mirror of
https://github.com/wgh136/nysoure.git
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56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
package utils
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import (
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"github.com/gomarkdown/markdown"
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"github.com/gomarkdown/markdown/html"
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"github.com/gomarkdown/markdown/parser"
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"github.com/k3a/html2text"
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"strings"
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)
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func ArticleToDescription(article string, maxLength int) string {
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if maxLength < 3 {
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maxLength = 3
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}
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htmlContent := mdToHTML([]byte(article))
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plain := html2text.HTML2Text(string(htmlContent))
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plain = strings.TrimSpace(plain)
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plain = mergeSpaces(plain)
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if len([]rune(plain)) > maxLength {
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plain = string([]rune(plain)[:(maxLength-3)]) + "..."
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}
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return plain
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}
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func mergeSpaces(str string) string {
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// Replace multiple spaces with a single space
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builder := strings.Builder{}
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for i, r := range str {
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if r == '\t' || r == '\r' {
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continue
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}
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if r == ' ' || r == '\n' {
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if i > 0 && str[i-1] != ' ' && str[i-1] != '\n' {
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builder.WriteRune(' ')
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}
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} else {
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builder.WriteRune(r)
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}
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}
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return builder.String()
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}
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func mdToHTML(md []byte) []byte {
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// create Markdown parser with extensions
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extensions := parser.CommonExtensions | parser.NoEmptyLineBeforeBlock | parser.MathJax
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p := parser.NewWithExtensions(extensions)
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doc := p.Parse(md)
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// create HTML renderer with extensions
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htmlFlags := html.CommonFlags | html.HrefTargetBlank
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opts := html.RendererOptions{Flags: htmlFlags}
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renderer := html.NewRenderer(opts)
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return markdown.Render(doc, renderer)
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}
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