Add a codegen crate for generating an “Recent Updates” section

codegen/.gitignore

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+target

codegen/Cargo.toml

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+[package]
+authors = ["Philipp Oppermann <dev@phil-opp.com>"]
+name = "codegen"
+version = "0.1.0"
+
+[dependencies]
+chrono = "0.2.25"
+getopts = "0.2.14"
+requests = "0.0.22"

codegen/src/main.rs

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+extern crate requests;
+extern crate getopts;
+extern crate chrono;
+
+use chrono::Duration;
+use std::fmt;
+
+fn main() {
+    use std::env;
+    use std::fs::File;
+    use std::io::Write;
+
+    let args: Vec<String> = env::args().collect();
+    let mut opts = getopts::Options::new();
+
+    opts.optopt("o", "", "set output file name", "NAME");
+    let matches = opts.parse(&args[1..]).unwrap();
+    let output = matches.opt_str("o");
+
+    let pr_list = pr_list();
+
+    match output {
+        None => println!("{:?}", pr_list),
+        Some(output) => {
+            let mut file = File::create(output).expect("error while opening/creating output file");
+            file.write_all(pr_list.as_bytes()).expect("error while writing to output file");
+        }
+    }
+}
+
+fn pr_list() -> String {
+    use chrono::{UTC, DateTime};
+
+    const URL: &'static str = "https://api.github.com/search/issues?q=repo:phil-opp/blog_os+type:\
+                               pr+is:merged+label:relnotes";
+
+    let mut ret = String::from("<ul>");
+
+    let res = requests::get(URL).expect("Error while querying GitHub API");
+    let data = res.json().expect("Error parsing JSON");
+
+    for pr in data["items"].members().take(5) {
+        let now = UTC::now();
+        let merged_at = pr["closed_at"].as_str().unwrap().parse::<DateTime<UTC>>().unwrap();
+        let ago = now - merged_at;
+
+        let item = format!(r#"<li><a href="{}">{}</a> {}"#,
+                           pr["html_url"],
+                           pr["title"],
+                           DateFmt(ago));
+        ret.push_str(&item);
+    }
+
+    ret.push_str("</ul>");
+    ret
+}
+
+struct DateFmt(Duration);
+
+impl fmt::Display for DateFmt {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        try!(write!(f, r#"<time datetime="{}">"#, self.0));
+
+        try!(if self.0.num_minutes() == 1 {
+            write!(f, "1 minute ago")
+        } else if self.0.num_minutes() < 60 {
+            write!(f, "{} minutes ago", self.0.num_minutes())
+        } else if self.0.num_hours() == 1 {
+            write!(f, "1 hour ago")
+        } else if self.0.num_hours() < 24 {
+            write!(f, "{} hours ago", self.0.num_hours())
+        } else if self.0.num_days() == 1 {
+            write!(f, "1 day ago")
+        } else if self.0.num_days() < 7 {
+            write!(f, "{} days ago", self.0.num_days())
+        } else if self.0.num_weeks() == 1 {
+            write!(f, "1 week ago")
+        } else if self.0.num_weeks() < 4 {
+            write!(f, "{} weeks ago", self.0.num_weeks())
+        } else if self.0.num_weeks() == 4 {
+            write!(f, "1 month ago")
+        } else if self.0.num_days() < 365 {
+            write!(f, "{} months ago", self.0.num_days() / 30)
+        } else if self.0.num_days() < 365 * 2 {
+            write!(f, "1 year ago")
+        } else {
+            write!(f, "{} years ago", self.0.num_days() / 365)
+        });
+
+        write!(f, "</datetime>")
+    }
+}