "$action"
	pacman_install cups                        # the printing service
	pacman_install cups-pdf                    # allows printing to pdf
	pacman_install foomatic-db-engine          # generates printer drivers, queues, and jobs
	pacman_install foomatic-db-ppds            # printer driver descriptions
	pacman_install foomatic-db-nonfree-ppds    # non-free printer driver descriptions
	pacman_install gutenprint                  # printer driver engine for older computers
	pacman_install foomatic-db-gutenprint-ppds # gutenprint prebuilt ppd files

	action="enabling printing service to launch at boot" && display "task" "$action"
    (systemctl enable cups.service  >> "$logfile" 2>&1) || error "error" "$action" "$?"
}

### Developer Workstation
developer_workstation () {

    action="Developer Workstation" && display "title" "$action"

    action="Programming Languages and Utilities" && display "subtitle" "$action"
    # C
    pacman_install clang       # C/C++ compiler
    pacman_install cmake       # make system
    pacman_install gdb         # the GNU debugger
    pacman_install splint      # C programming static analysis
    pacman_install valgrind    # memory management utility

    # java
    pacman_install jdk-openjdk # Java Development Kit
    pacman_install openjdk-doc # ...and the documentation

    # Lisps
    pacman_install guile       # GNU Scheme
    pacman_install sbcl        # Steel Bank Common Lisp
    pacman_install racket      # Racket + SICP mit-scheme emulation

    # Rust
    pacman_install rust        # Rust programming language

    # Python
	pacman_install pyright     # Python language server
	pacman_install pyenv       # Python environment manager

    # Shell
    pacman_install shellcheck  # Shell script linter
    pacman_install shfmt       # Shell script formatter

    # Go
    pacman_install delve       # Go programming language debugger
    pacman_install go-tools    # Go language utilities
    pacman_install gopls       # Go language server
    pacman_install staticcheck # Go programming language linter

    # Typescript
	pacman_install jq          # JSON processor
	pacman_install typescript  # Typescript programming language
	pacman_install nodejs      # Node-js JavaScript runtime environment
	pacman_install npm         # Node-js package manager
	aur_install nvm            # Node-js version manager

    # HTML
    pacman_install tidy        # HTML formatter
    pacman_install prettier    # Multi-language formatter

    # General Utilities
    pacman_install meld             # Visual diff
    pacman_install ripgrep          # Fast grep utility
    aur_install the_silver_searcher # Another fast grep utility

    action="Programming Editors" && display "subtitle" "$action"
    pacman_install mg                        # mini emacs
    pacman_install neovim                    # mega vi
    pacman_install pycharm-community-edition # python ide
    pacman_install code                      # vscode oss version

    action="Emacs Dependencies" && display "subtitle" "$action"
    pacman_install emacs

    # supporting utilities used by my emacs configuration
	aur_install exercism-bin         # command line tool for exercism.io
    aur_install isync                # email sync
    aur_install mu                   # email indexer and utilities
    aur_install multimarkdown        # markdown conversion
    aur_install proselint            # grammar checker
    aur_install gist                 # command-line gist poster
    pacman_install aspell            # spell check system
    pacman_install aspell-en         # spell check english files
    pacman_install fd                # a faster find for dired/dirvish
    pacman_install ffmpegthumbnailer # video previews in dired/dirvish
    pacman_install imagemagick       # image previews for dired/dirvish
    pacman_install libgccjit         # native compilation for Emacs
    pacman_install mediainfo         # generating media info in dired/dirvish
    pacman_install mpv               # video viewer
    pacman_install mailutils         # Emacs' IMAP mail support backend
    pacman_install msmtp             # mail transport for Mu4e
    pacman_install msmtp-mta         # mail transport for Mu4e
    pacman_install python-lsp-server # python language support
    pacman_install rlwrap            # adds readline support to programs (SBCL-related)
    pacman_install sdcv              # stardict dictionary system
    pacman_install yt-dlp            # video download

    action="setting up emacs configuration files" && display "task" "$action"
    (sudo -u "$username" git clone --recurse-submodules $dotemacs_repo /home/$username/.emacs.d  >> \
          "$logfile" 2>&1) || error "error" "$action" "$?"

    action="Android Utilities" && display "subtitle" "$action"
    pacman_install android-file-transfer
    pacman_install android-tools

    action="DevOps Utilities" && display "subtitle" "$action"

    action="installing devops virtualization and automation tools" && display "task" "$action"
    pacman_install vagrant
    pacman_install ansible

    # distrobox related
    pacman_install podman
    pacman_install distrobox
    aur_install boxbuddy
    aur_install ptyxis

    # boxes
    pacman_install gnome-boxes

    # virtualbox related
	# ensure headers exist before installing virtualbox*dkms
	pacman_install linux-headers
	pacman_install linux-lts-headers

	pacman_install virtualbox
	pacman_install virtualbox-guest-iso
	pacman_install virtualbox-host-dkms

    # docker
	action="adding user to vboxusers group" && display "task" "$action"
	(gpasswd -a $username vboxusers >> "$logfile" 2>&1)  || error "error" "$action" "$?"
	pacman_install docker
	pacman_install docker-compose
	action="adding user to docker group" && display "task" "$action"
	(gpasswd -a $username docker >> "$logfile" 2>&1)  || error "error" "$action" "$?"
	action="enabling docker service to launch on boot" && display "task" "$action"
	systemctl enable docker.service >> "$logfile" 2>&1  || error "error" "$action" "$?"
}

### Supplemental Software
supplemental_software() {

    display "title" "Supplemental Software"

    # pacman installs
    pacman_install devtools                          # tools for arch linux package maintenance
    pacman_install arandr                            # xrandr gui for monitor settings
    pacman_install arch-install-scripts              # for making arch installers
    pacman_install archinstall                       # the archinstall python program
    pacman_install aria2                             # fast downloader
    pacman_install bc                                # arbitrary precision calculator
    pacman_install calibre                           # ebook manager/viewer
    pacman_install dash                              # posix compliant /bin/sh
    pacman_install dfc                               # better display of available space on mounted filesystems
    pacman_install docx2txt                          # recovers text from docx files
    pacman_install entr                              # run arbitrary commands when files change
    pacman_install faac                              # open source mpeg 3 and aac encoder
    pacman_install faad2                             # processes an aac stream
    pacman_install figlet                            # words into ascii art
    pacman_install filezilla                         # ftp gui
    pacman_install gparted                           # disk partition utility
    pacman_install gst-plugin-pipewire               # gstreamer audio plugin for pipewire
    pacman_install gst-plugins-base                  # gstreamer base audio plugins
    pacman_install gst-plugins-good                  # gstreamer extra audio plugins
    pacman_install gstreamer                         # pipeline based multimedia framework
    pacman_install gucharmap                         # gui display of character maps
    pacman_install gzip                              # compression tool
    pacman_install handbrake                         # video transcoder
    pacman_install ledger                            # CLI accounting software
    pacman_install libconfig                         # library for processing structured config files
    pacman_install libmad                            # mpeg audio decoder
    pacman_install libmpeg2                          # library for decoding mpeg video streams
    pacman_install maim                              # screenshot utility
    pacman_install mediainfo                         # technical and tag information about media files
    pacman_install mosh                              # alt SSH terminal with roaming and responsiveness support
    pacman_install mpc                               # command line interface to mpd
    pacman_install mpd                               # the music player daemon
    pacman_install ncmpcpp                           # and mpd client to play music
    pacman_install neofetch                          # cli system information tool
    pacman_install obs-studio                        # desktop recording software
    pacman_install obsidian                          # personal knowledgebase
    pacman_install odt2txt                           # converts from open document to text
    pacman_install p7zip                             # p7zip compression tool
    pacman_install pandoc                            # universal document converter
    pacman_install perl-image-exiftool               # reads/writes exif info for raw photo files
    pacman_install poppler-glib                      # poppler-glib document viewer library
    pacman_install pv                                # monitor progress of data through pipeline
    pacman_install ranger                            # terminal file manager
    pacman_install rclone                            # syncs files from gdrive, s3, dropbox, etc.
    pacman_install signal-desktop                    # secure messenger
    pacman_install smartmontools                     # monitors hard drives
    pacman_install texlive-meta                      # latex
    pacman_install thunderbird                       # email, calendar, rss feeds
    pacman_install transmission-cli                  # bittorrent client
    pacman_install transmission-remote-gtk           # bittorrent client
    pacman_install unclutter                         # hides mouse cursor when not being used
    pacman_install w3m                               # text based browser
    pacman_install wavpack                           # audio compression format
    pacman_install webkit2gtk                        # web content engine for GTK
    pacman_install xcb-util-cursor                   # calibre dependency (calibre installed manually)
    pacman_install xdotool                           # command line xorg automation tool
    pacman_install xz                                # general purpose data compression tool
    pacman_install zathura                           # document viewer
    pacman_install zathura-cb                        # zathura plugin for comics
    pacman_install zathura-djvu                      # zathura plugin for djvu books
    pacman_install zathura-pdf-mupdf                 # zathura plugin for pdf
    pacman_install zlib                              # compression library

    # aur installs
    aur_install topgrade                             # upgrade everything utility
    aur_install dtrx                                 # extraction tool
    aur_install figlet-fonts                         # fonts for figlet
    aur_install hfsprogs                             # file system tools for Mac OS
    aur_install mcomix                               # image viewer for comic books
    aur_install nsxiv                                # image viewer
    aur_install shell-gpt                            # gpt in your terminal
    aur_install tageditor                            # metadata editor for mkv, webm and related video files
    aur_install tidal-dl                             # tidal-dl:tidal as yt-dlp:youtube
    aur_install ueberzug                             # allows for displaying images in terminals
    aur_install tremc                                # curses interface for transmission
    aur_install snore-git                            # sleep with feedback
    aur_install zsh-fast-syntax-highlighting-git     # Optimized and extended zsh-syntax-highlighting
}

### Boot-Related
silent_boot() {

    action="Silent Boot" && display "title" "$action"

    action="removing distro and date/time from initial screen" && display "task" "$action"
    (cat /dev/null >/etc/issue)  || error "error" "$action" "$?"

    action="preventing kernel messages on the console" && display "task" "$action"
    (echo "kernel.printk = 3 3 3 3" >/etc/sysctl.d/20-quiet-printk.conf)  || \
        error "error" "$action" "$?"

    action="delegating fsck messages from udev to systemd" && display "task" "$action"
    sed -i "s/.*HOOKS=(base udev autodetect keyboard keymap modconf block filesystems fsck).*/HOOKS=(base systemd autodetect keyboard keymap modconf block filesystems fsck)/" /etc/mkinitcpio.conf  || error "error" "running sed on mkinitcpio.conf to hide fsck messages" "$?"
    mkinitcpio -P  >> "$logfile" 2>&1  || error "error" "running mkinitcpio -P to silence fsck messages" "$?"

    action="instructing systemd to check filesystems" && display "task" "$action"
    servicefile=/usr/lib/systemd/system/systemd-fsck-root.service
    [ -f $servicefile ] && echo "StandardOutput=null" >>$servicefile && \
        echo "StandardError=journal+console" >>$servicefile

    servicefile=/usr/lib/systemd/system/systemd-fsck@.service
    [ -f $servicefile ] && echo "StandardOutput=null" >>$servicefile && \
        echo "StandardError=journal+console" >>$servicefile

    action="removing hostname from login prompt" && display "task" "$action"
    sed -i "s/--noclear/--nohostname --noclear/g" /usr/lib/systemd/system/getty@.service  \
        || error "error" "$action" "$?"
    sed -i "s/--noclear/--nohostname --noclear/g" /usr/lib/systemd/system/container-getty@.service  \
        || error "error" "$action" "$?"
    sed -i "s/--noclear/--nohostname --noclear/g" /usr/lib/systemd/system/console-getty.service  \
        || error "error" "$action" "$?"

    action="silencing the unneeded and chatty watchdog module" && display "task" "$action"
    echo "blacklist iTCO_wdt" >/etc/modprobe.d/nowatchdog.conf  || error "error" "$action" "$?"

    # SYSTEMD BOOT: eliminate timeout and silence boot text
    if [ -f /boot/loader/loader.conf ]; then
        action="eliminating timeout and silencing boot test on systemd boot" && display "task" "$action"
        echo "timeout=0" >/boot/loader/loader.conf

        # the file in this location was named based on the time of the install, so we must use find to identify it.
        kernelfile=$(find /boot/loader/entries/ -name "*.conf")
        # hush boot output via kernel parameters
        sed -i "/.*options root=PARTUUID.*/ s/$/quiet rd.systemd.show_status=auto rd.udev.log_level=2 nvme.noacpi=1 mem_sleep_default=deep nowatchdog/" "$kernelfile"
    fi

    # GRUB: reset timeouts and adjust log levels
    if [ -f /etc/default/grub ]; then
        action="resetting timeouts and adjusting log levels on grub boot" && display "task" "$action"
        sed -i "s/.*GRUB_TIMEOUT=.*/GRUB_TIMEOUT=0/g" /etc/default/grub
        sed -i "s/.*GRUB_DEFAULT=.*/GRUB_DEFAULT=0/g" /etc/default/grub
        sed -i "s/.*GRUB_RECORDFAIL_TIMEOUT=.*/GRUB_RECORDFAIL_TIMEOUT=$GRUB_TIMEOUT/g" /etc/default/grub
        sed -i "s/.*GRUB_CMDLINE_LINUX_DEFAULT=.*/GRUB_CMDLINE_LINUX_DEFAULT=\"rw quiet loglevel=2 rd.systemd.show_status=auto rd.udev.log_level=2 nvme.noacpi=1 mem_sleep_default=deep nowatchdog\"/g" /etc/default/grub
        grub-mkconfig -o /boot/grub/grub.cfg  >> "$logfile" 2>&1  || error "error" "" "$?"
    fi
}

### Outro
outro() {

    action="Cleanup" && display "title" "$action"
    action="forcing user password change on first login" && display "task" "$action"
    chage -d 0 "$username"  >> "$logfile" 2>&1 || error "error" "$action" "$?"

    display "subtitle" "Statistics"
    action="identifying newly installed packages" && display "task" "$action"
    pacman -Q > "$packages_after"  || error "error" "$action" "$?"
    (comm -13 --nocheck-order "$packages_before" "$packages_after" > "$archsetup_packages")  || \
        error "error" "$action" "$?"

    action="comparing timestamps" && display "task" "$action"
    ENDTIME=$(date +%s)
    totalsecs=$(($ENDTIME - $STARTTIME))
    mins=$(($totalsecs / 60))
    secs=$(($totalsecs % 60))

    new_packages=$(cat $archsetup_packages | wc -l)

    printf "\n"
    printf "Completion time    : %s\n" "$(date +'%D %T')"  | tee -a "$logfile"
    printf "Elapsed time       : %s minutes, %s seconds\n" $mins $secs | tee -a "$logfile"
    printf "Errors encountered : %s\n" $errors_encountered | tee -a "$logfile"
    printf "Log file location  : %s\n" "$logfile"
    printf "Packages installed : %s\n" "$new_packages"
    printf "\n"
    printf "Please reboot before working with your new workstation.\n\n"
}

### Installation Steps
intro                 # take start stats

prerequisites         # install software required to install software
create_user           # create user in wheel with :nopasswd sudo
user_customizations   # dotfiles
aur_installer         # install yay (comment out if using zfsarch install first)
essential_services    # ssh, firewall, printing, etc
xorg                  # display manager
dwm                   # window manager
desktop_environment   # commonly used applications
developer_workstation # development tools and utilities
supplemental_software # everything else
# silent_boot           # make booting a bit less noisy

outro                 # take end stats; show summary

exit 0