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// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Paul Buetow
package repl
import (
"strings"
"github.com/c-bata/go-prompt"
)
// completer provides auto-completion for built-in commands.
// It returns suggestions for commands that match the current word being typed.
// The matching is case-insensitive and includes descriptions for each command.
//
// This function is typically used as the completer function for the prompt.Prompt.
//
// d: the current prompt.Document containing cursor position and text
// Returns a slice of prompt.Suggest for matching built-in commands
func completer(d prompt.Document) []prompt.Suggest {
text := d.GetWordBeforeCursor()
// Handle edge case where GetWordBeforeCursor returns empty
// This happens in tests when cursor position is not set (defaults to 0)
// In this case, we need to determine the word based on the text content
if text == "" {
// If text ends with space, use the word before the space
trimmed := strings.TrimSpace(d.Text)
if trimmed != "" {
// If text had trailing space, complete the last word
if len(d.Text) > 0 && d.Text[len(d.Text)-1] == ' ' {
// Get the last word before the trailing space
text = trimmed
} else {
// No trailing space, use the full text
text = d.Text
}
}
}
if text == "" {
return nil
}
var suggestions []prompt.Suggest
for _, cmd := range builtinCommands() {
if strings.HasPrefix(strings.ToLower(cmd), strings.ToLower(text)) {
suggestions = append(suggestions, prompt.Suggest{
Text: cmd,
Description: getCommandDescription(cmd),
})
}
}
return suggestions
}
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