Add support for bash syntax

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ### Parsing
 
-Added Ruby support.
+Added Bash and Ruby support.
 
 Updated the C, CSS and JSON parsers to the latest upstream versions.
 

README.md

@@ -55,6 +55,7 @@ $ GIT_EXTERNAL_DIFF=difft git show --ext-diff 38805c6a882a9f00615078250ccc8c070c
 
 Difftastic supports the following languages:
 
+* Bash
 * C
 * C++
 * C#

build.rs

@@ -52,6 +52,11 @@ fn main() {
     println!("cargo:rerun-if-changed=vendor");
 
     let parsers = vec![
+        TreeSitterParser {
+            name: "tree-sitter-bash".into(),
+            src_dir: "vendor/tree-sitter-bash-src".into(),
+            extra_files: vec!["scanner.cc".into()],
+        },
         TreeSitterParser {
             name: "tree-sitter-c".into(),
             src_dir: "vendor/tree-sitter-c-src".into(),

manual/src/introduction.md

@@ -1,8 +1,9 @@
 # Introduction
 
 Difftastic ([source on GitHub](https://github.com/wilfred/difftastic)) is a diff
-tool that understands syntax. It currently supports 19 languages:
+tool that understands syntax. It supports the following languages:
 
+* Bash
 * C
 * C++
 * C#

src/tree_sitter_parser.rs

@@ -42,6 +42,7 @@ pub struct TreeSitterConfig {
 }
 
 extern "C" {
+    fn tree_sitter_bash() -> Language;
     fn tree_sitter_c() -> Language;
     fn tree_sitter_c_sharp() -> Language;
     fn tree_sitter_clojure() -> Language;
@@ -67,6 +68,13 @@ 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() {
+        "bash" | "sh" => Some(TreeSitterConfig {
+            name: "Bash",
+            language: unsafe { tree_sitter_bash() },
+            atom_nodes: (vec!["string", "raw_string"]).into_iter().collect(),
+            delimiter_tokens: (vec![("(", ")"), ("{", "}"), ("[", "]")]),
+            highlight_queries: include_str!("../vendor/highlights/bash.scm"),
+        }),
         "c" => Some(TreeSitterConfig {
             name: "C",
             language: unsafe { tree_sitter_c() },

vendor/highlights/bash.scm

@@ -0,0 +1 @@
+../tree-sitter-bash/queries/highlights.scm

vendor/tree-sitter-bash-src

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