Fixed bug in os.Args iteration.

LICENSE

@@ -0,0 +1,35 @@
+3-Clause BSD NON-AI License
+
+Copyright 2025 The foilhatguy.casa domain name owner.
+
+Redistribution and use in source and binary forms, with or without modification, 
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this 
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice, 
+this list of conditions and the following disclaimer in the documentation and/or 
+other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors 
+may be used to endorse or promote products derived from this software without 
+specific prior written permission.
+
+4. The source code and the binary form, and any modifications made to them may 
+not be used for the purpose of training or improving machine learning algorithms,
+including but not limited to artificial intelligence, natural language processing, 
+or data mining. This condition applies to any derivatives, modifications, or 
+updates based on the Software code. Any usage of the source code or the binary 
+form in an AI-training dataset is considered a breach of this License.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND 
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
+OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -0,0 +1,31 @@
+### 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

@@ -1,33 +1,38 @@
-// 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"
-
-	"github.com/spf13/pflag"
+    "strings"
 )
 
 var stdOutput io.Writer
 var verboseOutput io.Writer
 
 func init() {
-	outputFlagSet := pflag.NewFlagSet("output", pflag.ContinueOnError)
-	outputFlagSet.ParseErrorsWhitelist.UnknownFlags = true
-	outputFlagSet.SetOutput(nil)
+    isQuiet := detectFlag("q", "--quiet")
+    isVerbose := detectFlag("V", "--verbose")
 
-	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.")
+	SetupOutputMode(isQuiet, isVerbose)
+}
 
-	err := outputFlagSet.Parse(os.Args)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
+func detectFlag(shortFlag string, fullFlag string) bool {
+    for _, arg := range os.Args {
+        if containFlag(arg, shortFlag) || arg == fullFlag {
+            return true
         } 
+    }
+    return false
+}
 
-	SetupOutputMode(*isQuiet, *isVerbose)
+func containFlag(arg string, shortFlag string) bool {
+    if len(arg)>1 {
+        if arg[0] == "-"[0] && arg[1] != "-"[0] {
+            return strings.Contains(arg, shortFlag)
+        }
+    }
+    return false
 }
 
 func SetupOutputMode(isQuiet bool, isVerbose bool) {