Layout-CaseIndentation.md

Pattern: Malformed case indentation

Issue: -

Description

This rule checks how the whens of a case expression are indented in relation to its case or end keyword.

It will register a separate offense for each misaligned when.

Examples

# If Layout/EndAlignment is set to keyword style (default)
# *case* and *end* should always be aligned to same depth,
# and therefore *when* should always be aligned to both -
# regardless of configuration.

# bad for all styles
case n
  when 0
    x * 2
  else
    y / 3
end

# good for all styles
case n
when 0
  x * 2
else
  y / 3
end

# if EndAlignment is set to other style such as
# start_of_line (as shown below), then *when* alignment
# configuration does have an effect.

# EnforcedStyle: case (default)

# bad
a = case n
when 0
  x * 2
else
  y / 3
end

# good
a = case n
    when 0
      x * 2
    else
      y / 3
end

# EnforcedStyle: end

# bad
a = case n
    when 0
      x * 2
    else
      y / 3
end

# good
a = case n
when 0
  x * 2
else
  y / 3
end

Default configuration

Attribute	Value
EnforcedStyle	case
SupportedStyles	case, end
IndentOneStep	false
IndentationWidth

Further Reading

• RuboCop - Layout/CaseIndentation
• https://github.com/bbatsov/ruby-style-guide#indent-when-to-case