"handlr list" doesn't fully describe decision making process. make it clearer what assumed prior knowledge is? about handlr HOT 5 OPEN

@Dieterbe I've added --all to handlr list which will show all the associations, user and system :)

about something like handlr explain that says, for a given file, how it arrives at a decision?

Yeah I might add a verbose option to handlr get at some point. What do you think ?

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handlr list --all is helpful, and the verbose flag sounds good. thank you!

FWIW, as a user it's not necessarily clear why certain associations exist (for example when i run the new handlr list --all i have "added associations" which seem to come from desktop files in /home/dieter/.local/share/applications/, but also from /usr/share/applications/, but confusingly other files from /usr/share/applications seem to go under "System Apps", not "added associations") a quick note about where the associations come from, maybe with a link to the relevant spec, would be really useful I think.

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@Dieterbe this feature is now released in v0.5 :)

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So, which specs should one read to understand how this tool works?
I was reading the source and through https://crates.io/crates/freedesktop-desktop-entry I found out it uses the spec https://specifications.freedesktop.org/desktop-entry-spec/latest/index.html

which other ones ? https://www.freedesktop.org/wiki/Specifications/file-uri-spec/ ? https://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec/ ?
https://specifications.freedesktop.org/mime-apps-spec/mime-apps-spec-1.0.1.html ?

so far, seems mime-apps-spec is the most relevant one. Again, some guidance to users of this tool about what they should know, would be very helpful.

edit: after some reverse engineering, it seems handlr follows what mime-apps-spec says, and uses the files mentioned there. associations are maintained in $XDG_CONFIG_HOME/mimeapps.list (even when set through handlr), and not in the handlr config file. sort of stuff would be very useful to document . some more things i found out, the "selector" to choose how to open is only in case you have multiple entries on the priority mimeapps config. it doesn't let you choose if you have different choices at different priority levels.

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@Dieterbe good points. If you wanna write up a quick paragraph to add it to the README I would really appreciate it

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