update REAME.

Builds with stack. It is a lot less hasstle now.

diff --git a/README.md b/README.md
index 61001971eae1fd0818a427a1b13f886c04466b17..0017f5a9ff18cccf423618bd4d962bbdf0fdcb09 100644 (file)
--- a/README.md
+++ b/README.md
@@ -6,19 +6,18 @@
 
 ## Building
 
-Functorrent can be build with [Cabal](https://www.haskell.org/cabal/) sandbox or
+Functorrent can be build with [Stack](https://github.com/commercialhaskell/stack) or
 [Nix](https://nixos.org/nix/).
 
-### Cabal sandbox
+### Stack
 
 Sandboxes give you per project independent containers, just like Python's
 virtualenv.
 
 
     $ git clone https://github.com/vu3rdd/functorrent && cd functorrent
-    $ cabal sandbox init
-    $ cabal install --only-dependencies --enable-tests
-    $ cabal build # binaries in ./dist/built/functorrent/*
+    $ cabal install stack # or install stack by other means
+    $ stack build # binaries in $(pwd)/.stack-work/install/x86..../lts-2.16/7.8.4/bin/functorrent
 
 ### Building with Nix
 
@@ -30,6 +29,19 @@ shell which has all the package dependencies installed.
     [...]
     [nix-shell] $ cabal configure && cabal build
 
+### Usage
+
+If you invoke functorrent without any options, it expects the contents of a torrent file
+to be given in stdin. So
+
+$ cat ubuntu-14.10-desktop-amd64.iso.torrent | functorrent
+[....]
+
+Or one can explicitly specify the torrent file as input.
+
+$ functorrent ubuntu-14.10-desktop-amd64.iso.torrent
+[...]
+
 ## Goals
 
 - [Optimized for Fun](http://www.slideshare.net/autang/ofun-optimizing-for-fun).
@@ -38,7 +50,7 @@ shell which has all the package dependencies installed.
 - Implement something non-trivial with Haskell (crypto, file operations, network
   operations, concurrency, bit twiddling, DHT).
 - Follow the spec ([official spec](http://bittorrent.org/beps/bep_0003.html), [unofficial spec](https://wiki.theory.org/BitTorrentSpecification))
-- Easy for newbies like me to read and understand along side the spec.
+- Easy for newbies like me to read and understand alongside the spec.
 - doctest and quickcheck tests.
 - Follow Haskell Style Guide - https://github.com/tibbe/haskell-style-guide/blob/master/haskell-style.md