unix_shell_plugins_setup.sh

#!/usr/bin/env zsh

## global variables
## save user's current working directory
export last_working_directory="$PWD"
export ZSH="$HOME/.oh-my-zsh/"
export OSH="$HOME/.oh-my-bash/"
export OMF_PATH="$HOME/.local/share/omf/"
export OMF_CONFIG="$HOME/.config/omf/"

function main() {
	## same as main() function in C language

	## go to user home directory for default setup.
	cd "$HOME"

	## write global variables to zshrc
	
	
      

	if [ -e "$(which git)" ]; then
		## greetings
		printf " \n Welcome. This script could help you with setting up some awesome plugins for bash, zsh, and fish shell. \n  For more information please visit homepage. \n \n https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup \n \n"
	else
		printf " \n We could not find git executable file.  \n Please install git by package manager i.e. Homebrew. \n"
		exit 1
	fi

	
	## install oh-my-zsh firstly before other plugins. ohmyzsh overwrites zshrc. start
	# ohmyzsh setup. start.
	printf " \n ohmyzsh/ohmyzsh is a delightful community-driven framework for managing your zsh configuration.  \n Includes 300+ optional plugins,140+ themes. \n\n Would you like to install ohmyzsh/ohmyzsh ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		ohmyzsh_setup
	else
		#echo No
		printf " \n Skipped ohmyzsh/ohmyzsh installation. \n"
	fi
	# ohmyzsh setup. ENd.
	
	## zsh-plugins setup. start.
	printf " \n zsh plugins make shell look pretty and help you work easier. \n \n Would you like to install zsh plugins ? [y/n] \n"
	read answer
	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		zsh-plugins-setup
	else
		#echo No
		printf " \n Skipped zsh plugins installation. \n"
	fi
	## zsh-plugins setup. End.

	# oh-my-bash setup . Start.
	printf " \n ohmybash/oh-my-bash is a delightful community-driven framework for managing your bash configuration. \n \n Would you like to install ohmybash/oh-my-bash ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		oh-my-bash-setup
	else
		#echo No
		printf " \n Skipped ohmybash/oh-my-bash installation. \n"
	fi
	## oh-my-bash setup. End.

	## ble.sh setup. start.
	printf " \n akinomyoga/ble.sh is a full-featured line editor.  \n Syntax highlighting, auto suggestions, vim modes, etc.  \n are available in Bash interactive sessions. \n \n Would you like to install akinomyoga/ble.sh ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		ble-sh-setup
	else
		#echo No
		printf " \n Skipped akinomyoga/ble.sh installation. \n"
	fi
	## ble.sh setup. End.
	

	## oh-my-fish setup. start.
	printf " \n oh-my-fish/oh-my-fish provides core infrastructure to allow you to install packages \n which extend or modify the look of your shell. \n  It's fast, extensible and easy to use. \n \n Would you like to install oh-my-fish/oh-my-fish ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		oh-my-fish-setup
	else
		#echo No
		printf " \n Skipped oh-my-fish/oh-my-fish installation. \n"
	fi
	# oh-my-fish setup. End.

	## fish plugins setup. start.
	printf " \n fish plugins extend or modify the look of your shell. \n \n Would you like to install fish plugins? [y/n] \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		fish_plugins_setup
	else
		#echo No
		printf " \n Skipped fish shell plugins installation. \n"
	fi
	# fish plugins setup. End.

	## bashhub.com setup. start.
	printf " \n rcaloras/bashhub-client is Bash history in the cloud. Indexed and searchable. \n If you prefer open source self-hosted private server, here we go. \n \n https://github.com/nicksherron/bashhub-server \n \n Would you like to install rcaloras/bashhub-client ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		bashhub-client-setup
	else
		#echo No
		printf " \n Skipped rcaloras/bashhub-client installation. \n"
	fi
	## bashhub.com setup. End.

	## fzf setup. start.
	printf " \n junegunn/fzf is an interactive Unix filter for command-line that can be used with \n any list; files, command history, processes, hostnames, bookmarks, git commits, etc. \n\n Would you like to install junegunn/fzf ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		fzf-setup
	else
		#echo No
		printf " \n Skipped junegunn/fzf installation. \n"
	fi
	# fzf setup. End.

	## thefuck setup. start.
	printf " \n nvbn/thefuck is a magnificent app which corrects your previous console command. \n \n Would you like to install nvbn/thefuck ? [y/n] \n"
	read answer
	if [ "$answer" != "${answer#[Yy]}" ]; then
		thefuck_setup
	else
		printf " \n Skipped thefuck setup. \n"
	fi
	## thefuck setup. End.


	## rupa/z setup. start.
	printf "rupa/z tracks your most used directories, based on 'frecency'. \n NOTE: rupa_z should be at the end of .zshrc. \n \n Would you like to install rupa/z for bash and zsh ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		rupa_z_setup
	else
		#echo No
		printf " \n Skipped rupa/z for bash and zsh installation. \n"
	fi
	## rupa/z setup. End.


	## clean up before exiting this script.
	exiting_cleanup
}

function rupa_z_setup() {
	printf " \n Setting up rupa/z for bash and zsh \n"
	git clone --depth=1 https://github.com/rupa/z.git ~/Git/z/
	printf " \n \n source ~/Git/z/z.sh \n \n" >>~/.zshrc
	## save z.sh to another file.
	# cat ~/zsh-snap/z/z.sh >>~/.zshrc
	# printf " \n \n" >>~/.zshrc
	printf " \n \n source ~/Git/z/z.sh \n \n" >>~/.bashrc
	# cat ~/zsh-snap/z/z.sh >>~/.bashrc
	# printf " \n \n" >>~/.bashrc
	printf " \n rupa/z for bash and zsh was installed. \n"

}

function fish_plugins_setup() {
	## fisher_installation start
	printf " \n Setting up jorgebucaran/fisher . \n"
	## if [ "$(which fish)"=1 ]
	## prerious if statement failed.
	if [ -e "$(which fish)" ]; then
		## fisher official installer start
		curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/fish_plugins/fisher_installation.fish
		fish ./fisher_installation.fish
		## call rm in script itself
		## rm ./fisher
		## rm ./fisher_installation.fish
		printf " \n jorgebucaran/fisher was installed. \n"
	else
		printf " \n We could not find fish shell executable file.  \n Please install fish shell by package manager i.e. Homebrew. \n"
	fi

	## fisher_installation end

	## jorgebucaran/autopair.fish setup start
	printf " \n jorgebucaran/autopair.fish automatically insert, erase, and skip matching pairs(brackets) as you type in fish. \n \n Would you like to install jorgebucaran/autopair.fish ? [y/n] \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		autopair_fish_setup
	else
		#echo No
		printf " \n Skipped jorgebucaran/autopair.fish installation. \n"

	fi
	## jorgebucaran/autopair.fish setup end

	## jethrokuan/z setup start
	printf " \n jethrokuan/z tracks the directories you visit. \n With a combination of frequency and recency, \n it enables you to jump to the directory in mind. \n \n Would you like to install jethrokuan/z for fish ? [y/n] \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		jethrokuan_z_setup
	else
		#echo No
		printf " \n Skipped jethrokuan/z for fish installation. \n"

	fi

	## jethrokuan/z setup end
}

function jethrokuan_z_setup() {
	printf " \n Setting up jethrokuan/z \n"
	curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/fish_plugins/z_installation.fish
	fish ./z_installation.fish
	rm ./z_installation.fish
	printf " \n jethrokuan/z was installed. \n"
}

function autopair_fish_setup() {
	printf " \n Setting up jorgebucaran/autopair.fish \n"
	curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/fish_plugins/autopair_installation.fish
	fish ./autopair_installation.fish
	rm ./autopair_installation.fish
	printf " \n jorgebucaran/autopair.fish was installed. \n"
}

function thefuck_setup() {
	if [ -e "$(which pip)" ]; then
		printf " \n Setting up nvbn/thefuck . \n"
		pip install thefuck
		printf " \n nvbn/thefuck was installed. \n"
	else
		printf " \n We could not find pip executable file.  \n Please install pip by package manager i.e. Homebrew. \n"
	fi
}

function bashhub-client-setup() {
	if [ -e "$(which python)" ]; then
		printf " \n Setting up rcaloras/bashhub-client . \n"
		curl -ksSLO https://bashhub.com/setup
		printf " \n exit " >>./setup
		zsh ./setup
		rm ./setup
		printf " \n rcaloras/bashhub-client was installed. \n"
	else
		printf " \n We could not find python executable file.  \n Please install python by package manager i.e. Homebrew. \n"
	fi
}

function fzf-ripgrep-bat-vscode-integration-setup() {
	if [ -e "$(which rg)" ]; then
		if [ -e "$(which awk)" ]; then
			if [ -e "$(which bat)" ]; then
				printf " \n NOTE: Press Control+O to open file in VSCode on previewing screen. \n"
				curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/plugins/fif.sh
				printf " \n \n" >>~/.zshrc
				cat fif.sh >>~/.zshrc
				printf " \n \n" >>~/.zshrc
				printf " \n \n" >>~/.bashrc
				cat fif.sh >>~/.bashrc
				printf " \n \n" >>~/.bashrc
				rm ./fif.sh
				printf " \n fzf-ripgrep-bat-vscode-integration was installed. \n"
			else
				printf " \n We could not find bat ( sharkdp/bat ) executable file.  \n Please install bat by package manager i.e. Homebrew. \n"
			fi
		else
			printf " \n We could not find awk ( GNU awk ) executable file.  \n Please install awk by package manager i.e. Homebrew. \n"
		fi
	else
		printf " \n We could not find ripgrep ( BurntSushi/ripgrep ) executable file.  \n Please install ripgrep by package manager i.e. Homebrew. \n"
	fi
}

function fzf-setup() {
	printf "\n Setting up junegunn/fzf . \n"
	## fzf official installer
	if [ -e "$(which unzip)" ]; then
		git clone --depth 1 https://github.com/junegunn/fzf.git ~/.fzf
		cd ~/.fzf
		git pull
		cp ./install ./fzf_install
		printf " \n exit " >>./fzf_install
		bash ~/.fzf/fzf_install
                # zsh ~/.fzf/fzf_install
		rm ./fzf_install
		printf " \n junegunn/fzf was installed. \n"
		## install fzf before installing the integration
		printf " \n This plugin helps you preview colored search result and open that file in Visual Studio Code . \n\n Would you like to install fzf-ripgrep-bat-vscode-integration ? [y/n]  \n"
		read answer
		if [ "$answer" != "${answer#[Yy]}" ]; then
			#echo Yes
			fzf-ripgrep-bat-vscode-integration-setup
		else
			printf " \n Skipped fzf-ripgrep-bat-vscode-integration installation. \n"

		fi
	else
		printf " \n We could not find unzip executable file.  \n Please install unzip by package manager i.e. Homebrew. \n"
	fi
}

function oh-my-fish-setup() {
	printf "\n Setting up oh-my-fish/oh-my-fish . \n"
	## oh-my-fish official installer start
	if [ -e "$(which fish)" ]; then
		printf " \n Please press Y to install over existing installation. \n"
		# curl -ksSLO https://raw.githubusercontent.com/oh-my-fish/oh-my-fish/master/bin/install
		## make sure fish exit and go back to zsh shell after installing oh-my-fish
		# printf " \n exit" >>./install
		curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/fish_plugins/install
		fish ./install
		rm ./install
		printf " \n oh-my-fish/oh-my-fish was installed. \n"
	else
		printf " \n We could not find fish shell executable file.  \n Please install fish shell by package manager i.e. Homebrew. \n"
	fi
	## oh-my-fish official installer . end.

	## random_omf_theme .start.
	printf " \n Would you like to enable random theme for oh-my-fish ? [y/n] \n"
	read answer
	if [ "$answer" != "${answer#[Yy]}" ]; then
		git clone --depth=1 https://github.com/MilkyMAISHIRANUI/random_omf_theme "$OMF_PATH/themes/random_omf_theme"
		echo "random_omf_theme" > "$OMF_CONFIG/theme"
		mv -f ~/.config/fish/functions/fish_prompt.fish  ~/.config/fish/functions/fish_prompt.fish.old
		printf " \n random themes of oh-my-fish are enabled. \n"
	else
		printf " \n The default theme of oh-my-fish is enabled. \n"
	fi
	## random_omf_theme . End.
}

function ble-sh-setup() {
	printf " \n Setting up akinomyoga/ble.sh . \n"
	## detect gnu awk make
	if [ -e "$(which awk)" ]; then
		if [ -e "$(which make)" ]; then
			printf " \n NOTE: Please visit software project homepage for installation guide.  \n https://github.com/akinomyoga/ble.sh \n"
			## ble.sh official installer
			git clone --recursive --depth=1 https://github.com/akinomyoga/ble.sh.git
			make -C ble.sh install PREFIX=~/.local
			echo 'source ~/.local/share/blesh/ble.sh' >>~/.bashrc
			## ble.sh official installer uses echo command. printf is better.
			## curl -ksSLOL https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/bash_plugins/ble.sh_bashrc_default
			## printf " \n \n" >> ~/.bashrc
			## cat ble.sh_bashrc_default >> ~/.bashrc
			## printf " \n \n" >> ~/.bashrc
			## rm ./ble.sh_bashrc_default
			printf " \n akinomyoga/ble.sh was installed. \n"
		else
			printf " \n We could not find make ( GNU make aka gmake ) executable file.  \n Please install make by package manager i.e. Homebrew. \n"
		fi
	else
		printf " \n We could not find awk ( GNU awk ) executable file.  \n Please install awk by package manager i.e. Homebrew. \n"
	fi
}


function oh-my-bash-setup(){
	printf " \n Setting up ohmybash/oh-my-bash . \n"
	curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/bash_plugins/install.sh
	bash ./install.sh
	rm ./install.sh
	printf " \n ohmybash/oh-my-bash was installed. \n"
	printf " \n Would you like to enable random theme for oh-my-bash ? [y/n] \n"
	read answer
	if [ "$answer" != "${answer#[Yy]}" ]; then
		if [ -e "$(which sed)" ]; then
			## perl command output nothing
			## perl -pe 's/OSH_THEME=\K\d+/random/' ~/.bashrc > ~/.bashrc
			## theme font is default theme of oh-my-bash
			mv -f ~/.bashrc ~/.bashrc.old
			sed '/^OSH_THEME/s/=.*$/=\"random\"/g' ~/.bashrc.old >~/.bashrc
		else
			printf " \n We could not find sed executable file.  \n Please install sed by package manager i.e. Homebrew. \n"
		fi
	else
		printf " \n The default theme of oh-my-bash is enabled. \n"
	fi
}

function oh-my-bash-setup_manually() {
	printf " \n Setting up ohmybash/oh-my-bash . \n"
	## oh-my-bash official installer
	## bash -c "$(curl -fsSL https://raw.githubusercontent.com/ohmybash/oh-my-bash/master/tools/install.sh)"
	# curl -ksSLO https://raw.githubusercontent.com/ohmybash/oh-my-bash/master/tools/install.sh
	## bash will not exit after installing oh-my-bash
	# printf " \n exit" >>./install.sh
	# bash ./install.sh
	# rm ./install.sh
	# printf " \n \n" >>~/.bashrc
	printf "\nexport OSH=\"\$HOME/.oh-my-bash/\" " >>~/.bashrc

	git clone --depth=1 https://github.com/ohmybash/oh-my-bash.git ~/.oh-my-bash/
	curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/bash_plugins/oh-my-bash_bashrc_default
	printf " \n" >>~/.bashrc
	cat oh-my-bash_bashrc_default >>~/.bashrc
# printf "\nexport ZSH=\"\$HOME/.oh-my-zsh/\"\nsource \"\$ZSH/oh-my-zsh.sh\" \nsource \"\$ZSH/custom/plugins/oh-my-zshrc.sh\"" >>~/.zshrc
# 	printf " \n" >>~/.zshrc
# 	printf 'source $ZSH/oh-my-zsh.sh ' >>~/.zshrc
printf "\nsource \"\$OSH/custom/plugins/oh-my-bashrc.sh\"" >>~/.bashrc
	printf "export OSH=\"\$HOME/.oh-my-bash/\"\nsource \"\$OSH/oh-my-bash.sh\"" > "$OSH/custom/plugins/oh-my-bashrc.sh"
## ohmyzsh did not start on termux on Android . we need to source ohmyzsh again.
	printf " \n ohmybash/oh-my-bash was installed. \n"
	printf " \n Would you like to enable random theme for oh-my-bash ? [y/n] \n"
	read answer
	if [ "$answer" != "${answer#[Yy]}" ]; then
		if [ -e "$(which sed)" ]; then
			## perl command output nothing
			## perl -pe 's/OSH_THEME=\K\d+/random/' ~/.bashrc > ~/.bashrc
			## theme font is default theme of oh-my-bash
			mv -f ~/.bashrc ~/.bashrc.old
			sed '/^OSH_THEME/s/=.*$/=\"random\"/g' ~/.bashrc.old >~/.bashrc
		else
			printf " \n We could not find sed executable file.  \n Please install sed by package manager i.e. Homebrew. \n"
		fi
	else
		printf " \n The default theme of oh-my-bash is enabled. \n"
	fi
}

function powerlevel10k-setup() {
	printf " \n Setting up romkatv/powerlevel10k . \n"
	## install powerlevel10k into ohmyzsh. start
	## Install powerlevel10k into ohmyzsh so it can be used as a random theme.
	# znap source romkatv/powerlevel10k
	## execute znap source romkatv/powerlevel10k command on zsh startup will make powerlevel10k be the only available theme.
	## echo 'znap source romkatv/powerlevel10k' >>~/.zshrc
	# cd ~/zsh-snap
	# mv powerlevel10k ohmyzsh/custom/themes/
	# cd ~/zsh-snap
	# ln -s ohmyzsh/custom/themes/powerlevel10k/
	# cd ~
	# printf " \n \n Use this command to use powerlevel10k theme. \n Or write this command into ~/.zshrc file. \n \n"
	# printf "        znap prompt ohmyzsh/ohmyzsh powerlevel10k"
	# printf " \n romkatv/powerlevel10k was installed. \n"
	
	## powerlevel10k official installer
	git clone --depth=1 https://github.com/romkatv/powerlevel10k.git "$ZSH/custom/themes/powerlevel10k"
	if [ -e "$(which sed)" ]; then
			## perl command output nothing
			## perl -pe 's/OSH_THEME=\K\d+/random/' ~/.bashrc > ~/.bashrc
			## theme font is default theme of oh-my-bash
			mv -f ~/.zshrc ~/.zshrc.old
			sed '/^ZSH_THEME/s/=.*$/=\"powerlevel10k\/powerlevel10k\"/g' ~/.zshrc.old >~/.zshrc
			printf " \n powerlevel10k is enabled as zsh theme. \n"
		else
			printf " \n We could not find sed executable file.  \n Please install sed by package manager i.e. Homebrew. \n"
		fi
	## install powerlevel10k into ohmyzsh. End
}


function ohmyzsh_setup(){
	printf " \n Setting up ohmyzsh/ohmyzsh. \n"
	 # curl -ksSLO https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh
	## zsh will not exit after installing ohmyzsh, therefore plugins_setup will be interupted.
	# printf " \n exit" >>./install.sh
	 curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/zsh_plugins/install.sh
	 zsh ./install.sh
	 rm ./install.sh
	 printf " \n Would you like to enable random theme for zsh ? [y/n] \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		# printf " \n znap prompt ohmyzsh/ohmyzsh random \n" >>~/.zshrc
		printf " \n" >>~/.zshrc
		printf 'ZSH_THEME="random" ' >>~/.zshrc
		printf " \n" >>~/.zshrc
printf " \n random theme for zsh is enabled. \n"
	else
		#echo No
		printf " \n" >>~/.zshrc
		printf 'ZSH_THEME="robbyrussell" ' >>~/.zshrc
		printf " \n" >>~/.zshrc
		printf " \n default theme robbyrussell of ohmyzsh is enabled. \n"
	fi
		## zsh random theme . End.

	printf " \n ohmyzsh/ohmyzsh was installed. \n"
	## install ohmyzsh via zsh-snap. End

	# powerlevel10k setup. start.
	printf " \n romkatv/powerlevel10k is a theme for Zsh. It emphasizes speed, flexibility and out-of-the-box experience. \n\n Would you like to install romkatv/powerlevel10k as ohmyzsh theme ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		powerlevel10k-setup
	else
		#echo No
		printf " \n Skipped romkatv/powerlevel10k installation. \n"
	fi
	# powerlevel10k setup. End.
	## install powerlevel10k. end.
}


function ohmyzsh_setup_manually() {
	printf " \n Setting up ohmyzsh/ohmyzsh. \n"
	## install ohmyzsh via zsh-snap. start
	## Install ohmyzsh outside zsh-snap may cause compatibility issues between ohmyzsh and zsh-snap.
	## Use this command to execute desired plugins of ohmyzsh.
	# znap source ohmyzsh/ohmyzsh lib/{git,theme-and-appearance}
	## splash symbol following directory name
	# mv -f ~/Git/ohmyzsh/* ~/.oh-my-zsh/*
	# printf 'znap source ohmyzsh/ohmyzsh lib/{git,theme-and-appearance}' >>~/.zshrc
	## Path to your oh-my-zsh installation.
	git clone --depth=1 https://github.com/ohmyzsh/ohmyzsh.git ~/.oh-my-zsh/
	 znap source ohmyzsh/ohmyzsh
	# printf " \n \n \n" >>~/.zshrc
	printf "\nexport ZSH=\"\$HOME/.oh-my-zsh/\"\nsource \"\$ZSH/oh-my-zsh.sh\" \nsource \"\$ZSH/custom/plugins/oh-my-zshrc.sh\"" >>~/.zshrc
# 	printf " \n" >>~/.zshrc
# 	printf 'source $ZSH/oh-my-zsh.sh ' >>~/.zshrc
	printf "export ZSH=\"\$HOME/.oh-my-zsh/\"\nsource \"\$ZSH/oh-my-zsh.sh\"" > "$ZSH/custom/plugins/oh-my-zshrc.sh"
## ohmyzsh did not start on termux on Android . we need to source ohmyzsh again.
# printf " \n" >>~/.zshrc
		## zsh random theme . start.
		# printf " \n \n Use this command to use a random theme. \n Or write this command into ~/.zshrc file. \n \n"
	# printf "        znap prompt ohmyzsh/ohmyzsh random"
	printf " \n Would you like to enable random theme for zsh ? [y/n] \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		# printf " \n znap prompt ohmyzsh/ohmyzsh random \n" >>~/.zshrc
		printf " \n" >>~/.zshrc
		printf 'ZSH_THEME="random" ' >>~/.zshrc
		printf " \n" >>~/.zshrc
printf " \n random theme for zsh is enabled. \n"
	else
		#echo No
		printf " \n" >>~/.zshrc
		printf 'ZSH_THEME="robbyrussell" ' >>~/.zshrc
		printf " \n" >>~/.zshrc
		printf " \n default theme robbyrussell of ohmyzsh is enabled. \n"
	fi
		## zsh random theme . End.

	printf " \n ohmyzsh/ohmyzsh was installed. \n"
	## install ohmyzsh via zsh-snap. End

	# powerlevel10k setup. start.
	printf " \n romkatv/powerlevel10k is a theme for Zsh. It emphasizes speed, flexibility and out-of-the-box experience. \n\n Would you like to install romkatv/powerlevel10k as ohmyzsh theme ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		powerlevel10k-setup
	else
		#echo No
		printf " \n Skipped romkatv/powerlevel10k installation. \n"
	fi
	# powerlevel10k setup. End.
	## install powerlevel10k. end.
}


function zsh-autocomplete-setup() {
	## fish-like autocomplete by these 3 plugins . start.
	printf "\nSetting up fish-like autocompletion plugins for zsh.\n"
	curl -ksSLO https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/zsh_plugins/fish-like.plugin.zsh
	# printf " \n \n" >>~/.zshrc
	# cat ./zsh-autocomplete-setup.sh >>~/.zshrc
	# printf " \n \n" >>~/.zshrc
	mv ./fish-like.plugin.zsh ~/Git/fish-like.plugin.zsh
	printf "source ~/Git/fish-like.plugin.zsh"
	
	# znap source marlonrichert/zsh-autocomplete 
	# znap source zsh-users/zsh-autosuggestions
	# znap source zsh-users/zsh-completions
	# znap source zsh-users/zsh-syntax-highlighting

        ## load plugins manually because znap is not compatible with msys2. 
	# source ~/Git/zsh-autocomplete/zsh-autocomplete.plugin.zsh 
	# source ~/Git/zsh-autosuggestions/zsh-autosuggestions.plugin.zsh 
	# source ~/Git/zsh-completions/zsh-completions.plugin.zsh 
	# source ~/Git/zsh-syntax-highlighting/zsh-syntax-highlighting.plugin.zsh
	
	printf "\nfish-like autocompletion plugins for zsh are installed.\n"
	## fish-like autocomplete. end.
}


function zsh-plugins-setup() {
	printf " \n \n" >>~/.zshrc
	printf 'export ZSH="$HOME/.oh-my-zsh/" ' >>~/.zshrc
	  ## termux on Android does not load ohmyzsh on startup.
       # printf " \n source ~/.zshrc " >>~/.zprofile

	## install marlonrichert/zsh-snap . start
	printf " \n Setting up marlonrichert/zsh-snap . \n"
	## copy zsh plugins  default settings to ~/.zshrc
	curl -ksSLO  https://github.com/MilkyMAISHIRANUI/unix_shell_plugins_setup/raw/main/zsh_plugins/zshrc_default
	printf " \n \n" >>~/.zshrc
	cat zshrc_default >>~/.zshrc
	printf " \n \n" >>~/.zshrc
	rm ./zshrc_default

	## zsh-snap official installer
	printf " \n \n Please keep the default installation directory unless you know what you are doing. \n \n"
	## install znap in official default path
	git clone --depth 1 -- https://github.com/marlonrichert/zsh-snap.git ~/Git/zsh-snap
	chmod +x ~/Git/zsh-snap/znap.zsh
	source ~/Git/zsh-snap/znap.zsh
	## use zshrc-default instead of echo >> zshrc . echo does not support text format well.
	## echo 'source ~/Git/zsh-snap/znap.zsh' >> ~/.zshrc
	## zshrc-default should not includes zsh-autocomplete.
	printf " \n marlonrichert/zsh-snap was installed. \n"
	## install marlonrichert/zsh-snap . End

	## marlonrichert/zsh-autocomplete setup . start.
	printf " \n marlonrichert/zsh-autocomplete adds real-time type-ahead autocompletion to Zsh.  \n\n Would you like to install marlonrichert/zsh-autocomplete ? [y/n]  \n"
	read answer

	if [ "$answer" != "${answer#[Yy]}" ]; then
		#echo Yes
		zsh-autocomplete-setup
	else
		#echo No
		printf " \n Skipped marlonrichert/zsh-autocomplete installation. \n"
	fi
	## marlonrichert/zsh-autocomplete setup . end .

	
}


function exit_succeeded_cleanup() {
	printf "Setup completed. \n If you like this script, please give it a star. \n"
	cd "$last_working_directory"
	rm ./unix_shell_plugins_setup.sh
	cd "$last_working_directory"
	exit 0
}

function exiting_cleanup() {
	printf " \n Setup completed. \n  Open a new terminal window to enjoy it.  \n If unix shell went wrong, please follow this guide. \n  \n https://github.com/marlonrichert/zsh-autocomplete#manual-installation   \n \n You may try to rename or delete dotfiles such as ~/.zshrc , ~/.zprofile , ~/.p10k.zsh , ~/.bashrc , ~/.bash_profile, ~/.config/fish/conf.d , and the folder of plugins ( usually at ~/ ) . \n Then execute this script again.  \n \n  If you like this script, please give it a star on its home page. \n \n"
	cd "$last_working_directory"
	rm ./unix_shell_plugins_setup.sh
	cd "$last_working_directory"
	exit 0
}

function exit_canceled_cleanup() {
	printf " \n Setup canceled. Your system was not modified.  \n If you like this script, please give it a star. \n"
	cd "$last_working_directory"
	rm ./unix_shell_plugins_setup.sh
	cd "$last_working_directory"
	exit 1
}

main