hy/eg/debian/parse-rfc822.hy

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#!/usr/bin/env hy
; Copyright (c) Paul R. Tagliamonte <paultag@debian.org>, 2013 under the terms
; of the Expat license, a copy of which you have should have recieved with
; the source.
(import sys)
(defn parse-rfc822-file [path]
"Parse an RFC822 file"
(with-as (open path "r") fd
(parse-rfc822-stream fd)))
(defn parse-rfc822-stream [fd]
"Parse an RFC822 stream"
(setv bits {})
(setv key null)
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(for [line fd]
(if (in ":" line)
(do (setv line (.split line ":" 1))
(setv key (.strip (get line 0)))
(setv val (.strip (get line 1)))
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(assoc bits key val))
(do
(if (= (.strip line) ".")
(assoc bits key (+ (get bits key) "\n"))
(assoc bits key (+ (get bits key) "\n" (.strip line)))))))
bits)
(setv block (parse-rfc822-file (get sys.argv 1)))
(setv source (get block "Source"))
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(print source "is a(n)" (get block "Description"))
(import-from sh apt-cache)
(setv archive-block (parse-rfc822-stream (.show apt-cache source)))
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(print "The archive has version" (get archive-block "Version") "of" source)