add bool support (vapor#33)

* add bool support

* update readme

Author: tanner0101

README.md

@@ -196,6 +196,8 @@ print(data.uint16) // UInt16?
 print(data.uint32) // UInt32?
 print(data.uint64) // UInt64?
 
+print(data.bool) // Bool?
+
 print(data.float) // Float?
 print(data.double) // Double?
 
@@ -205,4 +207,4 @@ print(data.uuid) // UUID?
 print(data.numeric) // PostgresNumeric?
 ```
 
-`PostgresData` is also used for sending data _to_ the server via parameterized values. To create `PostgresData` from a Swift type, use the available intializer methods. 
+`PostgresData` is also used for sending data _to_ the server via parameterized values. To create `PostgresData` from a Swift type, use the available intializer methods. 

Sources/CMD5/cmd5.c renamed to Sources/CMD5/CMD5.c

@@ -37,7 +37,7 @@
 
 #include <string.h>
 
-#include "cmd5.h"
+#include "CMD5.h"
 
 /*
  * The basic MD5 functions.

Sources/CMD5/include/cmd5.h renamed to Sources/CMD5/include/CMD5.h

@@ -0,0 +1,63 @@
+extension PostgresData {
+    public init(bool: Bool) {
+        var buffer = ByteBufferAllocator().buffer(capacity: 1)
+        buffer.writeInteger(bool ? 1 : 0, as: UInt8.self)
+        self.init(type: .bool, formatCode: .binary, value: buffer)
+    }
+    
+    public var bool: Bool? {
+        guard var value = self.value else {
+            return nil
+        }
+        guard value.readableBytes == 1 else {
+            return nil
+        }
+        guard let byte = value.readInteger(as: UInt8.self) else {
+            return nil
+        }
+        
+        switch self.formatCode {
+        case .text:
+            switch byte {
+            case Character("t").asciiValue!:
+                return true
+            case Character("f").asciiValue!:
+                return false
+            default:
+                return nil
+            }
+        case .binary:
+            switch byte {
+            case 1:
+                return true
+            case 0:
+                return false
+            default:
+                return nil
+            }
+        }
+    }
+}
+
+extension PostgresData: ExpressibleByBooleanLiteral {
+    public init(booleanLiteral value: Bool) {
+        self.init(bool: value)
+    }
+}
+
+extension Bool: PostgresDataConvertible {
+    public static var postgresDataType: PostgresDataType {
+        return .bool
+    }
+    
+    public var postgresData: PostgresData? {
+        return .init(bool: self)
+    }
+    
+    public init?(postgresData: PostgresData) {
+        guard let bool = postgresData.bool else {
+            return nil
+        }
+        self = bool
+    }
+}

Sources/PostgresNIO/Data/PostgresData+Bool.swift

@@ -366,6 +366,27 @@ final class NIOPostgresTests: XCTestCase {
         XCTAssertEqual(rows[0].column("array")?.array(of: Int.self), [])
     }
 
+    func testBoolSerialize() throws {
+        let conn = try PostgresConnection.test(on: eventLoop).wait()
+        defer { try! conn.close().wait() }
+        do {
+            let rows = try conn.query("select $1::bool as bool", [true]).wait()
+            XCTAssertEqual(rows[0].column("bool")?.bool, true)
+        }
+        do {
+            let rows = try conn.query("select $1::bool as bool", [false]).wait()
+            XCTAssertEqual(rows[0].column("bool")?.bool, false)
+        }
+        do {
+            let rows = try conn.simpleQuery("select true::bool as bool").wait()
+            XCTAssertEqual(rows[0].column("bool")?.bool, true)
+        }
+        do {
+            let rows = try conn.simpleQuery("select false::bool as bool").wait()
+            XCTAssertEqual(rows[0].column("bool")?.bool, false)
+        }
+    }
+    
     func testRemoteTLSServer() throws {
         let url = "postgres://uymgphwj:7_tHbREdRwkqAdu4KoIS7hQnNxr8J1LA@elmer.db.elephantsql.com:5432/uymgphwj"
         let elg = MultiThreadedEventLoopGroup(numberOfThreads: 1)

Tests/PostgresNIOTests/NIOPostgresTests.swift

@@ -8,6 +8,7 @@ extension NIOPostgresTests {
     static let __allTests__NIOPostgresTests = [
         ("testAverageLengthNumeric", testAverageLengthNumeric),
         ("testBindInteger", testBindInteger),
+        ("testBoolSerialize", testBoolSerialize),
         ("testColumnsInJoin", testColumnsInJoin),
         ("testConnectAndClose", testConnectAndClose),
         ("testDates", testDates),