fix unicode input

src/justify.cpp

@@ -28,6 +28,7 @@
 #include <sys/ioctl.h>
 #include <unistd.h>
 
+#include <cstdlib>
 #include <filesystem>
 #include <fstream>
 #include <iostream>
@@ -370,6 +371,12 @@ bool justify(const Settings& settings)
 
 int main(int argc, char* argv[])
 {
+
+    // Set locale to make unicode input work properly.
+    const char* langEnv = std::getenv("LANG");
+    const std::string sysLocale{langEnv ? langEnv : "en_US.utf8"};
+    std::locale::global(std::locale(sysLocale));
+
     std::vector<std::string> arguments(argv, argv + argc);
     Settings settings  = parseArgs(arguments);
     if (settings.error) return 1;