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// Package instant implements an addon that executes code whenever it changes
// and shows the result.
package instant
import (
"github.com/elves/elvish/pkg/cli"
"github.com/elves/elvish/pkg/cli/term"
"github.com/elves/elvish/pkg/ui"
)
// Config keeps the configuration for the instant addon.
type Config struct {
// Keybinding.
Binding cli.Handler
// The function to execute code and returns the output.
Execute func(code string) ([]string, error)
}
type widget struct {
Config
app cli.App
textView cli.TextView
lastCode string
lastErr error
}
func (w *widget) Render(width, height int) *term.Buffer {
bb := term.NewBufferBuilder(width).
WriteStyled(cli.ModeLine(" INSTANT ", false)).SetDotHere()
if w.lastErr != nil {
bb.Newline().Write(w.lastErr.Error(), ui.FgRed)
}
buf := bb.Buffer()
if len(buf.Lines) >= height {
buf.TrimToLines(0, height)
return buf
}
bufTextView := w.textView.Render(width, height-len(buf.Lines))
buf.Extend(bufTextView, false)
return buf
}
func (w *widget) Focus() bool { return false }
func (w *widget) Handle(event term.Event) bool {
handled := w.Binding.Handle(event)
if !handled {
codeArea := w.app.CodeArea()
handled = codeArea.Handle(event)
}
w.update(false)
return handled
}
func (w *widget) update(force bool) {
code := w.app.CodeArea().CopyState().Buffer.Content
if code == w.lastCode && !force {
return
}
w.lastCode = code
output, err := w.Execute(code)
w.lastErr = err
if err == nil {
w.textView.MutateState(func(s *cli.TextViewState) {
*s = cli.TextViewState{Lines: output, First: 0}
})
}
}
// Start starts the addon.
func Start(app cli.App, cfg Config) {
if cfg.Execute == nil {
app.Notify("executor is required")
return
}
if cfg.Binding == nil {
cfg.Binding = cli.DummyHandler{}
}
w := widget{
Config: cfg,
app: app,
textView: cli.NewTextView(cli.TextViewSpec{Scrollable: true}),
}
app.MutateState(func(s *cli.State) { s.Addon = &w })
w.update(true)
app.Redraw()
}
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