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// Package lastcmd implements an addon that supports inserting the last command
// or words from it.
package lastcmd
import (
"fmt"
"strconv"
"strings"
"github.com/elves/elvish/pkg/cli"
"github.com/elves/elvish/pkg/cli/histutil"
"github.com/elves/elvish/pkg/store"
"github.com/elves/elvish/pkg/ui"
)
// Config is the configuration for starting lastcmd.
type Config struct {
// Binding provides key binding.
Binding cli.Handler
// Store provides the source for the last command.
Store Store
// Wordifier breaks a command into words.
Wordifier func(string) []string
}
// Store wraps the LastCmd method. It is a subset of histutil.Store.
type Store interface {
LastCmd() (store.Cmd, error)
}
var _ = Store(histutil.Store(nil))
// Start starts lastcmd function.
func Start(app cli.App, cfg Config) {
if cfg.Store == nil {
app.Notify("no history store")
return
}
cmd, err := cfg.Store.LastCmd()
if err != nil {
app.Notify("db error: " + err.Error())
return
}
wordifier := cfg.Wordifier
if wordifier == nil {
wordifier = strings.Fields
}
cmdText := cmd.Text
words := wordifier(cmdText)
entries := make([]entry, len(words)+1)
entries[0] = entry{content: cmdText}
for i, word := range words {
entries[i+1] = entry{strconv.Itoa(i), strconv.Itoa(i - len(words)), word}
}
accept := func(text string) {
app.CodeArea().MutateState(func(s *cli.CodeAreaState) {
s.Buffer.InsertAtDot(text)
})
app.MutateState(func(s *cli.State) { s.Addon = nil })
}
w := cli.NewComboBox(cli.ComboBoxSpec{
CodeArea: cli.CodeAreaSpec{Prompt: cli.ModePrompt(" LASTCMD ", true)},
ListBox: cli.ListBoxSpec{
OverlayHandler: cfg.Binding,
OnAccept: func(it cli.Items, i int) {
accept(it.(items).entries[i].content)
},
},
OnFilter: func(w cli.ComboBox, p string) {
items := filter(entries, p)
if len(items.entries) == 1 {
accept(items.entries[0].content)
} else {
w.ListBox().Reset(items, 0)
}
},
})
app.MutateState(func(s *cli.State) { s.Addon = w })
app.Redraw()
}
type items struct {
negFilter bool
entries []entry
}
type entry struct {
posIndex string
negIndex string
content string
}
func filter(allEntries []entry, p string) items {
if p == "" {
return items{false, allEntries}
}
var entries []entry
negFilter := strings.HasPrefix(p, "-")
for _, entry := range allEntries {
if (negFilter && strings.HasPrefix(entry.negIndex, p)) ||
(!negFilter && strings.HasPrefix(entry.posIndex, p)) {
entries = append(entries, entry)
}
}
return items{negFilter, entries}
}
func (it items) Show(i int) ui.Text {
index := ""
entry := it.entries[i]
if it.negFilter {
index = entry.negIndex
} else {
index = entry.posIndex
}
// NOTE: We now use a hardcoded width of 3 for the index, which will work as
// long as the command has less than 1000 words (when filter is positive) or
// 100 words (when filter is negative).
return ui.T(fmt.Sprintf("%3s %s", index, entry.content))
}
func (it items) Len() int { return len(it.entries) }
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