Don't run gzip when public folder has/does not exist

Continuation of 71c5878400
This is necessary especially to prevent gzip from running when hexo clean

index.js

@@ -1,7 +1,6 @@
 /* global hexo */
 var assign = require('object-assign');
 
-//module.exports = function (hexo) {
 if (true === hexo.config.neat_enable) {
     // HTML minifier
     hexo.config.neat_html = assign({
@@ -36,15 +35,14 @@ var assign = require('object-assign');
     }, hexo.config.neat_js);
 
     // html, css, js compression
-        hexo.config.gzip = assign({
+    hexo.config.neat_gzip = assign({
         enable: true,
         logger: true,
-        }, hexo.config.gzip);
+    }, hexo.config.neat_gzip);
 
     var filter = require('./lib/filter');
     hexo.extend.filter.register('after_render:html', filter.logic_html);
     hexo.extend.filter.register('after_render:css', filter.logic_css);
     hexo.extend.filter.register('after_render:js', filter.logic_js);
-        hexo.extend.filter.register('after_generate', filter.logic_gzip);
+    hexo.extend.filter.register('before_exit', filter.logic_gzip);
 }
-//}

lib/filter.js

@@ -7,7 +7,7 @@ var CleanCSS = require('clean-css'),
 var Promise = require('bluebird');
 var minimatch = require('minimatch');
 var zlib = require('zlib');
-var fs = require('fs');
+var fs = require('hexo-fs');
 
 function logic_html(str, data) {
     var hexo = this,
@@ -32,7 +32,7 @@ function logic_html(str, data) {
         log.log('Minify the html: %s [%s saved]', path, saved + '%');
     }
     return result;
-};
+}
 
 function logic_css(str, data) {
     var hexo = this,
@@ -79,7 +79,7 @@ function logic_js(str, data) {
         }
     }
 
-    //uglifyjs doesn't like irrelevant options
+    //uglifyjs doesn't like unsupported options
     delete options.enable;
     delete options.exclude;
     var js_logger = options.logger;
@@ -96,16 +96,18 @@ function logic_js(str, data) {
 
 function logic_gzip() {
     var hexo = this,
-        options = hexo.config.gzip;
+        options = hexo.config.neat_gzip;
     // Return if disabled.
     if (false === options.enable) return;
 
     var publicFolder = hexo.public_dir;
 
     var compressFile = function (currentPath) {
-      var files = fs.readdirSync(currentPath);
+      var fileExist = fs.existsSync(currentPath);
+      if (fileExist) {
+        var files = fs.listDirSync(currentPath);
         for (var i in files) {
-        var currentFile = currentPath + '/' + files[i];
+          var currentFile = currentPath + files[i];
           var stats = fs.statSync(currentFile);
           if (stats.isFile()) {
             if(currentFile.endsWith(".htm") ||
@@ -117,18 +119,17 @@ function logic_gzip() {
               var inp = fs.createReadStream(currentFile);
               var out = fs.createWriteStream(currentFile+'.gz');
               inp.pipe(gzip).pipe(out);
-
               if (options.logger) {
                 var log = hexo.log || console.log;
                 log.log('Compress the file: %s', currentFile);
               }
             }
-        }
+          } else if (stats.isDirectory()) {
-        else if (stats.isDirectory()) {
             compressFile(currentFile);
           }
         }
-    };
+      }
+    }
     compressFile(publicFolder);
 }
 
@@ -136,5 +137,5 @@ module.exports = {
     logic_html: logic_html,
     logic_css: logic_css,
     logic_js: logic_js,
-    logic_gzip: logic_gzip,
+    logic_gzip: logic_gzip
 };

package.json

@@ -1,7 +1,7 @@
 {
   "name": "hexo-yam",
   "description": "Yet Another Minifier. Minify and compress html, js and css",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "readme": "README.md",
   "main": "index.js",
   "directories": {
@@ -24,7 +24,8 @@
     "minimatch": "^3.0.4",
     "object-assign": "^4.1.1",
     "stream-to-array": "^2.3.0",
-    "uglify-js": "^3.4.9"
+    "uglify-js": "^3.4.9",
+    "hexo-fs": "^0.2.3"
   },
   "keywords": [
     "html",