Add agda, nix

Cargo.toml

@@ -65,4 +65,5 @@ ruby = []
 rust = []
 scala = []
 typescript = []
-
+nix = []
+agda = []

build.rs

@@ -45,6 +45,10 @@ fn main() {
         "scala",
         #[cfg(feature = "typescript")]
         "typescript",
+        #[cfg(feature = "nix")]
+        "nix",
+        #[cfg(feature = "agda")]
+        "agda",
     ] {
         println!("cargo:rustc-link-lib=static=tree-sitter-{lang}");
     }

flake.nix

@@ -22,14 +22,14 @@
           };
           sitters = tree-sitters.packages.${sys};
           sitterlist = [
-            sitters.agda sitters.bash sitters.c sitters.nix sitters.python sitters.rust
+            sitters.bash sitters.c sitters.python sitters.rust sitters.nix sitters.agda
           ];
 
           kak-tree-bin = platform.buildRustPackage {
           name = "kak-tree-bin";
           src = ./.;
           cargoLock = { lockFile = ./Cargo.lock; };
-          buildFeatures = ["bash" "c" "python" "rust"]; # TODO: Add agda, nix
+          buildFeatures = ["bash" "c" "python" "rust" "nix" "agda"];
           inherit sitterlist;
           preBuild = ''
             mkdir lib

src/ffi.rs

@@ -45,6 +45,10 @@ extern "C" {
     fn tree_sitter_scala() -> Language;
     #[cfg(feature = "typescript")]
     fn tree_sitter_typescript() -> Language;
+    #[cfg(feature = "nix")]
+    fn tree_sitter_nix() -> Language;
+    #[cfg(feature = "agda")]
+    fn tree_sitter_agda() -> Language;
 }
 
 pub fn filetype_to_language(filetype: &str) -> Option<Language> {
@@ -93,6 +97,10 @@ pub fn filetype_to_language(filetype: &str) -> Option<Language> {
         "scala" => tree_sitter_scala,
         #[cfg(feature = "typescript")]
         "typescript" => tree_sitter_typescript,
+        #[cfg(feature = "nix")]
+        "nix" => tree_sitter_nix,
+        #[cfg(feature = "agda")]
+        "agda" => tree_sitter_agda,
         _ => return None,
     };
     Some(unsafe { sitter() })