Add a proper build system

FossilOrigin-Name: 8679c61b2c82da9daa316ed5eb90ba1b69e608127afa318cbdbff56b53d65a74

src/exceptions/PGCommandFailedException.m

@@ -0,0 +1,43 @@
+#import "PGCommandFailedException.h"
+
+@implementation PGCommandFailedException
++ (instancetype)exceptionWithConnection: (PGConnection*)connection
+				command: (OFString*)command
+{
+	return [[[self alloc] initWithConnection: connection
+					 command: command] autorelease];
+}
+
+- initWithConnection: (PGConnection*)connection
+	     command: (OFString*)command
+{
+	self = [super initWithConnection: connection];
+
+	@try {
+		_command = [command copy];
+	} @catch (id e) {
+		[self release];
+		@throw e;
+	}
+
+	return self;
+}
+
+- (void)dealloc
+{
+	[_command release];
+
+	[super dealloc];
+}
+
+- (OFString*)description
+{
+	return [OFString stringWithFormat: @"A PostgreSQL command failed: %@\n"
+					   @"Command: %@", _error, _command];
+}
+
+- (OFString*)command
+{
+	OF_GETTER(_command, NO)
+}
+@end