Add SQL support

Closes #311

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Parsing
 
+Added SQL support.
+
 Updated to the latest tree-sitter parsers for C#, Dart, Elm, Gleam,
 Haskell, HCL, Java, JSON, OCaml, PHP, Python, Ruby, Scala and
 TypeScript.

build.rs

@@ -228,6 +228,11 @@ fn main() {
             src_dir: "vendor/tree-sitter-scala-src",
             extra_files: vec!["scanner.c"],
         },
+        TreeSitterParser {
+            name: "tree-sitter-sql",
+            src_dir: "vendor/tree-sitter-sql-src",
+            extra_files: vec!["scanner.cc"],
+        },
         TreeSitterParser {
             name: "tree-sitter-swift",
             src_dir: "vendor/tree-sitter-swift-src",

src/diff/sliders.rs

@@ -60,6 +60,10 @@ fn prefer_outer_delimiter(language: guess_language::Language) -> bool {
         // JSON and TOML are like Lisp: the outer delimiter in an array object
         // is the most relevant.
         Json | Toml | Hcl => true,
+        // It's probably the case that outer delimiters are used more
+        // frequently than inner delimiters in SQl. (foo = 1 OR bar = 2)
+        // is more likely than foo(1).
+        Sql => true,
         // For everything else, prefer the inner delimiter. These
         // languages have syntax like `foo(bar)` or `foo[bar]` where
         // the inner delimiter is more relevant.

src/parse/guess_language.rs

@@ -52,6 +52,7 @@ pub enum Language {
     Ruby,
     Rust,
     Scala,
+    Sql,
     Swift,
     Toml,
     Tsx,
@@ -127,6 +128,7 @@ fn from_emacs_mode_header(src: &str) -> Option<Language> {
             "rust" => Some(Rust),
             "scala" => Some(Scala),
             "sh" => Some(Bash),
+            "sql" => Some(Sql),
             "swift" => Some(Swift),
             "toml" => Some(Toml),
             "tuareg" => Some(OCaml),
@@ -245,6 +247,7 @@ pub fn from_extension(extension: &OsStr) -> Option<Language> {
         "rb" | "builder" | "spec" | "rake" => Some(Ruby),
         "rs" => Some(Rust),
         "scala" | "sbt" | "sc" => Some(Scala),
+        "sql" | "pgsql" => Some(Sql),
         "swift" => Some(Swift),
         "toml" => Some(Toml),
         "ts" => Some(TypeScript),

src/parse/tree_sitter_parser.rs

@@ -76,6 +76,7 @@ extern "C" {
     fn tree_sitter_ruby() -> ts::Language;
     fn tree_sitter_rust() -> ts::Language;
     fn tree_sitter_scala() -> ts::Language;
+    fn tree_sitter_sql() -> ts::Language;
     fn tree_sitter_swift() -> ts::Language;
     fn tree_sitter_toml() -> ts::Language;
     fn tree_sitter_tsx() -> ts::Language;
@@ -650,6 +651,20 @@ pub fn from_language(language: guess::Language) -> TreeSitterConfig {
                 .unwrap(),
             }
         }
+        Sql => {
+            let language = unsafe { tree_sitter_sql() };
+            TreeSitterConfig {
+                name: "SQL",
+                language,
+                atom_nodes: vec!["string", "identifier"].into_iter().collect(),
+                delimiter_tokens: vec![("(", ")")],
+                highlight_query: ts::Query::new(
+                    language,
+                    include_str!("../../vendor/highlights/sql.scm"),
+                )
+                .unwrap(),
+            }
+        }
         Swift => {
             let language = unsafe { tree_sitter_swift() };
             TreeSitterConfig {

vendor/highlights/sql.scm

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

vendor/tree-sitter-sql-src

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