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// Command e3bc ("Elvish-editor-enhanced bc") is a wrapper for the bc command
// that uses Elvish's cli library for an enhanced CLI experience.
package main
import (
"fmt"
"io"
"unicode"
"src.elv.sh/pkg/cli"
"src.elv.sh/pkg/cli/examples/e3bc/bc"
"src.elv.sh/pkg/cli/modes"
"src.elv.sh/pkg/cli/term"
"src.elv.sh/pkg/cli/tk"
"src.elv.sh/pkg/diag"
"src.elv.sh/pkg/ui"
)
// A highlighter for bc code. Currently this just makes all digits green.
//
// TODO: Highlight more syntax of bc.
type highlighter struct{}
func (highlighter) Get(code string) (ui.Text, []ui.Text) {
t := ui.Text{}
for _, r := range code {
var style ui.Styling
if unicode.IsDigit(r) {
style = ui.FgGreen
}
t = append(t, ui.T(string(r), style)...)
}
return t, nil
}
func (highlighter) LateUpdates() <-chan struct{} { return nil }
func main() {
var app cli.App
app = cli.NewApp(cli.AppSpec{
Prompt: cli.NewConstPrompt(ui.T("bc> ")),
Highlighter: highlighter{},
CodeAreaBindings: tk.MapBindings{
term.K('D', ui.Ctrl): func(tk.Widget) { app.CommitEOF() },
term.K(ui.Tab): func(w tk.Widget) {
codearea := w.(tk.CodeArea)
if codearea.CopyState().Buffer.Content != "" {
// Only complete with an empty buffer
return
}
w, err := modes.NewCompletion(app, modes.CompletionSpec{
Replace: diag.Ranging{From: 0, To: 0}, Items: candidates(),
})
if err == nil {
app.PushAddon(w)
}
},
},
GlobalBindings: tk.MapBindings{
term.K('[', ui.Ctrl): func(tk.Widget) { app.PopAddon() },
},
})
bc := bc.Start()
defer bc.Quit()
for {
code, err := app.ReadCode()
if err != nil {
if err != io.EOF {
fmt.Println("error:", err)
}
break
}
bc.Exec(code)
}
}
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