Redirect to rustdoc when user is feeling lucky

This is a super dirty patch to check if a crate have rustdocs generated.
This only occurs if user uses feeling lucky button. It is now redirecting to
documentation instead of crate page.

Closes: #163

Author: onur

src/web/releases.rs

@@ -456,12 +456,37 @@ pub fn search_handler(req: &mut Request) -> IronResult<Response> {
 
 
             if let Some(version) = match_version(&conn, &query, None) {
-                let url = ctry!(Url::parse(&format!("{}://{}:{}/crate/{}/{}",
+                // FIXME: This is a super dirty way to check if crate have rustdocs generated.
+                //        match_version should handle this instead of this code block.
+                //        This block is introduced to fix #163
+                let rustdoc_status = {
+                    let rows = ctry!(conn.query("SELECT rustdoc_status
+                                                 FROM releases
+                                                 INNER JOIN crates
+                                                 ON crates.id = releases.crate_id
+                                                 WHERE crates.name = $1 AND releases.version = $2",
+                                                &[query, &version]));
+                    if rows.is_empty() {
+                        false
+                    } else {
+                        rows.get(0).get(0)
+                    }
+                };
+                let url = if rustdoc_status {
+                    ctry!(Url::parse(&format!("{}://{}:{}/{}/{}",
                                               req.url.scheme(),
                                               req.url.host(),
                                               req.url.port(),
                                               query,
-                                              version)[..]));
+                                              version)[..]))
+                } else {
+                    ctry!(Url::parse(&format!("{}://{}:{}/crate/{}/{}",
+                                              req.url.scheme(),
+                                              req.url.host(),
+                                              req.url.port(),
+                                              query,
+                                              version)[..]))
+                };
                 let mut resp = Response::with((status::Found, Redirect(url)));
 
                 use iron::headers::{Expires, HttpDate};