#!/bin/sh

# (c) Igor Chubin, igor@chub.in, 2004-2006

# Environment variables set by the script:
#
#       L3_SESSION_ID   - uniq id of the LiLaLo-session
#       L3_PARENT_TTY   - name of tty on which script is running
#       PS1             - intercative shell prompt in which LiLaLo hides
#                         various information about the command
#       L3_TAMPERED_EDITORS - list of editors which are tampered with functions


# Functions with the names starting _l3_ are internal.
# Such functions are unset before this rc script exits

_l3_editors_to_tamper='/bin/vi /usr/bin/vi /usr/bin/vim /bin/ee /usr/bin/ee /usr/bin/pico /usr/bin/nano /usr/local/bin/vim'

_l3_start()
{
    echo $- | grep -q i || return 0
    if _l3_is_running_here
    then
        _l3_env
        _l3_init_prompt
         l3_fix_prompt
        _l3_tamper_editors
        _l3_tamper_commands
        _l3_unset_internal
    else
        _l3_start_session
        _l3_run_script
    fi
}

# ===================== STAGE 1 ============================

_l3_is_running_here()
{
	ps waux | awk '{print $2" "$11 }' | grep -q ^$PPID" "script 
	return $?

# Check if ^^^^ run on Linux
# and del  vvvv this if it does

    export L3_TTY=`/usr/bin/tty` 
    uname -a | grep -qi bsd && bsd=yes
    proc_on_the_term=`w | grep "${L3_TTY##/dev/}" | awk '{print $8;}'`
    # freeBSD: 
    [ -n "$bsd" ] && \
    proc_on_the_term=`w | grep "${L3_TTY##/dev/tty}" | awk '{print $6;}'`

    [ -n "$proc_on_the_term" ] && echo $proc_on_the_term | grep -q script
}

_l3_start_session()
{
    export L3_SESSION_ID=${RANDOM}${RANDOM}${RANDOM}${RANDOM}-`date +%s`
    export L3_HOME=~/.lilalo/
    mkdir -p $L3_HOME

    tty=`/usr/bin/tty`
    uname -a | grep -qi bsd && bsd=yes
    parent=`cat /proc/$PPID/cmdline 2> /dev/null`
    [ -z "$parent" ] && parent="`ps waux | awk '{if ($2 == '$PPID') print $11; }'`"
    system=`uname -rs`
    login_from=`who | grep "${tty##/dev/}" | awk '{print $6;}' | tr -d '()'`
    #[ -n "$bsd" ] && login_from="" #FIXME!
    start_time=`date +%s`
    hostname=`hostname -f 2> /dev/null`
    [ -n "$bsd" ] && hostname=`hostname`

    cat <<INFO > $L3_HOME/$L3_SESSION_ID.info
<session>
    <local_session_id>$L3_SESSION_ID</local_session_id>
    <hostname>$hostname</hostname>
    <user>$USER</user>
    <uid>$UID</uid>
    <login_from>$login_from</login_from>
    <tty>$tty</tty>
    <system>$system</system>
    <parent>$parent</parent>
    <ppid>$PPID</ppid>
    <pid>$$</pid>
    <start_time>$start_time</start_time>
    <lang>$LANG</lang>
</session>
INFO

    unset parent system login_from start_time hostname tty
}

_l3_run_script()
{
    uname -a | grep -qi bsd && bsd=yes
    flush="-f"                          #linux
    [ -n "$bsd" ] && flush="-t 0"       #freebsd
    export L3_PARENT_TTY=`/usr/bin/tty`
    exec script $flush -q $L3_HOME/${L3_SESSION_ID}.script
}

# ===================== STAGE 2 ============================

_l3_env()
{
    trap l3_close_session 2
    trap l3_close_session EXIT
    true
}

l3_close_session()
{
    ( 
        echo '<history>'
        history | sed 's/&/\&amp;/; s/</\&lt;/g; s/>/\&gt;/g'
        echo '</history>'
    ) >> $L3_HOME/$L3_SESSION_ID.info
}

_l3_init_prompt()
{
    PS1='[\u@\h:\W]\$ '
    [ $UID = 0 ] \
        && PS1='\[\033[0;31m\]'$PS1'\[\033[0m\]' \
        || PS1='\[\033[0;32m\]'$PS1'\[\033[0m\]' \
    export PS1
}

l3_fix_prompt()
{
    export PS1='\[v2#\!#$?#$UID#$$#$(/bin/date +%s)$(l3_save_last_line)#$PWD#\033[1024D\033[K\]'$PS1
}

_l3_tamper_editors()
{
    for editor_file in $_l3_editors_to_tamper
    do
        [ -x $editor_file ] || continue
        editor_name=${editor_file##*/}
        eval "
        $editor_name() { 
            if [ -d \"\$1\" ] 
            then
                $editor_file \"\$1\"
                return \$?
            else
                TIME=\"\`date +%s\`\"
                DIR=\"\"
                [ \"\${1#/}\" = \"\$1\" ] && DIR=\"\$PWD/\"
                DIFFNAME=\"\${L3_SESSION_ID}_\${TIME}\`echo \$DIR\$1| sed s@_@__@ | sed 's@/@_@g'\`.diff\"
                old_file=\"/tmp/l3-saved-\$\$.\$RANDOM.\$RANDOM\"
                /bin/cp -- \"\$1\" \"\$old_file\" 2> /dev/null
                $editor_file \"\$@\" || ERR=\$?
                [ -e \"\$old_file\" ] \
                 && diff -u \"\$old_file\" \"\$1\" > \"\$L3_HOME/\$DIFFNAME\" 2> /dev/null \
                 || diff -u /dev/null \"\$1\"  > \"\$L3_HOME/\$DIFFNAME\" 2> /dev/null
                /bin/rm \"\$old_file\" 2> /dev/null
                return \$ERR
            fi
        }
        "
        L3_TAMPERED_EDITORS="$L3_TAMPERED_EDITORS $editor_name"
    done
    [ -n "$L3_TAMPERED_EDITORS" ] && export L3_TAMPERED_EDITORS
}

_l3_tamper_commands()
{
    tty()
    {
        [ -n "$L3_PARENT_TTY" ] && echo $L3_PARENT_TTY || /usr/bin/tty
    }
}

_l3_unset_internal()
{
    unset `set | grep '^_l3_.*()' | sed 's/()//'`
    unset `set | grep '^_l3_.*=' | sed 's/=.*//'`
}


l3shot()
{
    if [ -x "`which xwd`" ]
    then
        _l3_home=${L3_HOME:-~/.lilalo}
        shot_name="${L3_SESSION_ID}_`date +%s`".xwd
        echo -n Choose window to be shoot ... >&2
        [ -d ${_l3_home} ] || mkdir -p ${_l3_home}
        xwd -out "$_l3_home/$shot_name" \
        && echo Screenshot is written to ${_l3_home}/${shot_name} \
        && curl -s -F photo=@$_l3_home/$shot_name http://xgu.ru/l3-upload
    else
        {
            echo
            echo "Can't make screenshot :("
            echo 
            echo I must use program xwd to make screenshot, 
            echo but it seems not to be installed
            echo Try to find the program in the \"xbase-clients\" package
            echo
        }   >&2 
    fi
}

l3upload()
{
    if [ $# -lt 1 ]
    then
        echo Usage:
        echo 
        echo    l3upload "<filename>"
        echo
        echo "<filename>" - name of the file to upload
        return 1
    else
        source=$1 
        target="${L3_SESSION_ID}_`date +%s`"_"$(echo $source|sed s@.*/@@)"
        if echo $source | grep -q http://
        then
            curl -s "$source" > /tmp/$target 
        else 
            [ -r "$source" ] || { echo "l3upload: Can't open $source for reading" > /dev/stderr; return 1; }
            cp $source /tmp/$target
        fi
        echo Uploaded file name is ${target}
        curl -s -F photo=@/tmp/$target http://xgu.ru/l3-upload && rm -f /tmp/$target
    fi
}

# Append lines from "$@" files to the end of the shell history
hist_append ()
{
    eval $(cat "$@" | sed 's/"/\\\\"/g' | while read line; do echo history -s \"$line\"\;; done);
}

l3_save_last_line ()
{
    (
    echo '<cline>'
    history 1 | sed 's/&/&amp;/; s/</\&lt;/g; s/>/\&gt;/g'
    echo '</cline>'
    ) >> $L3_HOME/$L3_SESSION_ID.info
}

l3 ()
{
    case "$1" in
        on)
            echo switching on
        ;;
        off)
            echo switcing off
        ;;
        cd)
            echo l3cd="$2" > ~/.l3rc
        ;;
        pwd)
            grep ^l3cd= ~/.l3rc | sed s/[^=]*=//
        ;;
        *) 
            cat <<EOF
l3 [command]:

    cd new_context   - change current lilalo context
    pwd              - show current lilalo context
    on               - switch writing on (NOT IMPLEMENTED YET)
    off              - switch writing off (NOT IMPLEMENTED YET)

EOF
        ;;
    esac
}

l3cd()
{
    l3 cd "$@"
}

l3pwd()
{
    l3 pwd
}