refavtor: Prepare for help flattening

clap_builder/src/builder/command.rs

@@ -3335,6 +3335,20 @@ impl Command {
         self.usage_name.as_deref()
     }
 
+    #[inline]
+    #[cfg(feature = "usage")]
+    pub(crate) fn get_usage_name_fallback(&self) -> &str {
+        self.get_usage_name()
+            .unwrap_or_else(|| self.get_bin_name_fallback())
+    }
+
+    #[inline]
+    #[cfg(not(feature = "usage"))]
+    #[allow(dead_code)]
+    pub(crate) fn get_usage_name_fallback(&self) -> &str {
+        self.get_bin_name_fallback()
+    }
+
     /// Get the name of the binary.
     #[inline]
     pub fn get_display_name(&self) -> Option<&str> {
@@ -3347,6 +3361,12 @@ impl Command {
         self.bin_name.as_deref()
     }
 
+    /// Get the name of the binary.
+    #[inline]
+    pub(crate) fn get_bin_name_fallback(&self) -> &str {
+        self.bin_name.as_deref().unwrap_or_else(|| self.get_name())
+    }
+
     /// Set binary name. Uses `&mut self` instead of `self`.
     pub fn set_bin_name(&mut self, name: impl Into<String>) {
         self.bin_name = Some(name.into());

clap_builder/src/output/usage.rs

@@ -135,7 +135,7 @@ impl<'cmd> Usage<'cmd> {
         let literal = &self.styles.get_literal();
         let placeholder = &self.styles.get_placeholder();
 
-        let bin_name = self.get_name();
+        let bin_name = self.cmd.get_usage_name_fallback();
         if !bin_name.is_empty() {
             // the trim won't properly remove a leading space due to the formatting
             let _ = write!(
@@ -176,7 +176,7 @@ impl<'cmd> Usage<'cmd> {
                 styled.trim_end();
                 let _ = write!(styled, "{}", USAGE_SEP);
                 if self.cmd.is_args_conflicts_with_subcommands_set() {
-                    let bin_name = self.get_name();
+                    let bin_name = self.cmd.get_usage_name_fallback();
                     // Short-circuit full usage creation since no args will be relevant
                     let _ = write!(
                         styled,
@@ -211,13 +211,6 @@ impl<'cmd> Usage<'cmd> {
         }
     }
 
-    fn get_name(&self) -> &str {
-        self.cmd
-            .get_usage_name()
-            .or_else(|| self.cmd.get_bin_name())
-            .unwrap_or_else(|| self.cmd.get_name())
-    }
-
     // Determines if we need the `[OPTIONS]` tag in the usage string
     fn needs_options_tag(&self) -> bool {
         debug!("Usage::needs_options_tag");

clap_builder/src/parser/parser.rs

@@ -501,10 +501,7 @@ impl<'cmd> Parser<'cmd> {
                     self.cmd,
                     arg_os.display().to_string(),
                     candidates,
-                    self.cmd
-                        .get_bin_name()
-                        .unwrap_or_else(|| self.cmd.get_name())
-                        .to_owned(),
+                    self.cmd.get_bin_name_fallback().to_owned(),
                     suggested_trailing_arg,
                     Usage::new(self.cmd).create_usage_with_title(&[]),
                 );

clap_builder/src/parser/validator.rs

@@ -63,10 +63,7 @@ impl<'cmd> Validator<'cmd> {
             }
         }
         if !has_subcmd && self.cmd.is_subcommand_required_set() {
-            let bn = self
-                .cmd
-                .get_bin_name()
-                .unwrap_or_else(|| self.cmd.get_name());
+            let bn = self.cmd.get_bin_name_fallback();
             return Err(Error::missing_subcommand(
                 self.cmd,
                 bn.to_string(),