73 lines
1.0 KiB
Go
73 lines
1.0 KiB
Go
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
const (
|
|
escape = "\x1b"
|
|
reset = escape + "[0m"
|
|
green = escape + "[32m"
|
|
)
|
|
|
|
// Bar is a progress bar.
|
|
type Bar float64
|
|
|
|
var _ fmt.Formatter = Bar(1.0)
|
|
|
|
// Format the progress bar as output
|
|
func (h Bar) Format(state fmt.State, r rune) {
|
|
switch r {
|
|
case 'r':
|
|
default:
|
|
panic(fmt.Sprintf("%v: unexpected format character", float64(h)))
|
|
}
|
|
|
|
if h > 1.0 {
|
|
h = 1.0
|
|
}
|
|
|
|
if h < 0.0 {
|
|
h = 0.0
|
|
}
|
|
|
|
if state.Flag('-') {
|
|
h = 1.0 - h
|
|
}
|
|
|
|
width, ok := state.Width()
|
|
if !ok {
|
|
// default width of 40
|
|
width = 40
|
|
}
|
|
|
|
var pad int
|
|
|
|
extra := len([]byte(green)) + len([]byte(reset))
|
|
|
|
p := make([]byte, width+extra)
|
|
p[0], p[len(p)-1] = '|', '|'
|
|
pad += 2
|
|
|
|
positive := int(Bar(width-pad) * h)
|
|
negative := width - pad - positive
|
|
|
|
n := 1
|
|
n += copy(p[n:], green)
|
|
n += copy(p[n:], bytes.Repeat([]byte("+"), positive))
|
|
n += copy(p[n:], reset)
|
|
|
|
if negative > 0 {
|
|
copy(p[n:len(p)-1], bytes.Repeat([]byte("-"), negative))
|
|
}
|
|
|
|
_, _ = state.Write(p)
|
|
}
|
|
|
|
func main() {
|
|
var b Bar = 0.9
|
|
_, _ = fmt.Fprintf(os.Stdout, "%r", b)
|
|
}
|