Add cmd to dump layout to stdout

Adds the ability to dump the default layouts to
stdout, similar to the `zellij setup --dump-config`,
but now it needs the name of a currently existing
layout:

- default
- strider
- disable-status

`zellij setup --dump-layout [LAYOUT]`

src/main.rs

@@ -36,8 +36,14 @@ pub fn main() {
     let config_options = Options::from_cli(&config.options, opts.command.clone());
 
     if let Some(Command::Setup(ref setup)) = opts.command {
-        Setup::from_cli(setup, &opts, &config_options).expect("Failed to print to stdout");
-    }
+        Setup::from_cli(setup, &opts, &config_options).map_or_else(
+            |e| {
+                eprintln!("{:?}", e);
+                process::exit(1);
+            },
+            |_| {},
+        );
+    };
 
     atomic_create_dir(&*ZELLIJ_TMP_DIR).unwrap();
     atomic_create_dir(&*ZELLIJ_TMP_LOG_DIR).unwrap();

zellij-utils/src/setup.rs

@@ -96,13 +96,25 @@ pub const STRIDER_LAYOUT: &[u8] = include_bytes!(concat!(
 pub const NO_STATUS_LAYOUT: &[u8] = include_bytes!(concat!(
     env!("CARGO_MANIFEST_DIR"),
     "/",
-    "assets/layouts/default.yaml"
+    "assets/layouts/disable-status-bar.yaml"
 ));
 
 pub fn dump_default_config() -> std::io::Result<()> {
     dump_asset(DEFAULT_CONFIG)
 }
 
+pub fn dump_specified_layout(layout: &str) -> std::io::Result<()> {
+    match layout {
+        "strider" => dump_asset(STRIDER_LAYOUT),
+        "default" => dump_asset(DEFAULT_LAYOUT),
+        "disable-status" => dump_asset(NO_STATUS_LAYOUT),
+        not_found => Err(std::io::Error::new(
+            std::io::ErrorKind::Other,
+            format!("Layout: {} not found", not_found),
+        )),
+    }
+}
+
 #[derive(Debug, Default, Clone, StructOpt, Serialize, Deserialize)]
 pub struct Setup {
     /// Dump the default configuration file to stdout
@@ -117,6 +129,9 @@ pub struct Setup {
     #[structopt(long)]
     pub check: bool,
 
+    /// Dump the specified layout file to stdout
+    #[structopt(long)]
+    pub dump_layout: Option<String>,
     /// Generates completion for the specified shell
     #[structopt(long)]
     pub generate_completion: Option<String>,
@@ -144,6 +159,11 @@ impl Setup {
             std::process::exit(0);
         }
 
+        if let Some(layout) = &self.dump_layout {
+            dump_specified_layout(layout)?;
+            std::process::exit(0);
+        }
+
         Ok(())
     }