#!/bin/sh
#
# pcprint  Print data on local-terminal printer (or on the printer connected to a PC).
#
# Syntax:  pcprint [ -noformfeed | -noff | -noleadff ] filename ...
#
#       -noformfeed - does not send a form feed either before or after any file
#       -noff       - same as noformfeed
#       -noleadff   - does not send a form feed before a file, but does send
#                     a form feed at the end (to eject the last page, just in
#                     case it didn't end on a page boundary).
#       you should specify at most one of these options.

# Remind the user to put their printer online.
echo "Turn on your printer..." >/dev/tty; sleep 3

USAGE="Usage: pcprint [ -noformfeed | -noff | -noleadff ] file ..."
CTRL_L_B4=`echo X | tr X '\014'`   # formfeed (Control-L) character before file
CTRL_L_AFTER=`echo X | tr X '\014'`     # formfeed character after last file

# Formfeed can be disabled by passing "-noformfeed" as the first argument
if [ $# -ge 1 ]; then
    case "$1" in 
        -noformfeed | -noff) CTRL_L_AFTER=""
                             CTRL_L_B4=""
                             shift;;
        -noleadff)   CTRL_L_B4=""
                     shift;;
        *)      :;;
    esac
fi

#  Make sure they didn't specify more than one option
if [ $# -ge 1 -a "`echo \'$1\' | cut -c2`" = "-" ]; then
  echo "You cannot specify more than one option" >&2
  echo "$USAGE" >&2
  exit 1
fi

# Constants:
ESCAPE=`echo X | tr X '\033'`   # Store escape character
PrintOn="${ESCAPE}[5i"          # Hard code if don't have tput
PrintOff="${ESCAPE}[4i"         # ditto (these are for vt100 terminal)
Tmpfile=/tmp/`basename $0`$$    # File containing text to print

# Set trap to erase temp file and announce signal receipt:
trap 'rm -f $Tmpfile 2>/dev/null; exit' 0
trap 'echo "Interrupted by signal" >&2; exit' 1 2 3 15  

# Figure out how to do echo without newline
if [ -z "`echo 'hello\c' | sed 's/[^c]//g'`" ]; then 
    N='';  C='\c'
else 
    N='-n';  C=''
fi

# Process command-line argument(s):
case $# in

    # if there are no arguments then check whether stdin has been redirected
    # if not then exit, otherwise read from stdin
    0)  [ -t 0 ] && echo "$USAGE">&2 && exit 1
        (echo $N "$CTRL_L_B4$C" ; cat - ) > $Tmpfile ;;    # Input is from pipe

    # Files were specified on the command line, so process each file if it
    # is readable.
    *)  for File in $* ; do
            if [ ! -r $File ]; then
                echo "Cannot read \"$File\"" >&2
            else
                (echo $N "$CTRL_L_B4$C" ; cat $File) >> $Tmpfile
            fi
        done ;;
esac

#  Exit if there are no files to print:
if [ ! -s $Tmpfile ]; then
    echo "Exiting, no readable files were located" >&2 ; exit 2
fi

# Get local-terminal printer-control codes if not already defined:
[ ! "$PrintOn" ] && PrintOn=`tput mc5`          # Get printer-on and 
[ ! "$PrintOff" ] && PrintOff=`tput mc4`        # printer-off capability

# Make sure the printer-on and printer-off capabilities exist:
if [ ! "$PrintOn" -o ! "$PrintOff" ]; then
    echo "Your terminal \"$TERM\" can't control your local printer" >&2
    exit 3 
fi

# Output printer-on code, files, formfeed, printer-off code:
# This order (along with the "control-L" that we put on the first line of
# each file) is important to prevent the output from being skewed, and to 
# ensure the last page is ejected from the printer
echo $N "$PrintOn$C"; cat $Tmpfile; echo $N "$CTRL_L_AFTER$C"; echo $N "$PrintOff$C"