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/IRC client in pure bash 4

Created March 28, 2016 16:57
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  1. @invalid-email-address Anonymous created this gist Mar 28, 2016.
    148 changes: 148 additions & 0 deletions IRC client in pure bash 4
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,148 @@
    #!/bin/bash

    #no PATH, no way to accidently run any programs
    PATH=''

    #useful variables
    term_height=0
    term_width=0
    term_scroll_height=0
    status_line_row=0
    irc_host=''
    irc_channel=''
    irc_nick=''


    function scroll_bottom() {
    echo -en '\e[999B'
    }

    #figure out terminal height, NOTE: moves cursor to bottom of terminal
    function term_height() {
    echo -en '\e[999B\e[6n'
    read -s -r -d'['
    read -s -r -d';' term_height
    read -s -r -d'R' term_width
    echo -en '\e[999D'
    }

    #set the area the terminal is allowed to scroll in
    function scroll_helper() {
    term_scroll_height=$((term_height-2))
    status_line_row=$((term_height-1))
    echo -en "\e[0;${term_scroll_height}r"
    }

    function bottom_line() {
    echo -en "\e[${term_height};0f"
    }

    function paste_data() {
    echo -en '\e7' "\e[${term_scroll_height};0f" '\n'
    echo -n " $1"
    echo -en '\e8'
    }

    function status_line() {
    echo -en '\e7' "\e[${status_line_row};0f" '\e[2K'
    echo -en "\e[4;44mSTATUS: $irc_nick in $irc_channel @ $irc_host\e[0m"
    echo -en '\e8'
    }

    function init_screen() {
    echo -en '\e[r' #reset screen
    term_height
    scroll_helper
    bottom_line
    }

    function net_fd_helper() {
    local buff=''

    #close 44 if open, then open read/write
    exec 44>&-
    exec 44<>"$1"

    #delay slightly to improve chance of success
    #read -s -r -t1 -u 44

    #try connecting, sometimes JOIN won't work here and will have to be done manually
    echo "NICK $irc_nick" >&44
    echo "USER $irc_nick 8 * :${HOSTNAME} ${USER}" >&44
    echo "JOIN $irc_channel" >&44

    while true
    do
    while IFS='' read -s -r -t1 -u 44
    do
    case "$REPLY" in
    ( :irc* )
    paste_data "$REPLY"
    ;;
    ( PING* )
    paste_data "$REPLY"
    buff="${REPLY##*:}"
    paste_data "PONG :$buff"
    echo "PONG :$buff" >&44
    ;;
    ( * )
    buff="${REPLY%%\!*}"
    REPLY="${REPLY#*:*:}"
    buff="<${buff/:/}> $REPLY"
    paste_data "$buff"
    ;;
    esac
    done


    while IFS='' read -r -t1
    do
    status_line
    echo -en '\e[2K\r> '
    case "$REPLY" in
    ( :shell* )
    buff="${REPLY#*\ }"
    paste_data "$buff"
    eval "$buff"
    ;;
    ( :reset )
    init_screen
    break
    ;;
    ( /JOIN* )
    irc_channel="${REPLY##*\ }"
    echo "${REPLY/\//}" >&44
    ;;
    ( /QUIT* )
    echo "QUIT :${REPLY#*\ }" >&44
    exec 44>&-
    exit 0
    ;;
    ( /* )
    echo "${REPLY/\//}" >&44
    ;;
    ( "" )
    break
    ;;
    ( * )
    echo "PRIVMSG $irc_channel :$REPLY" >&44
    ;;
    esac

    buff="<$irc_nick> ${REPLY}"
    paste_data "$buff"
    done
    done
    }

    function main() {
    local irc_fd=''
    scroll_bottom
    read -p 'IRC Server (eg irc.rizon.net): ' -e -r irc_host
    read -p 'IRC Channel (eg #foobar): ' -e -r irc_channel
    read -p 'IRC Nickname (eg egg_lover): ' -e -r irc_nick
    init_screen
    net_fd_helper "/dev/tcp/$irc_host/6667"
    }

    main