英文:
How can I access an array of commands w/ Cli in Go?
问题
当前正在使用Codegangsta的Cli库。我运行的命令如下：
myGoProgram arg1 arg2 arg3 --flag1 flag1arg
运行
app.Action = func(c *cli.Context) {
fmt.Println("Context: ", c.Args())
}
返回：[arg1 arg2 arg3 --flag1 flag1arg]（c.Args()的返回类型）
我如何访问arg1、arg2和arg3，但不包括--flag1或flag1arg？我需要遍历这个数组吗？
英文:
Currently using Codegangsta's Cli Library. I run a command like so:
myGoProgram arg1 arg2 arg3 --flag1 flag1arg
Running
app.Action = func(c *cli.Context) {
fmt.Println("Context: ", c.Args())
}
returns: [arg1 arg2 arg3 --flag1 flag1arg] (c.Args()'s return type)
How can I access arg1, arg2, and arg3, but not --flag1 or flag1arg? Do I have to iterate through this array?
答案1
得分: 0
好的，我会为你翻译这段代码：
func noFlagCliArgs(cliArgs []string) []string {
a := cliArgs
for pos, arg := range cliArgs {
if strings.Compare(string(arg[0]), "-") == 0 {
// 去掉两个元素，以消除标志和其参数
a = append(a[:pos], a[pos+2:]...)
}
}
return a
}
这段代码的作用是创建两个具有相同内容的数组，并根据需要删除元素，以创建一个只包含原始命令的数组。
英文:
Ok, so what I did was create two arrays of the same contents and just removed elements accordingly to create an array of only the raw commands.
func noFlagCliArgs(cliArgs []string) []string {
a := cliArgs
for pos, arg := range cliArgs {
if strings.Compare(string(arg[0]), "-") == 0 {
// Cut out two to get rid of flag and its argument
a = append(a[:pos], a[pos+2:]...)
}
}
return a
}
答案2
得分: 0
我认为你可能没有正确定义你的标志，看看我准备的这个示例：
package main
import (
"fmt"
"os"
"github.com/codegangsta/cli"
)
func main() {
app := cli.NewApp()
app.Name = "so-example"
app.Usage = "演示CLI用法"
app.Commands = []cli.Command{
{
Name: "one",
Usage: "第一件事",
Flags: []cli.Flag{
cli.StringFlag{
Name: "test",
Value: "foobar",
Usage: "一些很酷的东西",
},
},
Action: func(c *cli.Context) {
fmt.Println("完成任务", c.Command.Name, "带参数", c.Args())
if c.String("test") != "foobar" {
fmt.Println("foobar去哪了？")
}
},
},
{
Name: "two",
Usage: "第二件事",
Flags: []cli.Flag{
cli.StringFlag{
Name: "test",
Value: "foobar",
Usage: "一些很酷的东西",
},
},
Action: func(c *cli.Context) {
fmt.Println("完成任务", c.Command.Name, "带参数", c.Args())
fmt.Println("测试值:", c.String("test"))
if c.String("test") != "foobar" {
fmt.Println("foobar去哪了？")
}
},
},
}
app.Run(os.Args)
}
快速示例：
无标志
$ ./sandbox two foo bar hello world
完成任务 two 带参数 [foo bar hello world]
测试值: foobar
使用标志
$ ./sandbox two foo bar hello world --test "see"
完成任务 two 带参数 [foo bar hello world]
测试值: see
foobar去哪了？
英文:
I think you might not have your flags defined correctly, see this example I cooked up:
package main
import (
"fmt"
"os"
"github.com/codegangsta/cli"
)
func main() {
app := cli.NewApp()
app.Name = "so-example"
app.Usage = "Demonstrate CLI usage"
app.Commands = []cli.Command{
{
Name: "one",
Usage: "first thing",
Flags: []cli.Flag{
cli.StringFlag{
Name: "test",
Value: "foobar",
Usage: "something cool",
},
},
Action: func(c *cli.Context) {
fmt.Println("completed task", c.Command.Name, " with args ", c.Args())
if (c.String("test") != "foobar") {
fmt.Println("Where'd foobar go?")
}
},
},
{
Name: "two",
Usage: "second thing",
Flags: []cli.Flag{
cli.StringFlag{
Name: "test",
Value: "foobar",
Usage: "something cool",
},
},
Action: func(c *cli.Context) {
fmt.Println("completed task", c.Command.Name, " with args ", c.Args())
fmt.Println("Testing value:", c.String("test"))
if (c.String("test") != "foobar") {
fmt.Println("Where'd foobar go?")
}
},
},
}
app.Run(os.Args)
}
Quick examples:
Without flag
$ ./sandbox two foo bar hello world
completed task two with args [foo bar hello world]
Testing value: foobar
With flag
$ ./sandbox two foo bar hello world --test "see"
completed task two with args [foo bar hello world]
Testing value: see
Where'd foobar go?
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