Fix CLI argument parsing to use hyphens in hardsubx parameters

- Change --conf_thresh to --conf-thresh
- Change --detect_italics to --detect-italics
- Change --whiteness_thresh to --whiteness-thresh
- Change --ocr_mode to --ocr-mode
- Change --min_sub_duration to --min-sub-duration

This matches the convention of using hyphens in CLI arguments while
keeping underscores in variable names.

Author: prateekmedia

src/rust/src/args.rs

@@ -47,7 +47,7 @@ http://www.ccextractor.org
 #[command(
     help_template = "{name} {version}, {author}.\n{about}\n {all-args} {tab}\n
 An example command for burned-in subtitle extraction is as follows:
-ccextractor video.mp4 --hardsubx --subcolor white --detect_italics --whiteness_thresh 90 --conf_thresh 60
+ccextractor video.mp4 --hardsubx --subcolor white --detect-italics --whiteness-thresh 90 --conf-thresh 60
 
 Notes on File name related options:
   You can pass as many input files as you need. They will be processed in order.
@@ -876,7 +876,7 @@ pub struct Args {
     /// or letter wise.
     /// e.g. --ocr-mode frame (default), --ocr-mode word,
     /// --ocr-mode letter
-    #[arg(long, verbatim_doc_comment, value_name="mode", help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
+    #[arg(long = "ocr-mode", verbatim_doc_comment, value_name="mode", help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
     pub ocr_mode: Option<String>,
     /// Specify the color of the subtitles
     /// Possible values are in the set
@@ -893,29 +893,29 @@ pub struct Args {
     /// A lower value gives better results, but takes more
     /// processing time.
     /// The recommended value is 0.5 (default).
-    /// e.g. --min_sub_duration 1.0 (for a duration of 1 second)
-    #[arg(long, verbatim_doc_comment, value_name="duration", help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
+    /// e.g. --min-sub-duration 1.0 (for a duration of 1 second)
+    #[arg(long = "min-sub-duration", verbatim_doc_comment, value_name="duration", help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
     pub min_sub_duration: Option<f32>,
     /// Specify whether italics are to be detected from the
     /// OCR text.
     /// Italic detection automatically enforces the OCR mode
     /// to be word-wise
-    #[arg(long, verbatim_doc_comment, help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
+    #[arg(long = "detect-italics", verbatim_doc_comment, help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
     pub detect_italics: bool,
     /// Specify the classifier confidence threshold between
     /// 1 and 100.
     /// Try and use a threshold which works for you if you get
     /// a lot of garbage text.
-    /// e.g. --conf_thresh 50
-    #[arg(long, verbatim_doc_comment, help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
+    /// e.g. --conf-thresh 50
+    #[arg(long = "conf-thresh", verbatim_doc_comment, help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
     pub conf_thresh: Option<f32>,
     /// For white subtitles only, specify the luminance
     /// threshold between 1 and 100
     /// This threshold is content dependent, and adjusting
     /// values may give you better results
     /// Recommended values are in the range 80 to 100.
     /// The default value is 95
-    #[arg(long, verbatim_doc_comment, value_name="threshold", help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
+    #[arg(long = "whiteness-thresh", verbatim_doc_comment, value_name="threshold", help_heading=BURNEDIN_SUBTITLE_EXTRACTION)]
     pub whiteness_thresh: Option<f32>,
     /// This option will be used if the file should have both
     /// closed captions and burned in subtitles