Terminal-based user interface toolkit
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package main
import (
"encoding/json"
"net/http"
"net/url"
"strings"
"sync"
"github.com/gdamore/tcell/v2"
"gitlab.com/tslocum/cview"
)
type company struct {
Name string `json:"name"`
}
func main() {
app := cview.NewApplication()
inputField := cview.NewInputField().
SetLabel("Enter a company name: ").
SetFieldWidth(30).
SetDoneFunc(func(key tcell.Key) {
app.Stop()
})
// Set up autocomplete function.
var mutex sync.Mutex
prefixMap := make(map[string][]string)
inputField.SetAutocompleteFunc(func(currentText string) []string {
// Ignore empty text.
prefix := strings.TrimSpace(strings.ToLower(currentText))
if prefix == "" {
return nil
}
// Do we have entries for this text already?
mutex.Lock()
defer mutex.Unlock()
entries, ok := prefixMap[prefix]
if ok {
return entries
}
// No entries yet. Issue a request to the API in a goroutine.
go func() {
// Ignore errors in this demo.
url := "https://autocomplete.clearbit.com/v1/companies/suggest?query=" + url.QueryEscape(prefix)
res, err := http.Get(url)
if err != nil {
return
}
// Store the result in the prefix map.
var companies []*company
dec := json.NewDecoder(res.Body)
if err := dec.Decode(&companies); err != nil {
return
}
entries := make([]string, 0, len(companies))
for _, c := range companies {
entries = append(entries, c.Name)
}
mutex.Lock()
prefixMap[prefix] = entries
mutex.Unlock()
// Trigger an update to the input field.
inputField.Autocomplete()
// Also redraw the screen.
app.Draw()
}()
return nil
})
if err := app.SetRoot(inputField, true).Run(); err != nil {
panic(err)
}
}