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pprint.pl -- Pretty Print Prolog terms
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This module is a first start of what should become a full-featured pretty printer for Prolog terms with many options and parameters. Eventually, it should replace portray_clause/1 and various other special-purpose predicates.

To be done
- This is just a quicky. We need proper handling of portray/1, avoid printing very long terms multiple times, spacing (around operators), etc.
- Use a record for the option-processing.
- The current approach is far too simple, often resulting in illegal terms.
Source print_term(+Term, +Options) is det
Pretty print a Prolog term. The following options are processed:
output(+Stream)
Define the output stream. Default is user_output
right_margin(?Column)
Width of a line. If the output is a tty and tty_size/2 can produce a size the default is the number of columns minus 8. Otherwise the default is 72 characters. If the Column is unbound it is unified with the computed value.
left_margin(+Integer)
Left margin for continuation lines. Default is 0.
tab_width(+Integer)
Distance between tab-stops. Default is 8 characters.
indent_arguments(+Spec)
Defines how arguments of compound terms are placed. Defined values are:
false
Simply place them left to right (no line-breaks)
true
Place them vertically, aligned with the open bracket (not implemented)
auto (default)
As horizontal if line-width is not exceeded, vertical otherwise.
An integer
Place them vertically aligned, <N> spaces to the right of the beginning of the head.
operators(+Boolean)
This is the inverse of the write_term/3 option ignore_ops. Default is to respect them.
write_options(+List)
List of options passed to write_term/3 for terms that are not further processed. Default:
    [ numbervars(true),
      quoted(true),
      portray(true)
    ]
fullstop(Boolean)
If true (default false), add a full stop (.) to the output.
nl(Boolean)
If true (default false), add a newline to the output.