From d910a04b50558720351969b37a39a931b37b99c7 Mon Sep 17 00:00:00 2001
From: Anastasis Andronidis <anastasis90@yahoo.gr>
Date: Thu, 14 May 2015 19:38:15 +0200
Subject: [PATCH] Add Global Normalization Function

[close #110]
---
 cobra_test.go | 27 +++++++++++++++++++++++++++
 command.go    | 24 ++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/cobra_test.go b/cobra_test.go
index 71243b51..9848d211 100644
--- a/cobra_test.go
+++ b/cobra_test.go
@@ -8,6 +8,8 @@ import (
 	"runtime"
 	"strings"
 	"testing"
+
+	"github.com/spf13/pflag"
 )
 
 var _ = fmt.Println
@@ -913,3 +915,28 @@ func TestPeristentPreRunPropagation(t *testing.T) {
 		t.Error("RootCmd PersistentPreRun not called but should have been")
 	}
 }
+
+func TestGlobalNormFuncPropagation(t *testing.T) {
+	normFunc := func(f *pflag.FlagSet, name string) pflag.NormalizedName {
+		return pflag.NormalizedName(name)
+	}
+
+	rootCmd := initialize()
+	rootCmd.SetGlobalNormalizationFunc(normFunc)
+	if reflect.ValueOf(normFunc) != reflect.ValueOf(rootCmd.GlobalNormalizationFunc()) {
+		t.Error("rootCmd seems to have a wrong normalization function")
+	}
+
+	// First add the cmdEchoSub to cmdPrint
+	cmdPrint.AddCommand(cmdEchoSub)
+	if cmdPrint.GlobalNormalizationFunc() != nil && cmdEchoSub.GlobalNormalizationFunc() != nil {
+		t.Error("cmdPrint and cmdEchoSub should had no normalization functions")
+	}
+
+	// Now add cmdPrint to rootCmd
+	rootCmd.AddCommand(cmdPrint)
+	if reflect.ValueOf(cmdPrint.GlobalNormalizationFunc()).Pointer() != reflect.ValueOf(rootCmd.GlobalNormalizationFunc()).Pointer() ||
+		reflect.ValueOf(cmdEchoSub.GlobalNormalizationFunc()).Pointer() != reflect.ValueOf(rootCmd.GlobalNormalizationFunc()).Pointer() {
+		t.Error("cmdPrint and cmdEchoSub should had the normalization function of rootCmd")
+	}
+}
diff --git a/command.go b/command.go
index 7dd34f6d..3831c337 100644
--- a/command.go
+++ b/command.go
@@ -94,6 +94,8 @@ type Command struct {
 	helpFunc      func(*Command, []string) // Help can be defined by application
 	helpCommand   *Command                 // The help command
 	helpFlagVal   bool
+	// The global normalization function that we can use on every pFlag set and children commands
+	globNormFunc func(f *flag.FlagSet, name string) flag.NormalizedName
 }
 
 // os.Args[1:] by default, if desired, can be overridden
@@ -152,6 +154,19 @@ func (c *Command) SetHelpTemplate(s string) {
 	c.helpTemplate = s
 }
 
+// SetGlobalNormalizationFunc sets a normalization function to all flag sets and also to child commands.
+// The user should not have a cyclic dependency on commands.
+func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string) flag.NormalizedName) {
+	c.Flags().SetNormalizeFunc(n)
+	c.PersistentFlags().SetNormalizeFunc(n)
+	c.LocalFlags().SetNormalizeFunc(n)
+	c.globNormFunc = n
+
+	for _, command := range c.commands {
+		command.SetGlobalNormalizationFunc(n)
+	}
+}
+
 func (c *Command) UsageFunc() (f func(*Command) error) {
 	if c.usageFunc != nil {
 		return c.usageFunc
@@ -610,6 +625,10 @@ func (c *Command) AddCommand(cmds ...*Command) {
 		if nameLen > c.commandsMaxNameLen {
 			c.commandsMaxNameLen = nameLen
 		}
+		// If glabal normalization function exists, update all children
+		if c.globNormFunc != nil {
+			x.SetGlobalNormalizationFunc(c.globNormFunc)
+		}
 		c.commands = append(c.commands, x)
 	}
 }
@@ -834,6 +853,11 @@ func (c *Command) HasParent() bool {
 	return c.parent != nil
 }
 
+// GlobalNormalizationFunc returns the global normalization function or nil if doesn't exists
+func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName {
+	return c.globNormFunc
+}
+
 // Get the complete FlagSet that applies to this command (local and persistent declared here and by all parents)
 func (c *Command) Flags() *flag.FlagSet {
 	if c.flags == nil {