REF update stylish haskell

.stylish-haskell.yaml

@@ -15,16 +15,91 @@ steps:
   #     # true.
   #     add_language_pragma: true
 
-  # Format record definitions
-  - records: {}
+  # Format module header
+  #
+  # Currently, this option is not configurable and will format all exports and
+  # module declarations to minimize diffs
+  #
+  # - module_header:
+  #     # How many spaces use for indentation in the module header.
+  #     indent: 4
+  #
+  #     # Should export lists be sorted?  Sorting is only performed within the
+  #     # export section, as delineated by Haddock comments.
+  #     sort: true
+  #
+  #     # See `separate_lists` for the `imports` step.
+  #     separate_lists: true
+
+  # Format record definitions. This is disabled by default.
+  #
+  # You can control the layout of record fields. The only rules that can't be configured
+  # are these:
+  #
+  # - "|" is always aligned with "="
+  # - "," in fields is always aligned with "{"
+  # - "}" is likewise always aligned with "{"
+  #
+  # - records:
+  #     # How to format equals sign between type constructor and data constructor.
+  #     # Possible values:
+  #     # - "same_line" -- leave "=" AND data constructor on the same line as the type constructor.
+  #     # - "indent N" -- insert a new line and N spaces from the beginning of the next line.
+  #     equals: "indent 2"
+  #
+  #     # How to format first field of each record constructor.
+  #     # Possible values:
+  #     # - "same_line" -- "{" and first field goes on the same line as the data constructor.
+  #     # - "indent N" -- insert a new line and N spaces from the beginning of the data constructor
+  #     first_field: "indent 2"
+  #
+  #     # How many spaces to insert between the column with "," and the beginning of the comment in the next line.
+  #     field_comment: 2
+  #
+  #     # How many spaces to insert before "deriving" clause. Deriving clauses are always on separate lines.
+  #     deriving: 2
+  #
+  #     # How many spaces to insert before "via" clause counted from indentation of deriving clause
+  #     # Possible values:
+  #     # - "same_line" -- "via" part goes on the same line as "deriving" keyword.
+  #     # - "indent N" -- insert a new line and N spaces from the beginning of "deriving" keyword.
+  #     via: "indent 2"
+  #
+  #     # Sort typeclass names in the "deriving" list alphabetically.
+  #     sort_deriving: true
+  #
+  #     # Wheter or not to break enums onto several lines
+  #     #
+  #     # Default: false
+  #     break_enums: false
+  #
+  #     # Whether or not to break single constructor data types before `=` sign
+  #     #
+  #     # Default: true
+  #     break_single_constructors: true
+  #
+  #     # Whether or not to curry constraints on function.
+  #     #
+  #     # E.g: @allValues :: Enum a => Bounded a => Proxy a -> [a]@
+  #     #
+  #     # Instead of @allValues :: (Enum a, Bounded a) => Proxy a -> [a]@
+  #     #
+  #     # Default: false
+  #     curried_context: false
 
   # Align the right hand side of some elements.  This is quite conservative
   # and only applies to statements where each element occupies a single
-  # line. All default to true.
+  # line.
+  # Possible values:
+  # - always - Always align statements.
+  # - adjacent - Align statements that are on adjacent lines in groups.
+  # - never - Never align statements.
+  # All default to always.
   - simple_align:
-      cases: true
-      top_level_patterns: true
-      records: true
+      cases: always
+      top_level_patterns: always
+      records: always
+      multi_way_if: always
 
   # Import cleanup
   - imports:
@@ -76,6 +151,11 @@ steps:
       #   > import qualified Data.List      as List
       #   >     (concat, foldl, foldr, head, init, last, length)
       #
+      # - repeat: Repeat the module name to align the import list.
+      #
+      #   > import qualified Data.List      as List (concat, foldl, foldr, head)
+      #   > import qualified Data.List      as List (init, last, length)
+      #
       # Default: after_alias
       list_align: after_alias
 
@@ -178,6 +258,22 @@ steps:
       # Default: false
       space_surround: false
 
+      # Enabling this argument will use the new GHC lib parse to format imports.
+      #
+      # This currently assumes a few things, it will assume that you want post
+      # qualified imports. It is also not as feature complete as the old
+      # imports formatting.
+      #
+      # It does not remove redundant lines or merge lines. As such, the full
+      # feature scope is still pending.
+      #
+      # It _is_ however, a fine alternative if you are using features that are
+      # not parseable by haskell src extensions and you're comfortable with the
+      # presets.
+      #
+      # Default: false
+      ghc_lib_parser: false
+
   # Language pragmas
   - language_pragmas:
       # We can generate different styles of language pragma lists.
@@ -225,9 +321,6 @@ steps:
   # simple_align but is a bit less conservative.
   # - squash: {}
 
-# A common indentation setting. Different steps take this into account.
-indent: 4
-
 # A common setting is the number of columns (parts of) code will be wrapped
 # to. Different steps take this into account.
 #