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progressbar.go
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/
progressbar.go
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package toolbox
//
//Copyright 2019 Telenor Digital AS
//
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
//http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//
import (
"fmt"
"strings"
)
const progressWidth = 80
// ConsoleProgress prints an 80-character progress bar on the console for values
// between [0, Max]
type ConsoleProgress struct {
Max int
Current int
}
// Print prints a 80-character wide progress bar on the console.
func (c *ConsoleProgress) Print(val int) {
if val > c.Max {
val = c.Max
}
pos := (float64(val) / float64(c.Max)) * float64(progressWidth-2)
newVal := int(pos)
if newVal == c.Current {
// nothing to print since there's no change
return
}
c.Current = newVal
str := []byte(fmt.Sprintf("[%s]", strings.Repeat(" ", progressWidth-2)))
str[0] = byte('[')
str[progressWidth-1] = ']'
for i := 1; i <= c.Current; i++ {
str[i] = '='
}
fmt.Printf("%s\r", string(str))
if c.Current == (progressWidth - 2) {
fmt.Println()
}
}