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, 56 insertions, 0 deletions

diff --git a/clap/examples/05_flag_args.rs b/clap/examples/05_flag_args.rs
new file mode 100644
index 0000000..a6b8945
--- /dev/null
+++ b/clap/examples/05_flag_args.rs
@@ -0,0 +1,56 @@
+extern crate clap;
+
+use clap::{App, Arg};
+
+fn main() {
+
+    // Of the three argument types, flags are the most simple. Flags are simple switches which can
+    // be either "on" or "off"
+    //
+    // clap also supports multiple occurrences of flags, the common example is "verbosity" where a
+    // user could want a little information with "-v" or tons of information with "-v -v" or "-vv"
+    let matches = App::new("MyApp")
+                        // Regular App configuration goes here...
+
+                        // We'll add a flag that represents an awesome meter...
+                        //
+                        // I'll explain each possible setting that "flags" accept. Keep in mind
+                        // that you DO NOT need to set each of these for every flag, only the ones
+                        // you want for your individual case.
+                        .arg(Arg::with_name("awesome")
+                                    .help("turns up the awesome") // Displayed when showing help info
+                                    .short("a")                   // Trigger this arg with "-a"
+                                    .long("awesome")              // Trigger this arg with "--awesome"
+                                    .multiple(true)               // This flag should allow multiple
+                                                                  // occurrences such as "-aaa" or "-a -a"
+                                    .requires("config")           // Says, "If the user uses -a, they MUST
+                                                                  // also use this other 'config' arg too"
+                                                                  // Can also specify a list using
+                                                                  // requires_all(Vec<&str>)
+                                    .conflicts_with("output")     // Opposite of requires(), says "if the
+                                                                  // user uses -a, they CANNOT use 'output'"
+                                                                  // also has a conflicts_with_all(Vec<&str>)
+                        )
+                        // NOTE: In order to compile this example, comment out requires() and
+                        // conflicts_with() because we have not defined an "output" or "config"
+                        // argument.
+                        .get_matches();
+
+    // We can find out whether or not awesome was used
+    if matches.is_present("awesome") {
+        println!("Awesomeness is turned on");
+    }
+
+    // If we set the multiple() option of a flag we can check how many times the user specified
+    //
+    // Note: if we did not specify the multiple() option, and the user used "awesome" we would get
+    // a 1 (no matter how many times they actually used it), or a 0 if they didn't use it at all
+    match matches.occurrences_of("awesome") {
+        0 => println!("Nothing is awesome"),
+        1 => println!("Some things are awesome"),
+        2 => println!("Lots of things are awesome"),
+        3 | _ => println!("EVERYTHING is awesome!"),
+    }
+
+    // Continued program logic goes here...
+}