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I'm playing around with .desktop files and ended up with this one:

[Desktop Entry] Version=1.0 Name=Music Player (cmus) Comment=Command Line Music Player GenericName=Music Player Exec=cmus Terminal=true X-MultipleArgs=false Type=Application StartupNotify=false

Everything is working so far.

Now I'm also using i3wm and wanna assign the application to a specific workspace. That's my current configuration:

assign [class="^cmus.*$"] 5:🎡

Unfortunately the class is not set, as it is not defined yet.

It is working pretty well for other applications which accept an argument, e.g. Firefox:

[Desktop Entry] Version=1.0 Name=Twitter Profile - Firefox Comment=Browse the World Wide Web GenericName=Web Browser Keywords=Internet;WWW;Browser;Web;Explorer Exec=firefox --class="Firefox Social Media" -P "Social Media" %u Terminal=false X-MultipleArgs=false Type=Application Icon=firefox

With i3wm config:

assign [class="^Firefox Social Media$"] 10:🌐

Can someone tell me how to define the wm class for .desktop entries starting in a terminal? I couldn't find anything.

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2 Answers 2

Reset to default
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You can't setup WM_CLASS via .desktop file because it is up to application to set up its own WM_CLASS.

But many applications still allow to change their class using standard methods of their toolkit (GTK/Qt) so most of them will respect --class command line option.

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I'm now using the following workaround which I don't consider an real solution.

As I'm using gnome-terminal, the following is possible to set the wm_class:

[Desktop Entry] Exec=gnome-terminal --class=cmus -e cmus Terminal=false

Didn't work using the wrapper x-terminal-emulator as it is linked to an wrapper which doesn't support the class.

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    This doesn't seem to actually change the class, at least on Ubuntu 22 with default setup (Wayland). gnome-terminal seems to ignore the parameter entirely and sets WM_CLASS to gnome-terminal-server. Commented Jan 8, 2023 at 20:18

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