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package showcase
import "strings"
func extractUsefulSummary(text string, maxParagraphs int) string {
if maxParagraphs <= 0 {
maxParagraphs = 1
}
parts := splitSummaryParagraphs(text)
useful := make([]string, 0, maxParagraphs)
for _, part := range parts {
part = normalizeSummaryParagraph(part)
if part == "" {
continue
}
useful = append(useful, part)
if len(useful) >= maxParagraphs {
break
}
}
return strings.Join(useful, "\n\n")
}
func normalizeSummaryParagraph(paragraph string) string {
rawParagraph := strings.TrimSpace(paragraph)
switch {
case isHeadingOnlyParagraph(rawParagraph):
return ""
case isImageOnlyParagraph(rawParagraph):
return ""
case isHTMLOnlyParagraph(rawParagraph):
return ""
case isTOCParagraph(rawParagraph):
return ""
case isListOnlyParagraph(rawParagraph):
return ""
case isBadgeParagraph(rawParagraph):
return ""
}
paragraph = sanitizeSummaryForGemtext(paragraph)
if paragraph == "" {
return ""
}
if normalized, ok := normalizeManpageParagraph(paragraph); ok {
paragraph = normalized
}
if isLabelOnlyParagraph(paragraph) {
return ""
}
return paragraph
}
func splitSummaryParagraphs(text string) []string {
text = strings.ReplaceAll(text, "\r\n", "\n")
text = strings.TrimSpace(text)
if text == "" {
return nil
}
rawParts := strings.Split(text, "\n\n")
parts := make([]string, 0, len(rawParts))
for _, part := range rawParts {
part = strings.TrimSpace(part)
if part == "" {
continue
}
parts = append(parts, part)
}
return parts
}
func sanitizeSummaryForGemtext(summary string) string {
summary = strings.ReplaceAll(summary, "\r\n", "\n")
summary = strings.TrimSpace(summary)
if summary == "" {
return ""
}
lines := strings.Split(summary, "\n")
cleaned := make([]string, 0, len(lines))
inCodeFence := false
for _, line := range lines {
trimmed := strings.TrimSpace(line)
if trimmed == "" {
if inCodeFence {
continue
}
cleaned = append(cleaned, "")
continue
}
if strings.HasPrefix(trimmed, "```") {
inCodeFence = !inCodeFence
continue
}
if inCodeFence {
continue
}
if isHTMLOnlyLine(trimmed) || isMarkdownImageLine(trimmed) {
continue
}
if isSetextUnderline(trimmed) && len(cleaned) > 0 && strings.TrimSpace(cleaned[len(cleaned)-1]) != "" {
continue
}
if heading, ok := trimMarkdownHeading(trimmed); ok {
if heading != "" {
cleaned = append(cleaned, heading)
}
continue
}
cleaned = append(cleaned, strings.TrimRight(line, " \t"))
}
return strings.TrimSpace(strings.Join(cleaned, "\n"))
}
func isHeadingOnlyParagraph(paragraph string) bool {
lines := strings.Split(strings.TrimSpace(strings.ReplaceAll(paragraph, "\r\n", "\n")), "\n")
if len(lines) == 1 {
_, ok := trimMarkdownHeading(strings.TrimSpace(lines[0]))
return ok
}
if len(lines) == 2 {
return strings.TrimSpace(lines[0]) != "" && isSetextUnderline(strings.TrimSpace(lines[1]))
}
return false
}
func isImageOnlyParagraph(paragraph string) bool {
trimmed := strings.TrimSpace(paragraph)
if trimmed == "" || strings.Contains(trimmed, "\n") {
return false
}
return strings.HasPrefix(trimmed, "<img") || strings.HasPrefix(trimmed, "![")
}
func isHTMLOnlyParagraph(paragraph string) bool {
lines := strings.Split(strings.TrimSpace(paragraph), "\n")
if len(lines) == 0 {
return false
}
seen := false
for _, line := range lines {
trimmed := strings.TrimSpace(line)
if trimmed == "" {
continue
}
if !isHTMLOnlyLine(trimmed) {
return false
}
seen = true
}
return seen
}
func isHTMLOnlyLine(line string) bool {
return strings.HasPrefix(line, "<") && strings.HasSuffix(line, ">")
}
func isMarkdownImageLine(line string) bool {
return strings.HasPrefix(line, "![") && strings.Contains(line, "](")
}
func isTOCParagraph(paragraph string) bool {
lines := strings.Split(strings.TrimSpace(paragraph), "\n")
if len(lines) == 0 {
return false
}
first := strings.TrimSpace(lines[0])
if !strings.EqualFold(first, "toc:") && !strings.EqualFold(first, "table of contents:") {
return false
}
for _, line := range lines[1:] {
trimmed := strings.TrimSpace(line)
if trimmed == "" {
continue
}
if !isOrderedListLine(trimmed) {
return false
}
}
return true
}
func isListOnlyParagraph(paragraph string) bool {
lines := strings.Split(strings.TrimSpace(paragraph), "\n")
if len(lines) == 0 {
return false
}
seen := false
for _, line := range lines {
trimmed := strings.TrimSpace(line)
if trimmed == "" {
continue
}
if !isListLine(trimmed) {
return false
}
seen = true
}
return seen
}
func isListLine(line string) bool {
return strings.HasPrefix(line, "* ") || strings.HasPrefix(line, "- ") || isOrderedListLine(line)
}
func isOrderedListLine(line string) bool {
if line == "" || line[0] < '0' || line[0] > '9' {
return false
}
i := 0
for i < len(line) && line[i] >= '0' && line[i] <= '9' {
i++
}
if i == 0 || i >= len(line) {
return false
}
if (line[i] != '.' && line[i] != ')') || i+1 >= len(line) || line[i+1] != ' ' {
return false
}
return true
}
func isLabelOnlyParagraph(paragraph string) bool {
lines := strings.Split(strings.TrimSpace(paragraph), "\n")
if len(lines) != 1 {
return false
}
line := strings.TrimSpace(lines[0])
if line == "" {
return false
}
if strings.HasSuffix(line, ":") && len(strings.Fields(line)) <= 5 {
return true
}
return line == strings.ToUpper(line) && len(strings.Fields(line)) <= 4
}
func isBadgeParagraph(paragraph string) bool {
lines := strings.Split(strings.TrimSpace(paragraph), "\n")
if len(lines) != 1 {
return false
}
line := strings.TrimSpace(lines[0])
if line == "" {
return false
}
markerCount := strings.Count(line, "](") + strings.Count(line, "![")
return markerCount >= 2
}
func normalizeManpageParagraph(paragraph string) (string, bool) {
lines := strings.Split(strings.TrimSpace(paragraph), "\n")
if len(lines) < 2 {
return "", false
}
if strings.TrimSpace(lines[0]) != "NAME" {
return "", false
}
body := make([]string, 0, len(lines)-1)
for _, line := range lines[1:] {
trimmed := strings.TrimSpace(line)
if trimmed == "" {
continue
}
body = append(body, trimmed)
}
if len(body) == 0 {
return "", false
}
return strings.Join(body, " "), true
}
func trimMarkdownHeading(line string) (string, bool) {
if line == "" || !strings.HasPrefix(line, "#") {
return "", false
}
level := 0
for level < len(line) && line[level] == '#' {
level++
}
if level == 0 || level > 6 {
return "", false
}
if level < len(line) && line[level] != ' ' && line[level] != '\t' {
return "", false
}
heading := strings.TrimSpace(line[level:])
heading = strings.TrimSpace(strings.TrimRight(heading, "#"))
return heading, true
}
func isSetextUnderline(line string) bool {
if len(line) < 3 {
return false
}
return strings.Trim(line, "=") == "" || strings.Trim(line, "-") == ""
}
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