[Feature Request] Remove the extra separator at the end of each line

[cfgnunes]

@v1cont, first of all, thank you very much for your ongoing work on YAD. It’s an excellent and powerful tool that greatly enhances shell scripting productivity.

Description

I’ve noticed that YAD adds an extra field separator (|) at the end of each line in the output of list or checklist dialogs.
While this is not exactly a bug, it can make output parsing more cumbersome, as it requires trimming the last separator from each line.

For example:

$ yad --list --checklist --column="Select" --column="Option" -- TRUE "Opt1" TRUE "Opt2"

Current output:

TRUE|Opt1|
TRUE|Opt2|

Expected (or ideal) output:

TRUE|Opt1
TRUE|Opt2

Rationale

It would be preferable if YAD did not insert the trailing separator after the last column.
This would make parsing easier in shell scripts and align the behavior with Zenity, allowing YAD and Zenity to be used interchangeably in the same scripts.

For reference, you can see how I use YAD and Zenity interchangeably in my scripts here:
https://github.com/cfgnunes/fm-scripts

Suggestion

If possible, it might be good to adjust the list output logic so that the trailing separator is omitted, or optionally controlled by a parameter (e.g., --no-trailing-separator).

---

Thank you again for your time, dedication, and all your great work on YAD!
Best regards,

[step-]

@gfgnunes, it's been like that since at least 0.40.0. So I suspect that changing the default behavior could break many existing yad scripts. I'm not the author; I think that, as long as yad handles the separator consistently with itself, having or not having a trailing separator doesn't matter. I do see a slight advantage to the trailing separator when the --separator=$'\n' option is used.

# yad --separator=$'\n' --list --checklist --column="Select" --column="Option" -- TRUE "Opt1" TRUE "Opt2"
WARNING: You are use --checklist or --radiolist option. Those options obsoleted and will be removed in the future
TRUE
Opt1
               <<< empty line
TRUE
Opt2
               <<< empty line

With --separator=$'\n' we get an empty line separating output records for free. That enables awk's RS="" feature, if one cares.

Note yad outputs a warning because I have enabled the yad debugging feature using gsettings:

# Ignore unknown command-line options (false if debug)
#ignore_unknown_options=true
ignore_unknown_options=false
# Enable debug mode and warn about deprecated features
#debug=false
debug=true