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spinner.go
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spinner.go
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/*
Copyright 2024 The Knative Authors
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 tui
import (
"fmt"
"github.com/charmbracelet/bubbles/spinner"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"go.uber.org/multierr"
"knative.dev/client-pkg/pkg/output"
"knative.dev/client-pkg/pkg/output/term"
)
const spinnerColor = lipgloss.Color("205")
type Spinner interface {
Runnable[Spinner]
}
func (w *widgets) NewSpinner(message string) Spinner {
return &BubbleSpinner{
InputOutput: output.PrinterFrom(w.ctx),
Message: Message{Text: message},
}
}
type BubbleSpinner struct {
output.InputOutput
Message
spin spinner.Model
tea *tea.Program
quitChan chan struct{}
teaErr error
}
func (b *BubbleSpinner) With(fn func(Spinner) error) error {
b.start()
err := func() error {
defer b.stop()
return fn(b)
}()
return multierr.Combine(err, b.teaErr)
}
func (b *BubbleSpinner) Init() tea.Cmd {
return b.spin.Tick
}
func (b *BubbleSpinner) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
m, c := b.spin.Update(msg)
b.spin = m
return b, c
}
func (b *BubbleSpinner) View() string {
return fmt.Sprintf("%s %s", b.Message.Text, b.spin.View())
}
func (b *BubbleSpinner) start() {
b.spin = spinner.New(
spinner.WithSpinner(spinner.Meter),
spinner.WithStyle(spinnerStyle()),
)
out := b.OutOrStdout()
b.tea = tea.NewProgram(b,
tea.WithInput(safeguardBubbletee964(b.InOrStdin())),
tea.WithOutput(out),
)
b.quitChan = make(chan struct{})
go func() {
t := b.tea
if _, err := t.Run(); err != nil {
b.teaErr = err
}
close(b.quitChan)
if term.IsWriterTerminal(out) {
_ = t.ReleaseTerminal()
}
}()
}
func (b *BubbleSpinner) stop() {
if b.tea == nil {
return
}
b.tea.Quit()
<-b.quitChan
b.tea = nil
b.quitChan = nil
endMsg := fmt.Sprintf("%s %s\n",
b.Message.Text, spinnerStyle().Render("Done"))
_, _ = b.OutOrStdout().Write([]byte(endMsg))
}
func spinnerStyle() lipgloss.Style {
return lipgloss.NewStyle().Foreground(spinnerColor)
}