Merge pull request #58 from makerdao/managed_gem_join

Add managed GemJoin abstract

src/Interfaces.sol

@@ -36,6 +36,8 @@ import { FlipAbstract } from "./dss/FlipAbstract.sol";
 import { FlipperMomAbstract } from "./dss/FlipperMomAbstract.sol";
 import { FlopAbstract } from "./dss/FlopAbstract.sol";
 import { GemJoinAbstract } from "./dss/GemJoinAbstract.sol";
+import { GemJoinImplementationAbstract } from "./dss/GemJoinImplementationAbstract.sol";
+import { GemJoinManagedAbstract } from "./dss/GemJoinManagedAbstract.sol";
 import { GetCdpsAbstract } from "./dss/GetCdpsAbstract.sol";
 import { IlkRegistryAbstract } from "./dss/IlkRegistryAbstract.sol";
 import { JugAbstract } from "./dss/JugAbstract.sol";

src/dss/GemJoinManagedAbstract.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity >=0.5.12;
+
+// https://github.com/makerdao/dss-gem-joins/blob/master/src/join-managed.sol
+interface GemJoinManagedAbstract {
+    function wards(address) external view returns (uint256);
+    function rely(address) external;
+    function deny(address) external;
+    function vat() external view returns (address);
+    function ilk() external view returns (bytes32);
+    function gem() external view returns (address);
+    function dec() external view returns (uint256);
+    function live() external view returns (uint256);
+    function cage() external;
+    function join(address, uint256) external;
+    function exit(address, address, uint256) external;
+}

src/dss/PotHelper.sol

@@ -8,8 +8,8 @@ contract PotHelper {
 
     PotAbstract pa;
 
-    constructor(address pot) public {
-        pa = PotAbstract(pot);
+    constructor(address _pot) public {
+        pa = PotAbstract(_pot);
     }
 
     // https://github.com/makerdao/dss/blob/master/src/pot.sol#L79