Add csharpier support

CHANGELOG.md

@@ -24,6 +24,10 @@ The format is based on [Keep a Changelog].
   [`gleam`](https://github.com/gleam-lang/gleam) ([#325])
 * `zig fmt` official formatter for 
   [zig](https://ziglang.org/) ([#327]).
+* `csharpier` for
+  [C#](https://learn.microsoft.com/en-us/dotnet/csharp/) ([#328]).
+* `clang-format` for
+  [C#](https://learn.microsoft.com/en-us/dotnet/csharp/) ([#328]).
 
 ### Bugs fixed
 * `apheleia-npx` would use an incorrect path for the Yarn PnP ESM

apheleia-formatters.el

@@ -44,6 +44,7 @@
     (cljfmt . ("cljfmt" "fix" "-"))
     (cmake-format . ("cmake-format" "-"))
     (crystal-tool-format . ("crystal" "tool" "format" "-"))
+    (csharpier . ("dotnet-csharpier" "--write-stdout"))
     (css-beautify "css-beautify" "--file" "-" "--end-with-newline"
                   (apheleia-formatters-indent
                    "--indent-with-tabs" "--indent-size"))
@@ -313,6 +314,8 @@ rather than using this system."
     (conf-toml-mode . dprint)
     (cperl-mode . perltidy)
     (crystal-mode . crystal-tool-format)
+    (csharp-mode . clang-format)
+    (csharp-ts-mode . clang-format)
     (css-mode . prettier-css)
     (css-ts-mode . prettier-css)
     (dart-mode . dart-format)

test/formatters/installers/csharpier.bash

@@ -0,0 +1,8 @@
+apt-get install -y dotnet-sdk-8.0
+
+dotnet tool install csharpier -g
+
+if ! [[ "$PATH" =~ $HOME/.dotnet/tools:$HOME/bin: ]]; then
+    PATH="$HOME/.dotnet/tools:$HOME/bin:$PATH"
+fi
+export PATH

test/formatters/samplecode/csharpier/in.cs

@@ -0,0 +1,5 @@
+public class ClassName {
+    public void CallMethod() {
+        this.LongUglyMethod("1234567890", "abcdefghijklmnopqrstuvwxyz", "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+    }
+}

test/formatters/samplecode/csharpier/out.cs

@@ -0,0 +1,11 @@
+public class ClassName
+{
+    public void CallMethod()
+    {
+        this.LongUglyMethod(
+            "1234567890",
+            "abcdefghijklmnopqrstuvwxyz",
+            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+        );
+    }
+}