function similar to getchar

Question

Is there a Go function similar to C\'s getchar able to handle tab press in console? I want to make some sort of completion in my console app.

Answer 1

1- You may use C.getch():

This works in Windows command line, Reads only one character without Enter:
(Run output binary file inside shell (terminal), not inside pipe or Editor.)

package main

//#include
import "C"

import "fmt"

func main() {
    c := C.getch()
    fmt.Println(c)
}

2- For Linux ( tested on Ubuntu ):

package main

/*
#include 
#include 
#include 
char getch(){
    char ch = 0;
    struct termios old = {0};
    fflush(stdout);
    if( tcgetattr(0, &old) < 0 ) perror("tcsetattr()");
    old.c_lflag &= ~ICANON;
    old.c_lflag &= ~ECHO;
    old.c_cc[VMIN] = 1;
    old.c_cc[VTIME] = 0;
    if( tcsetattr(0, TCSANOW, &old) < 0 ) perror("tcsetattr ICANON");
    if( read(0, &ch,1) < 0 ) perror("read()");
    old.c_lflag |= ICANON;
    old.c_lflag |= ECHO;
    if(tcsetattr(0, TCSADRAIN, &old) < 0) perror("tcsetattr ~ICANON");
    return ch;
}
*/
import "C"

import "fmt"

func main() {
    fmt.Println(C.getch())
    fmt.Println()
}

See:
What is Equivalent to getch() & getche() in Linux?
Why can't I find on Linux?

---

3- Also this works, but needs "Enter":

package main

import (
    "bufio"
    "fmt"
    "os"
)

func main() {
    r := bufio.NewReader(os.Stdin)
    c, err := r.ReadByte()
    if err != nil {
        panic(err)
    }
    fmt.Println(c)
}