Quickly setup zsh powered by antigen on fresh Debian servers

zsh-antigen-debian.sh

#!/bin/bash

# Quickly setup Zsh powered by antigen on fresh Debian servers
# Usage: bash -c "$(curl -fsSL https://gist.githubusercontent.com/soifou/c99be4373f6ffe3b4ff7/raw/COMMIT_ID/zsh-antigen-debian.sh)"


if [[ $(which zsh | wc -m) == 0 ]]; then
    echo "Zsh is not installed... installing"
    sudo apt-get install -y zsh
fi
if [[ $(which curl | wc -m) == 0 ]]; then
    echo "Curl is not installed... installing"
    sudo apt-get install -y curl
fi

if [[ ! -d $HOME/.antigen ]]; then
    echo "Clone antigen repository..."
    mkdir $HOME/.antigen
    curl -L git.io/antigen > $HOME/.antigen/antigen.zsh
fi

if [[ -f $HOME/.zshrc ]]; then
    echo "Found existing zshrc... backup"
    mv $HOME/.zshrc $HOME/.zshrc.dotbackup
fi

echo "Configuring zshrc..."
cat > "$HOME/.zshrc" <<EOF
LC_CTYPE=en_US.UTF-8
LC_ALL=en_US.UTF-8
source $HOME/.antigen/antigen.zsh
antigen use oh-my-zsh
antigen bundle debian
antigen bundle git
antigen bundle command-not-found
antigen bundle zsh-users/zsh-syntax-highlighting
antigen bundle zsh-users/zsh-history-substring-search
antigen theme bureau
antigen apply
bindkey '^[[A' history-substring-search-up
bindkey '^[[B' history-substring-search-down
EOF

CURRENT_SHELL=$(expr "$SHELL" : '.*/\(.*\)')
if [ "$CURRENT_SHELL" != "zsh" ]; then
    echo "\033[0;34mTime to change your default shell to zsh!\033[0m"
    sudo chsh --shell=$(grep /zsh$ /etc/shells | tail -1) $USER
fi
unset CURRENT_SHELL

echo "Reload shell..."
env zsh
source $HOME/.zshrc