Consider showing warning messages about same-named aliases - either directly or perhaps via the "did you mean gem"
I file here rather than at https://github.com/yuki24/did_you_mean because I am not sure
if the site by Yuki Nishijima may be appropriate, so I think first ruby core has to
decide on this.
Consider the following code:
#!/usr/bin/ruby -w # =========================================================================== # class Foo def initialize unused_variable_warning = 42 bar end def bar puts 'hello from bar' end; alias bar1 bar alias bar2 bar alias bar3 bar alias bar3 bar end Foo.new
The output will be something like:
foo.rb:7: warning: assigned but unused variable - unused_variable_warning hello from bar
This is all fine. We get a warning, which is good.
My question is: should the same alias name also cause
It is probably unimportant because it is an alias to the very same
method anyway, but I was just wondering in general.
In my opinion it may be better to actually also show a warning
similar to unused variables. But I can not say since perhaps
people may prefer to not see any warning - I think that in most
cases, in the above, though, most people may have made a typo
or so. This is actually how I encountered this, I wanted to add
a new alias and noticed that I have had already two other, same
named aliases. It is no big deal but I was only wondering whether
the above behaviour to not show any warning was just an oversight
or whether it is deliberate.
Updated by znz (Kazuhiro NISHIYAMA) about 2 years ago
In following example,
ruby -w warns
duplicated_def only, but rubocop warns all combinations.
% cat /tmp/a.rb #!/usr/bin/ruby -w class Foo def m end def alias_after_def end alias alias_after_def m alias def_after_alias m def def_after_alias end alias duplicated_alias m alias duplicated_alias m def duplicated_def end def duplicated_def end end % ruby -w /tmp/a.rb /tmp/a.rb:9: warning: method redefined; discarding old alias_after_def /tmp/a.rb:6: warning: previous definition of alias_after_def was here /tmp/a.rb:22: warning: method redefined; discarding old duplicated_def /tmp/a.rb:19: warning: previous definition of duplicated_def was here % rubocop /tmp/a.rb Inspecting 1 file W Offenses: /tmp/a.rb:1:1: W: Script file a.rb doesn't have execute permission. #!/usr/bin/ruby -w ^^^^^^^^^^^^^^^^^^ /tmp/a.rb:2:1: C: Missing top-level class documentation comment. class Foo ^^^^^ /tmp/a.rb:3:3: C: Put empty method definitions on a single line. def m ... ^^^^^ /tmp/a.rb:6:3: C: Put empty method definitions on a single line. def alias_after_def ... ^^^^^^^^^^^^^^^^^^^ /tmp/a.rb:9:3: W: Method Foo#alias_after_def is defined at both /tmp/a.rb:6 and /tmp/a.rb:9. alias alias_after_def m ^^^^^ /tmp/a.rb:13:3: W: Method Foo#def_after_alias is defined at both /tmp/a.rb:11 and /tmp/a.rb:13. def def_after_alias ^^^ /tmp/a.rb:13:3: C: Put empty method definitions on a single line. def def_after_alias ... ^^^^^^^^^^^^^^^^^^^ /tmp/a.rb:17:3: W: Method Foo#duplicated_alias is defined at both /tmp/a.rb:16 and /tmp/a.rb:17. alias duplicated_alias m ^^^^^ /tmp/a.rb:19:3: C: Put empty method definitions on a single line. def duplicated_def ... ^^^^^^^^^^^^^^^^^^ /tmp/a.rb:22:3: W: Method Foo#duplicated_def is defined at both /tmp/a.rb:19 and /tmp/a.rb:22. def duplicated_def ^^^ /tmp/a.rb:22:3: C: Put empty method definitions on a single line. def duplicated_def ... ^^^^^^^^^^^^^^^^^^ 1 file inspected, 11 offenses detected