added file diffing for file saving

src-tauri/src/file_handler.rs

@@ -2,12 +2,31 @@ use crate::{
     config::{get_open_file_path, set_open_file_path},
     get_basepath,
 };
+use diff_match_patch_rs::{Compat, DiffMatchPatch, Error, PatchInput};
 use std::fs::read_to_string;
 use std::path::Path;
 use tauri::{ipc::RuntimeCapability, App, AssetResolver, Manager, Url};
+
+fn compare_content(old_content: &str, new_content: &str) -> Result<String, Error> {
+    // initializing the module
+    let dmp = DiffMatchPatch::new();
+    // create a list of diffs
+    let diffs = dmp.diff_main::<Compat>(old_content, new_content)?;
+    // Now, we are going to create a list of `patches` to be applied to the old text to get the new text
+    let patches = dmp.patch_make(PatchInput::new_diffs(&diffs))?;
+    // in the real world you are going to transmit or store this diff serialized to undiff format to be consumed or used somewhere elese
+    let patch_txt = dmp.patch_to_text(&patches);
+
+    Ok(patch_txt)
+}
+
 #[tauri::command]
 pub async fn save_file(app_handle: tauri::AppHandle, content: String) {
-    println!("{:?}", get_open_file_path(app_handle));
+    if let Some(path) = get_open_file_path(app_handle.clone()) {
+        if let Ok(file_content) = load_file(app_handle, path).await {
+            println!("{:?}", compare_content(&file_content, &content));
+        }
+    }
 }
 
 #[tauri::command]