feat: expand diff syntax highlighting languages

packages/app/src/utils/diff-highlighter.test.ts

@@ -59,6 +59,105 @@ index 1234567..0000000
 -export { legacy };
 `;
 
+const RUST_DIFF = `diff --git a/lib.rs b/lib.rs
+index 1234567..abcdefg 100644
+--- a/lib.rs
++++ b/lib.rs
+@@ -1,4 +1,4 @@
+ fn main() {
+-    let version = 1;
++    let version = 2;
+     println!("Hello, world!");
+ }
+`;
+
+const C_DIFF = `diff --git a/example.c b/example.c
+index 1234567..abcdefg 100644
+--- a/example.c
++++ b/example.c
+@@ -1,4 +1,4 @@
+ int main(void) {
+-    int version = 1;
++    int version = 2;
+     return version;
+ }
+`;
+
+const JAVA_DIFF = `diff --git a/Main.java b/Main.java
+index 1234567..abcdefg 100644
+--- a/Main.java
++++ b/Main.java
+@@ -1,5 +1,5 @@
+ public class Main {
+     public static void main(String[] args) {
+-        int version = 1;
++        int version = 2;
+     }
+ }
+`;
+
+const OBJECTIVE_C_DIFF = `diff --git a/AppDelegate.m b/AppDelegate.m
+index 1234567..abcdefg 100644
+--- a/AppDelegate.m
++++ b/AppDelegate.m
+@@ -1,4 +1,4 @@
+ int main(void) {
+-    int version = 1;
++    int version = 2;
+    return version;
+ }
+`;
+
+const GO_DIFF = `diff --git a/main.go b/main.go
+index 1234567..abcdefg 100644
+--- a/main.go
++++ b/main.go
+@@ -1,7 +1,7 @@
+ package main
+
+ import "fmt"
+
+ func main() {
+-    version := 1
++    version := 2
+     fmt.Println(version)
+ }
+`;
+
+const PHP_DIFF = `diff --git a/index.php b/index.php
+index 1234567..abcdefg 100644
+--- a/index.php
++++ b/index.php
+@@ -1,4 +1,4 @@
+ <?php
+-$version = 1;
++$version = 2;
+ echo $version;
+ ?>
+`;
+
+const YAML_DIFF = `diff --git a/config.yaml b/config.yaml
+index 1234567..abcdefg 100644
+--- a/config.yaml
++++ b/config.yaml
+@@ -1,3 +1,3 @@
+ app: paseo
+-count: 1
++count: 2
+ enabled: true
+`;
+
+const XML_DIFF = `diff --git a/config.xml b/config.xml
+index 1234567..abcdefg 100644
+--- a/config.xml
++++ b/config.xml
+@@ -1,3 +1,3 @@
+ <config>
+-  <count>1</count>
++  <count>2</count>
+ </config>
+`;
+
 describe("parseDiff", () => {
   it("parses a simple diff with one hunk", () => {
     const files = parseDiff(SIMPLE_DIFF);
@@ -251,6 +350,124 @@ describe("highlightDiffFile", () => {
     expect(highlighted.hunks[0].lines[1].tokens).toBeUndefined();
     expect(highlighted.hunks[0].lines[2].tokens).toBeUndefined();
   });
+
+  it("adds syntax highlighting tokens to Rust code", () => {
+    const files = parseDiff(RUST_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const hunk = highlighted.hunks[0];
+
+    const fnLine = hunk.lines[1];
+    expect(fnLine.tokens).toBeDefined();
+    expect(fnLine.tokens!.some((t) => t.text === "fn" && t.style === "keyword")).toBe(true);
+
+    const addedLine = hunk.lines.find(
+      (line) => line.type === "add" && line.content.includes("version")
+    );
+    expect(addedLine?.tokens).toBeDefined();
+    expect(
+      addedLine!.tokens!.some((t) => t.text === "2" && t.style === "number")
+    ).toBe(true);
+  });
+
+  it("adds syntax highlighting tokens to C code", () => {
+    const files = parseDiff(C_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const hunk = highlighted.hunks[0];
+
+    const mainLine = hunk.lines[1];
+    expect(mainLine.tokens).toBeDefined();
+    expect(mainLine.tokens!.length).toBeGreaterThan(0);
+
+    const addedLine = hunk.lines.find(
+      (line) => line.type === "add" && line.content.includes("version")
+    );
+    expect(addedLine?.tokens).toBeDefined();
+    expect(
+      addedLine!.tokens!.some((t) => t.text === "2" && t.style === "number")
+    ).toBe(true);
+  });
+
+  it("adds syntax highlighting tokens to Java code", () => {
+    const files = parseDiff(JAVA_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const hunk = highlighted.hunks[0];
+
+    const classLine = hunk.lines[1];
+    expect(classLine.tokens).toBeDefined();
+    expect(
+      classLine.tokens!.some((t) => t.text === "public" && t.style === "keyword")
+    ).toBe(true);
+
+    const addedLine = hunk.lines.find(
+      (line) => line.type === "add" && line.content.includes("version")
+    );
+    expect(addedLine?.tokens).toBeDefined();
+    expect(
+      addedLine!.tokens!.some((t) => t.text === "2" && t.style === "number")
+    ).toBe(true);
+  });
+
+  it("adds syntax highlighting tokens to Objective-C file extensions", () => {
+    const files = parseDiff(OBJECTIVE_C_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const hunk = highlighted.hunks[0];
+
+    const addedLine = hunk.lines.find(
+      (line) => line.type === "add" && line.content.includes("version")
+    );
+    expect(addedLine?.tokens).toBeDefined();
+    expect(
+      addedLine!.tokens!.some((t) => t.text === "2" && t.style === "number")
+    ).toBe(true);
+  });
+
+  it("adds syntax highlighting tokens to Go code", () => {
+    const files = parseDiff(GO_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const addedLine = highlighted.hunks[0].lines.find(
+      (line) => line.type === "add" && line.content.includes("version")
+    );
+
+    expect(addedLine?.tokens).toBeDefined();
+    expect(
+      addedLine!.tokens!.some((t) => t.text === "2" && t.style === "number")
+    ).toBe(true);
+  });
+
+  it("adds syntax highlighting tokens to PHP code", () => {
+    const files = parseDiff(PHP_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const addedLine = highlighted.hunks[0].lines.find(
+      (line) => line.type === "add" && line.content.includes("$version")
+    );
+
+    expect(addedLine?.tokens).toBeDefined();
+    expect(
+      addedLine!.tokens!.some((t) => t.text === "2" && t.style === "number")
+    ).toBe(true);
+  });
+
+  it("adds syntax highlighting tokens to YAML code", () => {
+    const files = parseDiff(YAML_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const addedLine = highlighted.hunks[0].lines.find(
+      (line) => line.type === "add" && line.content.includes("count")
+    );
+
+    expect(addedLine?.tokens).toBeDefined();
+    expect(addedLine!.tokens!.length).toBeGreaterThan(0);
+  });
+
+  it("adds syntax highlighting tokens to XML code", () => {
+    const files = parseDiff(XML_DIFF);
+    const highlighted = highlightDiffFile(files[0]);
+    const addedLine = highlighted.hunks[0].lines.find(
+      (line) => line.type === "add" && line.content.includes("<count>")
+    );
+
+    expect(addedLine?.tokens).toBeDefined();
+    expect(addedLine!.tokens!.some((t) => t.style === "tag")).toBe(true);
+  });
 });
 
 describe("parseAndHighlightDiff", () => {

packages/app/src/utils/syntax-highlighter.ts

@@ -2,9 +2,16 @@ import { highlightTree, tagHighlighter, tags } from "@lezer/highlight";
 import { parser as jsParser } from "@lezer/javascript";
 import { parser as jsonParser } from "@lezer/json";
 import { parser as cssParser } from "@lezer/css";
+import { parser as cppParser } from "@lezer/cpp";
+import { parser as goParser } from "@lezer/go";
 import { parser as htmlParser } from "@lezer/html";
+import { parser as javaParser } from "@lezer/java";
 import { parser as pythonParser } from "@lezer/python";
 import { parser as markdownParser } from "@lezer/markdown";
+import { parser as phpParser } from "@lezer/php";
+import { parser as rustParser } from "@lezer/rust";
+import { parser as xmlParser } from "@lezer/xml";
+import { parser as yamlParser } from "@lezer/yaml";
 import { parser as elixirParser } from "lezer-elixir";
 import type { Parser } from "@lezer/common";
 
@@ -17,6 +24,16 @@ const parsersByExtension: Record<string, Parser> = {
   tsx: jsParser.configure({ dialect: "tsx jsx" }),
   mjs: jsParser,
   cjs: jsParser,
+  // C / C++ / Objective-C
+  c: cppParser,
+  h: cppParser,
+  cc: cppParser,
+  cpp: cppParser,
+  cxx: cppParser,
+  hpp: cppParser,
+  hxx: cppParser,
+  m: cppParser,
+  mm: cppParser,
   // JSON
   json: jsonParser,
   // CSS
@@ -25,8 +42,21 @@ const parsersByExtension: Record<string, Parser> = {
   // HTML
   html: htmlParser,
   htm: htmlParser,
+  // XML
+  xml: xmlParser,
+  // Java
+  java: javaParser,
   // Python
   py: pythonParser,
+  // Go
+  go: goParser,
+  // PHP
+  php: phpParser,
+  // YAML
+  yaml: yamlParser,
+  yml: yamlParser,
+  // Rust
+  rs: rustParser,
   // Elixir
   ex: elixirParser,
   exs: elixirParser,