implement get_line & get_raw_line for windows + REPL

compiler/main.v

@@ -937,10 +937,6 @@ fn new_v(args[]string) *V {
 }
 
 fn run_repl() []string {
-	$if windows {
-		println('REPL does not work on Windows yet, sorry!') 
-		exit(1) 
-	} 
 	println('V $Version')
 	println('Use Ctrl-D or `exit` to exit')
 	println('For now you have to use println() to print values, this will be fixed soon\n')

vlib/os/os.v

@@ -405,34 +405,39 @@ pub fn filename(path string) string {
 }
 
 // get_line returns a one-line string from stdin 
-//u64 is used because C.getline needs a size_t as second argument
-//Otherwise, it would cause a valgrind warning and may be dangerous
-//Malloc takes an int as argument so a cast has to be made
 pub fn get_line() string {
-	$if windows {
-		panic('get_line() not implemented on Windows yet, sorry!') 
-	} 
-	$else { 
-		max := u64(256)
-		buf := malloc(int(max))
-		nr_chars := C.getline(&buf, &max, stdin)
-		if nr_chars == 0 {
-			return ''
-		}
-		if buf[nr_chars - 1] == `\n` { // newline  
-			return tos(buf, nr_chars - 1)
-		}
-		// To prevent cutting end of line if no newline  
-		return tos(buf, nr_chars)
+    str := get_raw_line()
+    if str[str.len - 1] == `\n` {
+        return str.substr(0, str.len - 1)
     }
+
+    return str
 }
 
+const(
+	STD_INPUT_HANDLE = -10
+)
+
 // get_raw_line returns a one-line string from stdin along with '\n' if there is any
 pub fn get_raw_line() string {
 	$if windows {
-		panic('get_raw_line() not implemented on Windows yet, sorry!') 
+		max := 256
+		buf := malloc(max)
+		// TODO: Use HANDLE instead of voidptr
+		h_input := voidptr(C.GetStdHandle(STD_INPUT_HANDLE))
+		nr_chars := 0
+		// NOTE: Once we have UTF8 encode function to
+		// convert utf16 to utf8, change to ReadConsoleW
+		C.ReadConsole(h_input, buf, max, &nr_chars, 0)
+		if nr_chars == 0 {
+			return ''
+		}
+		return tos(buf, nr_chars)
 	}
 	$else {
+		//u64 is used because C.getline needs a size_t as second argument
+		//Otherwise, it would cause a valgrind warning and may be dangerous
+		//Malloc takes an int as argument so a cast has to be made
 		max := u64(256)
 		buf := malloc(int(max))
 		nr_chars := C.getline(&buf, &max, stdin)