contrib/nitrpg: add some basic reactors

Here the reactors are used to collect new pull request and comments to reward the player with nitcoins.

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/contrib/nitrpg/src/reactors.nit b/contrib/nitrpg/src/reactors.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2014-2015 Alexandre Terrasa <alexandre@moz-code.org>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Various implementations of `GameReactor` can be found here.
+#
+# TODO This module use a lot of magic numbers for nitcoin rewards.
+# This should be extracted from configuration or stored elsewhere.
+module reactors
+
+import game
+
+# Reacts to event that can affect players (like giving nitcoins).
+class PlayerReactor
+       super GameReactor
+
+       redef fun react_event(game, e) do e.react_player_event(game)
+end
+
+redef class GithubEvent
+       # Reacts to a player related event.
+       #
+       # Called by `PlayerReactor::react_event`.
+       # No-op by default.
+       private fun react_player_event(game: Game) do end
+end
+
+redef class PullRequestEvent
+
+       # Rewards player for opened pull requests.
+       redef fun react_player_event(game) do
+               if action == "opened" then
+                       var player = pull.user.player(game)
+                       player.nitcoins += 10
+                       player.save
+               end
+       end
+end
+
+redef class IssueCommentEvent
+
+       # Rewards player for review comments.
+       #
+       # Actuallty we look if the comment contains the string `"+1"`.
+       #
+       # TODO only give nitcoins if reviewers < 2
+       redef fun react_player_event(game) do
+               # FIXME use a more precise way to locate reviews
+               if comment.body.has("\\+1\\b".to_re) then
+                       var player = comment.user.player(game)
+                       player.nitcoins += 2
+                       player.save
+               end
+       end
+end