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import ( "context" "errors" "fmt" "io" "strings")
const ( titledDraftSentinel = "<!-- tg: everything below this line is ignored -->" titledDraftTemplate = "\n\n" + titledDraftSentinel + "\n" + "<!-- Enter a title above, followed by a blank line and an optional body. -->\n" issueDraftTemplate = "\n\n" + titledDraftSentinel + "\n" + "<!-- Enter a title above, followed by a blank line and an optional body. -->\n")
var errTitledDraftCanceled = errors.New("title and body creation canceled")
type titledDraft struct { Title string Body string Path string}
func editTitledDraft(ctx context.Context, kind, pattern, template string, input io.Reader, output, errorOutput io.Writer) (titledDraft, error) { edited, err := editDraft(ctx, kind, pattern, template, input, output, errorOutput) if err != nil { return titledDraft{}, err } title, body, err := parseTitledDraft(edited.Contents) if errors.Is(err, errTitledDraftCanceled) { removeDraft(edited.Path, kind, errorOutput) return titledDraft{}, err } if err != nil { return titledDraft{}, fmt.Errorf("parse %s draft: %w; draft saved to %s", kind, err, edited.Path) } return titledDraft{Title: title, Body: body, Path: edited.Path}, nil}
func editIssueDraft(ctx context.Context, input io.Reader, output, errorOutput io.Writer) (titledDraft, error) { return editTitledDraft(ctx, "issue", "tg-issue-*.md", issueDraftTemplate, input, output, errorOutput)}
func parseTitledDraft(document string) (string, string, error) { document = strings.ReplaceAll(document, "\r\n", "\n") lines := strings.Split(document, "\n") for index, line := range lines { if line == titledDraftSentinel { lines = lines[:index] break } } document = strings.Join(lines, "\n") if strings.TrimSpace(document) == "" { return "", "", errTitledDraftCanceled }
titleLine, remainder, found := strings.Cut(document, "\n") if !found { return "", "", fmt.Errorf("title must be followed by an empty line") } blankLine, body, found := strings.Cut(remainder, "\n") if !found { blankLine = remainder body = "" } if blankLine != "" { return "", "", fmt.Errorf("second line must be empty") } title := strings.TrimSpace(titleLine) if title == "" { return "", "", fmt.Errorf("title must not be empty") } return title, strings.Trim(body, "\n"), nil}
func removeTitledDraft(path, kind string, errorOutput io.Writer) { removeDraft(path, kind, errorOutput)}