joe-sharp
commented
10 months ago Please let me know if the bug portion of this (_ stops working in IRB when entering debug mode) should be filed as a separate issue. Thanks!
Open joe-sharp opened 10 months ago
joe-sharp
commented
10 months ago Please let me know if the bug portion of this (_ stops working in IRB when entering debug mode) should be filed as a separate issue. Thanks!
joe-sharp
commented
10 months ago Additionally, please note in the "Session Variables" section of https://docs.ruby-lang.org/en/2.2.0/IRB.html#module-IRB-label-Commands that IRB also supports __ (double underscore) and __[line_no] when configured to do so. It always supports the single underscore for the last value though.
st0012
commented
10 months ago Please let me know if the bug portion of this (
_stops working in IRB when entering debug mode) should be filed as a separate issue. Thanks!
Yes please open a separate issue in IRB, thank you!
Your proposal
Pry and IRB have a feature in which
_is always set the the value of the last expression. While I realize it may not make sense to do this with debug commands, it would be nice if the feature was there at least for Ruby expressions. The current behavior seems to be setting_to the last error, but seemingly only for debug commands likels. This is kind of a bug in the irb_console since IRB has this feature normally but it stops working after entering debug mode.Additional context
Shell session:
```rb irb(#):001> 3+3
=> 6
irb(#):002> puts _
6
=> nil
irb(#):003> 4+4
=> 8
irb(#):004> info
(rdbg:irb) info
%self = #
@foo = "bar"
irb:rdbg(#):002> puts _
nil
irb:rdbg(#):003> 4+4
8
irb:rdbg(#):004> puts _
nil
irb:rdbg(#):005> 4+4
8
irb:rdbg(#):006> info
%self = #
_ = nil
@foo = "bar"
irb:rdbg(#):007> ls Bar
Traceback (most recent call last):
24: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:212:in `block in activate'
23: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:254:in `session_server_main'
22: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:365:in `process_event'
21: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:403:in `wait_command_loop'
20: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:403:in `loop'
19: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:404:in `block in wait_command_loop'
18: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:444:in `wait_command'
15: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:1981:in `intercept_trap_sigint'
4: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/irb_integration.rb:9:in `evaluate'
(irb):7:in `set_foo': uninitialized constant Foobar::Bar (NameError)`
irb:rdbg(#):008> puts _
uninitialized constant Foobar::Bar
nil
irb:rdbg(#):009> ls Bar
Traceback (most recent call last):
24: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:212:in `block in activate'
23: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:254:in `session_server_main'
22: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:365:in `process_event'
21: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:403:in `wait_command_loop'
20: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:403:in `loop'
19: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:404:in `block in wait_command_loop'
18: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:444:in `wait_command'
15: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/session.rb:1981:in `intercept_trap_sigint'
4: from /Users/joesharp/.asdf/installs/ruby/2.7.8/lib/ruby/gems/2.7.0/gems/debug-1.9.1/lib/debug/irb_integration.rb:9:in `evaluate'
(irb):9:in `set_foo': uninitialized constant Foobar::Bar (NameError)`
irb:rdbg(#):010> info
%self = #
_ = #
@foo = "bar"
irb:rdbg(#):011> Bar.methods
eval error: uninitialized constant Foobar::Bar
(rdbg)/scratch.rb:1:in `set_foo'`
nil
irb:rdbg(#):012> info
%self = #
_ = nil
@foo = "bar"
irb:rdbg(#):013> Bar.methods
eval error: uninitialized constant Foobar::Bar
(rdbg)/scratch.rb:1:in `set_foo'`
nil
irb:rdbg(#):014> puts _
nil
```