Selection of external viewer

[abde]

When trying to set the external viewer for opening PDF files:

calibre 2.48 isfrozen: False is64bit: False
Linux-4.3.0-1-686-pae-i686-with-debian-stretch-sid Linux ('32bit', 'ELF')
('Linux', '4.3.0-1-686-pae', '#1 SMP Debian 4.3.3-2 (2015-12-17)')
Python 2.7.11
Linux: ('debian', 'stretch/sid', '')
Successfully initialized third party plugins: Count Pages
Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/gui2/open_with.py", line 282, in programs_found
    entry_to_item(entry, self.plist)
  File "/usr/lib/calibre/calibre/gui2/open_with.py", line 187, in entry_to_item
    ans = QListWidgetItem(QIcon(icon_path), entry.get('Name') or _('Unknown'), parent)
TypeError: QIcon(): argument 1 has unexpected type 'dict'

MEGA UGGLY FIX:
in File "/usr/lib/calibre/calibre/gui2/open_with.py", line 187
        replaced line ans = QListWidgetItem(QIcon(icon_path), entry.get('Name') or _('Unknown'), parent)
        by ans = QListWidgetItem(QIcon('/somewhere/somefile.png'), entry.get('Name') or _('Unknown'), parent)

Hope this help to find a solution

[Kovid Goyal (kovid)]

That indicates you have some broken icon theme on your system, stick
some print statements into read_icon_theme_dir() function in
open_with/linux.py to see why it is returning an icon as a dictionary
instead of a path. Also change the if on line 132 to be always true and
then run:

calibre-debug -c "from calibre.utils.open_with.linux import *; find_icons()"

the print statements should tell us what the problematic icon theme
dorectory is, then you can attach it to this ticket and I will take a
look.

 status incomplete

[Kovid Goyal (kovid)]

It could also be a malformed desktop file, which you can check by
sticking some print statements after line 187

[Kovid Goyal (kovid)]

no followup