refactor: eiblog

pkg/cache/render/render.go

@@ -0,0 +1,94 @@
+// Package render provides ...
+package render
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/eiblog/eiblog/v2/pkg/config"
+	"github.com/eiblog/eiblog/v2/pkg/model"
+
+	"github.com/eiblog/blackfriday"
+)
+
+// blackfriday 配置
+const (
+	commonHtmlFlags = 0 |
+		blackfriday.HTML_TOC |
+		blackfriday.HTML_USE_XHTML |
+		blackfriday.HTML_USE_SMARTYPANTS |
+		blackfriday.HTML_SMARTYPANTS_FRACTIONS |
+		blackfriday.HTML_SMARTYPANTS_DASHES |
+		blackfriday.HTML_SMARTYPANTS_LATEX_DASHES |
+		blackfriday.HTML_NOFOLLOW_LINKS
+
+	commonExtensions = 0 |
+		blackfriday.EXTENSION_NO_INTRA_EMPHASIS |
+		blackfriday.EXTENSION_TABLES |
+		blackfriday.EXTENSION_FENCED_CODE |
+		blackfriday.EXTENSION_AUTOLINK |
+		blackfriday.EXTENSION_STRIKETHROUGH |
+		blackfriday.EXTENSION_SPACE_HEADERS |
+		blackfriday.EXTENSION_HEADER_IDS |
+		blackfriday.EXTENSION_BACKSLASH_LINE_BREAK |
+		blackfriday.EXTENSION_DEFINITION_LISTS
+)
+
+var (
+	// 渲染markdown操作和截取摘要操作
+	regIdentifier = regexp.MustCompile(config.Conf.BlogApp.General.Identifier)
+	// header
+	regHeader = regexp.MustCompile("</nav></div>")
+)
+
+// IgnoreHtmlTag 去掉 html tag
+func IgnoreHtmlTag(src string) string {
+	// 去除所有尖括号内的HTML代码
+	re, _ := regexp.Compile(`<[\S\s]+?>`)
+	src = re.ReplaceAllString(src, "")
+
+	// 去除换行符
+	re, _ = regexp.Compile(`\s+`)
+	return re.ReplaceAllString(src, "")
+}
+
+// RenderPage 渲染markdown
+func RenderPage(md []byte) []byte {
+	renderer := blackfriday.HtmlRenderer(commonHtmlFlags, "", "")
+	return blackfriday.Markdown(md, renderer, commonExtensions)
+}
+
+// GenerateExcerptMarkdown 生成预览和描述
+func GenerateExcerptMarkdown(article *model.Article) {
+	blogapp := config.Conf.BlogApp
+
+	if strings.HasPrefix(article.Content, blogapp.General.DescPrefix) {
+		index := strings.Index(article.Content, "\r\n")
+		prefix := article.Content[len(blogapp.General.DescPrefix):index]
+
+		article.Desc = IgnoreHtmlTag(prefix)
+		article.Content = article.Content[index:]
+	}
+
+	// 查找目录
+	content := RenderPage([]byte(article.Content))
+	index := regHeader.FindIndex(content)
+	if index != nil {
+		article.Header = string(content[0:index[1]])
+		article.Content = string(content[index[1]:])
+	} else {
+		article.Content = string(content)
+	}
+
+	// excerpt
+	index = regIdentifier.FindStringIndex(article.Content)
+	if index != nil {
+		article.Excerpt = IgnoreHtmlTag(article.Content[:index[0]])
+	}
+	uc := []rune(article.Content)
+	length := blogapp.General.Length
+	if len(uc) < length {
+		length = len(uc)
+	}
+	article.Excerpt = IgnoreHtmlTag(string(uc[0:length]))
+}