type Value interface { String() string Set(string) error} 其中String方法格式化该类型的值，flag.Parse方法在执行时遇到自定义类型的选项会将选项值作为参数调用该类型变量的Set方法。如最长被使用到的slice类型可以这么定义：type arrayFlags []stringfunc (i *arrayFlags) String() string { return s...
CommandLine 给的是 os.Args[0]parsedbool// 是否执行过 Parse()actualmap[string]*Flag// 存放实际传递了的参数(即命令行参数)formalmap[string]*Flag// 存放所有已定义命令行参数args []string// arguments after flags // 开始存放所有参数,最后保留 非 flag(non-flag)参数exitOnErrorbool// does the pro...
In addition to this, feature flags can add much more power by actually functioning as a non-binary tool, and allowing you to switch to different behaviors of the application as per the requirement. Likewise, an example in the real world would be the different modes of an air conditioner. ...
FlagSet 就是一组 flag 定义的集合,在 flag 库的底层是一个结构体: typeFlagSetstruct{// Usage is the function called when an error occurs while parsing flags.// The field is a function (not a method) that may be changed to point to// a custom error handler. What happens after Usage is ...
// Usage is the function calledwhen an error occurs while parsing flags. // The field is a function (not a method) that may be changed to point to // a custom error handler. What happens after Usage is called depends // on the ErrorHandling setting; for the command line, this defaul...
flags.StringVar(&config.Cfg.Mode, "mode", "cpu", "mode[cpu or all]") } check 命令实现如下,具体 check 相关的 Run 方法忽略: package check import ( "fmt" log "github.com/sirupsen/logrus" "github.com/spf13/cobra" "example/config" ...
(&inputFlagvar,"flagname",1234,"Help")}funcmain(){Init()flag.Parse()// func Args() []string// Args returns the non-flag command-line arguments.// func NArg() int// NArg is the number of arguments remaining after flags have been processed.fmt.Printf("args=%s, num=%d\n",flag....
1.2.1 定义 flags 有两种方式 1)flag.Xxx(),其中 Xxx 可以是 Int、String,Bool 等;返回一个相应类型的指针,如: 代码语言:javascript 复制 varip=flag.Int("flagname",1234,"help message for flagname") 第一个参数 :flag名称为flagname 第二个参数 :flagname默认值为1234 ...
Command-line flags (flag) Logging (log) Thereversereverse covers: The basic form of a library Conversion between string and []rune Table-driven unit tests (testing) helloserver $ cd helloserver $ go run . A trivial "Hello, world" web server. ...
golang 中可以使用 os.Args 进行 命令行参数的处理。 os 包 os.Args 是一个字符串数组, 其中下标位0 的是调用的程序本身。 flag包关于命令行参数的使用 Go 提供了一个 flag 包,支持基本的命令行标志解析。。 基本的标记声明仅支持字符串、整数和布尔值选项。