[gfxmonk]

Cool :), glad it's supported, at least for the simple case of line-wise transforms.

Some things can't be done without reading everything. But there are still a number of operations on "all of stdin" that can safely be done lazily. I'm particularly fond of "divide stdin into chunks of lines separated by <predicate>" [0]. Which does need context, but only enough to determine where the current chunk ends (typically a few lines).

`py` seems to be aimed at a single expression per invocation (nice and simple), while `piep` recreates pipelines internally (more complex but also means pipelines can produce arbitrary objects rather than single-line strings). So I'm not really sure how you'd do the above in `py` anyway.

[0] http://gfxmonk.net/dist/doc/piep/#piep.list.BaseList.divide