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#!/bin/sh

# Check if programs are installed on the system.
# Format for entries `program,alternative_program:output_message`,
# `alternative_program` and `message` are optional.
check() {
    fail=0
    [ "${1}" = "-l" ] && { ISLIB=1; shift;} || ISLIB=0
    for entry in "${@}"; do
        missing=0
        program_part=${entry%%:*}
        program=${program_part%%,*}
        alt_program=${program_part#*,}
        msg=${entry#*:}

        [ "${msg}" = "${entry}" ] && msg="${program} is missing"

        if [ "${ISLIB}" -eq 1 ]; then
            pkg-config --exists "${program}" || missing=1
        elif ! command -v "${program}" > /dev/null 2>&1 &&
                ! command -v "${alt_program}" > /dev/null 2>&1; then
        missing=1
        fi

        [ "${missing}" -eq 1 ] && { echo "$msg" >&2; fail=1; }
    done
    return "${fail}"
}

retval=0

# Optional Dependencies, skip QEMU and lualatex check
[ "${1}" = "--optional" ] && check \
     cmus                                    \
     latex,pdflatex:"latex is missing"       \
     neomutt,mutt                            \
     pamus                                   \
     pandoc                                  \
     shellcheck                              \
     ssh                                     \
     trans:"translate shell is missing"      \
     abook                                   \
     acpi                                    \
     cmus                                    \
     dash                                    \
     docker                                  \
     ffmpeg                                  \
     less                                    \
     pass                                    \
     python3                                 \
     rsync                                   \
     sudo                                    \
     tldr:"a tldr implementation is missing" \
     unclutter:"unclutter-xfixes is missing" \
     yt-dlp

# Programs
check \
    Xorg                               \
    dunst                              \
    fzf                                \
    git                                \
    lf                                 \
    mpv                                \
    notify-send:"libnotify is missing" \
    nsxiv,sxiv                         \
    nvim,vim                           \
    picom                              \
    qutebrowser                        \
    scrot                              \
    setxkbmap                          \
    startx:"xorg-xinit is missing"     \
    xclip                              \
    zathura                            \
    zsh,bash

# Script dependencies
check \
    brightnessctl                 \
    pulseaudio                    \
    xgamma                        \
    xinput                        \
    xset                          \
    xwallpaper

# Build dependencies
check \
    cc:"c compiler is missing"        \
    curl                              \
    fc-cache:"fontconfig is missing" \
    ld:"linker is missing"            \
    make                              \
    tic:"ncurses is missing"          \
    tar || retval=1

# Libraries
if check pkg-config; then
    check -l \
        x11:"libX11 is missing"  \
        xft:"libXft is missing " \
        xinerama:"libXinerama is missing" || retval=1
else
    echo "Warning: Skipping library check since 'pkg-config' is missing" >&2
    retval=1
fi

exit "${retval}"