Allow nested search with option

README.md

@@ -35,10 +35,13 @@ webp:
   # The quality of the webp conversion 0 to 100 (where 100 is least lossy)
   quality: 75
 
-  # List of directories containing images to optimize, nested directories will not be checked
+  # List of directories containing images to optimize, nested directories will only be checked if `nested` is true
   # By default the generator will search for a folder called `/img` under the site root and process all jpg, png and tiff image files found there.
   img_dir: ["/img"]
 
+  # Whether to search in nested directories or not
+  nested: false
+
   # add ".gif" to the format list to generate webp for animated gifs as well
   formats: [".jpeg", ".jpg", ".png", ".tiff"]
 

lib/jekyll-webp/defaults.rb

@@ -13,9 +13,12 @@ module Webp
       # https://developers.google.com/speed/webp/docs/cwebp#options
       'flags'     => "-m 4 -pass 4 -af",
 
-      # List of directories containing images to optimize, Nested directories will not be checked
+      # List of directories containing images to optimize, Nested directories only be checked if `nested` is true
       'img_dir'   => ["/img"],
 
+      # Whether to search in nested directories or not
+      'nested'   => false,
+
       # add ".gif" to the format list to generate webp for animated gifs as well
       'formats'   => [".jpeg", ".jpg", ".png", ".tiff"],
 

lib/jekyll-webp/webpGenerator.rb

@@ -40,6 +40,16 @@ def generate(site)
         # If the site destination directory has not yet been created then create it now. Otherwise, we cannot write our file there.
         Dir::mkdir(site.dest) if !File.directory? site.dest
 
+        # If nesting is enabled, get all the nested directories too
+        if @config['nested']
+          newdir = []
+          for imgdir in @config['img_dir']
+            # Get every directory below (and including) imgdir, recursively
+            newdir.concat(Dir.glob(imgdir + "/**/"))
+          end
+          @config['img_dir'] = newdir
+        end
+
         # Counting the number of files generated
         file_count = 0