#!/bin/bash
#### Add new records to file "pres" ####
file=pres

## Assign an ID number.
touch $file
if test -w
then
        let number=`wc -l $file`
        let id=$number+1
else
        echo "File $file cannot be written!"
        exit
fi


if [ "$1" = "" ] || [ "$2" = "" ]
then
   echo USAGE:
   echo "   addname First Middle Last"
   echo "   addname First Last"
fi


## Check args
if test $# -gt 3
then
        echo "ERROR:  too many arguments (2 or 3 only)"; exit
fi
#
if test -z "$1" || test -z "$2"
then
        echo "ERROR:  addname requires two or three arguments."; exit
fi

## Extract the name.
if test "$3" = ""
then
        first="$1"
        middle=""       # No middle name
        last="$2"
else
        first="$1"
        middle="$2"
        last="$3"
fi
name="$first:$middle:$last"

## Check for duplicate name.
echo NAME: $name
grep "$name" $file
dup=`grep "$name" $file`
if test -n "$dup"
then
        echo "ERROR:  Duplicate name:  $name"; exit
fi

## Inauguration year.
echo -n "Year:  "
read year
if test "$year" -ge 1788
then
        echo "ERROR:  Must be a year greater than 1788"; exit
fi


## Now, get the age at inauguration.
echo -n "Year of birth: "
read born
if test $born -le 0
then
        echo "ERROR:  Must be a year greater than zero."; exit
fi
let age=$year-$born
echo "Age at inauguration:  $age"

## Job (party)
echo -n "Party:         "
read party


## Construct the record.
record="$year:$name:$id:$age:$party"
echo "ADD RECORD $id:  $record"
echo $record >> $file           # Append to file
echo `wc -l $file` records on file.
exit