Terminal control/Restricted width positional input/No wrapping: Difference between revisions
Terminal control/Restricted width positional input/No wrapping (view source)
Revision as of 12:05, 7 November 2018
, 5 years agoAdded Go
(Added Go) |
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Line 13:
[[Category:Terminal control]]
=={{header|Go}}==
{{works with|Windows 10}}
{{trans|Kotlin}}
<br>
This uses _getch() rather than _getwch() as only ASCII is supported.
<lang go>
package main
/*
#include <windows.h>
#include <conio.h>
*/
import "C"
import (
"fmt"
"os"
"os/exec"
)
var conOut = C.GetStdHandle(C.STD_OUTPUT_HANDLE)
func setCursor(p C.COORD) {
C.SetConsoleCursorPosition(conOut, p)
}
func cls() {
cmd := exec.Command("cmd", "/c", "cls")
cmd.Stdout = os.Stdout
cmd.Run()
}
func getInput(row, col, width int) string {
if row < 0 || row > 20 || col < 0 || width < 1 || width > 78 || col > (79 - width) {
panic("Invalid parameter(s) to getInput. Terminating program")
}
coord := C.COORD{C.short(col), C.short(row)}
setCursor(coord)
var sb []byte
full := false
loop:
for {
ch := C._getch() // gets next character, no echo
switch c := byte(ch); c {
case 3, 13:
break loop // break on Ctrl-C or enter key
case 8:
if len(sb) > 0 { // mimic backspace
fmt.Print("\b \b")
sb = sb[:len(sb) - 1]
}
case 0, 224:
C._getch() // consume extra character
default:
if c >= 32 && c <= 126 && !full {
C._putch(ch) // echo ascii character, ignore others
sb = append(sb, c)
}
}
full = len(sb) == width // can't exceed width
}
return string(sb)
}
func main() {
cls() // clear the console
s := getInput(2, 4, 8) // Windows console row/col numbering starts at 0
coord := C.COORD{0, 22}
setCursor(coord)
fmt.Printf("You entered '%s'\n", s)
}
</lang>
=={{header|Kotlin}}==
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