Automate list of differing defaults for styles (#874)

Update docstrings of BlueStyle, SciMLStyle, and YASStyle to contain the
computed list of options that are different from DefaultStyle.

src/JuliaFormatter.jl

@@ -138,6 +138,18 @@ include("fst.jl")
 include("passes.jl")
 include("align.jl")
 
+function list_different_defaults(style)
+    options_style = pairs(options(style))
+    options_default = pairs(options(DefaultStyle()))
+    options_changed = setdiff(options_style, options_default)
+    sort!(options_changed; by = first)
+    io = IOBuffer()
+    for (key, val) in options_changed
+        println(io, "- `$key` = $val")
+    end
+    String(take!(io))
+end
+
 include("styles/default/pretty.jl")
 include("styles/default/nest.jl")
 include("styles/yas/pretty.jl")

src/styles/blue/pretty.jl

@@ -1,25 +1,3 @@
-"""
-    BlueStyle()
-
-Formatting style based on [BlueStyle](https://github.com/invenia/BlueStyle)
-and [JuliaFormatter#283](https://github.com/domluna/JuliaFormatter.jl/issues/283).
-
-!!! note
-    This style is still work-in-progress, and does not yet implement all of the
-    BlueStyle guide.
-
-Configurable options with different defaults to [`DefaultStyle`](@ref) are:
-- `always_use_return` = true
-- `short_to_long_function_def` = true
-- `whitespace_ops_in_indices` = true
-- `remove_extra_newlines` = true
-- `always_for_in` = true
-- `import_to_using` = true
-- `pipe_to_function_call` = true
-- `whitespace_in_kwargs` = false
-- `annotate_untyped_fields_with_any` = false
-- `separate_kwargs_with_semicolon` = true
-"""
 struct BlueStyle <: AbstractStyle
     innerstyle::AbstractStyle
 end
@@ -59,6 +37,21 @@ function options(style::BlueStyle)
     )
 end
 
+@doc """
+    BlueStyle()
+
+Formatting style based on [BlueStyle](https://github.com/invenia/BlueStyle)
+and [JuliaFormatter#283](https://github.com/domluna/JuliaFormatter.jl/issues/283).
+
+!!! note
+    This style is still work-in-progress, and does not yet implement all of the
+    BlueStyle guide.
+
+Configurable options with different defaults to [`DefaultStyle`](@ref) are:
+$(list_different_defaults(BlueStyle()))
+"""
+BlueStyle
+
 function is_binaryop_nestable(::BlueStyle, cst::CSTParser.EXPR)
     is_assignment(cst) && is_iterable(cst[end]) && return false
     return is_binaryop_nestable(DefaultStyle(), cst)

src/styles/sciml/pretty.jl

@@ -1,18 +1,3 @@
-"""
-    SciMLStyle()
-
-Formatting style based on [SciMLStyle](https://github.com/SciML/SciMLStyle).
-
-!!! note
-    This style is still work-in-progress.
-
-Configurable options with different defaults to [`DefaultStyle`](@ref) are:
-- `whitespace_ops_in_indices` = true
-- `remove_extra_newlines` = true
-- `always_for_in` = true
-- `whitespace_typedefs` = true,
-- `normalize_line_endings` = "unix"
-"""
 struct SciMLStyle <: AbstractStyle
     innerstyle::AbstractStyle
 end
@@ -53,6 +38,19 @@ function options(style::SciMLStyle)
     )
 end
 
+@doc """
+    SciMLStyle()
+
+Formatting style based on [SciMLStyle](https://github.com/SciML/SciMLStyle).
+
+!!! note
+    This style is still work-in-progress.
+
+Configurable options with different defaults to [`DefaultStyle`](@ref) are:
+$(list_different_defaults(SciMLStyle()))
+"""
+SciMLStyle
+
 function is_binaryop_nestable(::SciMLStyle, cst::CSTParser.EXPR)
     (CSTParser.defines_function(cst) || is_assignment(cst)) && return false
     ((cst[2]::CSTParser.EXPR).val in ("=>", "->", "in")) && return false

src/styles/yas/pretty.jl

@@ -1,21 +1,3 @@
-"""
-    YASStyle()
-
-Formatting style based on [YASGuide](https://github.com/jrevels/YASGuide)
-and [JuliaFormatter#198](https://github.com/domluna/JuliaFormatter.jl/issues/198).
-
-Configurable options with different defaults to [`DefaultStyle`](@ref) are:
-- `always_for_in` = true
-- `whitespace_ops_in_indices` = true
-- `remove_extra_newlines` = true
-- `import_to_using` = true
-- `pipe_to_function_call` = true
-- `short_to_long_function_def` = true
-- `always_use_return` = true
-- `whitespace_in_kwargs` = false
-- `join_lines_based_on_source` = true
-- `separate_kwargs_with_semicolon` = true
-"""
 struct YASStyle <: AbstractStyle
     innerstyle::AbstractStyle
 end
@@ -55,6 +37,17 @@ function options(style::YASStyle)
     )
 end
 
+@doc """
+    YASStyle()
+
+Formatting style based on [YASGuide](https://github.com/jrevels/YASGuide)
+and [JuliaFormatter#198](https://github.com/domluna/JuliaFormatter.jl/issues/198).
+
+Configurable options with different defaults to [`DefaultStyle`](@ref) are:
+$(list_different_defaults(YASStyle()))
+"""
+YASStyle
+
 function is_binaryop_nestable(::YASStyle, cst::CSTParser.EXPR)
     (CSTParser.defines_function(cst) || is_assignment(cst)) && return false
     (cst[2].val == "=>" || cst[2].val == "->") && return false