[ocrfeeder] Refactor runGhostscript()

[Joaquim Rocha <jrocha src gnome org>]

commit 20d9b58ea139834857a24dedf1b5497e3e8c54a0
Author: scx <scx mail gmail com>
Date:   Sun Mar 8 23:26:34 2020 +0100

    Refactor runGhostscript()
    
    Move ghostscript's options into function parameters

 src/ocrfeeder/util/lib.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/src/ocrfeeder/util/lib.py b/src/ocrfeeder/util/lib.py
index 7b4f096..bee5ac7 100644
--- a/src/ocrfeeder/util/lib.py
+++ b/src/ocrfeeder/util/lib.py
@@ -92,10 +92,7 @@ def convertPdfToImages(pdf_file, temp_dir = '/tmp'):
 
     return dir_name
 
-def runGhostscript(dir_name, base_name, pdf_path):
-    format='jpeg'
-    resolution = 300
-    size = 'letter'
+def runGhostscript(dir_name, base_name, pdf_path, format = 'jpeg', resolution = 300, size = 'letter'):
     command = 'gs -SDEVICE=%(format)s -r%(resolution)sx%(resolution)s -sPAPERSIZE=%(size)s ' \
               '-sOutputFile=\'%(temp_name)s/%(file_name)s_%%04d.jpg\' ' \
               '-dNOPAUSE -dBATCH -- \'%(pdf_file)s\'' % \