[feat] add diffLines function

src/lib.rs

@@ -17,6 +17,7 @@ register_module!(example, init);
 
 fn init(module: &mut Module) -> Result<()> {
   module.create_named_method("diffChars", diff_char)?;
+  module.create_named_method("diffLines", diff_line)?;
   Ok(())
 }
 
@@ -32,7 +33,34 @@ fn diff_char(ctx: CallContext) -> Result<JsObject> {
   let mut idx = 0;
   for it in res.iter() {
     let mut item = ctx.env.create_object().unwrap();
-    
+
+    item.set_named_property(
+      "count",
+      ctx.env.create_int64(it.count.try_into().unwrap()).unwrap(),
+    )?;
+    item.set_named_property("value", ctx.env.create_string(&it.value).unwrap())?;
+    item.set_named_property("added", ctx.env.get_boolean(it.added).unwrap())?;
+    item.set_named_property("removed", ctx.env.get_boolean(it.removed).unwrap())?;
+
+    obj.set_element(idx, item)?;
+    idx += 1;
+  }
+
+  Ok(obj)
+}
+
+#[js_function(2)]
+fn diff_line(ctx: CallContext) -> Result<JsObject> {
+  let str1: String = ctx.get::<JsString>(0)?.try_into()?;
+  let str2: String = ctx.get::<JsString>(1)?.try_into()?;
+  let res = mdiff::diff_lines(str1.as_str(), str2.as_str());
+
+  let mut obj = ctx.env.create_array_with_length(res.len()).unwrap();
+  let mut idx = 0;
+
+  for it in res.iter() {
+    let mut item = ctx.env.create_object().unwrap();
+
     item.set_named_property(
       "count",
       ctx.env.create_int64(it.count.try_into().unwrap()).unwrap(),

src/mdiff.rs

@@ -13,6 +13,14 @@ pub enum Mode {
   RIGHT,
 }
 
+fn get_line_res(s: &String, mode: Mode) -> Res {
+  Res {
+    count: s.split('\n').count(),
+    added: if mode == Mode::RIGHT { true } else { false },
+    removed: if mode == Mode::LEFT { true } else { false },
+    value: s.clone(),
+  }
+}
 fn get_res(s: &String, mode: Mode) -> Res {
   Res {
     count: s.chars().count(),
@@ -64,3 +72,54 @@ pub fn diff_chars(s1: &str, s2: &str) -> Vec<Res> {
 
   result
 }
+
+pub fn diff_lines(s1: &str, s2: &str) -> Vec<Res> {
+  let mut result: Vec<Res> = Vec::new();
+  let mut mode = Mode::INIT;
+  let mut s: String = String::new();
+
+  for d in diff::lines(s1, s2) {
+    match d {
+      diff::Result::Left(l) => {
+        if mode != Mode::LEFT && mode != Mode::INIT {
+          result.push(get_line_res(&s, mode));
+          s.clear();
+        }
+        mode = Mode::LEFT;
+        if s.len() > 0 {
+          s.push('\n')
+        }
+        s.push_str(l);
+      }
+      diff::Result::Right(r) => {
+        if mode != Mode::RIGHT && mode != Mode::INIT {
+          result.push(get_line_res(&s, mode));
+          s.clear();
+        }
+        mode = Mode::RIGHT;
+        if s.len() > 0 {
+          s.push('\n')
+        }
+        s.push_str(r);
+      }
+      diff::Result::Both(l, _) => {
+        if mode != Mode::BOTH && mode != Mode::INIT {
+          result.push(get_line_res(&s, mode));
+          s.clear()
+        }
+        mode = Mode::BOTH;
+        if s.len() > 0 {
+          s.push('\n')
+        }
+        s.push_str(l);
+      }
+    }
+  }
+
+  if s.len() > 0 {
+    result.push(get_line_res(&s, mode));
+    s.clear();
+  }
+
+  result
+}