README.md

@@ -1,31 +0,0 @@
-### The "UI" package
-
-This package provides --verbose and --quiet flag features to your cli.
-It recognize both short and long flags. The package contains three functions:
-- **PrintOut** to print regular messages unless --quiet flag is set.
-- **PrintVerbose** to print messages only if --verbose flag is set, but --quiet
-flag is not.
-- **SetupOutputMode** to reconfigure output mode in the runtime.
-
--------------
-
-### Usage
-1. Download the package by **go get** command:
-```shell
-go get code.foilhatguy.casa/pub/ui
-```
-2. Import package to your golang code:
-```go
-import (
-	"code.foilhatguy.casa/pub/ui"
-)
-```
-There is no need for additional configuration. The package have its own **init** 
-function to detect --verbose and --quiet flags.
-
-3. Use **PrintOut** and **PrintVerbose** functions to print
-messages to the standard output:
-```go
-    ui.PrintOut("Some regular message.")
-    ui.PrintVerbose("Some message printed only if --verbose flag is set.")
-```

ui.go

@@ -1,38 +1,33 @@
+// This package provides --quiet and --verbose flags for cli and corresponding output print functions PrintOut and PrintVerbose.
+// Another line
 package ui
 
 import (
 	"fmt"
 	"io"
 	"os"
-    "strings"
+
+	"github.com/spf13/pflag"
 )
 
 var stdOutput io.Writer
 var verboseOutput io.Writer
 
 func init() {
-    isQuiet := detectFlag("q", "--quiet")
+	outputFlagSet := pflag.NewFlagSet("output", pflag.ContinueOnError)
-    isVerbose := detectFlag("V", "--verbose")
+	outputFlagSet.ParseErrorsWhitelist.UnknownFlags = true
+	outputFlagSet.SetOutput(nil)
 
-	SetupOutputMode(isQuiet, isVerbose)
+	isVerbose := outputFlagSet.BoolP("verbose", "V", false, "If set adds additional details to output.")
-}
+	isQuiet := outputFlagSet.BoolP("quiet", "q", false, "If set makes no output at all.")
 
-func detectFlag(shortFlag string, fullFlag string) bool {
+	err := outputFlagSet.Parse(os.Args)
-    for _, arg := range os.Args {
+	if err != nil {
-        if containFlag(arg, shortFlag) || arg == fullFlag {
+		fmt.Println(err)
-            return true
+		os.Exit(1)
 	}
-    }
-    return false
-}
 
-func containFlag(arg string, shortFlag string) bool {
+	SetupOutputMode(*isQuiet, *isVerbose)
-    if len(arg)>1 {
-        if arg[0] == "-"[0] && arg[1] != "-"[0] {
-            return strings.Contains(arg, shortFlag)
-        }
-    }
-    return false
 }
 
 func SetupOutputMode(isQuiet bool, isVerbose bool) {