From daa631dbb2891b6fb88357c4e6e5750bf4ed6e70 Mon Sep 17 00:00:00 2001
From: Silvan Jegen <s.jegen@gmail.com>
Date: Tue, 29 Nov 2016 20:53:06 +0100
Subject: Do something in the StringFilter

---
 manager.go | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/manager.go b/manager.go
index 91933f9..b6b41fb 100644
--- a/manager.go
+++ b/manager.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strings"
 )
 
 type Manager struct {
@@ -28,7 +29,8 @@ type Filter interface {
 }
 
 type StringFilter struct {
-	retchan chan *Work
+	retchan       chan *Work
+	FilterFuncMap map[string]func(string) string
 }
 
 type Output interface {
@@ -67,6 +69,10 @@ func (i *StdinInput) Start() chan *Work {
 
 func (f *StringFilter) Filter(ic chan *Work) chan *Work {
 	f.retchan = make(chan *Work, 100)
+	if f.FilterFuncMap == nil {
+		f.FilterFuncMap = make(map[string]func(string) string, 10)
+		f.FilterFuncMap["F"] = func(s string) string { return strings.ToUpper(s) }
+	}
 
 	go func() {
 		for w := range ic {
@@ -84,7 +90,26 @@ func (f *StringFilter) Filter(ic chan *Work) chan *Work {
 				w.err = err
 			}
 
-			fmt.Printf("jm: %v\n", jm)
+			changed := false
+			for k, v := range jm {
+				ff, ok := f.FilterFuncMap[k]
+				if !ok {
+					continue
+				}
+
+				jm[k] = ff(v)
+				changed = true
+			}
+			if changed {
+				bs, err := json.Marshal(jm)
+				if err != nil {
+					fmt.Printf("Error when marshalling JSON: %q\n", err)
+					w.err = err
+				} else {
+					w.data = bs
+				}
+			}
+
 			f.retchan <- w
 		}
 		close(f.retchan)
-- 
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