Deliver shell completion query replies

completion_query.go

@@ -0,0 +1,53 @@
+package commandkit
+
+import (
+	"errors"
+	"io"
+	"strings"
+
+	internalcobra "gitea.maximumdirect.net/eric/CommandKit/internal/cobra"
+	commandmeta "gitea.maximumdirect.net/eric/CommandKit/internal/commandmeta"
+)
+
+func completeRequest(snapshot *routingSnapshot, words []string) (commandmeta.CompletionResult, error) {
+	if len(words) == 0 {
+		return commandmeta.CompletionResult{}, errors.New("completion request has no current word")
+	}
+	context := resolveCompletionContext(snapshot, words[:len(words)-1], words[len(words)-1])
+	target := completionTargetFor(snapshot, context)
+	result := commandmeta.CompletionResult{Prefix: target.prefix}
+	switch target.kind {
+	case completionTargetCommands, completionTargetFlags:
+		result.Kind = commandmeta.CompletionChoices
+		result.Choices = target.choices
+	case completionTargetValue, completionTargetOperand:
+		result.Kind = target.hint.Kind
+		if target.hint.Kind == commandmeta.CompletionChoices {
+			for _, choice := range target.hint.Choices {
+				if strings.HasPrefix(choice.Value, target.valuePrefix) {
+					result.Choices = append(result.Choices, choice)
+				}
+			}
+		}
+	}
+	return result, nil
+}
+
+func (current *execution) complete(words []string) Outcome {
+	result, err := completeRequest(current.snapshot, words)
+	var reply string
+	if err == nil {
+		reply, err = internalcobra.CompletionReply(result)
+	}
+	if err != nil {
+		reply = internalcobra.CompletionErrorReply()
+	}
+	_ = current.reporter.RenderOutput(func(writer io.Writer) error {
+		_, writeErr := io.WriteString(writer, reply)
+		return writeErr
+	})
+	if err != nil {
+		return current.reporter.finalize(Failure("Could not complete the shell request.").WithCause(err), nil)
+	}
+	return current.reporter.finalize(Success(), nil)
+}