LOC Program for VHDL

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I've been asked to count the number of lines of code (LOC) for VHDL. I need to count the physicial lines of code, logical lines of code, and also the number of commented lines.

Anyone have any ideas on an algorithm I can use for this?

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There is likely a unix tool that already does most of this, eg. awk or sed.

Alternatively write a Perl/Tcl/bash script that parses a file a line at a time, and decides whether the line is a comment, space, or code.

However, distinguishing the lines of VHDL code as being logical might be a little difficult or meaningless, since the following line of code:

c <= a and b;

can also be written as

process(a,b)
begin
      if ((a = '1') and (b = '1')) then
           c <= '1';
      else
           c <= '0';
      end if;
end process;

Ideally you should 'count' the second form as one line of 'logical' code right?

Cheers,

Dave