#! /bin/sh
# #############################################################################

       NAME_="srfc"
       HTML_="search local rfc files"
    PURPOSE_="search local rfc file for a string, highlight found strings"
   SYNOPSIS_="$NAME_ [-hl] <n> <string>"
   REQUIRES_="standard GNU commands"
    VERSION_="1.1"
       DATE_="2000-03-15; last update: 2004-12-27"
     AUTHOR_="Dawid Michalczyk <dm@eonworks.com>"
        URL_="www.comp.eonworks.com"
   CATEGORY_="misc"
   PLATFORM_="Linux"
      SHELL_="bash"
 DISTRIBUTE_="yes"

# #############################################################################
# This program is distributed under the terms of the GNU General Public License

usage() {

echo >&2 "$NAME_ $VERSION_ - $PURPOSE_
Usage: $SYNOPSIS_
Requires: $REQUIRES_
Options:
     <n> an integer referring to the rfc file number 
     <string> the string to search for
     -h usage and options (this help)
     -l list the script"

exit 1
}

# path to local rfc dir
rfc=~/rfc

# args check
[ $# -eq 0 ] && { echo >&2 missing argument, type $NAME_ -h for help; exit 1; }

# enabling extended globbing
shopt -s extglob 

# arg handling and execution
case $1 in

    -h) usage ;;
    -l) more $0; exit 1 ;;
    +([0-9])) # main execution

        [ -f $rfc/rfc${1}.txt ] || { echo >&2 file $rfc/rfc${1}.txt does not exist; exit 1; }
        [ $2 ] || { echo >&2 missing second argument, type $NAME_ -h for help; exit 1; }
        grep -iC 5 --color=always $2 $rfc/rfc${1}.txt | more 
        [[ ${PIPESTATUS[0]} != 0 ]] && { echo >&2 string \"$2\" not found in $rfc/rfc${1}.txt; exit 1; }
        ;;

    *) echo invalid or missing argument, type $NAME_ -h for help ; exit 1 ;;
esac