set -eu

ChangeOrAppendParameter()
{
    awk -i inplace -v kvpair="$2 $3" '{if ($0~/'"^$2"'/) {print kvpair;found=1} else {print $0}} ENDFILE {if (!found) {print kvpair}}' $1
}

CreateDirIfNotExistForFile()
{
    if [ ! -d $(dirname $1) ]; then mkdir -p $1
    fi
}

BackupFile()
{
    local backupFilePath=/etc/backup.custom$1
    if [ ! -f $backupFilePath ]; then
        CreateDirIfNotExistForFile $backupFilePath
        cp $1 $backupFilePath
    fi
}

SetUpTerminal()
{
    BackupFile /etc/inputrc
    ChangeOrAppendParameter /etc/inputrc 'set completion-ignore-case' on
    ChangeOrAppendParameter /etc/inputrc '"\\C-h":' backward-kill-word
}

SetUpNetwork()
{
    BackupFile /etc/hosts
    ChangeOrAppendParameter /etc/hosts '192.168.1.1' router

    local resolveCustomFilePath=/etc/systemd/resolved.conf.d/resolve.custom.conf
    CreateDirIfNotExistForFile $resolveCustomFilePath
    echo -e "# your settings"|sudo tee $resolveCustomFilePath>/dev/null
    sudo systemctl restart systemd-resolved
    sudo systemctl restart NetworkManager
}

SetUpJournal()
{
    local resolveCustomFilePath=/etc/systemd/journald.conf.d/journal.custom.conf
    CreateDirIfNotExistForFile $resolveCustomFilePath
    echo -e "[Journal]\nStorage=volatile\nRuntimeMaxUse=128M\nForwardToSyslog=no"|sudo tee $resolveCustomFilePath>/dev/null
    sudo systemctl restart systemd-journald
}

SetUpGnome()
{
    gsettings set org.gnome.desktop.input-sources sources "[('xkb', 'us'), ('xkb', 'ru+typewriter')]"
    gsettings set org.gnome.desktop.input-sources per-window true
    gsettings set org.gnome.desktop.wm.keybindings show-desktop "['<Super>d']"
    gsettings set org.gnome.desktop.session idle-delay 240
    # etc
}