test image & math

tools/index.js

@@ -0,0 +1,61 @@
+'use strict';
+var cheerio = require('cheerio');
+
+// http://stackoverflow.com/questions/14480345/how-to-get-the-nth-occurrence-in-a-string
+function getPosition(str, m, i) {
+  return str.split(m, i).join(m).length;
+}
+
+var version = String(hexo.version).split('.');
+hexo.extend.filter.register('after_post_render', function(data){
+  var config = hexo.config;
+  if(config.post_asset_folder){
+    	var link = data.permalink;
+	if(version.length > 0 && Number(version[0]) == 3)
+	   var beginPos = getPosition(link, '/', 1) + 1;
+	else
+	   var beginPos = getPosition(link, '/', 4) + 1;     //markdown的本地路径是xxx/x.jpg    hexo g编译后加上这句就是public/2020/05/26/xxx/xx.jpg 前4个文件+后一个图片~
+	// In hexo 3.1.1, the permalink of "about" page is like ".../about/index.html".
+	var endPos = link.lastIndexOf('/') + 1;
+    link = link.substring(beginPos, endPos);
+
+    var toprocess = ['excerpt', 'more', 'content'];
+    for(var i = 0; i < toprocess.length; i++){
+      var key = toprocess[i];
+
+      var $ = cheerio.load(data[key], {
+        ignoreWhitespace: false,
+        xmlMode: false,
+        lowerCaseTags: false,
+        decodeEntities: false
+      });
+
+      $('img').each(function(){
+		if ($(this).attr('src')){
+			// For windows style path, we replace '\' to '/'.
+			var src = $(this).attr('src').replace('\\', '/');
+			if(!/http[s]*.*|\/\/.*/.test(src) &&
+			   !/^\s*\//.test(src)) {
+			  // For "about" page, the first part of "src" can't be removed.
+			  // In addition, to support multi-level local directory.
+			  var linkArray = link.split('/').filter(function(elem){
+				return elem != '';
+			  });
+			  var srcArray = src.split('/').filter(function(elem){
+				return elem != '' && elem != '.';
+			  });
+			  if(srcArray.length > 1)
+				srcArray.shift();
+			  src = srcArray.join('/');
+			  $(this).attr('src', config.root + link + src);
+			  console.info&&console.info("update link as:-->"+config.root + link + src);
+			}
+		}else{
+			console.info&&console.info("no src attr, skipped...");
+			console.info&&console.info($(this));
+		}
+      });
+      data[key] = $.html();
+    }
+  }
+});