adding support for prefix matching against aliases & names

cobra_test.go

@@ -208,6 +208,34 @@ func TestCommandAlias(t *testing.T) {
 	}
 }
 
+func TestPrefixMatching(t *testing.T) {
+	noRRSetupTest("ech times one two")
+
+	if te != nil || tp != nil {
+		t.Error("Wrong command called")
+	}
+	if tt == nil {
+		t.Error("Wrong command called")
+	}
+	if strings.Join(tt, " ") != "one two" {
+		t.Error("Command didn't parse correctly")
+	}
+}
+
+func TestAliasPrefixMatching(t *testing.T) {
+	noRRSetupTest("sa times one two")
+
+	if te != nil || tp != nil {
+		t.Error("Wrong command called")
+	}
+	if tt == nil {
+		t.Error("Wrong command called")
+	}
+	if strings.Join(tt, " ") != "one two" {
+		t.Error("Command didn't parse correctly")
+	}
+}
+
 func TestChildSameName(t *testing.T) {
 	c := initializeWithSameName()
 	c.AddCommand(cmdPrint, cmdEcho)

command.go

@@ -286,11 +286,26 @@ func (c *Command) Find(arrs []string) (*Command, []string, error) {
 		if len(args) > 0 && c.HasSubCommands() {
 			argsWOflags := stripFlags(args)
 			if len(argsWOflags) > 0 {
+				matches := make([]*Command, 0)
 				for _, cmd := range c.commands {
 					if cmd.Name() == argsWOflags[0] || cmd.HasAlias(argsWOflags[0]) { // exact name or alias match
 						return innerfind(cmd, argsMinusX(args, argsWOflags[0]))
+					} else {
+						if strings.HasPrefix(cmd.Name(), argsWOflags[0]) { // prefix match
+							matches = append(matches, cmd)
+						}
+						for _, x := range cmd.Aliases {
+							if strings.HasPrefix(x, argsWOflags[0]) {
+								matches = append(matches, cmd)
+							}
+						}
 					}
 				}
+
+				// only accept a single prefix match - multiple matches would be ambiguous
+				if len(matches) == 1 {
+					return innerfind(matches[0], argsMinusX(args, argsWOflags[0]))
+				}
 			}
 		}