%F token in Nemo actions does not expand to file path (expands to empty string)

[iampossiblyatwork]

Distribution

Linux Mint version: 22.3 "Zena"

Package version

Nemo version: 6.6.3

Frequency

Always

Bug description

The %F token is documented in /usr/share/nemo/actions/sample.nemo_action as:

# %F - insert path list of selection

However, when used in a custom action's Exec line, %F expands to an empty string. Only %f
produces a value, but it gives just the display name (filename without path), which matches
its own documentation (# %f or %N (deprecated) - insert display name of first selected file).

All other path/URI tokens (%U, %D, %d, %p, %P) also expand to empty strings.

Steps to reproduce

1. Create ~/.local/share/nemo/actions/test-tokens.nemo_action:

   [Nemo Action]
   Active=true
   Name=Test Tokens
   Exec=bash -c 'echo "f=[%f] F=[%F] U=[%U] d=[%d] D=[%D]" >> /tmp/nemo-token-test.log'
   Selection=S
   Extensions=Any;

2. Right-click any file -> Test Tokens

3. Read /tmp/nemo-token-test.log

Actual result:
f=[filename.ext] F=[] U=[] d=[] D=[]

Expected behavior

Expected result:
f=[filename.ext] F=[/full/path/to/filename.ext] U=[file:///full/path/to/filename.ext] ...

Additional information

The NEMO_SCRIPT_SELECTED_FILE_PATHS environment variable is set correctly and can be read
from the script:

path=$(printf '%s' "$NEMO_SCRIPT_SELECTED_FILE_PATHS" | head -1)

[ranolfi]

Confirmed, affected by exactly the same problem. Very good description.

[mtwebster]

Use:

NEMO_DEBUG=Actions nemo --debug

You can get some useful info about actions live (such as observing the values it replaces the tokens with)

 Extensions=Any;

Predefined Extensions values are lower-case - your example wouldn't show at all. This needs to be 'any'.

I can't reproduce this:

(nemo:67730): Nemo-DEBUG: 14:22:26.461: nemo_action_update_display_state: ../libnemo-private/nemo-action.c:2115: Action 'pr3779-token-test' determined VISIBLE
(nemo:67730): Nemo-DEBUG: 14:22:26.461: get_final_label: ../libnemo-private/nemo-action.c:1637: Action Label: Test F token
(nemo:67730): Nemo-DEBUG: 14:22:26.461: nemo_action_manager_update_action_states: ../libnemo-private/nemo-action-manager.c:1000: Skipping submenu 'Utilities' (visibility managed by GtkUIManager)

(nemo:67730): Nemo-CRITICAL **: 14:22:28.668: get_device_path: assertion 'mount != NULL' failed
(nemo:67730): Nemo-DEBUG: 14:22:28.668: nemo_action_activate: ../libnemo-private/nemo-action.c:1542: Action Spawning: bash -c 'echo "f=[etc] F=[/etc] U=[file:///etc] d=[%d] D=[]"'
f=[etc] F=[/etc] U=[file:///etc] d=[%d] D=[]

%d is not a valid token so it's passed thru literally.
%D mount only returns something useful when a mount point is selected (like Devices in the sidebar or the 'Computer' location).

NEMO_SCRIPT_SELECTED_FILE_PATHS is never populated for actions - scripting is completely separate (and mostly unsupported in favor of actions).

The path token will end up empty if you run this on a remote filesystem that lacks a local mount-point - these files can have no path, only a uri.

[Jeremy7701]

[...] scripting is completely separate (and mostly unsupported in favor of actions).

Hope not!
For fairly simple procedures, a script is much simpler than setting up an action.