feat: use Arc & Mutex for LepTess

swordfish-common/src/tesseract.rs

@@ -1 +1,13 @@
-pub use leptess::LepTess;
+pub use leptess::{LepTess, Variable};
+
+pub fn init_tesseract() -> Result<LepTess, String> {
+    let mut lep_tess = match LepTess::new(None, "eng") {
+        Ok(lep_tess) => lep_tess,
+        Err(why) => return Err(format!("Failed to initialize Tesseract: {:?}", why)),
+    };
+    match lep_tess.set_variable(Variable::TesseditCharWhitelist, "0123456789") {
+        Ok(_) => (),
+        Err(why) => return Err(format!("Failed to set whitelist: {:?}", why)),
+    };
+    Ok(lep_tess)
+}