Add OutputType.Minimal (#185)

readme.md

@@ -20,7 +20,7 @@ https://nuget.org/packages/Verify.DiffPlex/
 
 ### Initialize
 
-Call `VerifyDiffPlex.Initialize()` in a `[ModuleInitializer]`. Alternatively, use `VerifyDiffPlex.Initialize(OutputType.Full)` or `VerifyDiffPlex.Initialize(OutputType.Compact)` to specify the type of output (see below).
+Call `VerifyDiffPlex.Initialize()` in a `[ModuleInitializer]`. Alternatively, use `VerifyDiffPlex.Initialize(OutputType.Full)`, `VerifyDiffPlex.Initialize(OutputType.Compact)` or `VerifyDiffPlex.Initialize(OutputType.Minimal)` to specify the type of output (see below).
 
 <!-- snippet: ModuleInitializer.cs -->
 <a id='snippet-ModuleInitializer.cs'></a>
@@ -89,7 +89,7 @@ Compare Result:
 
 ### Output types
 
-The library currently supports two different types of diff outputs; the desired type can be specified during library initialization.
+The library currently supports three different types of diff outputs; the desired type can be specified during library initialization.
 
 <!-- snippet: OutputTypeCompact -->
 <a id='snippet-outputtypecompact'></a>
@@ -116,7 +116,7 @@ public static void Init() =>
   Eighth line
 ```
 
-This output type gives the most information, but if verified files are long, it can be difficult to read through and find the actual differences. `OutputType.Compact` will show only the changed lines, with one line of context (with line number) before and after each changed section to help identify where the change is. The `Full` output above would look like this as `Compact`.
+This output type gives the most information, but if verified files are long, it can be difficult to read through and find the actual differences. `OutputType.Compact` will show only the changed lines, with one line of context (with line number) before and after each changed section to help identify where the change is.
 
 ```
 1 First line
@@ -130,6 +130,15 @@ This output type gives the most information, but if verified files are long, it
 7 Seventh line
 ```
 
+Lastly, there is `OutputType.Minimal` which will show only the changed lines.
+
+```
+- Second line
++ Second line changed
+- Sixth line
++ Sixth line changed
+```
+
 
 ### Test level settings
 
@@ -147,7 +156,7 @@ public Task TestLevelUsage()
     return Verify(target, settings);
 }
 ```
-<sup><a href='/src/Tests/Tests.cs#L93-L104' title='Snippet source file'>snippet source</a> | <a href='#snippet-testlevelusage' title='Start of snippet'>anchor</a></sup>
+<sup><a href='/src/Tests/Tests.cs#L111-L122' title='Snippet source file'>snippet source</a> | <a href='#snippet-testlevelusage' title='Start of snippet'>anchor</a></sup>
 <!-- endSnippet -->
 
 Or Fluently
@@ -163,5 +172,5 @@ public Task TestLevelUsageFluent()
         .UseDiffPlex();
 }
 ```
-<sup><a href='/src/Tests/Tests.cs#L106-L116' title='Snippet source file'>snippet source</a> | <a href='#snippet-testlevelusagefluent' title='Start of snippet'>anchor</a></sup>
+<sup><a href='/src/Tests/Tests.cs#L124-L134' title='Snippet source file'>snippet source</a> | <a href='#snippet-testlevelusagefluent' title='Start of snippet'>anchor</a></sup>
 <!-- endSnippet -->

src/Tests/Tests.AtTestLevelMinimal.verified.txt

@@ -0,0 +1,20 @@
+{
+  Type: VerifyException,
+  Message:
+Directory: {ProjectDirectory}
+NotEqual:
+  - Received: Tests.AtTestLevelMinimalFake.received.txt
+    Verified: Tests.AtTestLevelMinimalFake.verified.txt
+
+FileContent:
+
+NotEqual:
+
+Received: Tests.AtTestLevelMinimalFake.received.txt
+Verified: Tests.AtTestLevelMinimalFake.verified.txt
+Compare Result:
+- before
++ after
+
+
+}

src/Tests/Tests.AtTestLevelMinimalFake.verified.txt

@@ -0,0 +1,3 @@
+The
+before
+text

src/Tests/Tests.cs

@@ -79,6 +79,24 @@ public Task AtTestLevelCompact()
                 settings));
     }
 
+    [Test]
+    public Task AtTestLevelMinimal()
+    {
+        var settings = new VerifySettings();
+        settings.UseMethodName("AtTestLevelMinimalFake");
+        settings.DisableDiff();
+        settings.UseDiffPlex(OutputType.Minimal);
+
+        return ThrowsTask(() =>
+            Verify(
+                """
+                The
+                after
+                text
+                """,
+                settings));
+    }
+
     [Test]
     public Task Sample()
     {

src/Verify.DiffPlex/OutputType.cs

@@ -1,3 +1,3 @@
 namespace VerifyTests.DiffPlex;
 
-public enum OutputType { Full, Compact }
+public enum OutputType { Full, Compact, Minimal }

src/Verify.DiffPlex/VerifyDiffPlex.cs

@@ -10,6 +10,7 @@ public static class VerifyDiffPlex
         outputType switch
         {
             OutputType.Compact => CompactCompare,
+            OutputType.Minimal => MinimalCompare,
             _ => VerboseCompare
         };
 
@@ -69,6 +70,32 @@ static StringBuilder VerboseCompare(string received, string verified)
         return builder;
     }
 
+    static StringBuilder MinimalCompare(string received, string verified)
+    {
+        var diff = InlineDiffBuilder.Diff(verified, received);
+
+        var builder = new StringBuilder();
+        foreach (var line in diff.Lines)
+        {
+            switch (line.Type)
+            {
+                case ChangeType.Inserted:
+                    builder.Append("+ ");
+                    break;
+                case ChangeType.Deleted:
+                    builder.Append("- ");
+                    break;
+                default:
+                    // omit unchanged files
+                    continue;
+            }
+
+            builder.AppendLine(line.Text);
+        }
+
+        return builder;
+    }
+
     static StringBuilder CompactCompare(string received, string verified)
     {
         var diff = InlineDiffBuilder.Diff(verified, received);