Specify rbs syntax to code snippets in Markdown files

docs/CONTRIBUTING.md

@@ -69,7 +69,7 @@ We define the standard members order so that ordering doesn't bother reading dif
 5. `public` & public instance methods
 6. `private` & private instance methods
 
-```
+```rbs
 class HelloWorld[X]
   def self.new: [A] () { (void) -> A } -> HelloWorld[A]         # new or initialize comes first
   def initialize: () -> void

docs/rbs_by_example.md

@@ -6,20 +6,20 @@ The purpose of this doc is to teach you how to write RBS signatures by using the
 
 ## Examples
 
+In each example, the first snippet is for *Ruby* and the second one is for *RBS*.
+
 ### Zero argument methods
 
 **Example:** `String#empty?`
 
 ```ruby
-# .rb
 "".empty?
 # => true
 "hello".empty?
 # => false
 ```
 
-```ruby
-# .rbs
+```rbs
 class String
   def empty?: () -> bool
 end
@@ -32,14 +32,13 @@ end
 **Example:** `String#include?`
 
 ```ruby
-# .rb
 "homeowner".include?("house")
 # => false
 "homeowner".include?("meow")
 # => true
 ```
 
-```ruby
+```rbs
 class String
   def include?: (String) -> bool
 end
@@ -53,7 +52,6 @@ boolean value
 **Example:** `String#end_with?`
 
 ```ruby
-# .rb
 "hello?".end_with?("!")
 # => false
 "hello?".end_with?("?")
@@ -64,8 +62,7 @@ boolean value
 # => false
 ```
 
-```ruby
-# .rbs
+```rbs
 class String
   def end_with?: (*String) -> bool
 end
@@ -79,7 +76,6 @@ returns a boolean value.
 **Example:** `String#ljust`
 
 ```ruby
-# .rb
 "hello".ljust(4)
 #=> "hello"
 "hello".ljust(20)
@@ -88,8 +84,7 @@ returns a boolean value.
 #=> "hello123412341234123"
 ```
 
-```ruby
-# .rbs
+```rbs
 class String
   def ljust: (Integer, ?String) -> String
 end
@@ -102,7 +97,6 @@ end
 **Example:** `Array#*`
 
 ```ruby
-# .rb
 [1, 2, 3] * ","
 # => "1,2,3"
 [1, 2, 3] * 2
@@ -112,8 +106,7 @@ end
 *Note:* Some of the signatures after this point include type variables (e.g. `Elem`, `T`).
 For now, it's safe to ignore them, but they're included for completeness.
 
-```ruby
-# .rbs
+```rbs
 class Array[Elem]
   def *: (String) -> String
        | (Integer) -> Array[Elem]
@@ -128,16 +121,14 @@ end
 **Example:** `String#<<`
 
 ```ruby
-# .rb
 a = "hello "
 a << "world"
 #=> "hello world"
 a << 33
 #=> "hello world!"
 ```
 
-```ruby
-# .rbs
+```rbs
 class String
   def <<: (String | Integer) -> String
 end
@@ -148,7 +139,6 @@ end
 ### Nilable types
 
 ```ruby
-# .rb
 [1, 2, 3].first
 # => 1
 [].first
@@ -159,8 +149,7 @@ end
 # => []
 ```
 
-```ruby
-# .rbs
+```rbs
 class Enumerable[Elem]
   def first: () -> Elem?
            | (Integer) -> Array[Elem]
@@ -183,7 +172,6 @@ The `?` syntax is a convenient shorthand for a union with nil. An equivalent uni
 **Example**: `String#lines`
 
 ```ruby
-# .rb
 "hello\nworld\n".lines
 # => ["hello\n", "world\n"]
 "hello  world".lines(' ')
@@ -192,8 +180,7 @@ The `?` syntax is a convenient shorthand for a union with nil. An equivalent uni
 # => ["hello", "world"]
 ```
 
-```ruby
-# .rbs
+```rbs
 class String
   def lines: (?String, ?chomp: bool) -> Array[String]
 end
@@ -209,12 +196,11 @@ Keyword arguments are declared similar to in ruby, with the keyword immediately
 **Example**: `Time.now`
 
 ```ruby
-# .rb
 Time.now
 # => 2009-06-24 12:39:54 +0900
 ```
 
-```ruby
+```rbs
 class Time
   def self.now: () -> Time
 end
@@ -228,16 +214,14 @@ end
 **Example**: `Array#filter`
 
 ```ruby
-# .rb
 [1,2,3,4,5].filter {|num| num.even? }
 # => [2, 4]
 %w[ a b c d e f ].filter {|v| v =~ /[aeiou]/ }
 # => ["a", "e"]
 [1,2,3,4,5].filter
 ```
 
-```ruby
-# .rbs
+```rbs
 class Array[Elem]
   def filter: () { (Elem) -> boolish } -> ::Array[Elem]
             | () -> ::Enumerator[Elem, ::Array[Elem]]
@@ -260,8 +244,7 @@ h.keys
 # => ["a", "b", "c", "d"]
 ```
 
-```ruby
-# .rbs
+```rbs
 class Hash[K, V]
   def keys: () -> Array[K]
 end
@@ -273,16 +256,14 @@ Generic types in RBS are parameterized at declaration time. These type variables
 
 
 ```ruby
-# .rb
 a = [ "a", "b", "c", "d" ]
 a.collect {|x| x + "!"}
 # => ["a!", "b!", "c!", "d!"]
 a.collect.with_index {|x, i| x * i}
 # => ["", "b", "cc", "ddd"]
 ```
 
-```ruby
-# .rbs
+```rbs
 class Array[Elem]
   def collect: [U] () { (Elem) -> U } -> Array[U]
              | () -> Enumerator[Elem, Array[untyped]]
@@ -302,7 +283,7 @@ In this example, the method receives its signature from the inferred return type
 # => [[2, 4, 6], [1, 3, 5]]
 ```
 
-```ruby
+```rbs
 class Enumerable[Elem]
   def partition: () { (Elem) -> boolish } -> [Array[Elem], Array[Elem]]
                | () -> ::Enumerator[Elem, [Array[Elem], Array[Elem] ]]
@@ -318,7 +299,7 @@ Tuples can be of any size, and they can have mixed types.
 # => {1=>1, 2=>4, 3=>9, 4=>16, 5=>25}
 ```
 
-```ruby
+```rbs
 class Enumerable[Elem]
   def to_h: () -> ::Hash[untyped, untyped]
           | [T, U] () { (Elem) -> [T, U] } -> ::Hash[T, U]

docs/repo.md

@@ -13,7 +13,7 @@ Assume there is a rubygem called `bug-free-doodle` and our application depends o
 
 One workaround is to add type definitions of the library in the application signatures.
 
-```
+```rbs
 # sig/polyfill/bug-free-doodle.rbs
 
 module Bug

docs/sigs.md

@@ -18,7 +18,7 @@ See [syntax guide](syntax.md).
 When you finish writing signature, you may want to test the signature.
 rbs provides a feature to test your signature.
 
-```
+```console
 $ RBS_TEST_TARGET='Foo::*' bundle exec ruby -r rbs/test/setup test/foo_test.rb
 ```
 
@@ -74,7 +74,7 @@ The `rbs` test framework tries to the best error message for overloaded methods
 
 The error is reported when a method is defined multiple times, as RBS does not allow duplicate method definitions. When you need to overload a method, use the `...` syntax:
 
-```ruby
+```rbs
 # First definition
 class C
   def foo: () -> untyped
@@ -99,14 +99,14 @@ The design of the signature testing aims to be non-intrusive. The setup is done
 You need to require `rbs/test/setup` for signature testing.
 You can do it using `-r` option through command line argument or the `RUBYOPT` environment variable.
 
-```
+```console
 $ ruby -r rbs/test/setup run_tests.rb
 $ RUBYOPT='-rrbs/test/setup' rake test
 ```
 
 When you are using Bundler, you may need to require `bundler/setup` explicitly.
 
-```
+```console
 $ RUBYOPT='-rbundler/setup -rrbs/test/setup' bundle exec rake test
 ```
 
@@ -130,7 +130,7 @@ You need to specify `RBS_TEST_TARGET` to run the test, and you can customize the
 You may need to specify `-r` or `-I` to load signatures.
 The default is `-I sig`.
 
-```
+```shell
 RBS_TEST_OPT='-r pathname -I sig'
 ```
 
@@ -144,7 +144,7 @@ You can see the backtrace how the type error is caused and debug your program or
 
 So, a typical command line to start the test would look like the following:
 
-```
+```console
 $ RBS_TEST_LOGLEVEL=error \
   RBS_TEST_TARGET='Kaigi::*' \
   RBS_TEST_SKIP='Kaigi::MonkeyPatch' \
@@ -160,7 +160,7 @@ $ RBS_TEST_LOGLEVEL=error \
 
 You can skip installing the instrumentation per-method basis using `rbs:test:skip` annotation.
 
-```
+```rbs
 class String
   %a{rbs:test:skip} def =~: (Regexp) -> Integer?
 end

docs/stdlib.md

@@ -10,7 +10,7 @@ We support writing tests for core/stdlib signatures.
 
 First, execute `generate:stdlib_test` rake task with a class name that you want to test.
 
-```bash
+```console
 $ bundle exec rake 'generate:stdlib_test[String]'
 Created: test/stdlib/String_test.rb
 ```
@@ -83,7 +83,7 @@ If the execution of the program escape from the class definition, the instrument
 
 You can run the test with:
 
-```
+```console
 $ bundle exec rake stdlib_test                # Run all tests
 $ bundle exec ruby test/stdlib/String_test.rb # Run specific tests
 ```