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Reduce warnings "mismatched indentations" on ruby 2.6 #1222

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unasuke commented Apr 12, 2018

⚠️ This pull-req is dependent #1221 . If you want to merge this, first, merge #1221 please.


In Ruby 2.6 with option "-w", introduce warning message "mismatched indentations" by following case-when syntax.

case foo
  when bar
    "do something"
  when baz
    "do something else"
    "do something or do nothing"

Fix to like this, warning message suppressed.

case foo
when bar
  "do something"
when baz
  "do something else"
  "do something or do nothing"


In some gem's test (that dependent to mail.gem) with "-w" option, output a ton of warning messages that makes test slow and hard to see the test results.


I know that this issue comes from auto generated ruby codes by ragel.
So "real fix" of this issue is making a patch to ragel (also I know!)

But...but, ragel is written in C. I couldn't fix the indentation issue.

Therefore, I add rufo gem as the development dependency and format in rake task to fix wrong (from ruby 2.6) case-when indents.


Can't fix by using rufo in some case of warning messages.

  • statement not reached
  • assigned but unused variable

unasuke and others added some commits Apr 12, 2018

Set full path of the ragel source file to rake task
In Rake v12.1.0 or higher, the algorithm of resolve file dependency
was changed in ruby/rake#39 .

Then rake task "ragel:generate" is works incorrectry that require
wrong ragel source file.
As the example, rake resolves "lib/mail/parsers/address_lists_parser.rb"
needs "lib/mail/parsers/address_lists.rl", but this file is not exist.

Therefore, fixed that to pass full path of the ragel source file
to rule.
Perform `gem install bundler` to address `LoadError: cannot load such
file -- bundler/dep_proxy`

bundle exec rake
bundler: failed to load command: rake (/home/travis/build/mikel/mail/vendor/bundle/ruby/2.5.0/bin/rake)
LoadError: cannot load such file -- bundler/dep_proxy
Set env "-w" to RUBYOPT
show warning messages from ruby on ci
Fix case-when indent in unicode.rb
Suppress warning message that enabled from ruby 2.6 .
Add rufo as development dependency
To format ruby files generated by ragel.
bundle exec rufo lib/mail/parsers/*.rb
To suppress warning messages from ruby
"mismatched indentations at 'when' with 'case'" .

@unasuke unasuke force-pushed the unasuke:reduce_warnings_on_ruby_2_6 branch from 197ecc3 to 6a246bc Apr 12, 2018


jeremy approved these changes Apr 13, 2018

@jeremy jeremy closed this in c8657d7 Apr 13, 2018

jeremy added a commit that referenced this pull request Apr 13, 2018

@unasuke unasuke deleted the unasuke:reduce_warnings_on_ruby_2_6 branch Apr 13, 2018


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unasuke commented Apr 13, 2018

@jeremy Thank you!!!l 😍

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