The delimited-I/O module can be accessed with:
(use-modules (ice-9 rdelim))
It can be used to read or write lines of text, or read text delimited by a specified set of characters.
Return a line of text from port if specified, otherwise from the
value returned by
(current-input-port). Under Unix, a line of text
is terminated by the first end-of-line character or by end-of-file.
If handle-delim is specified, it should be one of the following symbols:
Discard the terminating delimiter. This is the default, but it will be impossible to tell whether the read terminated with a delimiter or end-of-file.
Append the terminating delimiter (if any) to the returned string.
Push the terminating delimiter (if any) back on to the port.
Return a pair containing the string read from the port and the terminating delimiter or end-of-file object.
Read a line of text into the supplied string buf and return the
number of characters added to buf. If buf is filled, then
#f is returned. Read from port if specified, otherwise
from the value returned by
Read text until one of the characters in the string delims is
found or end-of-file is reached. Read from port if supplied,
otherwise from the value returned by
handle-delim takes the same values as described for
Read text into the supplied string buf.
If a delimiter was found, return the number of characters written,
except if handle-delim is
split, in which case the return
value is a pair, as noted above.
As a special case, if port was already at end-of-stream, the EOF
object is returned. Also, if no characters were written because the
buffer was full,
#f is returned.
It’s something of a wacky interface, to be honest.
Read characters from port into str until one of the
characters in the delims string is encountered. If
gobble is true, discard the delimiter character;
otherwise, leave it in the input stream for the next read. If
port is not specified, use the value of
(current-input-port). If start or end are
specified, store data only into the substring of str
bounded by start and end (which default to the
beginning and end of the string, respectively).
Return a pair consisting of the delimiter that terminated the
string and the number of characters read. If reading stopped
at the end of file, the delimiter returned is the
eof-object; if the string was filled without encountering
a delimiter, this value is
Read a newline-terminated line from port, allocating storage as
necessary. The newline terminator (if any) is removed from the string,
and a pair consisting of the line and its delimiter is returned. The
delimiter may be either a newline or the eof-object; if
%read-line is called at the end of file, it returns the pair
(#<eof> . #<eof>).