Add --squeeze/-s option

Co-authored-by: einfachIrgendwer0815 <85333734+einfachIrgendwer0815@users.noreply.github.com>

src/bin/bat/app.rs

@@ -290,6 +290,11 @@ impl App {
             #[cfg(feature = "lessopen")]
             use_lessopen: self.matches.get_flag("lessopen"),
             set_terminal_title: self.matches.get_flag("set-terminal-title"),
+            squeeze_lines: if self.matches.get_flag("squeeze") {
+                1
+            } else {
+                0
+            },
         })
     }
 

src/bin/bat/clap_app.rs

@@ -387,6 +387,14 @@ pub fn build_app(interactive_output: bool) -> Command {
                 .help("Display all supported highlighting themes.")
                 .long_help("Display a list of supported themes for syntax highlighting."),
         )
+        .arg(
+            Arg::new("squeeze")
+                .long("squeeze")
+                .short('s')
+                .action(ArgAction::SetTrue)
+                .help("Squeeze consecutive empty lines.")
+                .long_help("Squeeze consecutive empty lines into a single empty line.")
+        )
         .arg(
             Arg::new("style")
                 .long("style")