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, 93 insertions, 0 deletions

diff --git a/clap/examples/01b_quick_example.rs b/clap/examples/01b_quick_example.rs
new file mode 100644
index 0000000..7f455a8
--- /dev/null
+++ b/clap/examples/01b_quick_example.rs
@@ -0,0 +1,93 @@
+extern crate clap;
+
+use clap::{App, Arg, SubCommand};
+
+fn main() {
+
+    // This method shows the traditional, and slightly more configurable way to set up arguments. This method is
+    // more verbose, but allows setting more configuration options, and even supports easier dynamic generation.
+    //
+    // The example below is functionally identical to the 01a_quick_example.rs and 01c_quick_example.rs
+    //
+    // *NOTE:* You can actually achieve the best of both worlds by using Arg::from_usage() (instead of Arg::with_name())
+    // and *then* setting any additional properties.
+    //
+    // Create an application with 5 possible arguments (2 auto generated) and 2 subcommands (1 auto generated)
+    //    - A config file
+    //        + Uses "-c filename" or "--config filename"
+    //    - An output file
+    //        + A positional argument (i.e. "$ myapp output_filename")
+    //    - A debug flag
+    //        + Uses "-d" or "--debug"
+    //        + Allows multiple occurrences of such as "-dd" (for vary levels of debugging, as an example)
+    //    - A help flag (automatically generated by clap)
+    //        + Uses "-h" or "--help" (Only autogenerated if you do NOT specify your own "-h" or "--help")
+    //    - A version flag (automatically generated by clap)
+    //        + Uses "-V" or "--version" (Only autogenerated if you do NOT specify your own "-V" or "--version")
+    //    - A subcommand "test" (subcommands behave like their own apps, with their own arguments
+    //        + Used by "$ myapp test" with the following arguments
+    //            > A list flag
+    //                = Uses "-l" (usage is "$ myapp test -l"
+    //            > A help flag (automatically generated by clap
+    //                = Uses "-h" or "--help" (full usage "$ myapp test -h" or "$ myapp test --help")
+    //            > A version flag (automatically generated by clap
+    //                = Uses "-V" or "--version" (full usage "$ myapp test -V" or "$ myapp test --version")
+    //    - A subcommand "help" (automatically generated by clap because we specified a subcommand of our own)
+    //        + Used by "$ myapp help" (same functionality as "-h" or "--help")
+    let matches = App::new("MyApp")
+                        .version("1.0")
+                        .author("Kevin K. <kbknapp@gmail.com>")
+                        .about("Does awesome things")
+                        .arg(Arg::with_name("config")
+                                    .short("c")
+                                    .long("config")
+                                    .value_name("FILE")
+                                    .help("Sets a custom config file")
+                                    .takes_value(true))
+                        .arg(Arg::with_name("output")
+                                    .help("Sets an optional output file")
+                                    .index(1))
+                        .arg(Arg::with_name("debug")
+                                    .short("d")
+                                    .multiple(true)
+                                    .help("Turn debugging information on"))
+                        .subcommand(SubCommand::with_name("test")
+                                                .about("does testing things")
+                                                .arg(Arg::with_name("list")
+                                                    .short("l")
+                                                    .help("lists test values")))
+                        .get_matches();
+
+    // You can check the value provided by positional arguments, or option arguments
+    if let Some(o) = matches.value_of("output") {
+        println!("Value for output: {}", o);
+    }
+
+    if let Some(c) = matches.value_of("config") {
+        println!("Value for config: {}", c);
+    }
+
+    // You can see how many times a particular flag or argument occurred
+    // Note, only flags can have multiple occurrences
+    match matches.occurrences_of("debug") {
+        0 => println!("Debug mode is off"),
+        1 => println!("Debug mode is kind of on"),
+        2 => println!("Debug mode is on"),
+        3 | _ => println!("Don't be crazy"),
+     }
+
+    // You can check for the existence of subcommands, and if found use their
+    // matches just as you would the top level app
+    if let Some(matches) = matches.subcommand_matches("test") {
+        // "$ myapp test" was run
+        if matches.is_present("list") {
+            // "$ myapp test -l" was run
+            println!("Printing testing lists...");
+        } else {
+            println!("Not printing testing lists...");
+        }
+    }
+
+
+    // Continued program logic goes here...
+}