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  1. +9 −0 .gitignore
  2. +1 −0 AUTHORS
  3. +214 −0 LICENSE
  4. +14 −0 README.md
  5. +3 −0 doc/intro.md
  6. +6 −0 project.clj
  7. +77 −0 src/hood/core.clj
  8. +9 −0 test/hood/core_test.clj
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+/target
+/classes
+/checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port
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+Laurens Van Houtven <_@lvh.io>
214 LICENSE
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+THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
+LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM
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+# hood
+
+A Clojure library
+
+## Usage
+
+FIXME
+
+## License
+
+Copyright © 2014 the authors (see AUTHORS)
+
+Distributed under the Eclipse Public License either version 1.0 or (at
+your option) any later version.
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+# Introduction to hood
+
+TODO: write [great documentation](http://jacobian.org/writing/great-documentation/what-to-write/)
@@ -0,0 +1,6 @@
+(defproject hood "0.1.0-SNAPSHOT"
+ :description "FIXME: write description"
+ :url "http://example.com/FIXME"
+ :license {:name "Eclipse Public License"
+ :url "http://www.eclipse.org/legal/epl-v10.html"}
+ :dependencies [[org.clojure/clojure "1.5.1"]])
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+(ns hood.core
+ (:require [clojure.set :refer [difference]]))
+
+(def score-funcs
+ [[5 (fn [a] (if (:student a) 1 0))]])
+
+(defn score*
+ "Computes the score of an allocation."
+ [a]
+ (reduce (fn [acc [w f]]
+ (+ acc (* w (f a))))
+ 0 score-funcs))
+
+(def score (memoize score))
+
+(defn one-pass-alloc
+ "Allocates funds to all people that are requesting less than their
+ slice of the budget. Returns a map of applications to allocations.
+
+ This should be called with the applications that still need to be
+ allocated funds.
+
+ "
+ [applications budget accept-less]
+ (let [total-score (apply + (map score applications))
+ budget-slice (/ budget total-score)
+ offer (fn [app]
+ (min
+ (:requested-grant app)
+ (* (score app) budget-slice)))]
+ (reduce (fn [allocs app]
+ (if (or accept-less (== (:requested-grant app) (offer app)))
+ (assoc allocs app (offer app))
+ allocs))
+ {} applications)))
+
+(defn iter-alloc
+ "Does one-pass allocs until they don't work no more.
+
+ This has to be done iteratively (with a static budget per pass) in
+ order to guarantee consistent results. Otherwise, suppose that you
+ have two applications x1, x2 that request significantly fewer funds
+ than their score would allow, and two applications y1, y2 that both
+ request (perhaps only slightly) more. If we adjust the budget during
+ processing, it's possible that in this processing order:
+
+ y1 x1 x2 y2
+
+ y1 doesn't get the increased grant but y2 does; because it happened
+ to be processed after more funds became available in the budget.
+
+ "
+ [apps budget]
+ (loop [rem-apps (set apps)
+ rem-budget budget
+ allocs #{}]
+ (let [new-allocs (one-pass-alloc rem-apps rem-budget false)]
+ (if (empty? new-allocs)
+ [allocs rem-apps rem-budget]
+ (recur [(difference rem-apps (set (keys new-allocs)))
+ (- budget (apply + (values new-allocs)))
+ (into allocs new-allocs)])))))
+
+(defn needs-alloc?
+ [app]
+ (contains? #{:reviewed :requesting-more} (:state application)))
+
+(defn alloc
+ "Allocates funds.
+
+ First does iter-alloc, then best-effort on the remaining ones.
+ "
+ [applications budget]
+ (let [pool (set (filter needs-allocation? applications))
+ [allocs rem-apps rem-budget] (iter-alloc pool budget)
+ best-effort-allocs (one-pass-alloc rem-apps rem-budget true)]
+ (into allocs best-effort-allocs)))
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+(ns hood.core-test
+ (:require [clojure.test :refer :all]
+ [hood.core :refer :all]))
+
+(deftest score-test
+ (testing "scores don't fail on empty apps"
+ (is (= (score* {}) 0)))
+ (testing "a student"
+ (is (= (score* {:student :true}) 5))))

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