Add Support for custom CWEBP bin path

Author: scl

README.md

@@ -53,6 +53,7 @@ webp:
 
   # Local path to the WebP utilities to use (relative or absolute)
   # Omit or leave as nil to use the utilities shipped with the gem, override only to use your local install
+  # Eg : "/usr/local/bin/cwebp"
   webp_path: nil
 
   # List of files or directories to exclude

lib/jekyll-webp/webpExec.rb

@@ -9,22 +9,26 @@ class WebpExec
       # Runs the WebP executable for the given input parameters
       # the function detects the OS platform and architecture automatically
       #
-      def self.run(quality, flags, input_file, output_file)
+      def self.run(quality, flags, input_file, output_file, webp_bin_fullpath)
 
-        # What is the path to the execs inside the gem? perhaps just bin/?
-        bin_path = "bin/"
+        if webp_bin_fullpath
+          full_path = webp_bin_fullpath
+        else
+          # What is the path to the execs inside the gem? perhaps just bin/?
+          bin_path = "bin/"
 
-        # What is the OS and architecture specific executable name?
-        exe_name = WebpExec.exe_name
+          # What is the OS and architecture specific executable name?
+          exe_name = WebpExec.exe_name
 
-        # We need to locate the Gems bin path as we're currently running inside the 
-        # jekyll site working directory
-        # http://stackoverflow.com/a/10083594/779521
-        gem_spec = Gem::Specification.find_by_name("jekyll-webp")
-        gem_root = gem_spec.gem_dir
+          # We need to locate the Gems bin path as we're currently running inside the
+          # jekyll site working directory
+          # http://stackoverflow.com/a/10083594/779521
+          gem_spec = Gem::Specification.find_by_name("jekyll-webp")
+          gem_root = gem_spec.gem_dir
 
-        # Construct the full path to the executable
-        full_path = File.join(gem_root, bin_path, exe_name)
+          # Construct the full path to the executable
+          full_path = File.join(gem_root, bin_path, exe_name)
+        end
 
         # Construct the full program call
         cmd = "\"#{full_path}\" -quiet -mt -q #{quality.to_s} #{flags} \"#{input_file}\" -o \"#{output_file}\""

lib/jekyll-webp/webpGenerator.rb

@@ -92,7 +92,7 @@ def generate(site)
                 Jekyll.logger.info "WebP:", "Change to source image file #{imgfile} detected, regenerating WebP"
 
                 # Generate the file
-                WebpExec.run(@config['quality'], @config['flags'], imgfile, outfile_fullpath_webp)
+                WebpExec.run(@config['quality'], @config['flags'], imgfile, outfile_fullpath_webp, @config['webp_path'])
                 file_count += 1
               end
               if File.file?(outfile_fullpath_webp)