1 files changed, 85 insertions, 0 deletions
diff --git a/internal/comic/helpers.go b/internal/comic/helpers.go
new file mode 100644
index 0000000..0458db5
--- /dev/null
+++ b/internal/comic/helpers.go
@@ -0,0 +1,85 @@
+package comic
+
+import (
+	"strings"
+)
+
+// slugify converts a comic title into a safe file-name component.
+func slugify(title string) string {
+	title = strings.ToLower(strings.TrimSpace(title))
+	var b strings.Builder
+	prevHyphen := false
+	for _, r := range title {
+		switch {
+		case r >= 'a' && r <= 'z', r >= '0' && r <= '9':
+			b.WriteRune(r)
+			prevHyphen = false
+		case r == ' ' || r == '-' || r == '_':
+			if !prevHyphen && b.Len() > 0 {
+				b.WriteByte('-')
+				prevHyphen = true
+			}
+		}
+	}
+
+	slug := strings.TrimRight(b.String(), "-")
+	if slug == "" {
+		return "comic"
+	}
+	return slug
+}
+
+// splitIntoSections divides text into n sections, preferring paragraph boundaries.
+func splitIntoSections(text string, n int) []string {
+	paragraphs := splitParagraphs(text)
+	if len(paragraphs) >= n {
+		return distributeParagraphs(paragraphs, n)
+	}
+	return splitByChars(text, n)
+}
+
+// splitParagraphs returns non-empty paragraphs separated by blank lines.
+func splitParagraphs(text string) []string {
+	var out []string
+	for _, paragraph := range strings.Split(text, "\n\n") {
+		if paragraph = strings.TrimSpace(paragraph); paragraph != "" {
+			out = append(out, paragraph)
+		}
+	}
+	return out
+}
+
+func distributeParagraphs(paragraphs []string, n int) []string {
+	sections := make([]string, n)
+	size, rem, idx := len(paragraphs)/n, len(paragraphs)%n, 0
+	for i := range n {
+		count := size
+		if i < rem {
+			count++
+		}
+		sections[i] = strings.Join(paragraphs[idx:idx+count], "\n\n")
+		idx += count
+	}
+	return sections
+}
+
+func splitByChars(text string, n int) []string {
+	size := len(text) / n
+	sections := make([]string, n)
+	for i := range n {
+		start := i * size
+		end := start + size
+		if i == n-1 {
+			end = len(text)
+		}
+		sections[i] = strings.TrimSpace(text[start:end])
+	}
+	return sections
+}
+
+func orDefault(value, fallback string) string {
+	if strings.TrimSpace(value) != "" {
+		return value
+	}
+	return fallback
+}