Add configure command

[mildm8nnered]

Experimental

Implements a configuration "wizard" for SwiftLint

This will scan the current directory for swift files, and offer the user the choice of which directories to include.

Then configure will scan the chosen directories for violations, and suggest a configuration that disables all currently violated rules.

% swiftlint help configure
OVERVIEW: Configure SwiftLint

USAGE: swiftlint configure [--color] [--no-color] [--auto] [--overwrite]

OPTIONS:
  --color                 Colorize output regardless of terminal settings.
  --no-color              Do not colorize output regardless of terminal settings.
  --auto                  Complete setup automatically.
  --overwrite             In automatic mode, overwrite any existing configuration.
  --version               Show the version.
  -h, --help              Show help information.

Sample session:

% swiftlint configure
Welcome to SwiftLint! Do you want to continue? (Y/n) 
Checking for existing .swiftlint.yml configuration file.
Found an existing .swiftlint.yml configuration file - Do you want to continue? (Y/n) 
Do you want to you want to keep any custom configurations from .swiftlint.yml (Y/n) 
Checking for any other .swiftlint.yml configuration files.
Found existing child configurations:

Tests/SwiftLintFrameworkTests/Resources/ProjectMock/NestedConfig/Test/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/NestedConfig/Test/Sub/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/ChildConfig/Cycle1/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/ChildConfig/Cycle2/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/ChildConfig/Cycle3/Main/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/ParentConfig/Cycle1/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/ParentConfig/Cycle2/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/ParentConfig/Cycle3/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/RemoteConfig/LocalRef/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/RemoteConfig/Cycle/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/Level1/Level2/.swiftlint.yml
Tests/SwiftLintFrameworkTests/Resources/ProjectMock/Level1/Level2/Level3/.swiftlint.yml

Do you want to continue? (Y/n) 
Checking for .swift files.
Found .swift files in the following top level directories:

Plugins
Source
Tests

Do you want SwiftLint to scan all of those directories? (Y/n) 
Checking for violations. This may take some time.
Linting Swift files in current working directory
625 of 625 [==============================] ETA: 0s (3 files/s)
+-----------------------------------------+--------+-------------+--------+----------+--------+------------------+-----------------+
| rule identifier                         | opt-in | correctable | custom | warnings | errors | total violations | number of files |
+-----------------------------------------+--------+-------------+--------+----------+--------+------------------+-----------------+
| explicit_type_interface                 | yes    | no          | no     |    3,811 |      0 |            3,811 |             527 |
| explicit_acl                            | yes    | no          | no     |    3,028 |      0 |            3,028 |             537 |
| indentation_width                       | yes    | no          | no     |    1,784 |      0 |            1,784 |             327 |
| prefer_nimble                           | yes    | no          | no     |      856 |      0 |              856 |              62 |
| explicit_top_level_acl                  | yes    | no          | no     |      729 |      0 |              729 |             466 |
| multiline_arguments_brackets            | yes    | no          | no     |      699 |      0 |              699 |             120 |
| required_deinit                         | yes    | no          | no     |      603 |      0 |              603 |             309 |
| no_magic_numbers                        | yes    | no          | no     |      517 |      0 |              517 |              92 |
| no_extension_access_modifier            | yes    | no          | no     |        0 |    511 |              511 |             262 |
| type_contents_order                     | yes    | no          | no     |      443 |      0 |              443 |             276 |
| implicit_return                         | yes    | yes         | no     |      369 |      0 |              369 |             149 |
| multiline_parameters_brackets           | yes    | no          | no     |      231 |      0 |              231 |              63 |
| multiline_arguments                     | yes    | no          | no     |      223 |      0 |              223 |              58 |
| anonymous_argument_in_multiline_closure | yes    | no          | no     |      208 |      0 |              208 |              67 |
| no_grouping_extension                   | yes    | no          | no     |      207 |      0 |              207 |             192 |
| file_types_order                        | yes    | no          | no     |      183 |      0 |              183 |              76 |
| missing_docs                            | yes    | no          | no     |      173 |      0 |              173 |              25 |
| superfluous_else                        | yes    | no          | no     |      140 |      0 |              140 |              56 |
| sorted_enum_cases                       | yes    | no          | no     |      115 |      0 |              115 |              26 |
| multiline_literal_brackets              | yes    | no          | no     |      110 |      0 |              110 |              28 |
| force_unwrapping                        | yes    | no          | no     |      109 |      0 |              109 |              37 |
| vertical_whitespace_between_cases       | yes    | yes         | no     |      100 |      0 |              100 |              42 |
| explicit_enum_raw_value                 | yes    | no          | no     |       84 |      0 |               84 |              15 |
| switch_case_on_newline                  | yes    | no          | no     |       78 |      0 |               78 |              14 |
| conditional_returns_on_newline          | yes    | no          | no     |       73 |      0 |               73 |              50 |
| trailing_closure                        | yes    | no          | no     |       72 |      0 |               72 |              44 |
| prefixed_toplevel_constant              | yes    | no          | no     |       57 |      0 |               57 |              32 |
| convenience_type                        | yes    | no          | no     |       56 |      0 |               56 |              51 |
| strict_fileprivate                      | yes    | no          | no     |       54 |      0 |               54 |              22 |
| prefer_self_in_static_references        | yes    | yes         | no     |       48 |      0 |               48 |              23 |
| multiline_parameters                    | yes    | no          | no     |       46 |      0 |               46 |              30 |
| multiline_function_chains               | yes    | no          | no     |       41 |      0 |               41 |              28 |
| discouraged_optional_collection         | yes    | no          | no     |       32 |      0 |               32 |              19 |
| file_name                               | yes    | no          | no     |       21 |      0 |               21 |              21 |
| function_default_parameter_at_end       | yes    | no          | no     |       16 |      0 |               16 |              11 |
| closure_body_length                     | yes    | no          | no     |       13 |      1 |               14 |               5 |
| todo                                    | no     | no          | no     |       11 |      0 |               11 |               8 |
| type_name                               | no     | no          | no     |        8 |      0 |                8 |               8 |
| redundant_self_in_closure               | yes    | yes         | no     |        6 |      0 |                6 |               3 |
| file_header                             | yes    | no          | no     |        5 |      0 |                5 |               5 |
| implicitly_unwrapped_optional           | yes    | no          | no     |        5 |      0 |                5 |               4 |
| empty_xctest_method                     | yes    | no          | no     |        1 |      0 |                1 |               1 |
| legacy_objc_type                        | yes    | no          | no     |        1 |      0 |                1 |               1 |
| self_binding                            | yes    | yes         | no     |        1 |      0 |                1 |               1 |
+-----------------------------------------+--------+-------------+--------+----------+--------+------------------+-----------------+
| Total                                   |        |             |        |   15,367 |    512 |           15,879 |             605 |
+-----------------------------------------+--------+-------------+--------+----------+--------+------------------+-----------------+

Do you want to disable all of the SwiftLint rules with existing violations? (Y/n) 

Do you want to disable all (3) of the deprecated rules? (Y/n) 

Do you want to enable all (5) of the analyzer rules? (Y/n) 

Do you want to use the default (xcode) reporter? (Y/n) 
Proposed configuration

included:
  - Plugins
  - Source
  - Tests
opt_in_rules:
  - all
analyzer_rules:
  - explicit_self
  - typesafe_array_init
  - unused_declaration
  - capture_variable
  - unused_import
disabled_rules:
  - anonymous_argument_in_multiline_closure
  - anyobject_protocol
  - closure_body_length
  - conditional_returns_on_newline
  - convenience_type
  - discouraged_optional_collection
  - empty_xctest_method
  - explicit_acl
  - explicit_enum_raw_value
  - explicit_top_level_acl
  - explicit_type_interface
  - file_header
  - file_name
  - file_types_order
  - force_unwrapping
  - function_default_parameter_at_end
  - implicit_return
  - implicitly_unwrapped_optional
  - indentation_width
  - inert_defer
  - legacy_objc_type
  - missing_docs
  - multiline_arguments
  - multiline_arguments_brackets
  - multiline_function_chains
  - multiline_literal_brackets
  - multiline_parameters
  - multiline_parameters_brackets
  - no_extension_access_modifier
  - no_grouping_extension
  - no_magic_numbers
  - prefer_nimble
  - prefer_self_in_static_references
  - prefixed_toplevel_constant
  - redundant_self_in_closure
  - required_deinit
  - self_binding
  - sorted_enum_cases
  - strict_fileprivate
  - superfluous_else
  - switch_case_on_newline
  - todo
  - trailing_closure
  - type_contents_order
  - type_name
  - unused_capture_list
  - vertical_whitespace_between_cases
analyzer_rules:
  - capture_variable
  - explicit_self
  - typesafe_array_init
  - unused_declaration
  - unused_import
reporter: xcode


attributes:
    severity: warning
    attributes_with_arguments_always_on_line_above: true
    always_on_same_line: ["@IBAction", "@NSManaged"]
    always_on_line_above: ["@ConfigurationElement", "@OptionGroup", "@RuleConfigurationDescriptionBuilder"]

balanced_xctest_lifecycle:
    severity: warning
    test_parent_classes: ["QuickSpec", "SwiftLintTestCase", "XCTestCase"]

empty_xctest_method:
    severity: warning
    test_parent_classes: ["QuickSpec", "SwiftLintTestCase", "XCTestCase"]

function_body_length:
    warning: 60

large_tuple:
    warning: 3

number_separator:
    severity: warning
    minimum_length: 5
    exclude_ranges: []

single_test_class:
    severity: warning
    test_parent_classes: ["QuickSpec", "SwiftLintTestCase", "XCTestCase"]

type_body_length:
    warning: 400

unused_import:
    severity: warning
    require_explicit_imports: false
    allowed_transitive_imports: []
    always_keep_imports: ["SwiftSyntaxBuilder", "SwiftLintFramework"]

Does that look good? (Y/n) 
Found an existing configuration.
Do you want to exit without overwriting the existing configuration? (Y/n) n
Do you want to overwrite the existing configuration? (Y/n) 
Saving configuration to .swiftlint.yml

[SwiftLintBot]

	1 Error
🚫	Could not build branch

	2 Warnings
⚠️	If this is a user-facing change, please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.
⚠️	This PR may need tests.

Here's an example of your CHANGELOG entry:

* Add configure command.  
  [mildm8nnered](https://github.com/mildm8nnered)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

note: There are two invisible spaces after the entry's text.

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