Go flag

The flag package is used for parsing command-line parameters, making it much simpler to develop command-line tools than relying on the rudimentary os.Args.

Method 1: flag.Type(flagName, defaultValue, usage) *Type - This method returns a pointer to the corresponding type.

Method 2: flag.TypeVar(p *Type, flagName, defaultValue, usage) - This method accepts a pointer to the variable that will hold the flag's value.

After defining the command-line flags, you need to call flag.Parse() to parse the command-line arguments. Supported command-line argument formats：

1. -flag xxx （using a space, with one -）
2. --flag xxx （using a space, with two -）
3. -flag=xxx （using an =, with one -）
4. --flag=xxx （using an =, with two -）

var project, worker string

flag.StringVar(&project, "project", "", "Project's name")
flag.StringVar(&worker, "worker", "", "Worker's name")

flag.Parse()

#$ go run consumer.go --help
# -project string
#       Project's name
# -worker string
#      Worker's name

The flag package automatically handles these formats, allowing users to provide command-line parameters in a flexible manner. Once flag.Parse() is called, the flags and their values can be accessed through the variables or pointers defined during flag creation.

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