Add read() to Filehandle

src/main/java/dan200/computercraft/core/apis/handles/EncodedInputHandle.java

@@ -6,6 +6,8 @@ import dan200.computercraft.api.lua.LuaException;
 import javax.annotation.Nonnull;
 import java.io.*;
 
+import static dan200.computercraft.core.apis.ArgumentHelper.*;
+
 public class EncodedInputHandle extends HandleGeneric
 {
     private final BufferedReader m_reader;
@@ -49,6 +51,7 @@ public class EncodedInputHandle extends HandleGeneric
             "readLine",
             "readAll",
             "close",
+            "read",
         };
     }
 
@@ -102,6 +105,32 @@ public class EncodedInputHandle extends HandleGeneric
                 // close
                 close();
                 return null;
+            case 3:
+                // read
+                checkOpen();
+                try
+                {
+                    double count = optNumber( args, 0, 1 );
+                    StringBuilder result = new StringBuilder( "" );
+                    for ( int i = 1; i < count+1; i++ ) {
+                        int character = m_reader.read();
+                        if ( character == -1 ) {
+                            if ( result.length() == 0 ) {
+                                return null;
+                            }
+                            else {
+                                return new Object[] { result.toString() };
+                            }
+                        }
+                        char c = (char) character;
+                        result.append( c );
+                    }
+                    return new Object[] { result.toString() };
+                }
+                catch( IOException e )
+                {
+                    return null;
+                }
             default:
                 return null;
         }

src/main/resources/assets/computercraft/lua/rom/apis/io.lua

@@ -91,6 +91,8 @@ function open( _sPath, _sMode )
 					return file.readLine()
 				elseif sFormat == "*a" then
 					return file.readAll()
+                elseif _G.type( sFormat ) == "number" then
+                    return file.read( sFormat )
 				else
 					error( "Unsupported format" )
 				end