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, 75 insertions, 0 deletions

diff --git a/clap/examples/01c_quick_example.rs b/clap/examples/01c_quick_example.rs
new file mode 100644
index 0000000..071bdc0
--- /dev/null
+++ b/clap/examples/01c_quick_example.rs
@@ -0,0 +1,75 @@
+#[macro_use]
+extern crate clap;
+
+fn main() {
+    // This example shows how to create an application with several arguments using macro builder.
+    // It combines the simplicity of the from_usage methods and the performance of the Builder Pattern.
+    //
+    // The example below is functionally identical to the one in 01a_quick_example.rs and 01b_quick_example.rs
+    //
+    // 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 = clap_app!(myapp =>
+        (version: "1.0")
+        (author: "Kevin K. <kbknapp@gmail.com>")
+        (about: "Does awesome things")
+        (@arg CONFIG: -c --config +takes_value "Sets a custom config file")
+        (@arg INPUT: +required "Sets the input file to use")
+        (@arg debug: -d ... "Sets the level of debugging information")
+        (@subcommand test =>
+            (about: "controls testing features")
+            (version: "1.3")
+            (author: "Someone E. <someone_else@other.com>")
+            (@arg verbose: -v --verbose "Print test information verbosely")
+        )
+    ).get_matches();
+
+    // Calling .unwrap() is safe here because "INPUT" is required (if "INPUT" wasn't
+    // required we could have used an 'if let' to conditionally get the value)
+    println!("Using input file: {}", matches.value_of("INPUT").unwrap());
+
+    // Gets a value for config if supplied by user, or defaults to "default.conf"
+    let config = matches.value_of("CONFIG").unwrap_or("default.conf");
+    println!("Value for config: {}", config);
+
+    // Vary the output based on how many times the user used the "debug" flag
+    // (i.e. 'myapp -d -d -d' or 'myapp -ddd' vs 'myapp -d'
+    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 information about subcommands by requesting their matches by name
+    // (as below), requesting just the name used, or both at the same time
+    if let Some(matches) = matches.subcommand_matches("test") {
+        if matches.is_present("verbose") {
+            println!("Printing verbosely...");
+        } else {
+            println!("Printing normally...");
+        }
+    }
+
+    // more program logic goes here...
+}