1 files changed, 19 insertions, 2 deletions

diff --git a/justify.cc b/justify.cc
index 73a3a3b..b20496c 100644
--- a/justify.cc
+++ b/justify.cc
@@ -1,15 +1,32 @@
+#include <string>
 #include <iostream>
 
 #include "line_accumulator.h"
 
-int main() {
+int main(int argc, char* argv[]) {
 	std::cout.sync_with_stdio(false);
 	std::cin.sync_with_stdio(false);
 
-	justify::LineAccumulator acc{60};
+	std::uint8_t max_line_length = 60;
+
+	if ( argc == 2 ) {
+		const int user_length = std::stoi(argv[1]);
+
+		if ( user_length > 1 && user_length < 256 ) {
+			max_line_length = user_length;
+		} else {
+			std::cerr << "Invalid line length.\n";
+
+			return -1;
+		}
+	}
+
+	justify::LineAccumulator acc{max_line_length};
 	std::string              token;
 
 	while ( std::cin >> token ) {
 		acc(token);
 	}
+
+	return 0;
 }