From 43c8c02cf5a10196e5a4c458fdbfee90a561e97c Mon Sep 17 00:00:00 2001
From: zhuchensong <zhuchensong93@163.com>
Date: Mon, 17 Apr 2017 00:47:04 +0800
Subject: [PATCH] Support POSIX-style short flag combining

---
 command.go | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/command.go b/command.go
index be8f8f0..189209d 100644
--- a/command.go
+++ b/command.go
@@ -142,7 +142,19 @@ func (c Command) Run(ctx *Context) (err error) {
 				flagArgs = args[firstFlagIndex:]
 			}
 
-			err = set.Parse(append(flagArgs, regularArgs...))
+			// separate combined flags
+			var flagArgsSeparated []string
+			for _, flagArg := range flagArgs {
+				if strings.HasPrefix(flagArg, "-") && strings.HasPrefix(flagArg, "--") == false && len(flagArg) >2 {
+					for _, flagChar := range flagArg[1:] {
+						flagArgsSeparated = append(flagArgsSeparated, "-" + string(flagChar))
+					}
+				} else {
+					flagArgsSeparated = append(flagArgsSeparated, flagArg)
+				}
+			}
+
+			err = set.Parse(append(flagArgsSeparated, regularArgs...))
 		} else {
 			err = set.Parse(ctx.Args().Tail())
 		}