Add OcrOpt for transfer ocr options

It's avoid ocr dependends on command line struct.
This help better use as library.

src/lib.rs

@@ -4,7 +4,7 @@ mod ocr;
 mod opt;
 mod preprocessor;
 
-pub use crate::ocr::process as ocr_process;
+pub use crate::ocr::{process as ocr_process, OcrOpt};
 pub use crate::opt::Opt;
 pub use crate::preprocessor::{preprocess_subtitles, ImagePreprocessOpt};
 
@@ -55,7 +55,8 @@ pub fn run(opt: &Opt) -> anyhow::Result<()> {
         dump_images(&vobsubs)?;
     }
 
-    let subtitles = ocr::process(vobsubs, opt)?;
+    let ocr_opt = OcrOpt::new(&opt.tessdata_dir, opt.lang.as_str(), &opt.config, opt.dpi);
+    let subtitles = ocr::process(vobsubs, &ocr_opt)?;
     let subtitles = check_subtitles(subtitles)?;
 
     // Create subtitle file.

src/ocr.rs

@@ -1,6 +1,6 @@
 use std::{io::Cursor, str::Utf8Error};
 
-use crate::{opt::Opt, preprocessor::PreprocessedVobSubtitle};
+use crate::preprocessor::PreprocessedVobSubtitle;
 use image::{
     codecs::pnm::{PnmSubtype, SampleEncoding},
     DynamicImage, GrayImage,
@@ -17,6 +17,30 @@ use thiserror::Error;
 
 scoped_thread_local!(static mut TESSERACT: Option<TesseractWrapper>);
 
+/// Options for orc with Tesseract
+pub struct OcrOpt<'a> {
+    tessdata_dir: &'a Option<String>,
+    lang: &'a str,
+    config: &'a Vec<(Variable, String)>,
+    dpi: i32,
+}
+
+impl<'a> OcrOpt<'a> {
+    pub fn new(
+        tessdata_dir: &'a Option<String>,
+        lang: &'a str,
+        config: &'a Vec<(Variable, String)>,
+        dpi: i32,
+    ) -> Self {
+        Self {
+            tessdata_dir,
+            lang,
+            config,
+            dpi,
+        }
+    }
+}
+
 #[derive(Error, Debug)]
 pub enum Error {
     #[error("Could not build tesseract thread pool")]
@@ -42,7 +66,7 @@ pub type Result<T, E = Error> = std::result::Result<T, E>;
 
 pub fn process(
     vobsubs: Vec<PreprocessedVobSubtitle>,
-    opt: &Opt,
+    opt: &OcrOpt,
 ) -> Result<Vec<Result<(TimeSpan, String)>>> {
     std::env::set_var("OMP_THREAD_LIMIT", "1");
     let subs = rayon::ThreadPoolBuilder::new().build_scoped(
@@ -65,8 +89,8 @@ pub fn process(
                                         None => {
                                             let tesseract = TesseractWrapper::new(
                                                 opt.tessdata_dir.as_deref(),
-                                                &opt.lang,
-                                                &opt.config,
+                                                opt.lang,
+                                                opt.config,
                                             )?;
                                             maybe_tesseract.insert(tesseract)
                                         }