(https://github.com/ruby/irb/pull/686)
* Support `VISUAL` env var, and prefer it over `EDITOR`
* Update test/irb/test_cmd.rb
---------
399b872c31
Co-authored-by: Stan Lo <stan001212@gmail.com>
(https://github.com/ruby/irb/pull/658)
* Decouple `edit` command from `show_source`
2 commands should not depend on each other. If `edit` command also needs
to find a source, the source finding logic should be extracted into a
separate class.
* Return nil if is not an actual file path
* Refactor SourceFinder
9790517a0c
(https://github.com/ruby/irb/pull/478)
Given that `show_doc` already supports syntax like `String#gsub`, it
should be able to take it in non-string form too, like `edit` and
`show_source` do. This ensures users can have a consistent syntax on
argument between different commands.
