choo: open source hoon sources (#8)

choo/README.md

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+# Choo: compile hoon
+
+To self-bootstrap:
+
+```
+$ cargo build
+$ ../target/debug/choo --new --knob hoon/lib/hoon-139.hoon
+$ mv out.jam hoon-139.jam
+$ ../target/debug/choo --new hoon/lib/kernel.hoon hoon-139.jam
+$ mv out.jam bootstrap/choo.jam
+$ cargo build
+```
+
+You now have a choo executable whose nock was built entirely by choo from Hoon sources.

choo/hoon/lib/builder.hoon

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+/*  hoon-139-hoon  %hoon  /lib/hoon-139/hoon
+/*  kernel-hoon  %hoon  /lib/kernel/hoon
+!.
+::  
+::  Bootstrap builder: to build the bootstrap formula for Choo using
+::  Urbit Ford
+::
+::  sync files into a desk %choo
+::  dojo> =choo -build-file /=choo=/lib/builder/hoon
+::  dojo> .choo/jam choo
+::
+::  copy <your-fakezod>/.urb/put/choo.jam to choo/bootstrap/choo.jam
+^-  nock
+~&  "compiling hoon"
+=/  hoon-knob=[t=type form=nock]
+  ~>  %bout
+  (~(mint ut %noun) %noun (ream hoon-139-hoon))
+~&  "compiling kernel"
+=/  kernel-knob=[t=type form=nock]
+  ~>  %bout
+  (~(mint ut t.hoon-knob) %noun (rain /lib/choo/kernel/hoon kernel-hoon))
+[%7 form.hoon-knob form.kernel-knob]