HAS is Home Accounting System written in AT&T AWK
Copyright (C) 2008 Matous J. Fialka, <http://mjf.cz/>
Released under the terms of The MIT License

DESCRIPTION

This program parses input data and produces output while performing
basic arithmetical expressions as it is described in the next sections
of this document.

USAGE

   $ has.awk [ filename [ filename ... ] ]

SYNTAX

   <line>     ::= <op-line> | <anything>
   <op-line>  ::= <op> [ <var> | <val> ] [ <assign> ]
   <op>       ::= operator
   <var>      ::= variable
   <val>      ::= constant
   <assign>   ::= ":" [ <var> ]
   <anything> ::= anything

OPERATORS

   Answer:

      ?   get answer or get value if variable specified
      !   set answer or get value if variable specified
      =   get answer and reset it to 0

   Arithmetics:

      +   add
      -   substract
      x   multiply
      /   divide
      %   percent

Default operator is the `+' operator. If operator is not specified in
the beginning of a line and the line begins with blank character(s) last
operator used is used. Multiple blank lines are squeezed into single
one. Everything else is just printed out and formated to 72 characters
wide paragraphs.

Althought this program is quite usable as it is now keep in mind that it
is also proof of concept only and that the syntax may change in the
future. Also notice that the output stream can be parsed again so that
you will obtain exactly the same output. Therefor next program call will
still work as expected:

   $ has.awk test.has | has.awk | has.awk | has.awk | has.awk | less

If you like to colorize your HAS output use the HASColorize SED script
provided like this:

   $ has.awk test.has | hascolorize.sed | less -R

See and play with the `test.has' file to know more about this program.