Golang : Command line ticker to show work in progress
Problem:
Your command line application is crunching data and you want your program to show the user that it is working. It is not a progress bar with percentage completion, but just a simple ticker to distract the user's attention. How to do that?
Solution:
Create an array of -
,\
,/
' and -
. Randomly selects one or iterates over the items in the array and display it.
Here you go!
package main
/*
#include <stdio.h>
#include <unistd.h>
#include <termios.h>
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"
"math/rand"
"os"
"time"
)
func main() {
go func() {
key := C.getch() // get single key hit without pressing Enter button
fmt.Println()
fmt.Println("Exiting ...")
if key == 27 {
os.Exit(0)
}
}()
// recording in progress ticker. From good old DOS days.
ticker := []string{
"-",
"\\", //<--- need escape
"/",
"|",
}
rand.Seed(time.Now().UnixNano())
fmt.Println("Press ESC key to quit...")
for {
fmt.Printf("\rProcessing data now! [%v]", ticker[rand.Intn(len(ticker)-1)])
}
}
Run the code and you should see the ticker in action.
It is use in https://socketloop.com/tutorials/golang-save-webcamera-frames-to-video-file as well.
Happy coding!
References:
https://www.socketloop.com/tutorials/golang-overwrite-previous-output-with-count-down-timer
https://socketloop.com/tutorials/golang-randomly-pick-an-item-from-a-slice-array-example
http://stackoverflow.com/questions/14094190/golang-function-similar-to-getchar
See also : Golang : Overwrite previous output with count down timer
By Adam Ng
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