Commits on Oct 21, 2019

1. lib/trivial: add pipe function …

   `pipe` is a useful operator for creating pipelines of functions.
   
   It works around the usual problem of e.g. string operations becoming
   deeply nested functions.
   
   In principle, there are four different ways this function could be
   written:
   
   pipe val [ f1 .. fn ]
   pipe val [ fn .. f1 ]
   compose [ f1 .. fn ] val
   compose [ fn .. f1 ] val
   
   The third and fourth form mirror composition of functions, they would
   be the same as e.g. `(f1 << f2 << f3 .. << fn) val`.
   However, it is not clear which direction the list should have (as one
   can see in the second form, which is the most absurd.
   
   In order not to confuse users, we decide for the most “intuitive”
   form, which mirrors the way unix pipes work (thus the name `pipe`).
   The flow of data goes from left to right.
   
   Co-Authored-By: Silvan Mosberger <infinisil@icloud.com>

   

   Profpatsch and infinisil committed Oct 21, 2019
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