I think I could have most of the oneliner goodness of h4sh, without having to do
the module install, if I could figure out a way to include modules with ghc -e.
i confess myself to be among those who underappreciated ghc -e, until this
thread:)
as Joachim said (thanks for starting this, btw;-), we can use qualified names
$ echo hello world | hmap 'map Char.toUpper'
HELLO WORLD
and to get at your other methods, the question is not how to include modules
with ghc -e; instead, recall that ghc -e supplies a command to be evaluated
within the context of its parameter module (single input for a ghci session):
$ cat Imports.hs
import Debug.Trace
helper x = trace "hi there" (x+1)
$ ghc -e 'helper 41' Imports.hs
hi there
42
as to the original question in this thread, my .bashrc now also has a few less
symmetric entries:
function hrunl { ghc -e "interact(show.($*).lines)"; }
function hrunw { ghc -e "interact(show.($*).words)"; }
function hrunwl { ghc -e "interact(show.($*).map words.lines)"; }
using which the one-liner becomes something like
find -maxdepth 1 -type f | xargs du | hrunwl "sum . map (read . head)"
(the find/du is better left in shell tool land, it seems, and default Num is
Integer)
hth,
claus
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