plot: Add start/end options

Author: quietvoid

README.md

@@ -152,6 +152,8 @@ dovi_tool <SUBCOMMAND> --help
 
     **Flags**:
     - `-t`, `--title` The title to set at the top of the plot
+    - `-s`, `--start` Set frame range start
+    - `-e`, `--end` Set frame range end (inclusive)
 
     **Example**:
     ```console

src/commands/plot.rs

@@ -33,4 +33,10 @@ pub struct PlotArgs {
 
     #[arg(long, short = 't', help = "Title to use at the top")]
     pub title: Option<String>,
+
+    #[arg(long, short = 's', help = "Set frame range start")]
+    pub start: Option<usize>,
+
+    #[arg(long, short = 'e', help = "Set frame range end (inclusive)")]
+    pub end: Option<usize>,
 }

src/dovi/plotter.rs

@@ -54,6 +54,8 @@ impl Plotter {
             input_pos,
             output,
             title,
+            start: start_arg,
+            end: end_arg,
         } = args;
 
         let output = output.unwrap_or(PathBuf::from("L1_plot.png"));
@@ -63,7 +65,12 @@ impl Plotter {
         let plotter = Plotter { input };
 
         println!("Parsing RPU file...");
-        let rpus = parse_rpu_file(plotter.input)?;
+        let orig_rpus = parse_rpu_file(plotter.input)?;
+
+        // inclusive range, end must be last RPU index
+        let start = start_arg.unwrap_or(0);
+        let end = end_arg.unwrap_or(orig_rpus.len() - 1);
+        let rpus = &orig_rpus[start..=end];
 
         let x_spec = 0..rpus.len();
 
@@ -74,7 +81,7 @@ impl Plotter {
             .titled(&title, ("sans-serif", 40))?;
 
         println!("Plotting...");
-        let summary = RpusListSummary::new(&rpus)?;
+        let summary = RpusListSummary::new(rpus)?;
 
         let mut chart = ChartBuilder::on(&root)
             .x_label_area_size(60)