install.sh

#!/bin/sh
set -e

# Test command existence (POSIX compatible)
command_exists() {
	command -v "$@" >/dev/null 2>&1
}

main() {
	# Use colors, but only if connected to a terminal, and that terminal
	# supports them.
	if command_exists tput; then
		ncolors=$(tput colors)
	fi

	if [ -t 1 ] && [ -n "$ncolors" ] && [ "$ncolors" -ge 8 ]; then
		RED="$(tput setaf 1)"
		GREEN="$(tput setaf 2)"
		YELLOW="$(tput setaf 3)"
		BLUE="$(tput setaf 4)"
		BOLD="$(tput bold)"
		NORMAL="$(tput sgr0)"
	else
		RED=""
		GREEN=""
		YELLOW=""
		BLUE=""
		BOLD=""
		NORMAL=""
	fi

	if ! command_exists zsh; then
		printf "${YELLOW}Zsh is not installed!${NORMAL} Please install zsh first!\n"
		exit 1
	fi

	if [ ! -n "$ZSH" ]; then
		ZSH=~/.oh-my-zsh
	fi

	if [ -d "$ZSH" ]; then
		printf "${YELLOW}You already have Oh My Zsh installed.${NORMAL}\n"
		printf "You'll need to remove $ZSH if you want to re-install.\n"
		exit 1
	fi

	# Prevent the cloned repository from having insecure permissions. Failing to do
	# so causes compinit() calls to fail with "command not found: compdef" errors
	# for users with insecure umasks (e.g., "002", allowing group writability). Note
	# that this will be ignored under Cygwin by default, as Windows ACLs take
	# precedence over umasks except for filesystems mounted with option "noacl".
	umask g-w,o-w

	printf "${BLUE}Cloning Oh My Zsh...${NORMAL}\n"
	command_exists git || {
		echo "Error: git is not installed"
		exit 1
	}
	# The Windows (MSYS) Git is not compatible with normal use on cygwin
	if [ "$OSTYPE" = cygwin ]; then
		if git --version | grep msysgit > /dev/null; then
			echo "Error: Windows/MSYS Git is not supported on Cygwin"
			echo "Error: Make sure the Cygwin git package is installed and is first on the path"
			exit 1
		fi
	fi
	env git clone --depth=1 https://github.com/robbyrussell/oh-my-zsh.git "$ZSH" || {
		printf "Error: git clone of oh-my-zsh repo failed\n"
		exit 1
	}

	printf "${BLUE}Looking for an existing zsh config...${NORMAL}\n"
	if [ -f ~/.zshrc ] || [ -h ~/.zshrc ]; then
		printf "${YELLOW}Found ~/.zshrc.${NORMAL} ${GREEN}Backing up to ~/.zshrc.pre-oh-my-zsh${NORMAL}\n";
		mv ~/.zshrc ~/.zshrc.pre-oh-my-zsh;
	fi

	printf "${BLUE}Using the Oh My Zsh template file and adding it to ~/.zshrc${NORMAL}\n"
	cp "$ZSH/templates/zshrc.zsh-template" ~/.zshrc
	sed "/^export ZSH=/ c\\
export ZSH=\"$ZSH\"
" ~/.zshrc > ~/.zshrc-omztemp
	mv -f ~/.zshrc-omztemp ~/.zshrc

	# If this user's login shell is not already "zsh", attempt to switch.
	TEST_CURRENT_SHELL=$(basename "$SHELL")
	if [ "$TEST_CURRENT_SHELL" != "zsh" ]; then
		# If this platform provides a "chsh" command (not Cygwin), do it, man!
		if command_exists chsh; then
			printf "${BLUE}Time to change your default shell to zsh!${NORMAL}\n"
			chsh -s $(grep /zsh$ /etc/shells | tail -1)
		# Else, suggest the user do so manually.
		else
			printf "I can't change your shell automatically because this system does not have chsh.\n"
			printf "${BLUE}Please manually change your default shell to zsh!${NORMAL}\n"
		fi
	fi

	printf "${GREEN}"
	echo '         __                                     __   '
	echo '  ____  / /_     ____ ___  __  __   ____  _____/ /_  '
	echo ' / __ \/ __ \   / __ `__ \/ / / /  /_  / / ___/ __ \ '
	echo '/ /_/ / / / /  / / / / / / /_/ /    / /_(__  ) / / / '
	echo '\____/_/ /_/  /_/ /_/ /_/\__, /    /___/____/_/ /_/  '
	echo '                        /____/                       ....is now installed!'
	echo ''
	echo ''
	echo 'Please look over the ~/.zshrc file to select plugins, themes, and options.'
	echo ''
	echo 'p.s. Follow us at https://twitter.com/ohmyzsh'
	echo ''
	echo 'p.p.s. Get stickers, shirts, and coffee mugs at https://shop.planetargon.com/collections/oh-my-zsh'
	echo ''
	printf "${NORMAL}"
	env zsh -l
}

main