Oh yeah, i promised in the help to use the terminal width by default didnt i

src/justify.cpp

@@ -24,6 +24,9 @@
 #include "justifyRight.h"
 #include "stringHelper.h"
 
+#include <sys/ioctl.h>
+#include <unistd.h>
+
 #include <filesystem>
 #include <fstream>
 #include <iostream>
@@ -31,7 +34,6 @@
 #include <string>
 #include <vector>
 
-
 void usage(const std::string& program)
 {
     std::cout << "justify - simple text alignment tool." << std::endl;
@@ -232,9 +234,17 @@ bool justify(const Settings& settings)
 int main(int argc, char* argv[])
 {
     std::vector<std::string> arguments(argv, argv + argc);
-    Settings settings = parseArgs(arguments);
+    Settings settings  = parseArgs(arguments);
     if (settings.error) return 1;
     if (settings.shouldExit) return 0;
+    if (settings.cols == 0)
+    {
+        // Get terminal width (to use as a default)
+        /// @TODO make sure this works on most unixes
+        winsize termSize;
+        ioctl(STDOUT_FILENO, TIOCGWINSZ, &termSize);
+        settings.cols = termSize.ws_col;
+    }
     return justify(settings) == true ? 0 : 1;
 }
 

src/justify.h

@@ -27,7 +27,7 @@ enum class Justification { CENTER, FILL, LEFT, RIGHT };
 
 struct Settings
 {
-    size_t cols{80};
+    size_t cols{};
     bool error{false};
     bool shouldExit{false};
     std::string inFile;