imp(Usage): re-orders optional arguments and required to natural stan…

…dard

Also renamed is '[POSITIONAL]' => '[ARGS]' to use the more standard
vernacular

Closes #147

clap-tests/run_tests.py

@@ -12,7 +12,7 @@
 tests clap library
 
 USAGE:
-	claptests [POSITIONAL] [FLAGS] [OPTIONS] [SUBCOMMANDS]
+	claptests [FLAGS] [OPTIONS] [ARGS] [SUBCOMMAND]
 
 FLAGS:
     -f, --flag       tests flags
@@ -29,7 +29,7 @@
         --long-option-2 <option2>    tests long options with exclusions
     -O, --Option <option3>           tests options with specific value sets [values: fast, slow]
 
-POSITIONAL ARGUMENTS:
+ARGS:
     positional          tests positionals
     positional2         tests positionals with exclusions
     positional3...      tests positionals with specific values [values: emacs, vi]
@@ -44,7 +44,7 @@
 If you received this message in error, try re-running with 'claptests -- subcm'
 
 USAGE:
-	claptests [POSITIONAL] [FLAGS] [OPTIONS] [SUBCOMMANDS]
+	claptests [FLAGS] [OPTIONS] [ARGS] [SUBCOMMAND]
 
 For more information try --help'''
 
@@ -138,7 +138,7 @@
 tests subcommands
 
 USAGE:
-	claptests subcmd [POSITIONAL] [FLAGS] [OPTIONS]
+	claptests subcmd [FLAGS] [OPTIONS] [ARGS]
 
 FLAGS:
     -f, --flag       tests flags
@@ -148,7 +148,7 @@
 OPTIONS:
     -o, --option <scoption>...        tests options
 
-POSITIONAL ARGUMENTS:
+ARGS:
     scpositional      tests positionals'''
 
 _scfop = '''flag NOT present

src/app.rs

@@ -1178,21 +1178,23 @@ impl<'a, 'v, 'ab, 'u, 'h, 'ar> App<'a, 'v, 'ab, 'u, 'h, 'ar>{
                                         .fold(String::new(), |acc, s| {
                                             acc + &format!(" {}", s)[..]
                                         });
-            usage.push_str(&req_string[..]);
 
 
-            if !self.positionals_idx.is_empty() && self.positionals_idx.values()
-                                                                       .any(|a| !a.required) {
-                usage.push_str(" [POSITIONAL]");
-            }
             if !self.flags.is_empty() {
                 usage.push_str(" [FLAGS]");
             }
             if !self.opts.is_empty() && self.opts.values().any(|a| !a.required) {
                 usage.push_str(" [OPTIONS]");
             }
+            if !self.positionals_idx.is_empty() && self.positionals_idx.values()
+                                                                       .any(|a| !a.required) {
+                usage.push_str(" [ARGS]");
+            }
+
+            usage.push_str(&req_string[..]);
+
             if !self.subcommands.is_empty() {
-                usage.push_str(" [SUBCOMMANDS]");
+                usage.push_str(" [SUBCOMMAND]");
             }
         }
 
@@ -1331,7 +1333,7 @@ impl<'a, 'v, 'ab, 'u, 'h, 'ar> App<'a, 'v, 'ab, 'u, 'h, 'ar>{
         }
         if pos {
             println!("");
-            println!("POSITIONAL ARGUMENTS:");
+            println!("ARGS:");
             for v in self.positionals_idx.values() {
                 let mult = if v.multiple { 3 } else { 0 };
                 println!("{}{}{}{}",tab,