ranger: Add 'source ranger' support

[SEbbaDK]

Motivation for this change

The current ranger derivation does not support the source ranger trick to easily use ranger as a cd replacement for the bash shell.
It might be confusing for people using nix that this behaviour is not supported when it is mentioned in the ranger manual, so this commit adds support for it.

Things done

Changed the wrapper to check if the script is being sourced from bash, and automatically uses the --choosedir flag to write the path to a temporary file (much as the original ranger file does).
I would have preferred to actually use the code from the .ranger-wrapped file that ranger ships with, but it seems rather involved because of the shebangs and mixed python code.

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[toonn]

Maybe you can reuse the example we already include? https://github.com/ranger/ranger/blob/master/examples/shell_automatic_cd.sh

I.e., source it to define the function then just run that function? Might have to patch it to get .ranger-wrapped in there, of course.

[stale]

I marked this as stale due to inactivity. → More info