grokify/mime-builder-ruby

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lib/mime_builder/file.rb

Summary

Maintainability
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Favor modifier if usage when having a single-line body. Another good alternative is the usage of control flow &&/||.
Open

      if filename.to_s.length > 0
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

Checks for if and unless statements that would fit on one line if written as a modifier if/unless. The maximum line length is configured in the Metrics/LineLength cop.

Example:

# bad
if condition
  do_stuff(bar)
end

unless qux.empty?
  Foo.do_something
end

# good
do_stuff(bar) if condition
Foo.do_something unless qux.empty?

Favor a normal if-statement over a modifier clause in a multiline statement.
Open

      @mime.headers.set(
        'Content-Disposition',
        get_attachment_content_disposition(filepath)
      ) if is_attachment
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

Checks for uses of if/unless modifiers with multiple-lines bodies.

Example:

# bad
{
  result: 'this should not happen'
} unless cond

# good
{ result: 'ok' } if cond

Use the return of the conditional for variable assignment and comparison.
Open

      if opts.key?(:base64_encode) && opts[:base64_encode]
        @base64_encode = true
      else
        @base64_encode = false
      end
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

Use !empty? instead of length > 0.
Open

      if filename.to_s.length > 0
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

This cop checks for numeric comparisons that can be replaced by a predicate method, such as receiver.length == 0, receiver.length > 0, receiver.length != 0, receiver.length < 1 and receiver.size == 0 that can be replaced by receiver.empty? and !receiver.empty.

Example:

# bad
[1, 2, 3].length == 0
0 == "foobar".length
array.length < 1
{a: 1, b: 2}.length != 0
string.length > 0
hash.size > 0

# good
[1, 2, 3].empty?
"foobar".empty?
array.empty?
!{a: 1, b: 2}.empty?
!string.empty?
!hash.empty?

Missing top-level class documentation comment.
Open

  class Filepath
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

This cop checks for missing top-level documentation of classes and modules. Classes with no body are exempt from the check and so are namespace modules - modules that have nothing in their bodies except classes, other modules, or constant definitions.

The documentation requirement is annulled if the class or module has a "#:nodoc:" comment next to it. Likewise, "#:nodoc: all" does the same for all its children.

Example:

# bad
class Person
  # ...
end

# good
# Description/Explanation of Person class
class Person
  # ...
end

Closing method call brace must be on the line after the last argument when opening brace is on a separate line from the first argument.
Open

        get_file_content_type(filepath, opts[:content_type]))
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

This cop checks that the closing brace in a method call is either on the same line as the last method argument, or a new line.

When using the symmetrical (default) style:

If a method call's opening brace is on the same line as the first argument of the call, then the closing brace should be on the same line as the last argument of the call.

If an method call's opening brace is on the line above the first argument of the call, then the closing brace should be on the line below the last argument of the call.

When using the new_line style:

The closing brace of a multi-line method call must be on the line after the last argument of the call.

When using the same_line style:

The closing brace of a multi-line method call must be on the same line as the last argument of the call.

Example:

# symmetrical: bad
  # new_line: good
  # same_line: bad
  foo(a,
    b
  )

  # symmetrical: bad
  # new_line: bad
  # same_line: good
  foo(
    a,
    b)

  # symmetrical: good
  # new_line: bad
  # same_line: good
  foo(a,
    b)

  # symmetrical: good
  # new_line: good
  # same_line: bad
  foo(
    a,
    b
  )

Always use raise to signal exceptions.
Open

        fail "File \"#{filepath}\" does not exist or cannot be read"
Severity: Minor
Found in lib/mime_builder/file.rb by rubocop

This cop checks for uses of fail and raise.

Example: EnforcedStyle: only_raise (default)

# The `only_raise` style enforces the sole use of `raise`.
# bad
begin
  fail
rescue Exception
  # handle it
end

def watch_out
  fail
rescue Exception
  # handle it
end

Kernel.fail

# good
begin
  raise
rescue Exception
  # handle it
end

def watch_out
  raise
rescue Exception
  # handle it
end

Kernel.raise

Example: EnforcedStyle: only_fail

# The `only_fail` style enforces the sole use of `fail`.
# bad
begin
  raise
rescue Exception
  # handle it
end

def watch_out
  raise
rescue Exception
  # handle it
end

Kernel.raise

# good
begin
  fail
rescue Exception
  # handle it
end

def watch_out
  fail
rescue Exception
  # handle it
end

Kernel.fail

Example: EnforcedStyle: semantic

# The `semantic` style enforces the use of `fail` to signal an
# exception, then will use `raise` to trigger an offense after
# it has been rescued.
# bad
begin
  raise
rescue Exception
  # handle it
end

def watch_out
  # Error thrown
rescue Exception
  fail
end

Kernel.fail
Kernel.raise

# good
begin
  fail
rescue Exception
  # handle it
end

def watch_out
  fail
rescue Exception
  raise 'Preferably with descriptive message'
end

explicit_receiver.fail
explicit_receiver.raise

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