#!/bin/bash
# ubuntu 14.04/16.04 系统初始化配置脚本.
set -ex

sudo_home=
if test -n "${SUDO_USER}" -a -n "${SUDO_UID}" -a -n "${SUDO_GID}" ; then
	eval sudo_home=~"${SUDO_USER}"
fi

rsync_to_home() {
	if test -n "${sudo_home}" ; then
		rsync -ai "${@}" "${sudo_home}/" --chown "${SUDO_UID}:${SUDO_GID}"
	fi
	rsync -ai "${@}" ~/
}

# apt
#sed -re '/^#*deb/ s,\S+(/ubuntu(-ports)?/?),http://mirrors.aliyun.com\1,' /etc/apt/sources.list -i
apt-get update
#apt-get install aptitude -y
DEBIAN_FRONTEND=noninteractive apt-get install debconf-utils apt-utils whiptail -y
apt-get install locales util-linux less man-db lsb-release -y
apt-get install iputils-ping iputils-tracepath traceroute iproute2 dnsutils net-tools rsync curl -y
apt-get install jq moreutils tree -y
apt-get install bash-completion -y

# locales
locale-gen en_US.UTF-8 zh_CN.UTF-8
# WSL 不支持使用双引号, 如 `LANG="en_US.UTF-8"` (?)
update-locale --reset LANG=en_US.UTF-8

#container=
#eval "$(grep -z "^container=" /proc/1/environ)"

: ${update_localtime:=false}
if ${update_localtime} && ! mountpoint -q /etc/localtime ; then
	# tzdata 软件包较特殊，其希望尽量保持当前配置不变.
	# 可隐藏当前配置以使其使用 debconf-set-selections 配置.
	# 查看 /var/lib/dpkg/info/tzdata.config 脚本可知,
	# 其优先检查软连接 /etc/localtime 或配置文件 /etc/timezone 获取当前配置.
	if test -L /etc/localtime ; then rsync -ai "$(readlink -f /etc/localtime)" /etc/localtime ; fi
	rm -f /etc/timezone
	echo $'tzdata tzdata/Areas select Asia\ntzdata tzdata/Zones/Asia select Shanghai' | debconf-set-selections
	DEBIAN_FRONTEND=noninteractive apt-get install tzdata -y
	DEBIAN_FRONTEND=noninteractive dpkg-reconfigure tzdata
fi

# .bashrc
# fix ll, do not use "-a", use "-Al"
sed -re 's/^(alias ll='\''ls -).*?a.*?('\'')/#\0\n\1Al\2/' /etc/skel/.bashrc ~/.bashrc ${sudo_home:+"${sudo_home}"/.bashrc} -i
# fix PS1='\n...\n\$ ' , 参考 bashrc-fix-ps1.sh 脚本
(
fixPs1='PS1="$(sed -re '\''s#(\\n)*(\\\$\s*)$#\\n\2# ; /\\n.*\\u/ b ; s#^#\\n#'\'' <<< "$PS1")" # 确保 PS1 以 r'\''\n\$'\'' 结尾'
sed -re "\$ a $(perl -E "say quotemeta" -s -- -_="${fixPs1}")" -e '/^PS1="\$\(sed\s/ d' /etc/skel/.bashrc ~/.bashrc ${sudo_home:+"${sudo_home}"/.bashrc} -i
)

# inputrc
cat <<'EOF' | tee /etc/skel/.inputrc
$include /etc/inputrc

# mappings for Ctrl-up-arrow and Ctrl-down-arrow for history search
"\e[1;5A": history-search-backward
"\e[1;5B": history-search-forward

"\ep": history-search-backward
"\en": history-search-forward
EOF
rsync_to_home /etc/skel/.inputrc

#if test -f /lib/systemd/system/getty@.service ; then
#	sed -r -e '/^Environment=/ s#$# TERM=xterm#' /lib/systemd/system/getty@.service > /etc/systemd/system/getty@.service
#fi

# fix grub config
#if test -f /etc/default/grub ; then
#	sed -r -e 's/^(GRUB_DEFAULT=).*/\1saved/g' -e '/^GRUB_HIDDEN/ s/^/#/g' -e 's/^(GRUB_TIMEOUT=).*/\13/g' -e 's/^(GRUB_CMDLINE_LINUX_DEFAULT=).*/\1"quiet"/g' -e $'/^GRUB_CMDLINE_LINUX=/ a\\\nGRUB_DISABLE_SUBMENU=y' -e '/^GRUB_DISABLE_SUBMENU=/ d' /etc/default/grub -i
#	update-grub
#fi

# adduser 用户名允许使用 "."
sed $'/^NAME_REGEX=/ d; /^#NAME_REGEX=/ a \\\nNAME_REGEX="^[a-z][-a-z0-9_.]*$"' /etc/adduser.conf -i

# vim
apt-get install vim -y
update-alternatives --set editor /usr/bin/vim.basic

tee /etc/vim/vimrc.local <<'EOF'
set noet ts=4 sw=0
set fencs=ucs-bom,utf-8,default,gbk,latin1
set nobackup
set backupdir=~/tmp/vim,/tmp
set noundofile
set undodir=~/tmp/vim,/tmp
EOF
#>
sed -r -e '/^\s*autocmd\s+.*setlocal textwidth=/ s#^#"#' -e '$ a'$'\n' -e '$ a set nobackup' -e '$ a set noundofile' -e '$ a set modeline' /usr/share/vim/vim*/vimrc_example.vim > /etc/skel/.vimrc
rsync_to_home /etc/skel/.vimrc

# tmux
apt-get install tmux -y
tee /etc/tmux.conf <<'EOF'
set -g history-limit 5000
set -g default-terminal 'xterm'
set -g xterm-keys on
#set -g alternate-screen off
set -ga terminal-overrides ',xterm*:smcup=:rmcup=:Tc'

# avoid tmux execute default-shell as login shell by default
set -g default-command /bin/bash

set -g prefix C-a
unbind-key C-b
bind-key C-a send-prefix
set -g mode-keys vi
set -g status-keys vi
EOF
#>

# language-pack
#apt-get install language-pack-zh-hans -y

# git
#apt-get install git -y