Rework demo binary

Author: jeremy-rifkin

test/demo.cpp

@@ -1,20 +1,18 @@
 #include <cpptrace/cpptrace.hpp>
-#include <cpptrace/version.hpp>
+#include <cpptrace/from_current.hpp>
 
 #include <algorithm>
 #include <cctype>
 #include <iostream>
 #include <string>
 
-void trace() {
-    cpptrace::generate_trace().print();
-    cpptrace::generate_trace().print_with_snippets();
-    throw cpptrace::logic_error("foobar");
+void fail() {
+    throw std::runtime_error("foobar");
 }
 
 void foo(int n) {
     if(n == 0) {
-        trace();
+        fail();
     } else {
         foo(n - 1);
     }
@@ -37,5 +35,10 @@ int main() {
     cpptrace::absorb_trace_exceptions(false);
     cpptrace::use_default_stderr_logger();
     cpptrace::register_terminate_handler();
-    function_one(0);
+    CPPTRACE_TRY {
+        function_one(0);
+    } CPPTRACE_CATCH(const std::exception& e) {
+        std::cout << "Exception caught: " << e.what() << std::endl;
+        cpptrace::from_current_exception().print();
+    }
 }