To install this package, run in Emacs:
M-x package-install RET stream RET
This library provides an implementation of streams. Streams are implemented as delayed evaluation of cons cells. Functions defined in `seq.el' can also take a stream as input. streams could be created from any sequential input data: - sequences, making operation on them lazy - a set of 2 forms (first and rest), making it easy to represent infinite sequences - buffers (by character) - buffers (by line) - buffers (by page) - IO streams - orgmode table cells - ... All functions are prefixed with "stream-". All functions are tested in tests/stream-tests.el Here is an example implementation of the Fibonacci numbers implemented as in infinite stream: (defun fib (a b) (stream-cons a (fib b (+ a b)))) (fib 0 1) A note for developers: Please make sure to implement functions that process streams (build new streams out of given streams) in a way that no new elements in any argument stream are generated. This is most likely an error since it changes the argument stream. For example, a common error is to call `stream-empty-p' on an input stream and build the stream to return depending on the result. Instead, delay such tests until elements are requested from the resulting stream. A way to achieve this is to wrap such tests into `stream-make' or `stream-delay'. See the implementations of `stream-append' or `seq-drop-while' for example.