[ocrfeeder] Replace the -i CLI option by a positional argument

[Joaquim Manuel Pereira Rocha <jrocha src gnome org>]

commit f5f1b076993ec0ba94250f21051e049072c7e230
Author: Joaquim Rocha <me joaquimrocha com>
Date:   Sun Mar 18 15:04:06 2018 +0100

    Replace the -i CLI option by a positional argument
    
    This will avoid the current errors when OCRFeeder is called without an
    argument for the --image option.
    With a positional argument, the same functionality is possible but made
    simpler (thanks to Alberto Garcia for the suggestion).
    
    gb#767732

 resources/ocrfeeder.desktop.in        |    2 +-
 src/ocrfeeder/studio/studioBuilder.py |    7 +++----
 2 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/resources/ocrfeeder.desktop.in b/resources/ocrfeeder.desktop.in
index 47fb238..ede5108 100644
--- a/resources/ocrfeeder.desktop.in
+++ b/resources/ocrfeeder.desktop.in
@@ -4,7 +4,7 @@ Type=Application
 _Name=OCRFeeder
 _Comment=The complete OCR suite.
 TryExec=ocrfeeder
-Exec=ocrfeeder -i %f
+Exec=ocrfeeder %F
 Icon=ocrfeeder
 MimeType=image/bmp;image/gif;image/jpeg;image/jpg;image/pjpeg;image/png;image/tiff;
 Categories=Application;Office;
diff --git a/src/ocrfeeder/studio/studioBuilder.py b/src/ocrfeeder/studio/studioBuilder.py
index 062ab01..43cb432 100644
--- a/src/ocrfeeder/studio/studioBuilder.py
+++ b/src/ocrfeeder/studio/studioBuilder.py
@@ -123,10 +123,9 @@ class Studio:
         self.main_window.setDestroyEvent(self.quit)
 
         parser = ArgumentParser(description=OCRFEEDER_STUDIO_COMMENTS)
-        parser.add_argument('-i', '--images', metavar='IMAGE1 [IMAGE2, ...]',
-                            nargs='+', help='images to be automatically added '
-                            'on start-up. Use the option before every image '
-                            'path.')
+        parser.add_argument('images', metavar='IMAGE',
+                            nargs='*', help='images to be automatically added '
+                            'on start-up')
         parser.add_argument('-d', '--dir', help='directory with images to be '
                             'added automatically on start-up')
         parser.add_argument('-v', '--version', action='version',