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Annotation of researchv8dc/cmd/eqn/NEW, revision 1.1

1.1     ! root        1: Most of these changes owe thanks to Mary Carter,
        !             2: whose efforts during the summer of 1984 provided
        !             3: some code and the impetus to start thinking about
        !             4: eqn again.
        !             5: 
        !             6: 
        !             7: 1.  Fixed long-standing bug involving nested
        !             8: from-to constructs.
        !             9: 
        !            10: 2.  Output guaranteed to preserve font that was
        !            11: in effect upon entry (if there are no font changes
        !            12: within quoted strings).
        !            13: 
        !            14: 3.  The right delimiter is no longer significant
        !            15: within display equations.
        !            16: 
        !            17: 4.  Macros with arguments, as in grap and pic.
        !            18: Parentheses are treated somewhat differently:
        !            19: If an embedded left paren is found in a token,
        !            20: then the characters to its left are checked to
        !            21: see if they are a macro name.  If they are, the
        !            22: paren is assumed to mark the beginning of the 
        !            23: argument list.  Otherwise, the token is treated
        !            24: just like any other.
        !            25: 
        !            26: 5.  File inclusion:  include (or copy) "filename"
        !            27: is replaced by contents of file.  .EQ and .EN are
        !            28: ignored within inclusions.  Filename "-" is a synonym for
        !            29: standard input on the command line.
        !            30: 
        !            31: 6.  Font names can be given as strings, as in
        !            32:        font CW { ... } or gfont CW
        !            33: 
        !            34: 7.  Checks environment variable TYPESETTER;  default
        !            35: is still 202.
        !            36: 
        !            37: 8.  An optional separation distance can be specified
        !            38: for a pile or col:  lcol 33 {... above ...} adds 33/100 em
        !            39: of separation between the elements instead of the default;
        !            40: negative values permitted.
        !            41: pile, etc., have become synonyms for col, etc.
        !            42: 
        !            43: 9.  Eqn attempts to print appropriately for current size,
        !            44: obviating the need for most uses of size {...} and gsize.
        !            45: It won't always be right, but it will be close for documents
        !            46: printed in the usual range of sizes.
        !            47: 
        !            48: 10. A fair amount of fiddling has been done to details of
        !            49: positioning;  the output seems to be better looking.
        !            50: 
        !            51: 11. ifdef whatever / is replaced by this if defined /
        !            52: The proper TYPESETTER name is defined already.
        !            53: 
        !            54: 12. Error messages are somewhat better as well.  Errors
        !            55: passed on to troff will be identified by source file and
        !            56: line number in the eqn input.

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