Fix compressor calls

pipeline/compressors/__init__.py

@@ -243,7 +243,7 @@ class SubProcessCompressor(CompressorBase):
             else:
                 argument_list.extend(flattening_arg)
 
-        pipe = subprocess.Popen(argument_list, shell=True, stdout=subprocess.PIPE,
+        pipe = subprocess.Popen(argument_list, stdout=subprocess.PIPE,
                                 stdin=subprocess.PIPE, stderr=subprocess.PIPE)
         if content:
             content = smart_bytes(content)

pipeline/compressors/closure.py

@@ -6,5 +6,5 @@ from pipeline.compressors import SubProcessCompressor
 
 class ClosureCompressor(SubProcessCompressor):
     def compress_js(self, js):
-        command = '%s %s' % (settings.CLOSURE_BINARY, settings.CLOSURE_ARGUMENTS)
+        command = (settings.CLOSURE_BINARY, settings.CLOSURE_ARGUMENTS)
         return self.execute_command(command, js)

pipeline/compressors/cssmin.py

@@ -6,5 +6,5 @@ from pipeline.compressors import SubProcessCompressor
 
 class CSSMinCompressor(SubProcessCompressor):
     def compress_css(self, css):
-        command = "%s %s" % (settings.CSSMIN_BINARY, settings.CSSMIN_ARGUMENTS)
+        command = (settings.CSSMIN_BINARY, settings.CSSMIN_ARGUMENTS)
         return self.execute_command(command, css)

pipeline/compressors/csstidy.py

@@ -10,8 +10,9 @@ class CSSTidyCompressor(SubProcessCompressor):
     def compress_css(self, css):
         output_file = tempfile.NamedTemporaryFile(suffix='.pipeline')
 
-        command = '%s - %s %s' % (
+        command = (
             settings.CSSTIDY_BINARY,
+            "-",
             settings.CSSTIDY_ARGUMENTS,
             output_file.name
         )

pipeline/compressors/uglifyjs.py

@@ -6,7 +6,7 @@ from pipeline.compressors import SubProcessCompressor
 
 class UglifyJSCompressor(SubProcessCompressor):
     def compress_js(self, js):
-        command = '%s %s' % (settings.UGLIFYJS_BINARY, settings.UGLIFYJS_ARGUMENTS)
+        command = (settings.UGLIFYJS_BINARY, settings.UGLIFYJS_ARGUMENTS)
         if self.verbose:
             command += ' --verbose'
         return self.execute_command(command, js)

pipeline/compressors/yuglify.py

@@ -6,7 +6,11 @@ from pipeline.compressors import SubProcessCompressor
 
 class YuglifyCompressor(SubProcessCompressor):
     def compress_common(self, content, compress_type, arguments):
-        command = '%s --type=%s %s' % (settings.YUGLIFY_BINARY, compress_type, arguments)
+        command = (
+            settings.YUGLIFY_BINARY,
+            "--type={}".format(compress_type),
+            arguments
+        )
         return self.execute_command(command, content)
 
     def compress_js(self, js):

pipeline/compressors/yui.py

@@ -6,7 +6,11 @@ from pipeline.compressors import SubProcessCompressor
 
 class YUICompressor(SubProcessCompressor):
     def compress_common(self, content, compress_type, arguments):
-        command = '%s --type=%s %s' % (settings.YUI_BINARY, compress_type, arguments)
+        command = (
+            settings.YUI_BINARY,
+            "--type={}".format(compress_type),
+            arguments
+        )
         return self.execute_command(command, content)
 
     def compress_js(self, js):