Add a readline() command to d8. This reads a single line, stripping

the new-line at the end. This is the other half of what is required to
make the Debian Language Shootout code work correctly:
http://code.google.com/p/v8/issues/detail?id=353


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2671 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -167,9 +167,6 @@ Handle<Value> Shell::Write(const Arguments& args) {
 
 
 Handle<Value> Shell::Read(const Arguments& args) {
-  if (args.Length() != 1) {
-    return ThrowException(String::New("Bad parameters"));
-  }
   String::Utf8Value file(args[0]);
   if (*file == NULL) {
     return ThrowException(String::New("Error loading file"));
@@ -182,6 +179,19 @@ Handle<Value> Shell::Read(const Arguments& args) {
 }
 
 
+Handle<Value> Shell::ReadLine(const Arguments& args) {
+  char line_buf[256];
+  if (fgets(line_buf, sizeof(line_buf), stdin) == NULL) {
+    return ThrowException(String::New("Error reading line"));
+  }
+  int len = strlen(line_buf);
+  if (line_buf[len - 1] == '\n') {
+    --len;
+  }
+  return String::New(line_buf, len);
+}
+
+
 Handle<Value> Shell::Load(const Arguments& args) {
   for (int i = 0; i < args.Length(); i++) {
     HandleScope handle_scope;
@@ -404,6 +414,8 @@ void Shell::Initialize() {
   global_template->Set(String::New("print"), FunctionTemplate::New(Print));
   global_template->Set(String::New("write"), FunctionTemplate::New(Write));
   global_template->Set(String::New("read"), FunctionTemplate::New(Read));
+  global_template->Set(String::New("readline"),
+                       FunctionTemplate::New(ReadLine));
   global_template->Set(String::New("load"), FunctionTemplate::New(Load));
   global_template->Set(String::New("quit"), FunctionTemplate::New(Quit));
   global_template->Set(String::New("version"), FunctionTemplate::New(Version));
@@ -596,6 +608,8 @@ void ShellThread::Run() {
                        FunctionTemplate::New(Shell::Write));
   global_template->Set(String::New("read"),
                        FunctionTemplate::New(Shell::Read));
+  global_template->Set(String::New("readline"),
+                       FunctionTemplate::New(Shell::ReadLine));
   global_template->Set(String::New("load"),
                        FunctionTemplate::New(Shell::Load));
   global_template->Set(String::New("yield"),

src/d8.h

@@ -143,6 +143,7 @@ class Shell: public i::AllStatic {
   static Handle<Value> Quit(const Arguments& args);
   static Handle<Value> Version(const Arguments& args);
   static Handle<Value> Read(const Arguments& args);
+  static Handle<Value> ReadLine(const Arguments& args);
   static Handle<Value> Load(const Arguments& args);
   // The OS object on the global object contains methods for performing
   // operating system calls: