Initial commit

This is a service designed to provide information about Guix. At the
moment, this initial prototype gathers up information about packages,
the associated metadata and derivations.

The initial primary use case is to compare two different revisions of
Guix, detecting which packages are new, no longer present, updated or
otherwise different.

It's based on the Mumi project.

[1]: https://git.elephly.net/software/mumi.git

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diff --git a/guix-data-service/web/util.scm b/guix-data-service/web/util.scm
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+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2016, 2017  Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2014  David Thompson <davet@gnu.org>
+;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU Affero General Public License
+;;; as published by the Free Software Foundation, either version 3 of
+;;; the License, or (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(define-module (guix-data-service web util)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (web request)
+  #:use-module (web uri)
+  #:export (parse-query-string
+            request-path-components
+            file-extension
+            directory?))
+
+(define (parse-query-string query)
+  "Parse and decode the URI query string QUERY and return an alist."
+  (let lp ((lst (map uri-decode (string-split query (char-set #\& #\=)))))
+    (match lst
+      ((key value . rest)
+       (cons (cons key value) (lp rest)))
+      (() '()))))
+
+(define (request-path-components request)
+  (split-and-decode-uri-path (uri-path (request-uri request))))
+
+(define (file-extension file-name)
+  (last (string-split file-name #\.)))
+
+(define (directory? filename)
+  (string=? filename (dirname filename)))