add elm syntax highlighting using tree-sitter-elm

Signed-off-by: Suraj Ghimire <suraj@ghishadow.com>

Cargo.lock

@@ -2179,6 +2179,7 @@ dependencies = [
  "tree-sitter-c",
  "tree-sitter-cpp",
  "tree-sitter-elixir",
+ "tree-sitter-elm",
  "tree-sitter-go",
  "tree-sitter-highlight",
  "tree-sitter-html",
@@ -4567,6 +4568,16 @@ dependencies = [
  "tree-sitter",
 ]
 
+[[package]]
+name = "tree-sitter-elm"
+version = "5.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d4c28acbbdb8a0d72a5eb181e05d29f664e6631c3182f1e3d9974ae900addf3"
+dependencies = [
+ "cc",
+ "tree-sitter",
+]
+
 [[package]]
 name = "tree-sitter-go"
 version = "0.19.1"

lapce-core/Cargo.toml

@@ -30,6 +30,7 @@ tree-sitter-json = { version = "0.19.0", optional = true }
 tree-sitter-md = { git = "https://github.com/MDeiml/tree-sitter-markdown.git", version = "0.0.1", optional = true  }
 tree-sitter-html = { version = "0.19.0", optional = true }
 tree-sitter-java = { git = "https://github.com/tree-sitter/tree-sitter-java.git", version = "0.20.0", optional = true  }
+tree-sitter-elm = { version = "5.6.0", optional = true }
 lsp-types = { version = "0.89.2", features = ["proposed"] }
 xi-rope = { git = "https://github.com/lapce/xi-editor", features = ["serde"] }
 lapce-rpc = { path = "../lapce-rpc" }
@@ -54,3 +55,4 @@ lang-json = ["dep:tree-sitter-json"]
 lang-md = ["dep:tree-sitter-md"]
 lang-html = ["dep:tree-sitter-html"]
 lang-java = ["dep:tree-sitter-java"]
+lang-elm = ["dep:tree-sitter-elm"]

lapce-core/src/language.rs

@@ -130,6 +130,8 @@ pub enum LapceLanguage {
     Html,
     #[cfg(feature = "lang-java")]
     Java,
+    #[cfg(feature = "lang-elm")]
+    Elm,
 }
 
 // NOTE: Elements in the array must be in the same order as the enum variants of
@@ -328,6 +330,16 @@ pub enum LapceLanguage {
         code_lens: (DEFAULT_CODE_LENS_LIST, DEFAULT_CODE_LENS_IGNORE_LIST),
         extensions: &["java"],
     },
+    #[cfg(feature = "lang-elm")]
+    SyntaxProperties {
+        id: LapceLanguage::Elm,
+        language: tree_sitter_elm::language,
+        highlight: tree_sitter_elm::HIGHLIGHTS_QUERY,
+        comment: "#",
+        indent: "    ",
+        code_lens: (DEFAULT_CODE_LENS_LIST, DEFAULT_CODE_LENS_IGNORE_LIST),
+        extensions: &["elm"],
+    },
 ];
 
 impl LapceLanguage {
@@ -546,4 +558,9 @@ fn test_html_lang() {
     fn test_java_lang() {
         assert_language(LapceLanguage::Java, &["java"]);
     }
+    #[test]
+    #[cfg(feature = "lang-elm")]
+    fn test_elm_lang() {
+        assert_language(LapceLanguage::Elm, &["elm"]);
+    }
 }

lapce-ui/Cargo.toml

@@ -73,7 +73,8 @@ all-languages = [
     "lang-json",
     "lang-md",
     "lang-html",
-    "lang-java"
+    "lang-java",
+    "lang-elm"
 ]
 lang-rust = ["lapce-core/lang-rust"]
 lang-go = ["lapce-core/lang-go"]
@@ -90,3 +91,4 @@ lang-json= ["lapce-core/lang-json"]
 lang-md = ["lapce-core/lang-md"]
 lang-html = ["lapce-core/lang-html"]
 lang-java = ["lapce-core/lang-java"]
+lang-elm = ["lapce-core/lang-elm"]