feat(from_usage): adds ability to add value names or num of vals in usage string

Allows new usage strings with value names or number of values. If the
names are consecutive, they are counted to represent the number of
values (if they all have the same name), or if their names are different
they are used as value names.

Closes #98

src/args/arg.rs

@@ -1,4 +1,5 @@
 use std::iter::IntoIterator;
+use std::collections::HashSet;
 
 use usageparser::{UsageParser, UsageToken};
 
@@ -79,7 +80,7 @@ pub struct Arg<'n, 'l, 'h, 'g, 'p, 'r> {
     #[doc(hidden)]
     pub group: Option<&'g str>,
     #[doc(hidden)]
-    pub val_names: Option<Vec<&'p str>>,
+    pub val_names: Option<Vec<&'n str>>,
     #[doc(hidden)]
     pub num_vals: Option<u8>,
     #[doc(hidden)]
@@ -229,34 +230,57 @@ impl<'n, 'l, 'h, 'g, 'p, 'r> Arg<'n, 'l, 'h, 'g, 'p, 'r> {
          let mut required = false;
          let mut takes_value = false;
          let mut multiple = false;
+         let mut num_names = 1;
+         let mut name_first = false;
+         let mut consec_names = false;
+         let mut val_names = HashSet::new();
 
         let parser = UsageParser::with_usage(u);
         for_match!{ parser,
             UsageToken::Name(n, req) => {
-                if name.is_none() {
+                if consec_names {
+                    num_names += 1;
+                }
+                let mut use_req = false;
+                let mut use_name = false;
+                if name.is_none() && long.is_none() && short.is_none() {
+                    name_first = true;
+                    use_name = true;
+                    use_req = true;
+                } else if let Some(l) = long {
+                    if l == name.unwrap_or("") {
+                        if !name_first {
+                            use_name = true;
+                            use_req = true;
+                        }
+                    }
+                } else {
+                    // starting with short
+                    if !name_first {
+                        use_name = true;
+                        use_req = true;
+                    }
+                }
+                if use_name && !consec_names {
                     name = Some(n);
+                }
+                if use_req && !consec_names {
                     if let Some(r) = req {
                         required = r;
                     }
-                } else if let Some(l) = long {
-                    if l == name.unwrap() {
-                        if let Some(r) = req {
-                            required = r;
-                        }
-                        name = Some(n);
-                    } else if n != l {
-                        name = Some(n);
-                    }
-
                 }
                 if short.is_some() || long.is_some() {
+                    val_names.insert(n);
                     takes_value = true;
                 }
+                consec_names = true;
             },
             UsageToken::Short(s)     => {
+                consec_names = false;
                 short = Some(s);
             },
             UsageToken::Long(l)      => {
+                consec_names = false;
                 long = Some(l);
                 if name.is_none() {
                     name = Some(l);
@@ -270,6 +294,15 @@ impl<'n, 'l, 'h, 'g, 'p, 'r> Arg<'n, 'l, 'h, 'g, 'p, 'r> {
             }
         }
 
+        if let Some(l) = long {
+            val_names.remove(l);
+            if val_names.len() > 1 {
+                if name.unwrap() != l && !name_first {
+                    name = Some(l);
+                }
+            }
+        }
+
         Arg {
             name: name.unwrap(),
             short: short,
@@ -282,8 +315,8 @@ impl<'n, 'l, 'h, 'g, 'p, 'r> Arg<'n, 'l, 'h, 'g, 'p, 'r> {
             possible_vals: None,
             blacklist: None,
             requires: None,
-            num_vals: None,
+            num_vals: if num_names > 1 { Some(num_names) } else { None },
-            val_names: None,
+            val_names: if val_names.len() > 1 {Some(val_names.iter().map(|s| *s).collect::<Vec<_>>())}else{None},
             max_vals: None,
             min_vals: None,
             group: None,
@@ -765,8 +798,8 @@ impl<'n, 'l, 'h, 'g, 'p, 'r> Arg<'n, 'l, 'h, 'g, 'p, 'r> {
     /// # ).get_matches();
     pub fn value_names<T, I>(mut self, names: I)
                                  -> Arg<'n, 'l, 'h, 'g, 'p, 'r>
-                                 where T: AsRef<str> + 'p,
+                                 where T: AsRef<str> + 'n,
-                                       I: IntoIterator<Item=&'p T> {
+                                       I: IntoIterator<Item=&'n T> {
         if let Some(ref mut vec) = self.val_names {
             names.into_iter().map(|s| vec.push(s.as_ref())).collect::<Vec<_>>();
         } else {

src/lib.rs

@@ -361,6 +361,7 @@ mod usageparser;
 #[cfg(test)]
 mod tests {
     use super::{App, Arg, SubCommand};
+    use std::collections::HashSet;
 
     #[test]
 	fn create_app() {
@@ -394,6 +395,8 @@ mod tests {
         assert!(a.long.is_none());
         assert_eq!(a.help.unwrap(), "some help info");
         assert!(!a.multiple);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("[flag] --flag 'some help info'");
         assert_eq!(b.name, "flag");
@@ -401,6 +404,8 @@ mod tests {
         assert!(b.short.is_none());
         assert_eq!(b.help.unwrap(), "some help info");
         assert!(!b.multiple);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("--flag 'some help info'");
         assert_eq!(b.name, "flag");
@@ -408,6 +413,8 @@ mod tests {
         assert!(b.short.is_none());
         assert_eq!(b.help.unwrap(), "some help info");
         assert!(!b.multiple);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("[flag] -f --flag 'some help info'");
         assert_eq!(c.name, "flag");
@@ -415,6 +422,8 @@ mod tests {
         assert_eq!(c.long.unwrap(), "flag");
         assert_eq!(c.help.unwrap(), "some help info");
         assert!(!c.multiple);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("[flag] -f... 'some help info'");
         assert_eq!(d.name, "flag");
@@ -422,6 +431,8 @@ mod tests {
         assert!(d.long.is_none());
         assert_eq!(d.help.unwrap(), "some help info");
         assert!(d.multiple);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let e = Arg::from_usage("[flag] -f --flag... 'some help info'");
         assert_eq!(e.name, "flag");
@@ -429,6 +440,8 @@ mod tests {
         assert_eq!(e.short.unwrap(), 'f');
         assert_eq!(e.help.unwrap(), "some help info");
         assert!(e.multiple);
+        assert!(e.val_names.is_none());
+        assert!(e.num_vals.is_none());
 
         let e = Arg::from_usage("-f --flag... 'some help info'");
         assert_eq!(e.name, "flag");
@@ -436,24 +449,34 @@ mod tests {
         assert_eq!(e.short.unwrap(), 'f');
         assert_eq!(e.help.unwrap(), "some help info");
         assert!(e.multiple);
+        assert!(e.val_names.is_none());
+        assert!(e.num_vals.is_none());
 
         let e = Arg::from_usage("--flags");
         assert_eq!(e.name, "flags");
         assert_eq!(e.long.unwrap(), "flags");
+        assert!(e.val_names.is_none());
+        assert!(e.num_vals.is_none());
 
         let e = Arg::from_usage("--flags...");
         assert_eq!(e.name, "flags");
         assert_eq!(e.long.unwrap(), "flags");
         assert!(e.multiple);
+        assert!(e.val_names.is_none());
+        assert!(e.num_vals.is_none());
 
         let e = Arg::from_usage("[flags] -f");
         assert_eq!(e.name, "flags");
         assert_eq!(e.short.unwrap(), 'f');
+        assert!(e.val_names.is_none());
+        assert!(e.num_vals.is_none());
 
         let e = Arg::from_usage("[flags] -f...");
         assert_eq!(e.name, "flags");
         assert_eq!(e.short.unwrap(), 'f');
         assert!(e.multiple);
+        assert!(e.val_names.is_none());
+        assert!(e.num_vals.is_none());
     }
 
     #[test]
@@ -472,34 +495,46 @@ mod tests {
         assert_eq!(a.help.unwrap(), "some help info");
         assert!(!a.multiple);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("<pos> 'some help info'");
         assert_eq!(b.name, "pos");
         assert_eq!(b.help.unwrap(), "some help info");
         assert!(!b.multiple);
         assert!(b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("[pos]... 'some help info'");
         assert_eq!(c.name, "pos");
         assert_eq!(c.help.unwrap(), "some help info");
         assert!(c.multiple);
         assert!(!c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("<pos>... 'some help info'");
         assert_eq!(d.name, "pos");
         assert_eq!(d.help.unwrap(), "some help info");
         assert!(d.multiple);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let b = Arg::from_usage("<pos>");
         assert_eq!(b.name, "pos");
         assert!(!b.multiple);
         assert!(b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("[pos]...");
         assert_eq!(c.name, "pos");
         assert!(c.multiple);
         assert!(!c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
     }
 
     #[test]
@@ -509,24 +544,32 @@ mod tests {
         assert_eq!(a.help.unwrap(), "some help info");
         assert!(!a.multiple);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("<pos>\t'some help info'");
         assert_eq!(b.name, "pos");
         assert_eq!(b.help.unwrap(), "some help info");
         assert!(!b.multiple);
         assert!(b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("[pos]...\t'some help info'");
         assert_eq!(c.name, "pos");
         assert_eq!(c.help.unwrap(), "some help info");
         assert!(c.multiple);
         assert!(!c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("<pos>...\t'some help info'");
         assert_eq!(d.name, "pos");
         assert_eq!(d.help.unwrap(), "some help info");
         assert!(d.multiple);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
     }
 
     #[test]
@@ -551,6 +594,8 @@ mod tests {
         assert!(!a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("-o [opt] 'some help info'");
         assert_eq!(b.name, "opt");
@@ -560,6 +605,8 @@ mod tests {
         assert!(!b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> -o <opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -569,6 +616,8 @@ mod tests {
         assert!(!c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("-o <opt> 'some help info'");
         assert_eq!(d.name, "opt");
@@ -578,6 +627,8 @@ mod tests {
         assert!(!d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let a = Arg::from_usage("[option] -o [opt]... 'some help info'");
         assert_eq!(a.name, "option");
@@ -587,6 +638,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let a = Arg::from_usage("[option]... -o [opt] 'some help info'");
         assert_eq!(a.name, "option");
@@ -596,6 +649,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("-o [opt]... 'some help info'");
         assert_eq!(b.name, "opt");
@@ -605,6 +660,8 @@ mod tests {
         assert!(b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> -o <opt>... 'some help info'");
         assert_eq!(c.name, "option");
@@ -614,6 +671,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let c = Arg::from_usage("<option>... -o <opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -623,6 +682,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("-o <opt>... 'some help info'");
         assert_eq!(d.name, "opt");
@@ -632,6 +693,8 @@ mod tests {
         assert!(d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
 		// Long only
 
@@ -643,6 +706,8 @@ mod tests {
         assert!(!a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("--opt [option] 'some help info'");
         assert_eq!(b.name, "option");
@@ -652,6 +717,8 @@ mod tests {
         assert!(!b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> --opt <opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -661,6 +728,8 @@ mod tests {
         assert!(!c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("--opt <option> 'some help info'");
         assert_eq!(d.name, "option");
@@ -670,6 +739,8 @@ mod tests {
         assert!(!d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let a = Arg::from_usage("[option] --opt [opt]... 'some help info'");
         assert_eq!(a.name, "option");
@@ -679,6 +750,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let a = Arg::from_usage("[option]... --opt [opt] 'some help info'");
         assert_eq!(a.name, "option");
@@ -688,6 +761,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("--opt [option]... 'some help info'");
         assert_eq!(b.name, "option");
@@ -697,6 +772,8 @@ mod tests {
         assert!(b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> --opt <opt>... 'some help info'");
         assert_eq!(c.name, "option");
@@ -706,6 +783,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let c = Arg::from_usage("<option>... --opt <opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -715,6 +794,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("--opt <option>... 'some help info'");
         assert_eq!(d.name, "option");
@@ -724,6 +805,8 @@ mod tests {
         assert!(d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
 		// Long only with '='
 
@@ -735,6 +818,8 @@ mod tests {
         assert!(!a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("--opt=[option] 'some help info'");
         assert_eq!(b.name, "option");
@@ -744,6 +829,8 @@ mod tests {
         assert!(!b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> --opt=<opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -753,6 +840,8 @@ mod tests {
         assert!(!c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("--opt=<option> 'some help info'");
         assert_eq!(d.name, "option");
@@ -762,6 +851,8 @@ mod tests {
         assert!(!d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let a = Arg::from_usage("[option] --opt=[opt]... 'some help info'");
         assert_eq!(a.name, "option");
@@ -771,6 +862,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let a = Arg::from_usage("[option]... --opt=[opt] 'some help info'");
         assert_eq!(a.name, "option");
@@ -780,6 +873,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("--opt=[option]... 'some help info'");
         assert_eq!(b.name, "option");
@@ -789,6 +884,8 @@ mod tests {
         assert!(b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> --opt=<opt>... 'some help info'");
         assert_eq!(c.name, "option");
@@ -798,6 +895,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let c = Arg::from_usage("<option>... --opt=<opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -807,6 +906,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("--opt=<option>... 'some help info'");
         assert_eq!(d.name, "option");
@@ -816,6 +917,8 @@ mod tests {
         assert!(d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
 		// Long and Short
 
@@ -827,6 +930,8 @@ mod tests {
         assert!(!a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("-o --opt [option] 'some help info'");
         assert_eq!(b.name, "option");
@@ -836,6 +941,8 @@ mod tests {
         assert!(!b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> -o --opt <opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -845,6 +952,8 @@ mod tests {
         assert!(!c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("-o --opt <option> 'some help info'");
         assert_eq!(d.name, "option");
@@ -854,6 +963,8 @@ mod tests {
         assert!(!d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let a = Arg::from_usage("[option]... -o --opt [option] 'some help info'");
         assert_eq!(a.name, "option");
@@ -863,6 +974,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("-o --opt [option]... 'some help info'");
         assert_eq!(b.name, "option");
@@ -872,6 +985,8 @@ mod tests {
         assert!(b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option>... -o --opt <opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -881,6 +996,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("-o --opt <option>... 'some help info'");
         assert_eq!(d.name, "option");
@@ -890,6 +1007,8 @@ mod tests {
         assert!(d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
 		// Long and Short with '='
 
@@ -901,6 +1020,8 @@ mod tests {
         assert!(!a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("-o --opt=[option] 'some help info'");
         assert_eq!(b.name, "option");
@@ -910,6 +1031,8 @@ mod tests {
         assert!(!b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option> -o --opt=<opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -919,6 +1042,8 @@ mod tests {
         assert!(!c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("-o --opt=<option> 'some help info'");
         assert_eq!(d.name, "option");
@@ -928,6 +1053,8 @@ mod tests {
         assert!(!d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
 
         let a = Arg::from_usage("[option]... -o --opt=[option] 'some help info'");
         assert_eq!(a.name, "option");
@@ -937,6 +1064,8 @@ mod tests {
         assert!(a.multiple);
         assert!(a.takes_value);
         assert!(!a.required);
+        assert!(a.val_names.is_none());
+        assert!(a.num_vals.is_none());
 
         let b = Arg::from_usage("-o --opt=[option]... 'some help info'");
         assert_eq!(b.name, "option");
@@ -946,6 +1075,8 @@ mod tests {
         assert!(b.multiple);
         assert!(b.takes_value);
         assert!(!b.required);
+        assert!(b.val_names.is_none());
+        assert!(b.num_vals.is_none());
 
         let c = Arg::from_usage("<option>... -o --opt=<opt> 'some help info'");
         assert_eq!(c.name, "option");
@@ -955,6 +1086,8 @@ mod tests {
         assert!(c.multiple);
         assert!(c.takes_value);
         assert!(c.required);
+        assert!(c.val_names.is_none());
+        assert!(c.num_vals.is_none());
 
         let d = Arg::from_usage("-o --opt=<option>... 'some help info'");
         assert_eq!(d.name, "option");
@@ -964,6 +1097,73 @@ mod tests {
         assert!(d.multiple);
         assert!(d.takes_value);
         assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert!(d.num_vals.is_none());
+    }
+
+    #[test]
+    fn create_option_with_vals() {
+        let d = Arg::from_usage("-o <opt> <opt> 'some help info'");
+        assert_eq!(d.name, "opt");
+        assert!(d.long.is_none());
+        assert_eq!(d.short.unwrap(), 'o');
+        assert_eq!(d.help.unwrap(), "some help info");
+        assert!(!d.multiple);
+        assert!(d.takes_value);
+        assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert_eq!(d.num_vals.unwrap(), 2);
+
+        let d = Arg::from_usage("-o <opt> <opt>... 'some help info'");
+        assert_eq!(d.name, "opt");
+        assert!(d.long.is_none());
+        assert_eq!(d.short.unwrap(), 'o');
+        assert_eq!(d.help.unwrap(), "some help info");
+        assert!(d.multiple);
+        assert!(d.takes_value);
+        assert!(d.required);
+        assert!(d.val_names.is_none());
+        assert_eq!(d.num_vals.unwrap(), 2);
+
+        let d = Arg::from_usage("--opt <file> <mode>... 'some help info'");
+        assert_eq!(d.name, "opt");
+        assert!(d.short.is_none());
+        assert_eq!(d.long.unwrap(), "opt");
+        assert_eq!(d.help.unwrap(), "some help info");
+        assert!(d.multiple);
+        assert!(d.takes_value);
+        assert!(d.required);
+        let mut v = d.val_names.unwrap().into_iter().collect::<HashSet<_>>();
+        for name in &["mode", "file"] {
+            assert!(v.remove(name));
+        }
+        assert!(v.is_empty());
+        assert_eq!(d.num_vals.unwrap(), 2);
+
+        let d = Arg::from_usage("[myopt] --opt <file> <mode> 'some help info'");
+        assert_eq!(d.name, "myopt");
+        assert!(d.short.is_none());
+        assert_eq!(d.long.unwrap(), "opt");
+        assert_eq!(d.help.unwrap(), "some help info");
+        assert!(!d.multiple);
+        assert!(d.takes_value);
+        assert!(!d.required);
+        let mut v = d.val_names.unwrap().into_iter().collect::<HashSet<_>>();
+        for name in &["mode", "file"] {
+            assert!(v.remove(name));
+        }
+        assert!(v.is_empty());
+        assert_eq!(d.num_vals.unwrap(), 2);
+
+        let d = Arg::from_usage("--opt <option> <option> 'some help info'");
+        assert_eq!(d.name, "option");
+        assert!(d.short.is_none());
+        assert_eq!(d.long.unwrap(), "opt");
+        assert_eq!(d.help.unwrap(), "some help info");
+        assert!(!d.multiple);
+        assert!(d.takes_value);
+        assert!(d.required);
+        assert_eq!(d.num_vals.unwrap(), 2);
     }
 
     #[test]