fix: doesn't print the argument sections in the help message if all args in that section are hidden

Author: kbknapp

src/app/help.rs

@@ -540,10 +540,10 @@ impl<'a> Help<'a> {
     #[cfg_attr(feature = "lints", allow(useless_let_if_seq))]
     pub fn write_all_args(&mut self, parser: &Parser) -> ClapResult<()> {
         debugln!("Help::write_all_args;");
-        let flags = parser.has_flags();
-        let pos = parser.has_positionals();
-        let opts = parser.has_opts();
-        let subcmds = parser.has_subcommands();
+        let flags = parser.has_visible_flags();
+        let pos = parser.has_visible_positionals();
+        let opts = parser.has_visible_opts();
+        let subcmds = parser.has_visible_subcommands();
 
         let unified_help = parser.is_set(AppSettings::UnifiedHelpMessage);
 

src/app/parser.rs

@@ -555,6 +555,30 @@ impl<'a, 'b> Parser<'a, 'b>
     #[inline]
     pub fn has_subcommands(&self) -> bool { !self.subcommands.is_empty() }
 
+    #[inline]
+    pub fn has_visible_opts(&self) -> bool { 
+        if self.opts.is_empty() { return false; }  
+        self.opts.iter().any(|o| !o.is_set(ArgSettings::Hidden))
+    }
+
+    #[inline]
+    pub fn has_visible_flags(&self) -> bool { 
+        if self.flags.is_empty() { return false; }  
+        self.flags.iter().any(|f| !f.is_set(ArgSettings::Hidden))
+    }
+
+    #[inline]
+    pub fn has_visible_positionals(&self) -> bool { 
+        if self.positionals.is_empty() { return false; }  
+        self.positionals.values().any(|p| !p.is_set(ArgSettings::Hidden))
+    }
+
+    #[inline]
+    pub fn has_visible_subcommands(&self) -> bool { 
+        if self.subcommands.is_empty() { return false; }  
+        self.subcommands.iter().any(|s| !s.is_set(AppSettings::Hidden))
+    }
+
     #[inline]
     pub fn is_set(&self, s: AS) -> bool { self.settings.is_set(s) }