I’ve come across a problem posted on #bsdports channel few days ago, how to download a port (FreeBSD) and its dependencies without checking out complete ports tree. So, I hacked a solution for this in Haskell to celebrate my recently attained bliss moment:

λ ghci
GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> :load download-portstree.hs
[1 of 1] Compiling Main             ( download-portstree.hs, interpreted )
Ok, modules loaded: Main.
*Main> downloadPortsTree "editors/emacs-nox11"
Loading package transformers-0.3.0.0 ... linking ... done.
Loading package mtl-2.1.2 ... linking ... done.
Loading package array-0.4.0.1 ... linking ... done.
Loading package deepseq-1.3.0.1 ... linking ... done.
Loading package containers-0.5.0.0 ... linking ... done.
Loading package bytestring-0.10.0.2 ... linking ... done.
Loading package old-locale-1.0.0.5 ... linking ... done.
Loading package time-1.4.0.1 ... linking ... done.
Loading package unix-2.6.0.1 ... linking ... done.
Loading package filepath-1.3.0.1 ... linking ... done.
Loading package directory-1.2.0.1 ... linking ... done.
Loading package process-1.1.0.2 ... linking ... done.
PortsList {portsSeen = fromList ["converters/libiconv","devel/gettext","devel/gmake","devel/libffi","devel/ncurses","devel/pkgconf","editors/emacs-nox11","lang/perl5.16","math/gmp","print/indexinfo","security/ca_root_nss","security/gnutls","security/libgpg-error","security/libtasn1","security/nettle","security/openssl","security/p11-kit","textproc/libxml2"], portsNew = fromList []}
Checking out port editors/emacs-nox11
Checking out port devel/gmake
Checking out port converters/libiconv
Checking out port devel/gettext
Checking out port devel/ncurses
Checking out port devel/pkgconf
Checking out port print/indexinfo
Checking out port security/gnutls
Checking out port lang/perl5.16
Checking out port security/libgpg-error
Checking out port security/libtasn1
Checking out port security/nettle
Checking out port math/gmp
Checking out port security/openssl
Checking out port security/p11-kit
Checking out port devel/libffi
Checking out port security/ca_root_nss
Checking out port textproc/libxml2

Happy hacking lambdas… 😉