Add a `--edit` option

[BuonOmo]

This option will help contributing, as the edit this page on github button does on https://tldr.ostera.io/man.

This is a minimum viable product. If you feel this is interesting, I could go further and open an editor if the page is a local page or if it contains a patch. To do so, I was thinking of refactoring a tiny bit PageLookupResult to contain those information.

[BuonOmo]

@niklasmohrin definitely agree with all of your points. I don't think I'll have the time to dive into specification discussion. I'll just ping them there about this idea to give them more insights on how it could be done.

I could also, as an alternative proposition, just add the link in the presentation of the command directly:

$ tldr command
  Command forces the shell to execute the program and ignore any functions, builtins and aliases with the same name.
  More information: <https://manned.org/command>.

  Execute the `ls` program literally, even if an `ls` alias exists:

      command ls

  Display the path to the executable or the alias definition of a specific command:

      command -v command_name

Edit this page on GitHub: https://github.com/tldr-pages/tldr/edit/main/pages/common/command.md

[niklasmohrin]

That's okay :) About appending it to the output: My first impression is that the tldr pages are explicitly designed to be compact and I would hate it if users would have to scroll up one line just because we have this "contribution advertisement". As a user, this could possibly annoy me into switching to another client. I am against changing the default behavior in this way.

Another thought for the spec discussion: This output could be an idea for --edit. We could make it mean that the flag doesn't work like a subcommand, but rather an additional option to the default behavior (i.e. tldr command is unchanged and tldr --edit command outputs what you wrote above). This would also allow for having this flag permanently enabled by config or so.

However, I think I like the initial proposal better, because we can then put more information about editing, not just one line. :D

[BuonOmo]

Closing for now, we'll see how specs evolve. In the mean time I'll be using my branch, and anyone in favor of that could. I'll update it if requested