Change nonsense return types to Nil in formatter classes (#10623)

src/mime/multipart/builder.cr

@@ -41,23 +41,23 @@ module MIME::Multipart
     # if `#body_part` is called before this method.
     #
     # Can be called multiple times to append to the preamble multiple times.
-    def preamble(string : String)
+    def preamble(string : String) : Nil
       preamble { |io| string.to_s(io) }
     end
 
     # Appends *data* to the preamble segment of the multipart message. Throws
     # if `#body_part` is called before this method.
     #
     # Can be called multiple times to append to the preamble multiple times.
-    def preamble(data : Bytes)
+    def preamble(data : Bytes) : Nil
       preamble { |io| io.write data }
     end
 
     # Appends *preamble_io* to the preamble segment of the multipart message.
     # Throws if `#body_part` is called before this method.
     #
     # Can be called multiple times to append to the preamble multiple times.
-    def preamble(preamble_io : IO)
+    def preamble(preamble_io : IO) : Nil
       preamble { |io| IO.copy(preamble_io, io) }
     end
 
@@ -74,21 +74,21 @@ module MIME::Multipart
     # Appends a body part to the multipart message with the given *headers*
     # and *string*. Throws if `#finish` or `#epilogue` is called before this
     # method.
-    def body_part(headers : HTTP::Headers, string : String)
+    def body_part(headers : HTTP::Headers, string : String) : Nil
       body_part_impl(headers) { |io| string.to_s(io) }
     end
 
     # Appends a body part to the multipart message with the given *headers*
     # and *data*. Throws if `#finish` or `#epilogue` is called before this
     # method.
-    def body_part(headers : HTTP::Headers, data : Bytes)
+    def body_part(headers : HTTP::Headers, data : Bytes) : Nil
       body_part_impl(headers) { |io| io.write data }
     end
 
     # Appends a body part to the multipart message with the given *headers*
     # and data from *body_io*. Throws if `#finish` or `#epilogue` is called
     # before this method.
-    def body_part(headers : HTTP::Headers, body_io : IO)
+    def body_part(headers : HTTP::Headers, body_io : IO) : Nil
       body_part_impl(headers) { |io| IO.copy(body_io, io) }
     end
 
@@ -102,7 +102,7 @@ module MIME::Multipart
     # Appends a body part to the multipart message with the given *headers*
     # and no body data. Throws is `#finish` or `#epilogue` is called before
     # this method.
-    def body_part(headers : HTTP::Headers)
+    def body_part(headers : HTTP::Headers) : Nil
       body_part_impl(headers, empty: true) { }
     end
 
@@ -131,7 +131,7 @@ module MIME::Multipart
     # appended.
     #
     # Can be called multiple times to append to the epilogue multiple times.
-    def epilogue(string : String)
+    def epilogue(string : String) : Nil
       epilogue { |io| string.to_s(io) }
     end
 
@@ -140,7 +140,7 @@ module MIME::Multipart
     # appended.
     #
     # Can be called multiple times to append to the epilogue multiple times.
-    def epilogue(data : Bytes)
+    def epilogue(data : Bytes) : Nil
       epilogue { |io| io.write data }
     end
 
@@ -149,7 +149,7 @@ module MIME::Multipart
     # been appended.
     #
     # Can be called multiple times to append to the epilogue multiple times.
-    def epilogue(epilogue_io : IO)
+    def epilogue(epilogue_io : IO) : Nil
       epilogue { |io| IO.copy(epilogue_io, io) }
     end
 

src/option_parser.cr

@@ -220,7 +220,7 @@ class OptionParser
   # before, and the flags registered after the call.
   #
   # This way, you can group the different options in an easier to read way.
-  def separator(message = "")
+  def separator(message = "") : Nil
     @flags << message.to_s
   end
 
@@ -259,7 +259,7 @@ class OptionParser
   # Stops the current parse and returns immediately, leaving the remaining flags
   # unparsed. This is treated identically to `--` being inserted *behind* the
   # current parsed flag.
-  def stop
+  def stop : Nil
     @stop = true
   end
 

src/pretty_print.cr

@@ -63,7 +63,7 @@ class PrettyPrint
   end
 
   # Appends a text element.
-  def text(obj)
+  def text(obj) : Nil
     obj = obj.to_s
     width = obj.size
     return if width == 0
@@ -84,7 +84,7 @@ class PrettyPrint
   end
 
   # Appends an element that can turn into a newline if necessary.
-  def breakable(sep = " ")
+  def breakable(sep = " ") : Nil
     width = sep.size
     group = @group_stack.last
     if group.break?
@@ -102,7 +102,7 @@ class PrettyPrint
 
   # Similar to `#breakable` except
   # the decision to break or not is determined individually.
-  def fill_breakable(sep = " ")
+  def fill_breakable(sep = " ") : Nil
     group { breakable sep }
   end
 
@@ -149,7 +149,7 @@ class PrettyPrint
   # text ","
   # breakable
   # ```
-  def comma
+  def comma : Nil
     text ","
     breakable
   end
@@ -249,7 +249,7 @@ class PrettyPrint
       @break = false
     end
 
-    def break
+    def break : Nil
       @break = true
     end
   end

src/string/formatter.cr

@@ -323,7 +323,7 @@ struct String::Formatter(A)
     pad size, flags
   end
 
-  def char(char)
+  def char(char) : Nil
     @io << char
   end
 

src/time.cr

@@ -1113,7 +1113,7 @@ struct Time
   #
   # Number of seconds decimals can be selected with *fraction_digits*.
   # Values accepted are 0 (the default, no decimals), 3 (milliseconds), 6 (microseconds) or 9 (nanoseconds).
-  def to_rfc3339(io : IO, *, fraction_digits : Int = 0)
+  def to_rfc3339(io : IO, *, fraction_digits : Int = 0) : Nil
     Format::RFC_3339.format(to_utc, io, fraction_digits)
   end
 

src/time/format/custom/iso_8601.cr

@@ -1,19 +1,19 @@
 struct Time::Format
   module Pattern
-    def date_time_iso_8601
+    def date_time_iso_8601 : Nil
       year_month_day_iso_8601
       char? 'T'
       time_iso_8601
     end
 
-    def time_iso_8601
+    def time_iso_8601 : Nil
       hour_minute_second_iso8601
       time_zone_z_or_offset
     end
   end
 
   struct Parser
-    def year_month_day_iso_8601
+    def year_month_day_iso_8601 : Nil
       year
       extended_format = char? '-'
       if current_char == 'W'
@@ -58,7 +58,7 @@ struct Time::Format
       end
     end
 
-    def hour_minute_second_iso8601
+    def hour_minute_second_iso8601 : Nil
       hour_24_zero_padded
       decimal_seconds = Time::SECONDS_PER_HOUR
 
@@ -106,7 +106,7 @@ struct Time::Format
   end
 
   struct Formatter
-    def year_month_day_iso_8601
+    def year_month_day_iso_8601 : Nil
       year_month_day
     end