Extract shared logic between json config and editorconfig.

src/Fantomas.Tests/Fantomas.Tests.fsproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <Import Project="..\netfx.props" />
   <PropertyGroup>
     <Version>3.2.0-beta-002</Version>
@@ -57,7 +57,8 @@
     <Compile Include="ElmishTests.fs" />
     <Compile Include="LambdaTests.fs" />
     <Compile Include="IfThenElseTests.fs" />
-    <Compile Include="FormatConfigConfigurationFileTests.fs" />
+    <Compile Include="FormatConfigJsonConfigurationFileTests.fs" />
+    <Compile Include="FormatConfigEditorConfigurationFileTests.fs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Fantomas\Fantomas.fsproj" />

src/Fantomas.Tests/FormatConfigEditorConfigurationFileTests.fs

@@ -0,0 +1,2 @@
+module Fantomas.Tests.FormatConfigEditorConfigurationFileTests
+

src/Fantomas.Tests/FormatConfigConfigurationFileTests.fs → src/Fantomas.Tests/FormatConfigJsonConfigurationFileTests.fs

@@ -1,4 +1,4 @@
-module Fantomas.Tests.FormatConfigConfigurationFileTests
+module Fantomas.Tests.FormatConfigJsonConfigurationFileTests
 
 open System
 open Fantomas
@@ -7,7 +7,8 @@ open NUnit.Framework
 open System.IO
 open Fantomas.Tests.TestHelper
 
-let private getTempFolder () = Path.GetTempPath()
+[<Literal>]
+let private configFileName ="fantomas-config.json"
 
 let private configToJson config =
     Reflection.getRecordFields config
@@ -24,24 +25,12 @@ let private configToJson config =
     |> String.concat ",\n  "
     |> sprintf "{ %s }"
 
-let private mkConfigPath folder =
-    match folder with
-    | Some folder ->
-        let folderPath = Path.Combine(getTempFolder(), folder)
-        Directory.CreateDirectory(folderPath) |> ignore
-        Path.Combine(folderPath, "fantomas-config.json")
-    | None ->
-        Path.Combine(getTempFolder(), "fantomas-config.json")
-let private mkConfig folder fantomasConfig =
-    let file = mkConfigPath folder
-    let content = configToJson fantomasConfig
-    File.WriteAllText(file, content)
-    file
-
-let private mkConfigFromJson folder json =
-    let file = mkConfigPath folder
-    File.WriteAllText(file, json)
-    file
+let private mkConfig subFolder config =
+    let json = configToJson config
+    mkConfigFromContent configFileName subFolder json
+
+let private mkConfigFromJson subFolder json =
+    mkConfigFromContent configFileName subFolder json
 
 let rec private delete fileOrFolder =
     if File.Exists(fileOrFolder) then
@@ -54,6 +43,10 @@ let rec private delete fileOrFolder =
         ()
 let private uniqueString () = System.Guid.NewGuid().ToString("N")
 
+let private applyOptionsToConfig config path =
+    let json = File.ReadAllText path
+    let options, warnings = JsonConfig.parseOptionsFromJson json
+    FormatConfig.applyOptions(config, options),warnings
 
 [<Test>]
 let ``single configuration file`` () =
@@ -101,24 +94,24 @@ let ``pointing to config in a subfolder should return parent config file as well
 [<Test>]
 let ``simple config file parses valid option`` () =
     let path = mkConfigFromJson None "{\"KeepNewlineAfter\":true}"
-    let config, warnings = ConfigFile.applyOptionsToConfig FormatConfig.Default path
+    let config, warnings = applyOptionsToConfig FormatConfig.Default path
     true == config.KeepNewlineAfter
     [] == warnings
 
 [<Test>]
 let ``keys should not necessarily have quotes to be parsed`` () =
     let path = mkConfigFromJson None "{KeepNewlineAfter:true}"
-    let config, warnings = ConfigFile.applyOptionsToConfig FormatConfig.Default path
+    let config, warnings = applyOptionsToConfig FormatConfig.Default path
     true == config.KeepNewlineAfter
     [] == warnings
 
 [<Test>]
 let ``invalid option returns a warning`` () =
     let path = mkConfigFromJson None "{ \"Foo\": true }"
-    let config, warnings = ConfigFile.applyOptionsToConfig FormatConfig.Default path
+    let config, warnings = applyOptionsToConfig FormatConfig.Default path
     config == FormatConfig.Default
     match warnings with
-    | [ error ] ->
+    | [| error |] ->
         StringAssert.IsMatch("\"Foo\":true is no valid setting for Fantomas v(.*)", error)
     | _ -> fail()
 
@@ -176,20 +169,7 @@ let ``$schema key should not return warning`` () =
     "IndentOnTryWith": true
 }
 """
-    let _, warnings = ConfigFile.applyOptionsToConfig FormatConfig.Default path
-    [] == warnings
-
-/// Ok to remove test once ReorderOpenDeclaration is removed from the code-base
-
-[<Test>]
-let ``configuration with ReorderOpenDeclaration should return a warning`` () =
-    let path = mkConfigFromJson None """
-{
-    "ReorderOpenDeclaration": true
-}
-"""
-    let _, warnings = ConfigFile.applyOptionsToConfig FormatConfig.Default path
-    match warnings with
-    | [ reorderWarning ] ->
-        StringAssert.IsMatch("ReorderOpenDeclaration will be deprecated in the next major version. Using this feature can lead to compilation errors after formatting.", reorderWarning)
-    | _ -> fail()
+    let _, warnings =
+        File.ReadAllText path
+        |> JsonConfig.parseOptionsFromJson
+    [] == warnings

src/Fantomas.Tests/TestHelpers.fs

@@ -9,6 +9,7 @@ open FSharp.Compiler.Ast
 open FSharp.Compiler.Range
 open NUnit.Framework
 open FsCheck
+open System.IO
 
 let config = FormatConfig.Default
 let newline = "\n"
@@ -180,3 +181,19 @@ type NUnitRunner () =
                 // TODO : Log more information about the test failure.
                 Runner.onFinishedToString name result
                 |> Assert.Fail
+
+let private getTempFolder () = Path.GetTempPath()
+
+let private mkConfigPath fileName folder =
+    match folder with
+    | Some folder ->
+        let folderPath = Path.Combine(getTempFolder(), folder)
+        Directory.CreateDirectory(folderPath) |> ignore
+        Path.Combine(folderPath, fileName)
+    | None ->
+        Path.Combine(getTempFolder(), fileName)
+
+let mkConfigFromContent fileName folder content =
+    let file = mkConfigPath fileName folder
+    File.WriteAllText(file, content)
+    file

src/Fantomas/CodeFormatter.fs

@@ -1,8 +1,5 @@
 namespace Fantomas
 
-open Fantomas
-open FormatConfig
-
 [<Sealed>]
 type CodeFormatter =
     static member ParseAsync(fileName, source, parsingOptions, checker) =
@@ -35,23 +32,6 @@ type CodeFormatter =
     static member MakeRange(fileName, startLine, startCol, endLine, endCol) = 
         CodeFormatterImpl.makeRange fileName startLine startCol endLine endCol
 
-    static member GetVersion() = Fantomas.Version.fantomasVersion.Value
-
-    static member ReadConfiguration(fileOrFolder) =
-        try
-            let configurationFiles =
-                ConfigFile.findConfigurationFiles fileOrFolder
-
-            if List.isEmpty configurationFiles then failwithf "No configuration files were found for %s" fileOrFolder
-
-            let (config,warnings) =
-                List.fold (fun (currentConfig, warnings) configPath ->
-                    let updatedConfig, warningsForPath = ConfigFile.applyOptionsToConfig currentConfig configPath
-                    (updatedConfig, warnings @ warningsForPath)
-                ) (FormatConfig.Default, []) configurationFiles
+    static member GetVersion() = Version.fantomasVersion.Value
 
-            match warnings with
-            | [] -> FormatConfigFileParseResult.Success config
-            | w -> FormatConfigFileParseResult.PartialSuccess (config, w)
-        with
-        | exn -> FormatConfigFileParseResult.Failure exn
+    static member ReadConfiguration(fileOrFolder) = CodeFormatterImpl.readConfiguration fileOrFolder

src/Fantomas/CodeFormatterImpl.fs

@@ -669,4 +669,36 @@ type internal BlockType =
    | Tuple
 
 /// Make a position at (line, col) to denote cursor position
-let makePos line col = mkPos line col
+let makePos line col = mkPos line col
+
+let readConfiguration fileOrFolder =
+    try
+        let configurationFiles =
+            ConfigFile.findConfigurationFiles fileOrFolder
+
+        if List.isEmpty configurationFiles then failwithf "No configuration files were found for %s" fileOrFolder
+
+        let (config,warnings) =
+            List.fold (fun (currentConfig, warnings) configPath ->
+                let configContent = System.IO.File.ReadAllText(configPath)
+                let options, warningFromConfigPath =
+                    match System.IO.Path.GetFileName(configPath) with
+                    | json when (json = ConfigFile.jsonConfigFileName) ->
+                        JsonConfig.parseOptionsFromJson configContent
+                    | editorconfig when (editorconfig = ConfigFile.editorConfigFileName) ->
+                        EditorConfig.parseOptionsFromEditorConfig configContent
+                    | _ ->
+                        failwithf "Filename is not supported!"
+                let updatedConfig = FormatConfig.applyOptions(currentConfig, options)
+                let locationAwareWarnings =
+                    List.ofArray warningFromConfigPath
+                    |> List.map (ConfigFile.makeWarningLocationAware configPath)
+
+                (updatedConfig, warnings @ locationAwareWarnings)
+            ) (FormatConfig.Default, []) configurationFiles
+
+        match warnings with
+        | [] -> FormatConfigFileParseResult.Success config
+        | w -> FormatConfigFileParseResult.PartialSuccess (config, w)
+    with
+    | exn -> FormatConfigFileParseResult.Failure exn

src/Fantomas/ConfigFile.fs

@@ -0,0 +1,62 @@
+module internal Fantomas.ConfigFile
+
+open System.IO
+open Fantomas.FormatConfig
+open Fantomas.Version
+
+let jsonConfigFileName = "fantomas-config.json"
+let editorConfigFileName = ".editor-config"
+
+let private allowedFileNames = [jsonConfigFileName; editorConfigFileName]
+
+let rec private getParentFolders acc current =
+    let parent = Directory.GetParent(current) |> Option.ofObj
+    match parent with
+    | Some p -> getParentFolders (current::acc) p.FullName
+    | None -> current::acc
+
+/// Returns all the found configuration files for the given path
+/// fileOrFolder can be a concrete json file or a directory path
+let rec findConfigurationFiles fileOrFolder : string list =
+    let findConfigInFolder folderPath =
+        allowedFileNames
+        |> List.map (fun fn -> Path.Combine(folderPath, fn))
+        |> List.filter (File.Exists)
+
+    if Path.GetExtension(fileOrFolder) = "" && Directory.Exists fileOrFolder then
+        getParentFolders [] fileOrFolder
+        |> List.collect findConfigInFolder
+    elif File.Exists(fileOrFolder) then
+        let parentFolder =
+            Directory.GetParent(Path.GetDirectoryName(fileOrFolder))
+            |> Option.ofObj
+        match parentFolder with
+        | Some pf -> findConfigurationFiles pf.FullName @ [fileOrFolder]
+        | None -> [fileOrFolder]
+    else
+        []
+
+let makeWarningLocationAware configPath warning =
+    sprintf "%s, in %s" warning configPath
+
+let private fantomasFields = Reflection.getRecordFields FormatConfig.Default |> Array.map fst
+let private (|FantomasSetting|_|) (s:string) =
+    let s = s.Trim('\"')
+    Array.tryFind ((=) s) fantomasFields
+
+let private (|Number|_|) d =
+    match System.Int32.TryParse(d) with
+    | true, d -> Some (box d)
+    | _ -> None
+let private (|Boolean|_|) b =
+    if b = "true" then Some (box true)
+    elif b = "false" then Some (box false)
+    else None
+
+let processSetting originalLine key value =
+    match (key, value) with
+    | (FantomasSetting(fs), Number(v))
+    | (FantomasSetting(fs), Boolean(v)) -> Ok (fs, v)
+    | _ ->
+        let warning = sprintf "%s is no valid setting for Fantomas v%s" originalLine (fantomasVersion.Value)
+        Error warning

src/Fantomas/EditorConfig.fs

@@ -0,0 +1,7 @@
+module internal Fantomas.EditorConfig
+
+/// Similar to how to processing of the JSON file happens, this function should the options found in the editor config.
+/// The first argument in the return tuple are the options. Listed as (key,value) where key is a member name of the FormatConfig record. Value is either a boolean or an int boxed as object.
+/// The second argument in the return tuple are warnings. F.ex. invalid settings
+let parseOptionsFromEditorConfig editorConfig : (string * obj) array * string array =
+    Array.empty, Array.empty

src/Fantomas/Fantomas.fsproj

@@ -16,6 +16,9 @@
     <Compile Include="Dbg.fs" />
     <Compile Include="Utils.fs" />
     <Compile Include="FormatConfig.fs" />
+    <Compile Include="ConfigFile.fs" />
+    <Compile Include="JsonConfig.fs" />
+    <Compile Include="EditorConfig.fs" />
     <Compile Include="TriviaTypes.fs" />
     <Compile Include="TokenParserBoolExpr.fs" />
     <Compile Include="TriviaHelpers.fs" />