Pull out buffer into its own crate

buffer/src/language.rs

@@ -0,0 +1,40 @@
+use crate::{HighlightMap, SyntaxTheme};
+use parking_lot::Mutex;
+use serde::Deserialize;
+use std::str;
+use tree_sitter::{Language as Grammar, Query};
+pub use tree_sitter::{Parser, Tree};
+
+#[derive(Default, Deserialize)]
+pub struct LanguageConfig {
+    pub name: String,
+    pub path_suffixes: Vec<String>,
+}
+
+#[derive(Deserialize)]
+pub struct BracketPair {
+    pub start: String,
+    pub end: String,
+}
+
+pub struct Language {
+    pub config: LanguageConfig,
+    pub grammar: Grammar,
+    pub highlight_query: Query,
+    pub brackets_query: Query,
+    pub highlight_map: Mutex<HighlightMap>,
+}
+
+impl Language {
+    pub fn name(&self) -> &str {
+        self.config.name.as_str()
+    }
+
+    pub fn highlight_map(&self) -> HighlightMap {
+        self.highlight_map.lock().clone()
+    }
+
+    pub fn set_theme(&self, theme: &SyntaxTheme) {
+        *self.highlight_map.lock() = HighlightMap::new(self.highlight_query.capture_names(), theme);
+    }
+}