New typePrefixing modes "Always" and "Never" (default: "Hybrid")

FSharpLint.sln

@@ -24,6 +24,94 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		build.fsx = build.fsx
 	EndProjectSection
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "docs", "docs", "{E1E03FFE-30DF-4522-83DA-9089147B431E}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "rules", "rules", "{AEBB56D7-30B4-40D7-B065-54B8BE960298}"
+	ProjectSection(SolutionItems) = preProject
+		docs\content\how-tos\rules\FL0001.md = docs\content\how-tos\rules\FL0001.md
+		docs\content\how-tos\rules\FL0002.md = docs\content\how-tos\rules\FL0002.md
+		docs\content\how-tos\rules\FL0003.md = docs\content\how-tos\rules\FL0003.md
+		docs\content\how-tos\rules\FL0004.md = docs\content\how-tos\rules\FL0004.md
+		docs\content\how-tos\rules\FL0005.md = docs\content\how-tos\rules\FL0005.md
+		docs\content\how-tos\rules\FL0006.md = docs\content\how-tos\rules\FL0006.md
+		docs\content\how-tos\rules\FL0007.md = docs\content\how-tos\rules\FL0007.md
+		docs\content\how-tos\rules\FL0008.md = docs\content\how-tos\rules\FL0008.md
+		docs\content\how-tos\rules\FL0009.md = docs\content\how-tos\rules\FL0009.md
+		docs\content\how-tos\rules\FL0010.md = docs\content\how-tos\rules\FL0010.md
+		docs\content\how-tos\rules\FL0011.md = docs\content\how-tos\rules\FL0011.md
+		docs\content\how-tos\rules\FL0012.md = docs\content\how-tos\rules\FL0012.md
+		docs\content\how-tos\rules\FL0013.md = docs\content\how-tos\rules\FL0013.md
+		docs\content\how-tos\rules\FL0014.md = docs\content\how-tos\rules\FL0014.md
+		docs\content\how-tos\rules\FL0015.md = docs\content\how-tos\rules\FL0015.md
+		docs\content\how-tos\rules\FL0016.md = docs\content\how-tos\rules\FL0016.md
+		docs\content\how-tos\rules\FL0017.md = docs\content\how-tos\rules\FL0017.md
+		docs\content\how-tos\rules\FL0018.md = docs\content\how-tos\rules\FL0018.md
+		docs\content\how-tos\rules\FL0019.md = docs\content\how-tos\rules\FL0019.md
+		docs\content\how-tos\rules\FL0020.md = docs\content\how-tos\rules\FL0020.md
+		docs\content\how-tos\rules\FL0021.md = docs\content\how-tos\rules\FL0021.md
+		docs\content\how-tos\rules\FL0022.md = docs\content\how-tos\rules\FL0022.md
+		docs\content\how-tos\rules\FL0023.md = docs\content\how-tos\rules\FL0023.md
+		docs\content\how-tos\rules\FL0024.md = docs\content\how-tos\rules\FL0024.md
+		docs\content\how-tos\rules\FL0025.md = docs\content\how-tos\rules\FL0025.md
+		docs\content\how-tos\rules\FL0026.md = docs\content\how-tos\rules\FL0026.md
+		docs\content\how-tos\rules\FL0027.md = docs\content\how-tos\rules\FL0027.md
+		docs\content\how-tos\rules\FL0028.md = docs\content\how-tos\rules\FL0028.md
+		docs\content\how-tos\rules\FL0029.md = docs\content\how-tos\rules\FL0029.md
+		docs\content\how-tos\rules\FL0030.md = docs\content\how-tos\rules\FL0030.md
+		docs\content\how-tos\rules\FL0031.md = docs\content\how-tos\rules\FL0031.md
+		docs\content\how-tos\rules\FL0032.md = docs\content\how-tos\rules\FL0032.md
+		docs\content\how-tos\rules\FL0033.md = docs\content\how-tos\rules\FL0033.md
+		docs\content\how-tos\rules\FL0034.md = docs\content\how-tos\rules\FL0034.md
+		docs\content\how-tos\rules\FL0035.md = docs\content\how-tos\rules\FL0035.md
+		docs\content\how-tos\rules\FL0036.md = docs\content\how-tos\rules\FL0036.md
+		docs\content\how-tos\rules\FL0037.md = docs\content\how-tos\rules\FL0037.md
+		docs\content\how-tos\rules\FL0038.md = docs\content\how-tos\rules\FL0038.md
+		docs\content\how-tos\rules\FL0039.md = docs\content\how-tos\rules\FL0039.md
+		docs\content\how-tos\rules\FL0040.md = docs\content\how-tos\rules\FL0040.md
+		docs\content\how-tos\rules\FL0041.md = docs\content\how-tos\rules\FL0041.md
+		docs\content\how-tos\rules\FL0042.md = docs\content\how-tos\rules\FL0042.md
+		docs\content\how-tos\rules\FL0043.md = docs\content\how-tos\rules\FL0043.md
+		docs\content\how-tos\rules\FL0044.md = docs\content\how-tos\rules\FL0044.md
+		docs\content\how-tos\rules\FL0045.md = docs\content\how-tos\rules\FL0045.md
+		docs\content\how-tos\rules\FL0046.md = docs\content\how-tos\rules\FL0046.md
+		docs\content\how-tos\rules\FL0047.md = docs\content\how-tos\rules\FL0047.md
+		docs\content\how-tos\rules\FL0048.md = docs\content\how-tos\rules\FL0048.md
+		docs\content\how-tos\rules\FL0049.md = docs\content\how-tos\rules\FL0049.md
+		docs\content\how-tos\rules\FL0050.md = docs\content\how-tos\rules\FL0050.md
+		docs\content\how-tos\rules\FL0051.md = docs\content\how-tos\rules\FL0051.md
+		docs\content\how-tos\rules\FL0052.md = docs\content\how-tos\rules\FL0052.md
+		docs\content\how-tos\rules\FL0053.md = docs\content\how-tos\rules\FL0053.md
+		docs\content\how-tos\rules\FL0054.md = docs\content\how-tos\rules\FL0054.md
+		docs\content\how-tos\rules\FL0055.md = docs\content\how-tos\rules\FL0055.md
+		docs\content\how-tos\rules\FL0056.md = docs\content\how-tos\rules\FL0056.md
+		docs\content\how-tos\rules\FL0057.md = docs\content\how-tos\rules\FL0057.md
+		docs\content\how-tos\rules\FL0058.md = docs\content\how-tos\rules\FL0058.md
+		docs\content\how-tos\rules\FL0059.md = docs\content\how-tos\rules\FL0059.md
+		docs\content\how-tos\rules\FL0060.md = docs\content\how-tos\rules\FL0060.md
+		docs\content\how-tos\rules\FL0061.md = docs\content\how-tos\rules\FL0061.md
+		docs\content\how-tos\rules\FL0062.md = docs\content\how-tos\rules\FL0062.md
+		docs\content\how-tos\rules\FL0063.md = docs\content\how-tos\rules\FL0063.md
+		docs\content\how-tos\rules\FL0064.md = docs\content\how-tos\rules\FL0064.md
+		docs\content\how-tos\rules\FL0065.md = docs\content\how-tos\rules\FL0065.md
+		docs\content\how-tos\rules\FL0066.md = docs\content\how-tos\rules\FL0066.md
+		docs\content\how-tos\rules\FL0067.md = docs\content\how-tos\rules\FL0067.md
+		docs\content\how-tos\rules\FL0068.md = docs\content\how-tos\rules\FL0068.md
+		docs\content\how-tos\rules\FL0069.md = docs\content\how-tos\rules\FL0069.md
+		docs\content\how-tos\rules\FL0070.md = docs\content\how-tos\rules\FL0070.md
+		docs\content\how-tos\rules\FL0071.md = docs\content\how-tos\rules\FL0071.md
+		docs\content\how-tos\rules\FL0072.md = docs\content\how-tos\rules\FL0072.md
+		docs\content\how-tos\rules\FL0073.md = docs\content\how-tos\rules\FL0073.md
+		docs\content\how-tos\rules\FL0074.md = docs\content\how-tos\rules\FL0074.md
+		docs\content\how-tos\rules\FL0075.md = docs\content\how-tos\rules\FL0075.md
+		docs\content\how-tos\rules\FL0076.md = docs\content\how-tos\rules\FL0076.md
+		docs\content\how-tos\rules\FL0077.md = docs\content\how-tos\rules\FL0077.md
+		docs\content\how-tos\rules\FL0078.md = docs\content\how-tos\rules\FL0078.md
+		docs\content\how-tos\rules\FL0079.md = docs\content\how-tos\rules\FL0079.md
+		docs\content\how-tos\rules\FL0080.md = docs\content\how-tos\rules\FL0080.md
+		docs\content\how-tos\rules\FL0081.md = docs\content\how-tos\rules\FL0081.md
+		docs\content\how-tos\rules\FL0082.md = docs\content\how-tos\rules\FL0082.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -117,6 +205,8 @@ Global
 		{0DE70980-49E9-4613-84D4-FCF6ACABA5EE} = {1CD44876-BCDC-4C93-9DC2-C45244BD62AE}
 		{73AD322D-2E3F-45C4-8DB2-179571DECCD0} = {1CD44876-BCDC-4C93-9DC2-C45244BD62AE}
 		{B4A92AC6-F74A-4709-B2F7-6C5BABBFDEB0} = {1CD44876-BCDC-4C93-9DC2-C45244BD62AE}
+		{E1E03FFE-30DF-4522-83DA-9089147B431E} = {270E691D-ECA1-4BC5-B851-C5431A64E9FA}
+		{AEBB56D7-30B4-40D7-B065-54B8BE960298} = {E1E03FFE-30DF-4522-83DA-9089147B431E}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {B54B4B7D-F019-48A3-BB5B-635B68FE41C3}

docs/content/how-tos/rules/FL0010.md

@@ -29,4 +29,4 @@ Update typed item to use configured spacing.
         }
     }
 
-* *typedItemSpacing* - style of spacing: "NoSpaces", "SpaceAfter", "SpacesAround"
+* *typedItemStyle* - style of spacing: "NoSpaces", "SpaceAfter", "SpacesAround"

docs/content/how-tos/rules/FL0011.md

@@ -22,6 +22,11 @@ Update higher order type to have correct formatting as per guide linked above.
 
     {
         "typePrefixing": {
-            "enabled": false
+            "enabled": false,
+            "config": {
+                "mode": "Hybrid"
+            }
         }
     }
+
+* *mode* - how to enforce the rule ("Hybrid" or "Always" or "Never")

src/FSharpLint.Core/Application/Configuration.fs

@@ -137,6 +137,13 @@ let constructRuleWithConfig rule ruleConfig =
     else
         None
 
+let constructTypePrefixingRuleWithConfig rule (ruleConfig: RuleConfig<TypePrefixing.Config>) =
+    if ruleConfig.Enabled then
+        let config = ruleConfig.Config |> Option.defaultValue { Mode = TypePrefixing.Mode.Hybrid }
+        Some(rule config)
+    else
+        None
+
 type TupleFormattingConfig =
     { tupleCommaSpacing:EnabledConfig option
       tupleIndentation:EnabledConfig option
@@ -165,7 +172,7 @@ with
 
 type FormattingConfig =
     { typedItemSpacing:RuleConfig<TypedItemSpacing.Config> option
-      typePrefixing:EnabledConfig option
+      typePrefixing:RuleConfig<TypePrefixing.Config> option
       unionDefinitionIndentation:EnabledConfig option
       moduleDeclSpacing:EnabledConfig option
       classMemberSpacing:EnabledConfig option
@@ -175,7 +182,7 @@ with
     member this.Flatten() =
         [|
             this.typedItemSpacing |> Option.bind (constructRuleWithConfig TypedItemSpacing.rule) |> Option.toArray
-            this.typePrefixing |> Option.bind (constructRuleIfEnabled TypePrefixing.rule) |> Option.toArray
+            this.typePrefixing |> Option.bind (constructTypePrefixingRuleWithConfig TypePrefixing.rule) |> Option.toArray
             this.unionDefinitionIndentation |> Option.bind (constructRuleIfEnabled UnionDefinitionIndentation.rule) |> Option.toArray
             this.moduleDeclSpacing |> Option.bind (constructRuleIfEnabled ModuleDeclSpacing.rule) |> Option.toArray
             this.classMemberSpacing |> Option.bind (constructRuleIfEnabled ClassMemberSpacing.rule) |> Option.toArray
@@ -389,7 +396,7 @@ type Configuration =
       ignoreFiles:string [] option
       Hints:HintConfig option
       TypedItemSpacing:RuleConfig<TypedItemSpacing.Config> option
-      TypePrefixing:EnabledConfig option
+      TypePrefixing:RuleConfig<TypePrefixing.Config> option
       UnionDefinitionIndentation:EnabledConfig option
       ModuleDeclSpacing:EnabledConfig option
       ClassMemberSpacing:EnabledConfig option
@@ -628,7 +635,7 @@ let flattenConfig (config:Configuration) =
     let allRules =
         [|
             config.TypedItemSpacing |> Option.bind (constructRuleWithConfig TypedItemSpacing.rule)
-            config.TypePrefixing |> Option.bind (constructRuleIfEnabled TypePrefixing.rule)
+            config.TypePrefixing |> Option.bind (constructTypePrefixingRuleWithConfig TypePrefixing.rule)
             config.UnionDefinitionIndentation |> Option.bind (constructRuleIfEnabled UnionDefinitionIndentation.rule)
             config.ModuleDeclSpacing |> Option.bind (constructRuleIfEnabled ModuleDeclSpacing.rule)
             config.ClassMemberSpacing |> Option.bind (constructRuleIfEnabled ClassMemberSpacing.rule)

src/FSharpLint.Core/Rules/Formatting/TypePrefixing.fs

@@ -8,30 +8,52 @@ open FSharpLint.Framework.Ast
 open FSharpLint.Framework.Rules
 open FSharpLint.Framework.ExpressionUtilities
 
-let checkTypePrefixing (args:AstNodeRuleParams) range typeName typeArgs isPostfix =
+type Mode =
+    | Hybrid = 0
+    | Always = 1
+    | Never = 2
+
+[<RequireQualifiedAccess>]
+type Config = { Mode: Mode }
+
+let checkTypePrefixing (config:Config) (args:AstNodeRuleParams) range typeName typeArgs isPostfix =
+    let recommendPostfixErrMsg = lazy(Resources.GetString("RulesFormattingF#PostfixGenericError"))
     match typeName with
     | SynType.LongIdent lid ->
+        let prefixSuggestion typeName =
+            let suggestedFix = lazy(
+                (ExpressionUtilities.tryFindTextOfRange range args.FileContent, typeArgs)
+                ||> Option.map2 (fun fromText typeArgs -> { FromText = fromText; FromRange = range; ToText = typeName + "<" + typeArgs + ">" }))
+            { Range = range
+              Message = Resources.GetString("RulesFormattingGenericPrefixError")
+              SuggestedFix = Some suggestedFix
+              TypeChecks = [] } |> Some
+
         match lid |> longIdentWithDotsToString with
         | "list"
         | "List"
         | "option"
         | "Option"
         | "ref"
         | "Ref" as typeName ->
+
             // Prefer postfix.
-            if not isPostfix
+            if not isPostfix && config.Mode <> Mode.Always
             then
-                let errorFormatString = Resources.GetString("RulesFormattingF#PostfixGenericError")
                 let suggestedFix = lazy(
                     (ExpressionUtilities.tryFindTextOfRange range args.FileContent, typeArgs)
                     ||> Option.map2 (fun fromText typeArgs -> { FromText = fromText; FromRange = range; ToText = typeArgs + " " + typeName }))
                 { Range = range
-                  Message =  String.Format(errorFormatString, typeName)
+                  Message =  String.Format(recommendPostfixErrMsg.Value, typeName)
                   SuggestedFix = Some suggestedFix
                   TypeChecks = [] } |> Some
             else
-                None
-        | "array" ->
+                if isPostfix && config.Mode = Mode.Always then
+                    prefixSuggestion typeName
+                else
+                    None
+
+        | "array" when config.Mode <> Mode.Always ->
             // Prefer special postfix (e.g. int []).
             let suggestedFix = lazy(
                 (ExpressionUtilities.tryFindTextOfRange range args.FileContent, typeArgs)
@@ -40,33 +62,42 @@ let checkTypePrefixing (args:AstNodeRuleParams) range typeName typeArgs isPostfi
               Message = Resources.GetString("RulesFormattingF#ArrayPostfixError")
               SuggestedFix = Some suggestedFix
               TypeChecks = [] } |> Some
+
         | typeName ->
-            // Prefer prefix.
-            if isPostfix then
-                let suggestedFix = lazy(
-                    (ExpressionUtilities.tryFindTextOfRange range args.FileContent, typeArgs)
-                    ||> Option.map2 (fun fromText typeArgs -> { FromText = fromText; FromRange = range; ToText = typeName + "<" + typeArgs + ">" }))
+            match (isPostfix, config.Mode) with
+            | true, Mode.Never ->
+                None
+            | true, _ ->
+                prefixSuggestion typeName
+            | false, Mode.Never ->
                 { Range = range
-                  Message = Resources.GetString("RulesFormattingGenericPrefixError")
-                  SuggestedFix = Some suggestedFix
-                  TypeChecks = [] } |> Some
-            else
+                  Message =  String.Format(recommendPostfixErrMsg.Value, typeName)
+                  // TODO
+                  SuggestedFix = None
+                  TypeChecks = List.Empty } |> Some
+            | false, _ ->
                 None
     | _ ->
         None
 
-let runner args =
+let runner (config:Config) args =
     match args.AstNode with
     | AstNode.Type (SynType.App (typeName, _, typeArgs, _, _, isPostfix, range)) ->
         let typeArgs = typeArgsToString args.FileContent typeArgs
-        checkTypePrefixing args range typeName typeArgs isPostfix
+        checkTypePrefixing config args range typeName typeArgs isPostfix
         |> Option.toArray
+    | AstNode.Type (SynType.Array (1, _elementType, range)) when config.Mode = Mode.Always ->
+        { Range = range
+          Message = Resources.GetString("RulesFormattingF#ArrayPrefixError")
+          SuggestedFix = None
+          TypeChecks = List.Empty } 
+        |> Array.singleton
     | _ ->
         Array.empty
 
 
-let rule =
+let rule config =
     { Name = "TypePrefixing"
       Identifier = Identifiers.TypePrefixing
-      RuleConfig = { AstNodeRuleConfig.Runner = runner; Cleanup = ignore } }
+      RuleConfig = { AstNodeRuleConfig.Runner = runner config; Cleanup = ignore } }
     |> AstNodeRule

src/FSharpLint.Core/Text.resx

@@ -273,6 +273,9 @@
   <data name="RulesFormattingF#PostfixGenericError" xml:space="preserve">
     <value>Use postfix syntax for F# type {0}.</value>
   </data>
+  <data name="RulesFormattingF#ArrayPrefixError" xml:space="preserve">
+    <value>Use prefix syntax for generic type (array&lt;'Foo&gt;).</value>
+  </data>
   <data name="RulesFormattingGenericPrefixError" xml:space="preserve">
     <value>Use prefix syntax for generic type.</value>
   </data>

src/FSharpLint.Core/fsharplint.json

@@ -11,7 +11,12 @@
             "typedItemStyle": "NoSpaces"
         }
     },
-    "typePrefixing": { "enabled": false },
+    "typePrefixing": {
+        "enabled": false,
+        "config": {
+            "mode": "Hybrid"
+        }
+    },
     "unionDefinitionIndentation": { "enabled": false },
     "moduleDeclSpacing": { "enabled": false },
     "classMemberSpacing": { "enabled": false },
@@ -144,7 +149,7 @@
     },
     "recordFieldNames": {
         "enabled": true,
-        "config":  {
+        "config": {
             "naming": "PascalCase",
             "underscores": "None"
         }

tests/FSharpLint.Console.Tests/TestApp.fs

@@ -10,10 +10,10 @@ let getErrorsFromOutput (output:string) =
     set [ for i in 1..splitOutput.Length - 1 do
             if splitOutput.[i].StartsWith "Error" then yield splitOutput.[i - 1] ]
 
-type TemporaryFile(config, extension) =
+type TemporaryFile(fileContent, extension) =
     let filename = Path.ChangeExtension(Path.GetTempFileName(), extension)
     do
-        File.WriteAllText(filename, config)
+        File.WriteAllText(filename, fileContent)
 
     member __.FileName = filename
 
@@ -35,12 +35,12 @@ let main input =
 type TestConsoleApplication() =
     [<Test>]
     member __.``Lint file, expected rules are triggered.``() =
-        let config = """
+        let fileContent = """
         type Signature =
             abstract member Encoded : string
             abstract member PathName : string
         """
-        use input = new TemporaryFile(config, "fs")
+        use input = new TemporaryFile(fileContent, "fs")
 
         let (returnCode, errors) = main [| "lint"; input.FileName |]
 
@@ -62,14 +62,14 @@ type TestConsoleApplication() =
 
     [<Test>]
     member __.``Lint source with valid config to disable rule, disabled rule is not triggered for given source.``() =
-        let config = """
+        let fileContent = """
         {
             "InterfaceNames": {
                 "enabled": false
             }
         }
         """
-        use config = new TemporaryFile(config, "json")
+        use config = new TemporaryFile(fileContent, "json")
 
         let input = """
         type Signature =
@@ -95,3 +95,25 @@ type TestConsoleApplication() =
 
         Assert.AreEqual(0, returnCode)
         Assert.AreEqual(Set.empty, errors)
+
+    [<Test>]
+    member __.``Regression test: typePrefixing rule with old config format should still work``() =
+        let fileContent = """
+        {
+            "typePrefixing": {
+                "enabled": true
+            }
+        }
+        """
+        use config = new TemporaryFile(fileContent, "json")
+
+        let input = """
+        module Program
+
+        type X = int Generic
+        """
+
+        let (returnCode, errors) = main [| "lint"; "--lint-config"; config.FileName; input |]
+
+        Assert.AreEqual(-1, returnCode)
+        Assert.AreEqual(set ["Use prefix syntax for generic type."], errors)