CliParser.Init() accepts optional flags. Currently una flag is available: ResetOnEqualSign

README.md

@@ -0,0 +1,84 @@
+# go-pkg/cli
+
+Lightweight, dependency-free command-line argument and option parsing library for Go.
+
+## Overview
+
+This package provides a small, composable CLI parser with support for:
+- boolean, string, int, and array/map options
+- positional arguments (single and repeating)
+- aliases, short flags, defaults and hidden options
+- validation for incompatible options and custom "special" values
+- automatic usage and version printing
+
+See the core parser implementation in [`parser.go`](parser.go) and the high-level API in [`cli.go`](cli.go).
+
+## Features
+
+- Option types: [`AddBoolOpt`](opt-bool.go), [`AddStringOpt`](opt-string.go), [`AddIntOpt`](opt-int.go), [`AddStringArrayOpt`](opt-string-array.go), [`AddIntArrayOpt`](opt-int-array.go), [`AddStringMapOpt`](opt-string-map.go)
+- Positional args: [`AddStringArg`](arg-string.go), [`AddStringArrayArg`](arg-string-array.go)
+- Usage & version output: [`CliParser.Usage`](cli-usage.go), [`CliParser.PrintVersion`](cli-version.go)
+- Option tracing via [`CliParser.TraceOptions`](cli.go) and [`SimpleOptionTracer`](simple-opt-tracer.go)
+- Programmatic option setting: [`SetOptionValue`](opt-manager.go)
+
+## Quick start
+
+Example: define options and parse argv
+
+```go
+package main
+
+import (
+  "fmt"
+  "git.portale-stac.it/go-pkg/cli"
+)
+
+func main() {
+  var parser cli.CliParser
+  parser.Init([]string{"prog", "--debug", "--config", "app.yaml", "input.txt"}, "$VER:prog,0.1.0,2025,email:$")
+
+  // define target variables and options
+  var debug bool
+  var config string
+  var inputs []string
+
+  parser.AddBoolOpt("debug", "d", &debug, "Enable debug")
+  parser.AddStringOpt("config", "c", &config, "app.yaml", "Config file")
+  parser.AddStringArrayArg("files", true, &inputs, "Input files")
+
+  // print usage: parser.Usage() - see [`CliParser.Usage`](cli-usage.go)
+  if err := parser.Parse(); err != nil {
+    fmt.Println("parse error:", err)
+    return
+  }
+
+  fmt.Println("debug:", debug)
+  fmt.Println("config:", config)
+  fmt.Println("inputs:", inputs)
+}
+```
+
+Refer to the unit test for a realistic example: [`cli_test.go`](cli_test.go).
+
+## API Reference
+
+Key types and methods:
+- [`CliParser`](cli.go) — main parser type
+- [`CliParser.Init`](cli.go) — initialize with argv and version
+- [`CliParser.Parse`](cli.go) — run parsing
+- Option constructors: [`AddBoolOpt`](opt-bool.go), [`AddStringOpt`](opt-string.go), [`AddIntOpt`](opt-int.go), [`AddStringArrayOpt`](opt-string-array.go), [`AddIntArrayOpt`](opt-int-array.go), [`AddStringMapOpt`](opt-string-map.go)
+- Arg constructors: [`AddStringArg`](arg-string.go), [`AddStringArrayArg`](arg-string-array.go)
+- Utilities: [`TraceOptions`](cli.go), [`SetOptionValue`](opt-manager.go), [`SimpleOptionTracer`](simple-opt-tracer.go)
+
+For implementation details, consult:
+- parser internals: [`parser.go`](parser.go)
+- option base helpers: [`opt-base.go`](opt-base.go)
+- usage/version printing: [`cli-usage.go`](cli-usage.go), [`cli-version.go`](cli-version.go)
+
+## License
+
+This project is licensed under the terms in [LICENSE](LICENSE).
+
+## Contributing
+
+Open issues or pull requests are welcome. Run and extend the tests in [`cli_test.go`](cli_test.go) when making changes.

cli-usage.go

@@ -11,6 +11,12 @@ func (cli *CliParser) Usage() string {
 	var sb strings.Builder
 
 	program, _ := cli.GetVersionSection("program")
+	fmt.Fprint(&sb, "NAME ", program)
+	if cli.description != "" {
+		fmt.Fprint(&sb, " - ", cli.description)
+	}
+	sb.WriteByte('\n')
+
 	publicCount := cli.publicOptionCount()
 	if publicCount > 0 {
 		fmt.Fprintf(&sb, "USAGE: %s [<options>] %s\n", program, cli.getArgsTemplate())

cli.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"fmt"
+	"strings"
 )
 
 type CliOptionTracer interface {
@@ -13,10 +14,11 @@ type cliParser interface {
 	getCliArgs(startIndex, endIndex int) (args []string)
 	PrintVersion(specs []string)
 	PrintUsage()
+	FlagIsSet(flag int16) bool
 }
 
 type cliOptionParser interface {
-	parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error)
+	parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, optValue string, err error)
 	getTemplate() string
 	getDefaultValue() string
 	getBase() *cliOptionBase
@@ -24,6 +26,7 @@ type cliOptionParser interface {
 	isSet() bool
 	isHidden() bool
 	requiresValue() bool
+	finalCheck() (err error)
 }
 
 type OptManager interface {
@@ -31,22 +34,51 @@ type OptManager interface {
 }
 
 type SpecialValueFunc func(manager OptManager, cliValue string, currentValue any) (value any, err error)
+type FinalCheckFunc func(currentValue any) (err error)
 
 type OptReference interface {
 	AddSpecialValue(cliValue string, specialFunc SpecialValueFunc)
+	OnFinalCheck(checkFunc FinalCheckFunc)
 	SetHidden(hidden bool)
 }
 
+const (
+	ResetOnEqualSign = int16(1 << iota) // for some option types, like arrays, the equal signs reset to empty the accumulator of values
+)
+
 type CliParser struct {
-	version  string
+	description string
-	options  []cliOptionParser
+	version     string
-	argSpecs []argSpec
+	options     []cliOptionParser
-	cliArgs  []string
+	argSpecs    []argSpec
+	cliArgs     []string
+	flags       int16
 }
 
-func (cli *CliParser) Init(argv []string, version string) {
+func (cli *CliParser) Init(argv []string, version string, description string, flags ...int16) {
 	cli.version = version
+	cli.description = description
 	cli.cliArgs = argv
+	for _, flag := range flags {
+		cli.flags |= flag
+	}
+}
+
+func (cli *CliParser) FlagIsSet(flag int16) bool {
+	return (cli.flags & flag) == flag
+}
+func (cli *CliParser) GetOption(name string) (ref OptReference) {
+	var opt cliOptionParser
+	if strings.HasPrefix(name, "-") {
+		opt = cli.findOptionByArg(name)
+	} else {
+		opt = cli.findOptionByName(name)
+	}
+	if opt != nil {
+		ref = opt.(OptReference)
+	}
+	return ref
+
 }
 
 func (cli *CliParser) SetIncompatibleOption(optName string, incompatibleOptNames ...string) error {
@@ -138,16 +170,12 @@ func (cli *CliParser) addHelpAndVersion() {
 
 }
 
-func (cli *CliParser) Parse() (err error) {
+func (cli *CliParser) parseOptions() (commandArgs []string, err error) {
-	var arg string
+	// var commandArgs []string
-	var i int
-	var args []string
 	var optionsAllowed bool = true
 
-	cli.addHelpAndVersion()
-
 	skipNext := false
-	for i, arg = range cli.cliArgs[1:] {
+	for i, arg := range cli.cliArgs[1:] {
 		if skipNext {
 			skipNext = false
 		} else {
@@ -161,43 +189,82 @@ func (cli *CliParser) Parse() (err error) {
 					break
 				}
 			} else {
-				args = append(args, arg)
+				commandArgs = append(commandArgs, arg)
 			}
 		}
 	}
-	if err == nil {
+	return
-		var argSpec argSpec
+}
-		var n, specIndex int
-		i = 0
 
-		for specIndex, argSpec = range cli.argSpecs {
+func (cli *CliParser) checkOptionValues() (err error) {
-			if n, err = argSpec.parse(cli, specIndex, args, i); err != nil {
+	for _, opt := range cli.options {
-				break
+		if err = opt.finalCheck(); err != nil {
-			}
+			break
-			i += n
-			if i >= len(args) {
-				break
-			}
 		}
-		if err == nil {
+	}
-			if i < len(args) {
+	return
-				err = fmt.Errorf("too many arguments: %d allowed", i)
+}
-			} else {
+
-				specIndex++
+func (cli *CliParser) parseCommandArgs(commandArgs []string) (err error) {
+	var n int
+
+	i := 0
+	// acquire arguments as required by the argSpecs
+	specIndex := -1
+	for index, argSpec := range cli.argSpecs {
+		specIndex = index
+		if n, err = argSpec.parse(cli, specIndex, commandArgs, i); err != nil {
+			break
+		}
+		i += n
+		if i >= len(commandArgs) {
+			break
+		}
+	}
+
+	// check if there are remaining arg-specs that require a value
+	if err == nil {
+		if i < len(commandArgs) {
+			err = fmt.Errorf("too many arguments: %d allowed", i)
+		} else {
+			specIndex++
+			if specIndex < len(cli.argSpecs) {
+				// skip all non required args
 				for _, spec := range cli.argSpecs[specIndex:] {
 					if !spec.getBase().required {
 						specIndex++
 					}
 				}
-				if specIndex < len(cli.argSpecs) {
+			}
-					err = errTooFewArguments(len(cli.argSpecs))
+			// return error if there are remaining arg-specs that require a value
-				}
+			if specIndex < len(cli.argSpecs) {
+				err = errTooFewArguments(len(cli.argSpecs))
 			}
 		}
 	}
 	return
 }
 
+func (cli *CliParser) Parse() (err error) {
+	var commandArgs []string
+
+	cli.addHelpAndVersion()
+
+	// first parse options and collect command arguments in the args array
+	if commandArgs, err = cli.parseOptions(); err != nil {
+		return
+	}
+
+	// do final checks
+	if err = cli.checkOptionValues(); err != nil {
+		return
+	}
+
+	// then parse collected arguments
+	err = cli.parseCommandArgs(commandArgs)
+	return
+}
+
 func (cli *CliParser) checkCompatibility(arg string) (err error) {
 	var opti cliOptionParser
 	if opti = cli.findOptionByArg(arg); opti != nil {

cli_test.go

@@ -6,76 +6,391 @@ import (
 	"testing"
 )
 
-type GlobaData struct {
+const version = `$VER:ddt-ocr,1.0.1,2025-11-23,celestino.amoroso@gmail.com:$`
-	config      string
+
-	log         []string
+type GlobalData struct {
-	printOcr    bool
+	config    string
-	saveClips   bool
+	log       []string
-	trace       bool
+	printOcr  bool
-	page        []int
+	saveClips bool
-	sources     []string
+	trace     bool
-	dest        string
+	page      []int
-	facoltativo string
+	cliVars   map[string]string
+	inputName string
+	workDir   string
+	attempts  int
+	sources   []string
+	dest      string
+	report    string
+	verbose   int
 }
 
-func (gd *GlobaData) String() string {
+func TestVerbose(t *testing.T) {
-	var sb strings.Builder
-	fmt.Fprintf(&sb, "Options:\n")
-	fmt.Fprintf(&sb, "  Config.....: %q\n", gd.config)
-	fmt.Fprintf(&sb, "  Log........: %v\n", gd.log)
-	fmt.Fprintf(&sb, "  Print-Ocr..: %v\n", gd.printOcr)
-	fmt.Fprintf(&sb, "  Save-Clips.: %v\n", gd.saveClips)
-	fmt.Fprintf(&sb, "  Page.......: %v\n", gd.page)
-	fmt.Fprintf(&sb, "  Trace......: %v\n", gd.trace)
-	fmt.Fprintf(&sb, "Argumentes:\n")
-	fmt.Fprintf(&sb, "  Sources....: %s\n", strings.Join(gd.sources, ", "))
-	fmt.Fprintf(&sb, "  Destination: %s\n", gd.dest)
-	fmt.Fprintf(&sb, "  Facoltativo: %s\n", gd.facoltativo)
-	return sb.String()
-}
-
-func TestUsage(t *testing.T) {
 	var cli CliParser
-	var version = `$VER:mini-ddt-ocr,1.0.1,2025-11-23,celestino.amoroso@gmail.com:$`
+	var gd GlobalData
-	var gd GlobaData
+
-	args := []string{
+	if err := initCli(&cli, &gd); err != nil {
-		"mini-ddt-ocr",
-		"--log", "all",
-		"--config", "devel-config.yaml",
-		// "--var", "deploy_env=devel",
-		"--print-ocr",
-		"--pages", "17,18",
-		"../../dev-stuff/ocis-upload.log", "ciccio", "bello", "pippo",
-	}
-	cli.Init(args, version)
-	if err := gd.addOptions(&cli); err != nil {
 		t.Error(err)
 		return
 	}
-	usage := cli.Usage()
+	if err := cli.Parse(); err != nil {
-	fmt.Println(usage)
+		t.Error(err)
-	if err := cli.Parse(); err == nil {
+	} else if gd.verbose != 3 {
-		fmt.Println(&gd)
+		t.Errorf("Expected verbose level 3, got %d", gd.verbose)
+	}
+}
+
+func TestVersion(t *testing.T) {
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCli(&cli, &gd); err != nil {
+		t.Error(err)
+		return
+	}
+	if v, err := cli.GetVersionSection("all"); err == nil {
+		if v != version[5:len(version)-2] {
+			t.Errorf("Version string does not match expected.\nGot:\n%q\nExpected:\n%q", v, version)
+		}
 	} else {
 		t.Error(err)
 	}
 }
 
-func (gd *GlobaData) addOptions(cli *CliParser) (err error) {
+func TestVersionNumber(t *testing.T) {
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCli(&cli, &gd); err != nil {
+		t.Error(err)
+		return
+	}
+	secValues := []string{"ddt-ocr", "1.0.1", "2025-11-23", "celestino.amoroso@gmail.com"}
+	for i, sec := range []string{"program", "version", "date", "email"} {
+		if v, err := cli.GetVersionSection(sec); err == nil {
+			if v != secValues[i] {
+				t.Errorf("Version section %q does not match expected value.\nGot:\n%q\nExpected:\n%q", sec, v, version)
+			}
+		} else {
+			t.Error(err)
+		}
+	}
+}
+
+func TestUsage(t *testing.T) {
+	const expectedUsage = `NAME ddt-ocr - cli-test
+USAGE: ddt-ocr [<options>] <image-sources> ... <dest> [<report>]
+where:
+  <image-sources>  Source image files
+  <dest>  Output destination file
+  <report>  Optional report file
+  <options>
+    -V, --verbose                   Print verbose output (default: "0")
+    -o, --print-ocr                 Print the OCR output to stderr
+    -s, --save-clip                 Save the image clips as PNG files (alias: save-clips)
+    -t, --trace                     Enable trace mode for detailed logging
+    -p, --page(s) <num>["," ...]    Process only the specified pages (comma-separated list)
+    -c, --config <file>             Alternate configuration file
+    -l, --log(s) <string>["," ...]  Logging options (comma-separated list)
+    --var(s) <key=value>["," ...]   Define one or more comma separated variables for the actions context (multiple allowed)
+    -n, --input-name <string>       Input file name when source comes from stdin
+    -d, --work-dir <dir>            Work directory
+    --attempts <num>                Attempts for retrying failed operations (default: "1")
+`
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCli(&cli, &gd); err != nil {
+		t.Error(err)
+		return
+	}
+	usage := cli.Usage()
+	if usage != expectedUsage {
+		t.Errorf("Usage output does not match expected.\nGot:\n%s\nExpected:\n%s", usage, expectedUsage)
+	}
+}
+func TestParser(t *testing.T) {
+	const expectedOutput = `Option: verbose, Type: num, Value: 3
+Option: print-ocr, Type: bool, Value: true
+Option: save-clip, Type: bool, Value: false
+Option: trace, Type: bool, Value: true
+Option: page, Type: num-array, Value: [17 18]
+Option: config, Type: string, Value: devel-config.yaml
+Option: log, Type: string-array, Value: [all]
+Option: var, Type: map-string, Value: map[deploy_env:devel]
+Option: input-name, Type: string, Value: my-scan.pdf
+Option: work-dir, Type: string, Value: 
+Option: attempts, Type: num, Value: 1
+Option: help, Type: n/a, Value: <nil>
+Option: version, Type: n/a, Value: <nil>
+`
+
+	var cli CliParser
+	var gd GlobalData
+	var sb strings.Builder
+
+	if err := initCli(&cli, &gd); err != nil {
+		t.Error(err)
+		return
+	}
+	tracer := NewSimpleOptionTracer(&sb)
+	if err := cli.Parse(); err == nil {
+		cli.TraceOptions(tracer)
+		if sb.String() != expectedOutput {
+			t.Errorf("Parsed options do not match expected list.\nGot:\n%q\nExpected:\n%q", sb.String(), expectedOutput)
+		}
+	} else {
+		t.Error(err)
+	}
+}
+
+func initCli(cli *CliParser, gd *GlobalData) (err error) {
+	args := []string{
+		"ddt-ocr",
+		"--log", "all",
+		"-t",
+		"-VVV",
+		"--config", "devel-config.yaml",
+		"--var", "deploy_env=devel",
+		"--print-ocr",
+		"--pages", "17,18",
+		"--input-name=my-scan.pdf",
+		"scan1.pdf", "scan2.pdf", "result.txt", "report.txt",
+	}
+	cli.Init(args, version, "cli-test")
+	err = gd.addOptions(cli)
+	return
+}
+
+func TestOptErrorUnknownOption(t *testing.T) {
+	const unknownOption = "--logging"
+	var expectedErr = errUnknownOption(unknownOption)
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCliUnknownOption(&cli, &gd, unknownOption); err == nil {
+		if err = cli.Parse(); err != nil {
+			if err.Error() != expectedErr.Error() {
+				t.Errorf("Invalid error message.\nGot:\n%v\nExpected:\n%v", err, expectedErr)
+			}
+		} else {
+			t.Errorf("Expected error for unknown option %q, but got none", unknownOption)
+		}
+	} else {
+		t.Error(err)
+		return
+	}
+}
+
+func initCliUnknownOption(cli *CliParser, gd *GlobalData, option string) (err error) {
+	args := []string{
+		"ddt-ocr",
+		option,
+		"scan1.pdf", "scan2.pdf", "result.txt", "report.txt",
+	}
+	cli.Init(args, version, "cli-test")
+	err = gd.addOptions(cli)
+	return
+}
+
+func TestOptErrorMissingOptionValue(t *testing.T) {
+	const missingValueOption = "--page"
+	var expectedErr = fmt.Errorf(`invalid value scan1.pdf (string) for option "page" (num-array)`)
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCliMissingOptionValue(&cli, &gd, missingValueOption); err == nil {
+		if err = cli.Parse(); err != nil {
+			if err.Error() != expectedErr.Error() {
+				t.Errorf("Invalid error message.\nGot:\n%v\nExpected:\n%v", err, expectedErr)
+			}
+		} else {
+			t.Errorf("Expected error for unknown option %q, but got none", missingValueOption)
+		}
+	} else {
+		t.Error(err)
+		return
+	}
+}
+
+func initCliMissingOptionValue(cli *CliParser, gd *GlobalData, option string) (err error) {
+	args := []string{
+		"ddt-ocr",
+		option,
+		"scan1.pdf", "scan2.pdf", "result.txt", "report.txt",
+	}
+	cli.Init(args, version, "cli-test")
+	err = gd.addOptions(cli)
+	return
+}
+
+func TestOptErrorInvalidOptionValue(t *testing.T) {
+	const missingInvalidValueOption = "--page"
+	var expectedErr = errInvalidOptionValue("page", "some", "num-array")
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCliInvalidOptionValue(&cli, &gd, missingInvalidValueOption); err == nil {
+		if err = cli.Parse(); err != nil {
+			if err.Error() != expectedErr.Error() {
+				t.Errorf("Invalid error message.\nGot:\n%v\nExpected:\n%v", err, expectedErr)
+			}
+		} else {
+			t.Errorf("Expected error for unknown option %q, but got none", missingInvalidValueOption)
+		}
+	} else {
+		t.Error(err)
+		return
+	}
+}
+
+func initCliInvalidOptionValue(cli *CliParser, gd *GlobalData, option string) (err error) {
+	args := []string{
+		"ddt-ocr",
+		option, "some",
+		"scan1.pdf", "scan2.pdf", "result.txt", "report.txt",
+	}
+	cli.Init(args, version, "cli-test")
+	err = gd.addOptions(cli)
+	return
+}
+
+func TestArgErrorMissingRequired(t *testing.T) {
+	const missingRequiredArg = "--page"
+	var expectedErr = fmt.Errorf(`missing required arg <image-sources>`)
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCliMissingRequiredArg(&cli, &gd); err == nil {
+		if err = cli.Parse(); err != nil {
+			if err.Error() != expectedErr.Error() {
+				t.Errorf("Invalid error message.\nGot:\n%v\nExpected:\n%v", err, expectedErr)
+			}
+		} else {
+			t.Errorf("Expected error for unknown option %q, but got none", missingRequiredArg)
+		}
+	} else {
+		t.Error(err)
+		return
+	}
+}
+
+func initCliMissingRequiredArg(cli *CliParser, gd *GlobalData) (err error) {
+	args := []string{
+		"ddt-ocr",
+	}
+	cli.Init(args, version, "cli-test")
+	err = gd.addOptions(cli)
+	return
+}
+
+func TestArgErrorRepeat(t *testing.T) {
+	var expectedErr = fmt.Errorf(`repeat property already set for arg <other>`)
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCliRepeatArg(&cli, &gd); err != nil {
+		if err.Error() != expectedErr.Error() {
+			t.Errorf("Invalid error message.\nGot:\n%v\nExpected:\n%v", err, expectedErr)
+		}
+	} else {
+		t.Errorf("Expected error, but got none")
+	}
+}
+
+func initCliRepeatArg(cli *CliParser, gd *GlobalData) (err error) {
+	args := []string{
+		"ddt-ocr",
+		"scan1.pdf", "scan2.pdf", "result.txt", "report.txt",
+	}
+	cli.Init(args, version, "cli-test")
+	if err = gd.addOptions(cli); err == nil {
+		defer func() {
+			if r := recover(); r != nil {
+				err = r.(error)
+			}
+		}()
+		cli.AddStringArrayArg("other", true, nil, "other args")
+		cli.AddStringArrayArg("other2", true, nil, "other args 2")
+	}
+	return
+}
+
+func TestOptHidden(t *testing.T) {
+	const expectedUsage = `NAME ddt-ocr - cli-test
+USAGE: ddt-ocr [<options>] <image-sources> ... <dest> [<report>]
+where:
+  <image-sources>  Source image files
+  <dest>  Output destination file
+  <report>  Optional report file
+  <options>
+    -V, --verbose                   Print verbose output (default: "0")
+    -o, --print-ocr                 Print the OCR output to stderr
+    -t, --trace                     Enable trace mode for detailed logging
+    -p, --page(s) <num>["," ...]    Process only the specified pages (comma-separated list)
+    -c, --config <file>             Alternate configuration file
+    -l, --log(s) <string>["," ...]  Logging options (comma-separated list)
+    --var(s) <key=value>["," ...]   Define one or more comma separated variables for the actions context (multiple allowed)
+    -n, --input-name <string>       Input file name when source comes from stdin
+    -d, --work-dir <dir>            Work directory
+    --attempts <num>                Attempts for retrying failed operations (default: "1")
+`
+	var cli CliParser
+	var gd GlobalData
+
+	if err := initCliHiddenOpt(&cli, &gd); err != nil {
+		t.Error(err)
+		return
+	}
+	usage := cli.Usage()
+	if usage != expectedUsage {
+		t.Errorf("Usage output does not match expected text.\nGot:\n%s\nExpected:\n%s", usage, expectedUsage)
+	}
+}
+
+func initCliHiddenOpt(cli *CliParser, gd *GlobalData) (err error) {
+	if err = initCli(cli, gd); err == nil {
+		if ref := cli.GetOption("save-clip"); ref != nil {
+			ref.SetHidden(true)
+		} else {
+			err = fmt.Errorf("option save-clip not found")
+		}
+	}
+	return
+}
+
+func (gd *GlobalData) addOptions(cli *CliParser) (err error) {
+	// Always recover from panic to return error before adding options
 	defer func() {
 		if r := recover(); r != nil {
 			err = r.(error)
 		}
 	}()
-	cli.AddBoolOpt("print-ocr", "o", &gd.printOcr, "Stampa l'output del programma OCR")
-	cli.AddBoolOpt("save-clip", "s", &gd.saveClips, "Registra le immagini delle aree ritagliata", "save-clips")
-	cli.AddBoolOpt("trace", "t", &gd.trace, "Attiva la modalità di tracciamento delle operazioni")
-	cli.AddIntArrayOpt("page", "p", &gd.page, gd.page, "Elabora la pagina specificata")
-	cli.AddStringOpt("config", "c", &gd.config, gd.config, "Specifica un percorso alternativo per il file di configurazione")
-	cli.AddStringArrayOpt("log", "l", &gd.log, gd.log, "Maschera di livelli di log")
 
-	cli.AddStringArrayArg("sorgenti", true, &gd.sources, "file da elaborare")
+	// Define options
-	cli.AddStringArg("dest", true, &gd.dest, "file di outout")
+	cli.AddMultiOpt("verbose", "V", &gd.verbose, 0, "Print verbose output")
-	cli.AddStringArg("facoltativo", false, &gd.facoltativo, "file facoltativo")
+	cli.AddBoolOpt("print-ocr", "o", &gd.printOcr, "Print the OCR output to stderr")
+	cli.AddBoolOpt("save-clip", "s", &gd.saveClips, "Save the image clips as PNG files", "save-clips")
+	cli.AddBoolOpt("trace", "t", &gd.trace, "Enable trace mode for detailed logging")
+	cli.AddIntArrayOpt("page", "p", &gd.page, gd.page, "Process only the specified pages (comma-separated list)")
+	cli.AddFileOpt("config", "c", &gd.config, gd.config, "Alternate configuration file")
+	cli.AddStringArrayOpt("log", "l", &gd.log, gd.log, "Logging options (comma-separated list)")
+	cli.AddStringMapOpt("var", "", &gd.cliVars, nil, "Define one or more comma separated variables for the actions context (multiple allowed)")
+	cli.AddStringOpt("input-name", "n", &gd.inputName, "", "Input file name when source comes from stdin")
+	cli.AddDirOpt("work-dir", "d", &gd.workDir, "", "Work directory")
+	if ref := cli.AddIntOpt("attempts", "", &gd.attempts, 1, "Attempts for retrying failed operations"); ref != nil {
+		ref.AddSpecialValue("many", func(manager OptManager, cliValue string, currentValue any) (any, error) {
+			return 1000, nil
+		})
+		ref.AddSpecialValue("few", func(manager OptManager, cliValue string, currentValue any) (any, error) {
+			manager.SetOptionValue("page", "1")
+			return nil, nil
+		})
+	}
+
+	// Define arguments
+	cli.AddStringArrayArg("image-sources", true, &gd.sources, "Source image files")
+	cli.AddStringArg("dest", true, &gd.dest, "Output destination file")
+	cli.AddStringArg("report", false, &gd.report, "Optional report file")
 	return
 }

opt-base.go

@@ -13,7 +13,9 @@ type cliOptionBase struct {
 	description      string
 	isArray          bool
 	hidden           bool
+	alreadySeen      bool
 	specialValues    map[string]SpecialValueFunc
+	finalCheckFunc   FinalCheckFunc
 	incompatibleWith []string
 }
 
@@ -40,6 +42,10 @@ func (opt *cliOptionBase) SetHidden(hidden bool) {
 	opt.hidden = hidden
 }
 
+func (opt *cliOptionBase) OnFinalCheck(checkFunc FinalCheckFunc) {
+	opt.finalCheckFunc = checkFunc
+}
+
 func (opt *cliOptionBase) AddSpecialValue(cliValue string, specialFunc SpecialValueFunc) {
 	if opt.specialValues == nil {
 		opt.specialValues = make(map[string]SpecialValueFunc)
@@ -66,8 +72,9 @@ func (opt *cliOptionBase) addIncompatibleOption(names ...string) {
 	opt.incompatibleWith = append(opt.incompatibleWith, names...)
 }
 
-func (opt *cliOptionBase) parse(parser cliParser, valuePtr *string) (err error) {
+func (opt *cliOptionBase) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
-	return fmt.Errorf("unhandled option %q", opt.name)
+	err = fmt.Errorf("unhandled option %q", opt.name)
+	return
 }
 
 func (opt *cliOptionBase) getDefaultValue() string {
@@ -145,3 +152,14 @@ func (opt *cliOptionBase) fetchOptionValue(parser cliParser, argIndex int, value
 	}
 	return
 }
+
+func (opt *cliOptionBase) finalCheck() (err error) {
+	return
+}
+
+func (opt *cliOptionBase) checkValue(value any) (err error) {
+	if opt.finalCheckFunc != nil {
+		err = opt.finalCheckFunc(value)
+	}
+	return
+}

opt-bool.go

@@ -47,11 +47,11 @@ func (opt *cliOptionBool) getTemplate() (templ string) {
 	return
 }
 
-func (opt *cliOptionBool) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionBool) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, optValue string, err error) {
 	var boxedValue any
-	value := "true"
+	optValue = "true"
 
-	if boxedValue, err = opt.getSpecialValue(parser, value, opt.targetVar); err == nil {
+	if boxedValue, err = opt.getSpecialValue(parser, optValue, opt.targetVar); err == nil {
 		if opt.targetVar != nil {
 			if boxedValue != nil {
 				if val, ok := boxedValue.(bool); ok {
@@ -67,6 +67,11 @@ func (opt *cliOptionBool) parse(parser cliParser, argIndex int, valuePtr *string
 	return
 }
 
+func (opt *cliOptionBool) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}
+
 func (cli *CliParser) AddBoolOpt(name, short string, targetVar *bool, description string, aliases ...string) OptReference {
 	if cli.optionExists(name, short, aliases) {
 		panic(errOptionAlreadyDefined(name))

opt-help.go

@@ -23,7 +23,7 @@ func (opt *cliOptionHelp) getTemplate() string {
 	return opt.makeOptSimpleTemplate(false, false, "")
 }
 
-func (opt *cliOptionHelp) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionHelp) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
 	parser.PrintUsage()
 	err = io.EOF
 	return

opt-int-array.go

@@ -63,8 +63,7 @@ func parseIntRange(value string) (min int, max int, err error) {
 	return
 }
 
-func (opt *cliOptionIntArray) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionIntArray) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, optValue string, err error) {
-	var optValue string
 	if optValue, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
 		var boxedValue any
 		if boxedValue, err = opt.getSpecialValue(parser, optValue, opt.targetVar); err == nil {
@@ -73,9 +72,13 @@ func (opt *cliOptionIntArray) parse(parser cliParser, argIndex int, valuePtr *st
 					if val, ok := boxedValue.([]int); ok {
 						*opt.targetVar = val
 					} else {
-						err = errInvalidOptionValue(opt.name, boxedValue, "array of int")
+						err = errInvalidOptionValue(opt.name, boxedValue, "num-array")
 					}
 				} else {
+					if !opt.alreadySeen || (valuePtr != nil && parser.FlagIsSet(ResetOnEqualSign)) {
+						*opt.targetVar = []int{}
+						opt.alreadySeen = true
+					}
 					for value := range strings.SplitSeq(optValue, ",") {
 						var minRange, maxRange int
 						if minRange, maxRange, err = parseIntRange(value); err == nil {
@@ -83,6 +86,7 @@ func (opt *cliOptionIntArray) parse(parser cliParser, argIndex int, valuePtr *st
 								*opt.targetVar = append(*opt.targetVar, i)
 							}
 						} else {
+							err = errInvalidOptionValue(opt.name, value, "num-array")
 							break
 						}
 					}
@@ -93,6 +97,11 @@ func (opt *cliOptionIntArray) parse(parser cliParser, argIndex int, valuePtr *st
 	return
 }
 
+func (opt *cliOptionIntArray) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}
+
 func (cli *CliParser) AddIntArrayOpt(name, short string, targetVar *[]int, defaultValue []int, description string, aliases ...string) OptReference {
 	aliases = cli.checkAlreadyUsedNames(name, short, aliases)
 	opt := &cliOptionIntArray{

opt-int.go

@@ -38,11 +38,10 @@ func (opt *cliOptionInt) getTemplate() string {
 	return opt.makeOptTemplate(false, intTypeName)
 }
 
-func (opt *cliOptionInt) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionInt) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, optValue string, err error) {
-	var value string
+	if optValue, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
-	if value, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
 		var boxedValue any
-		if boxedValue, err = opt.getSpecialValue(parser, value, opt.targetVar); err == nil {
+		if boxedValue, err = opt.getSpecialValue(parser, optValue, opt.targetVar); err == nil {
 			if opt.targetVar != nil {
 				if boxedValue != nil {
 					if val, ok := boxedValue.(string); ok {
@@ -51,13 +50,17 @@ func (opt *cliOptionInt) parse(parser cliParser, argIndex int, valuePtr *string)
 						err = errInvalidOptionValue(opt.name, boxedValue, "int")
 					}
 				} else {
-					*opt.targetVar, err = strconv.Atoi(value)
+					*opt.targetVar, err = strconv.Atoi(optValue)
 				}
 			}
 		}
 	}
 	return
 }
+func (opt *cliOptionInt) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}
 
 func (cli *CliParser) AddIntOpt(name, short string, targetVar *int, defaultValue int, description string, aliases ...string) OptReference {
 	if cli.optionExists(name, short, aliases) {

opt-manager.go

@@ -2,7 +2,7 @@ package cli
 
 func (cli *CliParser) SetOptionValue(name string, value string) (err error) {
 	if opt := cli.findOptionByArg(name); opt != nil {
-		_, err = opt.parse(cli, -1, &value)
+		_, _, err = opt.parse(cli, -1, &value)
 	} else {
 		err = errOptionNotFound(name)
 	}

opt-multi.go

@@ -0,0 +1,77 @@
+package cli
+
+import (
+	"fmt"
+	"strconv"
+)
+
+const (
+	multiTypeName = "num"
+)
+
+type cliOptionMulti struct {
+	cliOptionBase
+	defaultValue int
+	targetVar    *int
+}
+
+func (opt *cliOptionMulti) init() {
+	if opt.targetVar != nil {
+		*opt.targetVar = opt.defaultValue
+	}
+}
+
+func (opt *cliOptionMulti) getTargetVar() (any, string) {
+	var value int
+	if opt.targetVar != nil {
+		value = *opt.targetVar
+	}
+	return value, multiTypeName
+}
+
+func (opt *cliOptionMulti) requiresValue() bool {
+	return false
+}
+
+func (opt *cliOptionMulti) getDefaultValue() string {
+	return strconv.Itoa(opt.defaultValue)
+}
+
+func (opt *cliOptionMulti) getTemplate() (templ string) {
+	if opt.shortAlias != "" {
+		templ = fmt.Sprintf(`-%s, --%s`, opt.shortAlias, opt.name)
+	} else {
+		templ = fmt.Sprintf(`--%s`, opt.name)
+	}
+	return
+}
+
+func (opt *cliOptionMulti) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
+	if opt.targetVar != nil {
+		*opt.targetVar++
+	}
+	value = "true"
+	return
+}
+func (opt *cliOptionMulti) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}
+
+func (cli *CliParser) AddMultiOpt(name, short string, targetVar *int, defaultValue int, description string, aliases ...string) OptReference {
+	if cli.optionExists(name, short, aliases) {
+		panic(errOptionAlreadyDefined(name))
+	}
+	opt := &cliOptionMulti{
+		cliOptionBase: cliOptionBase{
+			name:        name,
+			shortAlias:  short,
+			aliases:     aliases,
+			description: description,
+		},
+		targetVar:    targetVar,
+		defaultValue: defaultValue,
+	}
+	cli.options = append(cli.options, opt)
+	return opt
+}

opt-string-array.go

@@ -43,8 +43,7 @@ func (opt *cliOptionStringArray) getTemplate() string {
 
 // parse retrieves the option value from the parser and updates the target variable.
 // It handles comma-separated values and special values if configured.
-func (opt *cliOptionStringArray) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionStringArray) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
-	var value string
 	if value, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
 		var boxedValue any
 		if boxedValue, err = opt.getSpecialValue(parser, value, opt.targetVar); err == nil {
@@ -55,6 +54,8 @@ func (opt *cliOptionStringArray) parse(parser cliParser, argIndex int, valuePtr
 					} else {
 						err = errInvalidOptionValue(opt.name, boxedValue, "array of string")
 					}
+				} else if opt.alreadySeen {
+					*opt.targetVar = append(*opt.targetVar, strings.Split(value, ",")...)
 				} else {
 					*opt.targetVar = strings.Split(value, ",")
 				}
@@ -83,3 +84,8 @@ func (cli *CliParser) AddStringArrayOpt(name, short string, targetVar *[]string,
 	cli.options = append(cli.options, opt)
 	return opt
 }
+
+func (opt *cliOptionStringArray) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}

opt-string-map.go

@@ -57,8 +57,7 @@ func (opt *cliOptionStringMap) getTemplate() string {
 	return opt.makeOptTemplate(true, "key=value")
 }
 
-func (opt *cliOptionStringMap) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionStringMap) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
-	var value string
 	if value, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
 		var boxedValue any
 		if boxedValue, err = opt.getSpecialValue(parser, value, opt.targetVar); err == nil {
@@ -71,7 +70,7 @@ func (opt *cliOptionStringMap) parse(parser cliParser, argIndex int, valuePtr *s
 						err = errInvalidOptionValue(opt.name, boxedValue, "map of string")
 					}
 				} else {
-					if dict == nil {
+					if dict == nil || !opt.alreadySeen {
 						dict = make(map[string]string)
 					}
 					for value := range strings.SplitSeq(value, ",") {
@@ -90,6 +89,11 @@ func (opt *cliOptionStringMap) parse(parser cliParser, argIndex int, valuePtr *s
 	return
 }
 
+func (opt *cliOptionStringMap) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}
+
 func (cli *CliParser) AddStringMapOpt(name, short string, targetVar *map[string]string, defaultValue map[string]string, description string, aliases ...string) OptReference {
 	aliases = cli.checkAlreadyUsedNames(name, short, aliases)
 	opt := &cliOptionStringMap{

opt-string.go

@@ -36,8 +36,7 @@ func (opt *cliOptionString) getTemplate() string {
 	return opt.makeOptTemplate(false, stringTypeName)
 }
 
-func (opt *cliOptionString) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionString) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
-	var value string
 	if value, skipNextArg, err = opt.fetchOptionValue(parser, argIndex, valuePtr); err == nil {
 		var boxedValue any
 		if boxedValue, err = opt.getSpecialValue(parser, value, opt.targetVar); err == nil {
@@ -56,6 +55,10 @@ func (opt *cliOptionString) parse(parser cliParser, argIndex int, valuePtr *stri
 	}
 	return
 }
+func (opt *cliOptionString) finalCheck() (err error) {
+	currentValue, _ := opt.getTargetVar()
+	return opt.getBase().checkValue(currentValue)
+}
 
 func (cli *CliParser) AddStringOpt(name, short string, targetVar *string, defaultValue string, description string, aliases ...string) OptReference {
 	if cli.optionExists(name, short, aliases) {

opt-version.go

@@ -23,7 +23,7 @@ func (opt *cliOptionVersion) getTemplate() string {
 	return opt.makeOptSimpleTemplate(false, true, "section")
 }
 
-func (opt *cliOptionVersion) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, err error) {
+func (opt *cliOptionVersion) parse(parser cliParser, argIndex int, valuePtr *string) (skipNextArg bool, value string, err error) {
 	var args []string
 	if valuePtr != nil {
 		args = []string{*valuePtr}

opt_test.go

@@ -0,0 +1,143 @@
+package cli
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestOneOptWithEqual(t *testing.T) {
+	var cli CliParser
+	var color string
+	// Always recover from panic to return error before adding options
+	defer func() {
+		if r := recover(); r != nil {
+			if err := r.(error); err != nil {
+				t.Error(err)
+			}
+
+		}
+	}()
+
+	// Define options
+	cli.AddStringOpt("color", "c", &color, "white", "Set color")
+
+	args := []string{
+		"TestOneOptWithEqual",
+		"--color=blue",
+	}
+
+	cli.Init(args, "1.0.0", "TestOneOptWithEqual description")
+	if err := cli.Parse(); err != nil {
+		t.Error(err)
+	} else if color != "blue" {
+		t.Errorf("Expected color blue, got %q", color)
+	}
+}
+
+func addBoxOption(cli *CliParser, boxPtr *[]int) {
+	// Define options
+	optRef := cli.AddIntArrayOpt("box", "b", boxPtr, []int{1, 2, 3, 4}, "Box spec: Left,Width,Top,Height; provide 4 int values")
+	optRef.OnFinalCheck(func(currentValue any) (err error) {
+		if array, ok := currentValue.([]int); ok {
+			if len(array) != 4 {
+				err = fmt.Errorf("--box option requires exactly 4 items, %d provided", len(array))
+			}
+		} else {
+			err = fmt.Errorf("wrong datatype for --box option value")
+		}
+		return
+	})
+}
+
+func testIntArrayOptOk(t *testing.T, n int, args []string, flags ...int16) {
+	var box []int
+	var cli CliParser
+	t.Logf("Arg set n. %d", n)
+	addBoxOption(&cli, &box)
+	cli.Init(args, "1.0.0", "TestIntArrayOpt description", flags...)
+	if err := cli.Parse(); err != nil {
+		t.Error(err)
+	} else if len(box) != 4 {
+		t.Errorf(`Expected 4 items, got %d`, len(box))
+	}
+}
+
+func testIntArrayOptKo(t *testing.T, n int, args []string, msg string, flags ...int16) {
+	var box []int
+	var cli CliParser
+	t.Logf("Arg set n. %d", n)
+	addBoxOption(&cli, &box)
+	cli.Init(args, "1.0.0", "TestIntArrayOpt description", flags...)
+	if err := cli.Parse(); err == nil {
+		t.Errorf("Expected error, got nil")
+	} else if err.Error() != msg {
+		t.Errorf(`Invalid error: %q; expected: %q`, err.Error(), msg)
+	}
+}
+
+func TestIntArrayOpt(t *testing.T) {
+	var args []string
+	// Always recover from panic to return error before adding options
+	defer func() {
+		if r := recover(); r != nil {
+			if err := r.(error); err != nil {
+				t.Error(err)
+			}
+
+		}
+	}()
+
+	n := 0
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box=100,200,150,450",
+	}
+	testIntArrayOptOk(t, n, args)
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box=100,200,150",
+	}
+	testIntArrayOptKo(t, n, args, "--box option requires exactly 4 items, 3 provided")
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box", "100,200,150,450",
+	}
+	testIntArrayOptOk(t, n, args)
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box",
+	}
+	testIntArrayOptKo(t, n, args, `option "box" requires a value`)
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box", "100,200,150",
+		"--box", "450",
+	}
+	testIntArrayOptOk(t, n, args)
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box", "100,200,150",
+		"--box", "450,12",
+	}
+	testIntArrayOptKo(t, n, args, "--box option requires exactly 4 items, 5 provided")
+
+	n++
+	args = []string{
+		"TestIntArrayOpt",
+		"--box", "100,200,150",
+		"--box=100,200,150,450",
+	}
+	testIntArrayOptOk(t, n, args, ResetOnEqualSign)
+}

parser.go

@@ -105,11 +105,11 @@ func (cli *CliParser) parseArg(arg string, index int) (skipNextArg bool, err err
 	for i, optName := range opts {
 		if opt := cli.findOptionByArg(dashes + optName); opt != nil {
 			if equalPresent && i == len(opts)-1 {
-				_, err = opt.parse(cli, index, &value)
+				_, _, err = opt.parse(cli, index, &value)
 			} else if i < len(opts)-1 && opt.requiresValue() {
 				err = errMissingOptionValue(dashes + optName)
 			} else {
-				skipNextArg, err = opt.parse(cli, index, nil)
+				skipNextArg, _, err = opt.parse(cli, index, nil)
 			}
 		} else {
 			err = errUnknownOption(dashes + optName)