feat: support copy clipboard

Author: passchaos

Cargo.lock

@@ -18,3 +18,4 @@ termcolor = "1.1.3"
 clap = { version = "4.0.22", features = ["derive", "cargo"] }
 once_cell = "1.16.0"
 arboard = "3.2.0"
+parking_lot = "0.12.1"

Cargo.toml

@@ -5,12 +5,15 @@ use arboard::{Clipboard, GetExtLinux};
 use clap::Parser;
 use db::Answer;
 use explain::YdcvResp;
+use parking_lot::RwLock;
 
 mod db;
 mod explain;
 
 const REQUEST_BASE: &'static str = "http://fanyi.youdao.com/openapi.do?keyfrom=ydcv-rust&key=379421805&type=data&doctype=json&version=1.1&q=";
 
+static CACHED_CONTENT: RwLock<(Option<String>, Option<String>)> = RwLock::new((None, None));
+
 #[derive(Parser, Debug)]
 struct Args {
     word: Option<String>,
@@ -33,7 +36,34 @@ fn get_copied_text(clip: &mut Clipboard) -> Option<String> {
 }
 
 fn get_clipboard_content(clip: &mut Clipboard) -> Option<String> {
-    get_copied_text(clip).or_else(|| get_selected_text(clip))
+    let copied_text = get_copied_text(clip);
+    let selected_text = get_selected_text(clip);
+
+    let changed_copied_content = if let Some(copied_text) = copied_text {
+        if CACHED_CONTENT.read().0.as_ref() != Some(&copied_text) {
+            CACHED_CONTENT.write().0 = Some(copied_text.clone());
+
+            Some(copied_text)
+        } else {
+            None
+        }
+    } else {
+        None
+    };
+
+    let changed_selected_content = if let Some(selected_text) = selected_text {
+        if CACHED_CONTENT.read().1.as_ref() != Some(&selected_text) {
+            CACHED_CONTENT.write().1 = Some(selected_text.clone());
+
+            Some(selected_text)
+        } else {
+            None
+        }
+    } else {
+        None
+    };
+
+    changed_copied_content.or(changed_selected_content)
 }
 
 fn main() -> Result<()> {