Add C# support

Closes #37.

CHANGELOG.md

@@ -7,6 +7,8 @@ Added a C parser.
 Added a C++ parser. Difftastic prefers the C++ parser for `.h`
 files. Please file a bug if you see issues.
 
+Added a C# parser.
+
 Added a Haskell parser.
 
 Removed legacy regex-based parsing backend.

README.md

@@ -18,6 +18,7 @@ Difftastic supports the following languages:
 
 * C
 * C++
+* C#
 * Clojure
 * CSS
 * Elixir

build.rs

@@ -60,6 +60,11 @@ fn main() {
             src_dir: "vendor/tree-sitter-cpp-src".into(),
             extra_files: vec!["scanner.cc".into()],
         },
+        TreeSitterParser {
+            name: "tree-sitter-c-sharp".into(),
+            src_dir: "vendor/tree-sitter-c-sharp-src".into(),
+            extra_files: vec!["scanner.c".into()],
+        },
         TreeSitterParser {
             name: "tree-sitter-clojure".into(),
             src_dir: "vendor/tree-sitter-clojure-src".into(),

manual/src/introduction.md

@@ -1,10 +1,11 @@
 # Introduction
 
 Difftastic is a diff tool that understands syntax. It currently
-supports 17 languages:
+supports 18 languages:
 
 * C
 * C++
+* C#
 * Clojure
 * CSS
 * Elixir

manual/src/upstream_parsers.md

@@ -6,6 +6,7 @@ Difftastic uses the following tree-sitter parsers:
 |-----------------|---------------------------------------------------------------------------------------------|
 | C               | [tree-sitter/tree-sitter-c](https://github.com/tree-sitter/tree-sitter-c)                   |
 | C++             | [tree-sitter/tree-sitter-cpp](https://github.com/tree-sitter/tree-sitter-cpp)               |
+| C#              | [tree-sitter/tree-sitter-c-sharp](https://github.com/tree-sitter/tree-sitter-c-sharp)       |
 | Clojure         | [sogaiu/tree-sitter-clojure](https://github.com/sogaiu/tree-sitter-clojure)                 |
 | CSS             | [tree-sitter/tree-sitter-css](https://github.com/tree-sitter/tree-sitter-css)               |
 | Elixir          | [ananthakumaran/tree-sitter-elixir](https://github.com/ananthakumaran/tree-sitter-elixir)   |

src/tree_sitter_parser.rs

@@ -26,6 +26,7 @@ pub struct TreeSitterConfig {
 
 extern "C" {
     fn tree_sitter_c() -> Language;
+    fn tree_sitter_c_sharp() -> Language;
     fn tree_sitter_clojure() -> Language;
     fn tree_sitter_cpp() -> Language;
     fn tree_sitter_css() -> Language;
@@ -81,6 +82,19 @@ pub fn from_extension(extension: &OsStr) -> Option<TreeSitterConfig> {
                 open_delimiter_tokens: (vec!["{", "(", "["]).into_iter().collect(),
             })
         }
+        "cs" => Some(TreeSitterConfig {
+            name: "C#",
+            language: unsafe { tree_sitter_c_sharp() },
+            atom_nodes: (vec![
+                "string_literal",
+                "verbatim_string_literal",
+                "character_literal",
+            ])
+            .into_iter()
+            .collect(),
+            // TODO: If statements have ( as the second item.
+            open_delimiter_tokens: (vec!["{", "("]).into_iter().collect(),
+        }),
         "css" => Some(TreeSitterConfig {
             name: "CSS",
             language: unsafe { tree_sitter_css() },

vendor/tree-sitter-c-sharp-src

@@ -0,0 +1 @@
+tree-sitter-c-sharp/src