Add the from method to parse from any Iterator

CHANGELOG.md

@@ -42,6 +42,7 @@ You have to change `foo_raw = "bar", baz_raw = "foo"` by `raw(foo = "bar", baz =
 * Add `parse(from_occurrences)` parser by [@SergioBenitez](https://github.com/SergioBenitez)
 * Support 1-uple enum variant as subcommand by [@TeXitoi](https://github.com/TeXitoi)
 * structopt-derive crate is now an implementation detail, structopt reexport the custom derive macro by [@TeXitoi](https://github.com/TeXitoi)
+* Add the `StructOpt::from_any` method by [@Kerollmops](https://github.com/Kerollmops)
 
 ## Documentation
 

src/lib.rs

@@ -346,6 +346,8 @@ extern crate structopt_derive;
 #[doc(hidden)]
 pub use structopt_derive::*;
 
+use std::ffi::OsString;
+
 /// Re-export of clap
 pub mod clap {
     pub use _clap::*;
@@ -365,4 +367,15 @@ pub trait StructOpt {
     fn from_args() -> Self where Self: Sized {
         Self::from_clap(&Self::clap().get_matches())
     }
+
+    /// Gets the struct from any iterator such as a `Vec` of your making.
+    /// Print the error message and quit the program in case of failure.
+    fn from_any<I>(iter: I) -> Self
+    where
+        Self: Sized,
+        I: IntoIterator,
+        I::Item: Into<OsString> + Clone
+    {
+        Self::from_clap(&Self::clap().get_matches_from(iter))
+    }
 }