Include shell completions in the executable

src/bin/bat/clap_app.rs

@@ -564,6 +564,17 @@ pub fn build_app(interactive_output: bool) -> Command {
                 .help("Do not load custom assets"),
         );
 
+    #[cfg(feature = "application")]
+    {
+        app = app.arg(
+            Arg::new("completion")
+            .long("completion")
+            .value_name("SHELL")
+            .value_parser(["bash", "fish", "ps1", "zsh"])
+            .help("Show shell completion for a certain shell. [possible values: bash, fish, zsh, ps1]"),
+        );
+    }
+
     #[cfg(feature = "lessopen")]
     {
         app = app

src/bin/bat/completions.rs

@@ -0,0 +1,6 @@
+use std::env;
+
+pub const BASH_COMPLETION: &str = include_str!(env!("BAT_GENERATED_COMPLETION_BASH"));
+pub const FISH_COMPLETION: &str = include_str!(env!("BAT_GENERATED_COMPLETION_FISH"));
+pub const PS1_COMPLETION: &str = include_str!(env!("BAT_GENERATED_COMPLETION_PS1"));
+pub const ZSH_COMPLETION: &str = include_str!(env!("BAT_GENERATED_COMPLETION_ZSH"));

src/bin/bat/main.rs

@@ -3,6 +3,8 @@
 mod app;
 mod assets;
 mod clap_app;
+#[cfg(feature = "application")]
+mod completions;
 mod config;
 mod directories;
 mod input;
@@ -347,6 +349,18 @@ fn run() -> Result<bool> {
         return Ok(true);
     }
 
+    #[cfg(feature = "application")]
+    if let Some(shell) = app.matches.get_one::<String>("completion") {
+        match shell.as_str() {
+            "bash" => println!("{}", completions::BASH_COMPLETION),
+            "fish" => println!("{}", completions::FISH_COMPLETION),
+            "ps1" => println!("{}", completions::PS1_COMPLETION),
+            "zsh" => println!("{}", completions::ZSH_COMPLETION),
+            _ => unreachable!("No completion for shell '{}' available.", shell),
+        }
+        return Ok(true);
+    }
+
     match app.matches.subcommand() {
         Some(("cache", cache_matches)) => {
             // If there is a file named 'cache' in the current working directory,