Report log level to stderr

[rpdelaney]

For example:

$ wl-paste > ~/carlsen-kaidanov-2023.pgn
Clipboard content is not available as inferred output type "application/vnd.chess-pgn"
Use "wl-paste --list-types" to view available types. Use "--type" to explicitly specify a type.
$

With this output it's not clear if the file has been created (it has) or if this error is fatal (it's not). Something like this might be better:

$ wl-paste > ~/carlsen-kaidanov-2023.pgn
Warning: 
Clipboard content is not available as inferred output type "application/vnd.chess-pgn"
Use "wl-paste --list-types" to view available types. Use "--type" to explicitly specify a type.
$

[bugaevc]

Hi,

thanks for the suggestion, but I don't think I'm following why you'd want that:

it's not clear if the file has been created (it has)

Well, the (empty) file is created by your shell, not by wl-clipboard, before wl-paste even starts running. So the file will be created whether or not wl-clipboard does anything or runs into any errors.

if this error is fatal (it's not)

Depending on what you call fatal, I guess? It certainly means we could not paste; wl-paste exits with code 1 right after printing this error. But it's not fatal, as in nothing's crashed, your computer is not on fire, you should probably just re-run wl-paste with an explicit --type option.

In your specific case, you're trying to paste to a PGN file, so wl-clipboard looks for application/vnd.chess-pgn in the clipboard, but apparently it doesn't contain that. Since PGN is (apparently) a textual format, perhaps the source app thought it was copying plain text? Try wl-paste --type text > ~/carlsen-kaidanov-2023.pgn then.

[rpdelaney]

I see. If I'm wrong in thinking this is a warning and not fatal, then can illustrate the point: users are prone to confusion about which messages are for fatal errors without being hit over the head with it. :)