main(): Add command line options

Add options for:

* Jenkins URL
* Jenkins username
* Jenkins token
* GitHub token
* Port

Add a help option for usage information. All options except "port" are
required. Didn't use `reqopt` because that panics when you try to ask
for help without the required options. Now, when trying to run without a
required option, the usage help is printed. Maybe we should have an
error message instead.

1 files changed, 73 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 5882909..e9b7cc7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,19 +1,92 @@
+extern crate getopts;
 #[macro_use]
 extern crate rouille;
 
 extern crate kipper;
 
+use std::env;
 use std::io::Read;
 
+use getopts::Options;
+
 use kipper::jenkins;
 use kipper::pull_request::CommitRef;
 
+const DEFAULT_PORT: u16 = 8000;
+
+fn print_usage(opts: Options) {
+    let brief = "Usage: kipper --jenkins-url 'https://jenkins.example.com' --jenkins-user-id username --jenkins-token a72a57d448694703b2c3fd19e666ecc5 --github-token 1dc41fad0516460b870014b25b11847d";
+    print!("{}", opts.usage(&brief));
+}
+
 fn internal_server_error() -> rouille::Response {
     rouille::Response::text("500 Internal Server Error")
         .with_status_code(500)
 }
 
 fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    let mut opts = Options::new();
+    opts.optopt("", "jenkins-url", "Jenkins URL (required)", "https://jenkins.example.com");
+    opts.optopt("", "jenkins-user-id", "Jenkins user ID (required)", "USER_ID");
+    opts.optopt("", "jenkins-token", "Jenkins API token (required)", "TOKEN");
+    opts.optopt(
+        "",
+        "github-token",
+        "GitHub API token with \"repo:status\" permission (required)",
+        "TOKEN"
+    );
+    opts.optopt("p", "port", "set port number", "PORT");
+    opts.optflag("h", "help", "print this help menu");
+
+    let opt_matches = match opts.parse(&args[1..]) {
+        Ok(m) => m,
+        Err(e) => panic!(e.to_string()),
+    };
+
+    if opt_matches.opt_present("h") {
+        print_usage(opts);
+        return;
+    }
+
+    let jenkins_url = match opt_matches.opt_str("jenkins-url") {
+        Some(url) => url,
+        None => {
+            print_usage(opts);
+            return;
+        },
+    };
+
+    let jenkins_user_id = match opt_matches.opt_str("jenkins-user-id") {
+        Some(user_id) => user_id,
+        None => {
+            print_usage(opts);
+            return;
+        },
+    };
+
+    let jenkins_token = match opt_matches.opt_str("jenkins-token") {
+        Some(token) => token,
+        None => {
+            print_usage(opts);
+            return;
+        },
+    };
+
+    let github_token = match opt_matches.opt_str("github-token") {
+        Some(token) => token,
+        None => {
+            print_usage(opts);
+            return;
+        },
+    };
+
+    let port = match opt_matches.opt_str("p") {
+        Some(p) => p.parse().expect("Unable to parse specified port"),
+        None => DEFAULT_PORT,
+    };
+
     rouille::start_server("localhost:8000", move |request| {
         router!(request,
             (POST) (/github/pull_request_event) => {