Refactor errors and update post draft.

code/compiler/13/main.cpp

@@ -20,7 +20,7 @@
 #include "llvm/Target/TargetMachine.h"
 
 void yy::parser::error(const yy::location& loc, const std::string& msg) {
-    std::cout << "An error occured: " << msg << std::endl;
+    std::cerr << "An error occured: " << msg << std::endl;
 }
 
 void prelude_types(definition_group& defs, type_env_ptr env) {
@@ -110,12 +110,12 @@ void output_llvm(llvm_context& ctx, const std::string& filename) {
         std::error_code ec;
         llvm::raw_fd_ostream file(filename, ec, llvm::sys::fs::F_None);
         if (ec) {
-            throw std::runtime_error("failed to open object file for writing");
+            throw compiler_error("failed to open object file for writing");
         } else {
             llvm::CodeGenFileType type = llvm::CGFT_ObjectFile;
             llvm::legacy::PassManager pm;
             if (targetMachine->addPassesToEmitFile(pm, file, NULL, type)) {
-                throw std::runtime_error("failed to add passes to pass manager");
+                throw compiler_error("failed to add passes to pass manager");
             } else {
                 pm.run(ctx.module);
                 file.close();
@@ -177,10 +177,11 @@ void gen_llvm(global_scope& scope) {
 int main(int argc, char** argv) {
     if(argc != 2) {
         std::cerr << "please enter a file to compile." << std::endl;
+        exit(1);
     }
     parse_driver driver(argv[1]);
     if(!driver.run_parse()) {
-        std::cerr << "failed to open file " << argv[1] << std::endl;
+        std::cerr << "failed to parse file " << argv[1] << std::endl;
         exit(1);
     }
 
@@ -207,7 +208,7 @@ int main(int argc, char** argv) {
         err.pretty_print(std::cerr, driver, mgr);
     } catch(type_error& err) {
         err.pretty_print(std::cerr, driver);
-    } catch(std::runtime_error& err) {
-        std::cerr << err.what() << std::endl;
+    } catch (compiler_error& err) {
+        err.pretty_print(std::cerr, driver);
     }
 }