`IRB::Inspector#inspect_value` errors
(https://github.com/ruby/irb/pull/511)
**Before**
```
irb(main):001:0> c = Cat.new "foo"
(Object doesn't support #inspect)
=>
```
**After**
```
irb(main):001:0> c = Cat.new "foo"
An error occurred when inspecting the object: #<NoMethodError: undefined method `is_a?' for foo:Cat
if obj.is_a?(String)
^^^^^^>
Result of Kernel#inspect: #<Cat:0x0000000109090d80 @name="foo">
=>
```
* Use colorable: argument as the only coloring control
* Centalize color controling logic at Color.colorable?
There are 2 requirements for coloring output:
1. It's supported on the platform
2. The user wants it: `IRB.conf[:USE_COLORIZE] == true`
Right now we check 1 and 2 separately whenever we colorize things.
But it's error-prone because while 1 is the default of `colorable`
parameter, 2 always need to manually checked. When 2 is overlooked, it
causes issues like https://github.com/ruby/irb/pull/362
And there's 0 case where we may want to colorize even when the user
disables it. So I think we should merge 2 into `Color.colorable?` so it
can be automatically picked up.
* Add tests for all inspect modes
* Simplify inspectors' coloring logic
* Replace use_colorize? with Color.colorable?
* Remove Context#use_colorize cause it's redundant
1c53023ac4
1. `require` can mislead Ruby to load system irb's files and cause
constant redefined warnings as other code loads the same module/class
from lib folder.
2. Most files already use `require_relative`.
848d339f2e
The incompatible interface is not helpful, again if you want to use it
as a standalone library, falling it back to PP.
Original PP.pp also ends with `out << "\n"`.
4c74c7d84c
* moved rescue clause to `#inspect_value` to catch all failures in inspectors
* test with all (currently five kind of) inspect modes
- tweaked the input due to only `Marshal` can inspect(dump) a `BasicObject`
9d112fab8e
When you change this to true, you may need to add more tests.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
class methods to IRB::Inspector [ruby-core:51067][Bug #7598]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38542 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
object without #inspect defined. a patch from Daniel
Bovensiepen. [ruby-core:25200]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
