add comments to the repl package

pkg/cli/repl/completer.go

@@ -6,23 +6,28 @@ import (
 	"github.com/c-bata/go-prompt"
 )
 
+// completer provides suggestions for the REPL input based on the current input text.
 func completer(d prompt.Document) []prompt.Suggest {
-	text := d.TextBeforeCursor()
-	words := strings.Fields(text)
+	text := d.TextBeforeCursor()  // Gets the text before the cursor as a string.
+	words := strings.Fields(text) // Split the string into words as []string.
 
+	// If there are no words, return no suggestions.
 	if len(words) == 0 {
 		return nil
 	}
 
+	// If the first word is not "pm", only provide root-level suggestions.
 	if words[0] != "pm" {
 		return filterByPrefix(rootSuggestions, words[0])
 	}
 
+	// If the first word is "pm", provide command and flag suggestions based on the context.
 	pmWords := words[1:]
 	if len(words) == 1 || (len(pmWords) == 1 && !strings.HasSuffix(text, " ")) {
 		return commandSuggestions(pmWords)
 	}
 
+	// If the last word starts with a "-", provide flag suggestions for the current command.
 	if len(pmWords) >= 1 {
 		return flagSuggestions(pmWords[0], pmWords, text)
 	}