Readline interface: Difference between revisions
Added Go
(Added Go) |
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Line 181:
- readline_interface.hello
>exit</pre>
=={{header|Go}}==
{{trans|D}}
<lang go>package main
import (
"bufio"
"fmt"
"log"
"os"
"strings"
)
type vf = func()
var history []string
func hello() {
fmt.Println("Hello World!")
history = append(history, "hello")
}
func hist() {
if len(history) == 0 {
fmt.Println("No history")
} else {
for _, cmd := range history {
fmt.Println(" -", cmd)
}
}
history = append(history, "hist")
}
func help() {
fmt.Println("Available commands:")
fmt.Println(" hello")
fmt.Println(" hist")
fmt.Println(" exit")
fmt.Println(" help")
history = append(history, "help")
}
func main() {
scanner := bufio.NewScanner(os.Stdin)
vfs := map[string]vf{"help": help, "hist": hist, "hello": hello}
fmt.Println("Enter a command, type help for a listing.")
for {
fmt.Print(">")
scanner.Scan()
if scerr := scanner.Err(); scerr != nil {
log.Fatal(scerr)
}
line := strings.TrimSpace(scanner.Text())
if line == "exit" {
return
}
cmd, ok := vfs[line]
if !ok {
fmt.Println("Unknown command, try again")
} else {
cmd()
}
}
}</lang>
{{out}}
Sample session:
<pre>
Enter a command, type help for a listing.
>hit
Unknown command, try again
>hist
No history
>help
Available commands:
hello
hist
exit
help
>hello
Hello World!
>hist
- hist
- help
- hello
>exit
</pre>
=={{header|Java}}==
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