Added -S flag for truncating long lines

CHANGELOG.md

@@ -1,6 +1,7 @@
 # unreleased
 
 ## Features
+- Implemented `-S` and `--chop-long-lines` flags as aliases for `--wrap=never`. See #2309 (@johnmatthiggins)
 
 ## Bugfixes
 

src/bin/bat/app.rs

@@ -161,17 +161,21 @@ impl App {
                 }),
             show_nonprintable: self.matches.get_flag("show-all"),
             wrapping_mode: if self.interactive_output || maybe_term_width.is_some() {
-                match self.matches.get_one::<String>("wrap").map(|s| s.as_str()) {
-                    Some("character") => WrappingMode::Character,
-                    Some("never") => WrappingMode::NoWrapping(true),
-                    Some("auto") | None => {
-                        if style_components.plain() {
-                            WrappingMode::NoWrapping(false)
-                        } else {
-                            WrappingMode::Character
+                if !self.matches.contains_id("chop-long-lines") {
+                    match self.matches.get_one::<String>("wrap").map(|s| s.as_str()) {
+                        Some("character") => WrappingMode::Character,
+                        Some("never") => WrappingMode::NoWrapping(true),
+                        Some("auto") | None => {
+                            if style_components.plain() {
+                                WrappingMode::NoWrapping(false)
+                            } else {
+                                WrappingMode::Character
+                            }
                         }
+                        _ => unreachable!("other values for --wrap are not allowed"),
                     }
-                    _ => unreachable!("other values for --wrap are not allowed"),
+                } else {
+                    WrappingMode::NoWrapping(true)
                 }
             } else {
                 // We don't have the tty width when piping to another program.

src/bin/bat/clap_app.rs

@@ -201,6 +201,13 @@ pub fn build_app(interactive_output: bool) -> Command<'static> {
                            The '--terminal-width' option can be used in addition to \
                            control the output width."),
         )
+        .arg(
+            Arg::new("chop-long-lines")
+                .long("chop-long-lines")
+                .short('S')
+                .takes_value(false)
+                .help("Truncate all lines longer than screen width. Alias for '--wrap=never'."),
+        )
         .arg(
             Arg::new("terminal-width")
                 .long("terminal-width")

tests/examples/long-single-line.txt

@@ -0,0 +1 @@
+abcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyz

tests/integration_tests.rs

@@ -1499,6 +1499,47 @@ fn ignored_suffix_arg() {
         .stderr("");
 }
 
+fn wrapping_test(wrap_flag: &str, expect_wrap: bool) {
+    let expected = match expect_wrap {
+        true =>
+            "abcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyzabcde\nfghigklmnopqrstuvxyz\n",
+        false =>
+            "abcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyzabcdefghigklmnopqrstuvxyz\n",
+    };
+
+    bat()
+        .arg(wrap_flag)
+        .arg("--style=rule")
+        .arg("--color=never")
+        .arg("--decorations=always")
+        .arg("--terminal-width=80")
+        .arg("long-single-line.txt")
+        .assert()
+        .success()
+        .stdout(expected.to_owned())
+        .stderr("");
+}
+
+#[test]
+fn no_line_wrapping_when_set_to_never() {
+    wrapping_test("--wrap=never", false);
+}
+
+#[test]
+fn line_wrapping_when_auto() {
+    wrapping_test("--wrap=auto", true);
+}
+
+#[test]
+fn no_line_wrapping_with_s_flag() {
+    wrapping_test("-S", false);
+}
+
+#[test]
+fn no_wrapping_with_chop_long_lines() {
+    wrapping_test("--chop-long-lines", false);
+}
+
 #[test]
 fn highlighting_is_skipped_on_long_lines() {
     let expected = "\u{1b}[38;5;231m{\u{1b}[0m\u{1b}[38;5;208m\"\u{1b}[0m\u{1b}[38;5;208mapi\u{1b}[0m\u{1b}[38;5;208m\"\u{1b}[0m\u{1b}[38;5;231m:\u{1b}[0m\n".to_owned() +