83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package progress
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import (
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"bytes"
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"fmt"
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)
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// TODO(stevvooe): We may want to support more interesting parameterization of
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// the bar. For now, it is very simple.
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// Bar provides a very simple progress bar implementation.
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//
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// Use with fmt.Printf and "r" to format the progress bar. A "-" flag makes it
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// progress from right to left.
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type Bar float64
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var _ fmt.Formatter = Bar(1.0)
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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 > 1.0 {
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h = 1.0
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}
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if h < 0.0 {
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h = 0.0
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}
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if state.Flag('-') {
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h = 1.0 - 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:], []byte(green))
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n += copy(p[n:], bytes.Repeat([]byte("+"), positive))
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n += copy(p[n:], []byte(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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