char mins done; need to shuffle some error condition checks before

pwgenerator/types.go

@@ -1,5 +1,8 @@
 package pwgenerator
 
+// cryptoShuffler is used to shuffle a slice in a cryptographically sane way.
+type cryptoShuffler struct{}
+
 // Char is implemented as a rune.
 type Char rune
 
@@ -32,6 +35,8 @@ type GenOpts struct {
 	CountUpper uint `json:"uppers"`
 	// CountLower specifies how many lowercase letters (0x61 to 0x7a) should be specified at a minimum.
 	CountLower uint `json:"lowers"`
+	// CountNumbers specifies how many numbers (0x30 to 0x39) should be specified at a minimum.
+	CountNumbers uint `json:"numbers"`
 	// CountSymbols specifies how many symbols (0x21 to 0x7e) should be specified at a minimum.
 	CountSymbols uint `json:"symbols"`
 	// CountExtended specifies how many extended symbols (0x80 to 0xff) should be specified at a minimum.
@@ -50,3 +55,12 @@ type GenOpts struct {
 	// explicitCharset is the collection of acceptable characters as explicitly defined by the caller, if any.
 	explicitCharset CharSet
 }
+
+// selectFilter is used to include specified number of characters.
+type selectFilter struct {
+	upperCounter    uint
+	lowerCounter    uint
+	numberCounter   uint
+	symbolCounter   uint
+	extendedCounter uint
+}