fix issues with duplicated editorconfig sections, handle failures parsing editorconfigs (#993)

closes #989

Author: belav

Src/CSharpier.Cli/EditorConfig/ConfigFileParser.cs

@@ -13,7 +13,13 @@ internal static class ConfigFileParser
     private static readonly Regex CommentRegex = new("^[;#].*$");
 
     private static readonly IniParserConfiguration Configuration =
-        new() { CommentRegex = CommentRegex, AllowDuplicateKeys = true };
+        new()
+        {
+            CommentRegex = CommentRegex,
+            AllowDuplicateKeys = true,
+            AllowDuplicateSections = true,
+            OverrideDuplicateKeys = true
+        };
 
     public static ConfigFile Parse(string filePath, IFileSystem fileSystem)
     {

Src/CSharpier.Cli/Options/OptionsProvider.cs

@@ -3,19 +3,20 @@ namespace CSharpier.Cli.Options;
 using System.IO.Abstractions;
 using System.Text.Json;
 using CSharpier.Cli.EditorConfig;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.Extensions.Logging;
 using PrinterOptions = CSharpier.PrinterOptions;
 
 internal class OptionsProvider
 {
-    private readonly List<EditorConfigSections> editorConfigs;
+    private readonly IList<EditorConfigSections> editorConfigs;
     private readonly List<CSharpierConfigData> csharpierConfigs;
     private readonly IgnoreFile ignoreFile;
     private readonly PrinterOptions? specifiedPrinterOptions;
     private readonly IFileSystem fileSystem;
 
     private OptionsProvider(
-        List<EditorConfigSections> editorConfigs,
+        IList<EditorConfigSections> editorConfigs,
         List<CSharpierConfigData> csharpierConfigs,
         IgnoreFile ignoreFile,
         PrinterOptions? specifiedPrinterOptions,
@@ -45,14 +46,24 @@ CancellationToken cancellationToken
             ? ConfigurationFileOptions.FindForDirectoryName(directoryName, fileSystem, logger)
             : Array.Empty<CSharpierConfigData>().ToList();
 
-        var editorConfigSections = EditorConfigParser.FindForDirectoryName(
-            directoryName,
-            fileSystem
-        );
+        IList<EditorConfigSections>? editorConfigSections = null;
+
+        try
+        {
+            editorConfigSections = EditorConfigParser.FindForDirectoryName(
+                directoryName,
+                fileSystem
+            );
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, $"Failure parsing editorconfig files for {directoryName}");
+        }
+
         var ignoreFile = await IgnoreFile.Create(directoryName, fileSystem, cancellationToken);
 
         return new OptionsProvider(
-            editorConfigSections,
+            editorConfigSections ?? Array.Empty<EditorConfigSections>(),
             csharpierConfigs,
             ignoreFile,
             specifiedPrinterOptions,

Src/CSharpier.Tests/OptionsProviderTests.cs

@@ -244,6 +244,61 @@ public async Task Should_Support_EditorConfig_With_Comments()
         result.EndOfLine.Should().Be(EndOfLine.CRLF);
     }
 
+    [Test]
+    public async Task Should_Support_EditorConfig_With_Duplicated_Sections()
+    {
+        var context = new TestContext();
+        context.WhenAFileExists(
+            "c:/test/.editorconfig",
+            @"
+[*]
+indent_size = 2
+
+[*]
+indent_size = 4
+"
+        );
+
+        var result = await context.CreateProviderAndGetOptionsFor("c:/test", "c:/test/test.cs");
+
+        result.TabWidth.Should().Be(4);
+    }
+
+    [Test]
+    public async Task Should_Support_EditorConfig_With_Duplicated_Rules()
+    {
+        var context = new TestContext();
+        context.WhenAFileExists(
+            "c:/test/.editorconfig",
+            @"
+[*]
+indent_size = 2
+indent_size = 4
+"
+        );
+
+        var result = await context.CreateProviderAndGetOptionsFor("c:/test", "c:/test/test.cs");
+
+        result.TabWidth.Should().Be(4);
+    }
+
+    [Test]
+    public async Task Should_Not_Fail_With_Bad_EditorConfig()
+    {
+        var context = new TestContext();
+        context.WhenAFileExists(
+            "c:/test/.editorconfig",
+            @"
+[*
+indent_size==
+"
+        );
+
+        var result = await context.CreateProviderAndGetOptionsFor("c:/test", "c:/test/test.cs");
+
+        result.TabWidth.Should().Be(4);
+    }
+
     [TestCase("tab_width")]
     [TestCase("indent_size")]
     public async Task Should_Support_EditorConfig_Tabs(string propertyName)