Add structopt dependency in version 0.3.7

This patch series replaces argparse with structopt in the argument
handling code. As a first step, we need structopt as a dependency.

Import subrepo structopt/:structopt at efbdda4753592e27bc430fb01f7b9650b2f3174d
Import subrepo bitflags/:bitflags at 30668016aca6bd3b02c766e8347e0b4080d4c296
Import subrepo clap/:clap at 784524f7eb193e35f81082cc69454c8c21b948f7
Import subrepo heck/:heck at 093d56fbf001e1506e56dbfa38631d99b1066df1
Import subrepo proc-macro-error/:proc-macro-error at 6c4cfe79a622c5de8ae68557993542be46eacae2
Import subrepo proc-macro2/:proc-macro2 at d5d48eddca4566e5438e8a2cbed4a74e049544de
Import subrepo quote/:quote at 727436c6c137b20f0f34dde5d8fda2679b9747ad
Import subrepo rustversion/:rustversion at 0c5663313516263059ce9059ef81fc7a1cf655ca
Import subrepo syn-mid/:syn-mid at 5d3d85414a9e6674e1857ec22a87b96e04a6851a
Import subrepo syn/:syn at e87c27e87f6f4ef8919d0372bdb056d53ef0d8f3
Import subrepo textwrap/:textwrap at abcd618beae3f74841032aa5b53c1086b0a57ca2
Import subrepo unicode-segmentation/:unicode-segmentation at 637c9874c4fe0c205ff27787faf150a40295c6c3
Import subrepo unicode-width/:unicode-width at 3033826f8bf05e82724140a981d5941e48fce393
Import subrepo unicode-xid/:unicode-xid at 4baae9fffb156ba229665b972a9cd5991787ceb7

1 files changed, 66 insertions, 0 deletions

diff --git a/clap/src/args/subcommand.rs b/clap/src/args/subcommand.rs
new file mode 100644
index 0000000..eebbf82
--- /dev/null
+++ b/clap/src/args/subcommand.rs
@@ -0,0 +1,66 @@
+// Third Party
+#[cfg(feature = "yaml")]
+use yaml_rust::Yaml;
+
+// Internal
+use App;
+use ArgMatches;
+
+/// The abstract representation of a command line subcommand.
+///
+/// This struct describes all the valid options of the subcommand for the program. Subcommands are
+/// essentially "sub-[`App`]s" and contain all the same possibilities (such as their own
+/// [arguments], subcommands, and settings).
+///
+/// # Examples
+///
+/// ```rust
+/// # use clap::{App, Arg, SubCommand};
+/// App::new("myprog")
+///     .subcommand(
+///         SubCommand::with_name("config")
+///             .about("Used for configuration")
+///             .arg(Arg::with_name("config_file")
+///                 .help("The configuration file to use")
+///                 .index(1)))
+/// # ;
+/// ```
+/// [`App`]: ./struct.App.html
+/// [arguments]: ./struct.Arg.html
+#[derive(Debug, Clone)]
+pub struct SubCommand<'a> {
+    #[doc(hidden)] pub name: String,
+    #[doc(hidden)] pub matches: ArgMatches<'a>,
+}
+
+impl<'a> SubCommand<'a> {
+    /// Creates a new instance of a subcommand requiring a name. The name will be displayed
+    /// to the user when they print version or help and usage information.
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// # use clap::{App, Arg, SubCommand};
+    /// App::new("myprog")
+    ///     .subcommand(
+    ///         SubCommand::with_name("config"))
+    /// # ;
+    /// ```
+    pub fn with_name<'b>(name: &str) -> App<'a, 'b> { App::new(name) }
+
+    /// Creates a new instance of a subcommand from a YAML (.yml) document
+    ///
+    /// # Examples
+    ///
+    /// ```ignore
+    /// # #[macro_use]
+    /// # extern crate clap;
+    /// # use clap::Subcommand;
+    /// # fn main() {
+    /// let sc_yaml = load_yaml!("test_subcommand.yml");
+    /// let sc = SubCommand::from_yaml(sc_yaml);
+    /// # }
+    /// ```
+    #[cfg(feature = "yaml")]
+    pub fn from_yaml(yaml: &Yaml) -> App { App::from_yaml(yaml) }
+}