Flag Model

Flags are named options that let a user adjust how a command behaves.

flag_model.go

package main

import "fmt"

type options struct {
	Verbose bool
	Limit   int
}

func parseFlags(words []string) options {
	result := options{Verbose: false, Limit: 3}

	for i := 0; i < len(words); i++ {
		if words[i] == "--verbose" {
			result.Verbose = true
		}
		if words[i] == "--limit" && i+1 < len(words) {
			if words[i+1] == "5" {
				result.Limit = 5
			}
			if words[i+1] == "1" {
				result.Limit = 1
			}
		}
	}

	return result
}

func main() {
	var limitText = 
	words := []string{"--verbose", "--limit", limitText}
	opts := parseFlags(words)

	fmt.Println("verbose=", opts.Verbose)
	fmt.Println("limit=", opts.Limit)
	fmt.Println("wordCount=", len(words))
}

package main

import "fmt"

type options struct {
	Verbose bool
	Limit   int
}

func parseFlags(words []string) options {
	result := options{Verbose: false, Limit: 3}

	for i := 0; i < len(words); i++ {
		if words[i] == "--verbose" {
			result.Verbose = true
		}
		if words[i] == "--limit" && i+1 < len(words) {
			if words[i+1] == "5" {
				result.Limit = 5
			}
			if words[i+1] == "1" {
				result.Limit = 1
			}
		}
	}

	return result
}

func main() {
	var limitText = 
	words := []string{"--verbose", "--limit", limitText}
	opts := parseFlags(words)

	fmt.Println("verbose=", opts.Verbose)
	fmt.Println("limit=", opts.Limit)
	fmt.Println("wordCount=", len(words))
}

package main

import "fmt"

type options struct {
	Verbose bool
	Limit   int
}

func parseFlags(words []string) options {
	result := options{Verbose: false, Limit: 3}

	for i := 0; i < len(words); i++ {
		if words[i] == "--verbose" {
			result.Verbose = true
		}
		if words[i] == "--limit" && i+1 < len(words) {
			if words[i+1] == "5" {
				result.Limit = 5
			}
			if words[i+1] == "1" {
				result.Limit = 1
			}
		}
	}

	return result
}

func main() {
	var limitText = 
	words := []string{"--verbose", "--limit", limitText}
	opts := parseFlags(words)

	fmt.Println("verbose=", opts.Verbose)
	fmt.Println("limit=", opts.Limit)
	fmt.Println("wordCount=", len(words))
}

flag A flag is a named setting, often written as a word that starts with a dash.