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