Add C support

CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 0.10 (unreleased)
 
-No changes.
+### Parsing
+
+Added a C parser.
 
 ## 0.9
 

README.md

@@ -16,6 +16,7 @@ See [the manual](http://difftastic.wilfred.me.uk/) to get started.
 
 Difftastic supports the following languages:
 
+* C
 * Clojure
 * CSS
 * Elixir

build.rs

@@ -36,6 +36,7 @@ fn main() {
     println!("cargo:rerun-if-changed=vendor");
 
     // TODO: build these in parallel.
+    build("tree-sitter-c", "vendor/tree-sitter-c-src", &[]);
     build("tree-sitter-clojure", "vendor/tree-sitter-clojure-src", &[]);
     build(
         "tree-sitter-css",

manual/src/introduction.md

@@ -1,8 +1,9 @@
 # Introduction
 
 Difftastic is a diff tool that understands syntax. It currently
-supports 14 languages:
+supports 15 languages:
 
+* C
 * Clojure
 * CSS
 * Elixir

src/tree_sitter_parser.rs

@@ -25,6 +25,7 @@ pub struct TreeSitterConfig {
 }
 
 extern "C" {
+    fn tree_sitter_c() -> Language;
     fn tree_sitter_clojure() -> Language;
     fn tree_sitter_css() -> Language;
     fn tree_sitter_elisp() -> Language;
@@ -45,6 +46,15 @@ pub fn from_extension(extension: &OsStr) -> Option<TreeSitterConfig> {
     // TODO: find a nice way to extract name and extension information
     // from the package.json in these parsers.
     match extension.to_string_lossy().borrow() {
+        "c" | "h" => Some(TreeSitterConfig {
+            name: "C",
+            language: unsafe { tree_sitter_c() },
+            atom_nodes: (vec!["string_literal", "char_literal"])
+                .into_iter()
+                .collect(),
+            // TODO: Handle array_declarator where [ is the second token.
+            open_delimiter_tokens: (vec!["(", "{"]).into_iter().collect(),
+        }),
         "bb" | "boot" | "clj" | "cljc" | "clje" | "cljs" | "cljx" | "edn" | "joke" | "joker" => {
             Some(TreeSitterConfig {
                 name: "Clojure",

vendor/tree-sitter-c-src

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