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| #!/bin/bash
# LingYi
# 2016.03.23
#package: command
#coreutils: whoami
[[ -n $1 ]] && [[ -d $1 ]] && tmp_dir=${1%/}
username=${2:-$(whoami)}
username=${username:-NoBody}
tmp_dir=${tmp_dir:-/tmp}
message_file=.talk_${username}.$(date +%s)
message_judge_file=${message_file}.renew
lock_file=.talk.lock
#设置字体颜色
MY_COLOR='45;1;39'
my_color='32'
OTHER_COLOR='46;1;39'
other_color='34'
#同一个临时目录下，只能有两个用户同时使用
if [[ -e ${tmp_dir}/${lock_file} ]]; then
echo there have been two guys using the directory [\"${tmp_dir}\"], you can change it, and run again !!
echo Like this: sh talk.sh /mnt [UserName]
exit 2
fi
#创建两个临时文件，一个用于存储用户交互信息，另一个用于判断对方是否更新了信息
touch ${tmp_dir}/$message_file || exit 3
touch ${tmp_dir}/$message_judge_file || exit 3
chmod 666 ${tmp_dir}/$message_judge_file
echo 0 >${tmp_dir}/$message_judge_file
#判断对方是否在线，若在线，则设置对方相关信息，否则等待
function get_other_man()
{
if [[ $(ls -a ${tmp_dir} | grep talk |grep -E -v "$message_file|renew|lock" | wc -l) -eq 1 ]]; then
other_message_file=$( ls -a ${tmp_dir} | grep talk | grep -E -v "$message_file|renew|lock")
other_man=$( echo $other_message_file | awk -F '[._]' '{print $3}' )
other_message_judge_file=${other_message_file}.renew
other_message=$(cat ${tmp_dir}/$other_message_file)
[[ ! -f ${tmp_dir}/${lock_file} ]] && touch ${tmp_dir}/${lock_file}
fi
}
#后台监控函数
#用户监控对方是否仍然在线，以及是否更新了信息，如果更新了则打印对方发送的信息，并处理判断文件
function monitor()
{
local stop_monitor=false
trap 'stop_monitor=true' 20
while ! $stop_monitor
do
#若对方的临时文件消失，则标示对方已离线，自己退出对话
if [[ ! -e ${tmp_dir}/$other_message_judge_file ]]; then
echo -e "[1;31m${other_man} is offline !!![0m"
echo -e "[1;32mBye!!![0m"
kill -20 $MYPID
break
fi
#对方写入信息到自己的信息存储文件之后，会将此文件置为“1”，表示更新了信息
if [[ $(cat ${tmp_dir}/$other_message_judge_file) -eq 1 ]]; then
echo -e "[${OTHER_COLOR}mFrom $other_man[0m[1;31m:[0m"
echo -e "[${other_color}m$(cat ${tmp_dir}/$other_message_file)[0m"
echo -ne "[${my_color}m"
#打印了对方的信息之后，将对方的判断文件置为“0”，标示为已读
echo 0 >${tmp_dir}/$other_message_judge_file
fi
sleep 0.2
done
echo -ne "[0m"
}
#对方离线或自行退出后执行
function talk_over()
{
kill -20 $monitor_pid &>/dev/null
rm -fr ${tmp_dir}/$message_file
rm -fr ${tmp_dir}/$message_judge_file
rm -fr ${tmp_dir}/$lock_file &>/dev/null
sleep 0.2
STOP=true
echo
exit
}
trap 'talk_over' 2
clear
#判断对方是否在线，若不在线则一直等待，指导对方上线
get_other_man
[[ -z $other_man ]] && echo -e "[1;31mNo man to talk, please wait ...[0m"
while [[ -z $other_man ]]; do get_other_man; done
echo -e "[32m${other_man} is online, you can talk now.[0m"
MYPID=$$
monitor &
monitor_pid=$!
STOP=false
trap 'talk_over; STOP=true' 20
message="this is initialized words"
#stty erase ^H
#stty erase ^?
#对话主程序
while ! $STOP
do
[[ -z $other_man ]] && get_other_man
[[ -n $message ]] && echo -e "[${MY_COLOR}mI say[0m[1;31m:[0m"
echo -ne "[${my_color}m"
read message
echo -ne "[0m"
[[ $message == 'q' ]] && talk_over
[[ -z $message ]] && continue
#定义command:开头的字符串处理方式
#command:
if echo $message | grep -q '^command:'; then
$(echo $message | awk -F':' '{print $2}')
continue
fi
#定义ly:开头的字符串处理方式
#ly:
if echo $message | grep -q '^ly:'; then
message=$($(echo $message | awk -F':' '{print $2}'))
fi
#若有信息输入，则将信息写入自己的信息存储文件，并将判断文件置“1”（表示更新了文件）
echo "$message" >${tmp_dir}/$message_file
echo 1 >${tmp_dir}/$message_judge_file
done
echo
|
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