refactor: move the lang argument to the command file

Author: Phosphorus-M

src/cmd/build.rs

@@ -11,9 +11,7 @@ pub fn make_subcommand() -> Command {
         .arg_dest_dir()
         .arg_root_dir()
         .arg_open()
-        .arg(Arg::new("language").short('l').long("language").num_args(1).value_parser(clap::value_parser!(String)).help("Language to render the compiled book in.{n}\
-        Only valid if the [language] table in the config is not empty.{n}\
-        If omitted, builds all translations and provides a menu in the generated output for switching between them."))
+        .arg_language()
 }
 
 // Build command implementation

src/cmd/clean.rs

@@ -11,9 +11,7 @@ pub fn make_subcommand() -> Command {
         .about("Deletes a built book")
         .arg_dest_dir()
         .arg_root_dir()
-        .arg(Arg::new("language").short('l').long("language").num_args(1).value_parser(clap::value_parser!(String)).help("Language to render the compiled book in.{n}\
-        Only valid if the [language] table in the config is not empty.{n}\
-        If omitted, builds all translations and provides a menu in the generated output for switching between them."))
+        .arg_language()
 }
 
 // Clean command implementation

src/cmd/command_prelude.rs

@@ -36,6 +36,19 @@ pub trait CommandExt: Sized {
     fn arg_open(self) -> Self {
         self._arg(arg!(-o --open "Opens the compiled book in a web browser"))
     }
+
+    fn arg_language(self) -> Self {
+        self._arg(
+            Arg::new("language")
+            .short('l')
+            .long("language")
+            .num_args(1)
+            .value_parser(clap::value_parser!(String))
+            .help("Language to render the compiled book in.{n}\
+                Only valid if the [language] table in the config is not empty.{n}\
+                If omitted, builds all translations and provides a menu in the generated output for switching between them.")
+            )
+    }
 }
 
 impl CommandExt for Command {

src/cmd/serve.rs

@@ -44,9 +44,7 @@ pub fn make_subcommand() -> Command {
                 .help("Port to use for HTTP connections"),
         )
         .arg_open()
-        .arg(Arg::new("language").short('l').long("language").num_args(1).value_parser(clap::value_parser!(String)).help("Language to render the compiled book in.{n}\
-        Only valid if the [language] table in the config is not empty.{n}\
-        If omitted, builds all translations and provides a menu in the generated output for switching between them."))
+        .arg_language()
 }
 
 // Serve command implementation

src/cmd/test.rs

@@ -32,9 +32,7 @@ pub fn make_subcommand() -> Command {
                     search path when building tests",
                 ),
         )
-        .arg(arg!(-l --language "Language to render the compiled book in.{n}\
-                         Only valid if the [language] table in the config is not empty.{n}\
-                         If omitted, builds all translations and provides a menu in the generated output for switching between them."))
+        .arg_language()
 }
 
 // test command implementation

src/cmd/watch.rs

@@ -17,11 +17,7 @@ pub fn make_subcommand() -> Command {
         .arg_dest_dir()
         .arg_root_dir()
         .arg_open()
-        .arg(arg!(
-            -l --language "Language to render the compiled book in.{n}\
-                         Only valid if the [language] table in the config is not empty.{n}\
-                         If omitted, builds all translations and provides a menu in the generated output for switching between them.")
-        )
+        .arg_language()
 }
 
 // Watch command implementation