EXT:ELASTIC-NEWLINE
The function (
is like
EXT:ELASTIC-NEWLINE
[stream
])FRESH-LINE
but the other way around: It outputs a conditional newline
on stream
, which is canceled if the next
output on stream
happens to be a newline. More precisely, it
causes a newline to be output right before the next character is
written on stream
, if this character is not a newline.
The newline is also output if the next operation on the stream is
FRESH-LINE
, FINISH-OUTPUT
, FORCE-OUTPUT
or CLOSE
.
The functionality of EXT:ELASTIC-NEWLINE
is also available through
the FORMAT
directive ~.
.
A technique for avoiding unnecessary blank lines in output is to
begin each chunk of output with a call to FRESH-LINE
and to terminate it
with a call to EXT:ELASTIC-NEWLINE
.
See also Section 21.6, “Newline Convention”.
These notes document CLISP version 2.49 | Last modified: 2010-07-07 |