[ruby-core:84003] [Ruby trunk Feature#14141][Assigned] Add a method to Exception for retrieving formatted exception for logging purpose (Exception#{formatted, display})

Issue #14141 has been updated by sorah (Sorah Fukumori).

Status changed from Open to Assigned
Assignee set to matz (Yukihiro Matsumoto)

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Feature #14141: Add a method to Exception for retrieving formatted exception for logging purpose (Exception#{formatted,display})
https://bugs.ruby-lang.org/issues/14141#change-68084

* Author: sorah (Sorah Fukumori)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
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Most people want to log caught exceptions to stderr (or somewhere else) then continues their program as usual.

```
def the_program
  # ...
  raise "failure!"
  # ...
rescue RuntimeError => e
  $stderr.puts "#{e.message} (#{e.class})\n\t#{e.backtrace.join("\n\t")}"
  retry
end
```

I'm very bored to write error logging many time...
I want to log errors in the default format of Ruby, just like the following:

```
rescue RuntimeError => e
  e.display
  # ...
```

From Ruby 2.5, we've started branching error formatting on TTY-ness of `$stderr`. It'd be bit more useful if we can log using the same format with the format which Ruby determines.

Ruby already has `Object#display`. 
One consideration is to retrieve formatted String from Exception object, but the current error logging code (eval_error.c) depends on IO,
so I want to start from just having `Exception#display`.  I think most use case is just to log errors into IO.


---Files--------------------------------
2.patch (8.74 KB)
0001-Add-Exception-formatted-to-get-a-formatted-string.patch (8.36 KB)
0002-Add-Exception-display-to-log-exception.patch (1.99 KB)


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