Merge pull request #130 from andgrew/master

add c variant for old str formatting

Author: alanjds

grumpy-runtime-src/runtime/str.go

@@ -1181,6 +1181,13 @@ func strMod(f *Frame, v, args *Object) (*Object, *BaseException) {
 				val = strLeftPad(val, fieldWidth, fillchar)
 			}
 			buf.WriteString(val)
+		case "c":
+			if value.isInstance(IntType) {
+				val = string(toIntUnsafe(value).Value())
+			} else {
+				val = toStrUnsafe(value).Value()
+			}
+			buf.WriteString(val)
 		case "%":
 			val = "%"
 			if fieldWidth > 0 {

grumpy-runtime-src/testing/str_test.py

@@ -369,3 +369,6 @@ def __int__(self):
 assert '%o' % 8 == '10'
 assert '%o' % -8 == '-10'
 assert '%o %o' % (8, -8) == '10 -10'
+
+assert '%c' % 107 == 'k'
+assert '%c' % 'k' == 'k'