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progressdots.go
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progressdots.go
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/*
Copyright (C) 2017 Red Hat, Inc.
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.
*/
package progressdots
import (
"fmt"
"io"
"os"
"time"
)
const (
DefaultInterval = 2 * time.Second
DefaultEasing = 10
)
type ProgressDots struct {
interval time.Duration
easing int
dotCounter int
handler chan bool
out io.Writer
}
// New creates the channel to handle progress dots
// It takes easingOptional as optional parameter to control dots interval
func New(easingOptional ...int) *ProgressDots {
easing := DefaultEasing
if len(easingOptional) > 0 {
easing = easingOptional[0]
}
return &ProgressDots{
interval: DefaultInterval,
easing: easing,
dotCounter: 0,
handler: make(chan bool),
out: os.Stdout,
}
}
// Start starts the dots
func (s *ProgressDots) Start() {
go func() {
for {
select {
case <-s.handler:
return
default:
fmt.Fprint(s.out, ".")
s.dotCounter++
time.Sleep(s.interval)
if s.easing != 0 && s.dotCounter%s.easing == 0 {
s.dotCounter = 0
s.interval = s.interval + 1*time.Second
}
}
}
}()
}
// Stop stops the dots
func (s *ProgressDots) Stop() {
defer close(s.handler)
s.handler <- true
}
// SetInterval sets the interval
func (s *ProgressDots) SetInterval(interval time.Duration) {
s.interval = interval
}
// SetWriter sets the writer for the output
func (s *ProgressDots) SetWriter(out io.Writer) {
s.out = out
}