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Cargo.toml

 comrak = "0.3"
 fs_extra = "1.1.0"
 lazy_static = "1.2.0"
+notify = "4.0.0"
 regex = "1"
 toml = "0.4.8"
 uuid = { version = "0.7", features = ["v4"] }

README.md

+# Tlon
+
+Tlon is a static site generator written in Rust. I had very specific goals in mind when writing Tlon and it is not meant to be all things for all people. Tlon does what it is intended to do and no more.
+
+Goals
+- Convention over configuration
+- Learn Rust
+- Fast compile times
+
+Non-goals
+- Extensibility
+- Flexibility

src/commands.rs

+use std::sync::mpsc::channel;
+use std::time::Duration;
 use std::{env, fs};
 
 use fs_extra::dir;
+use notify::{RecommendedWatcher, RecursiveMode, Watcher};
 use toml::Value;
 
 use config::Config;
     }
 }
 
+pub fn watch() -> notify::Result<()> {
+    let cwd = env::current_dir().expect("Couldn't read current directory");
+    let (tx, rx) = channel();
+    let mut watcher: RecommendedWatcher = try!(Watcher::new(tx, Duration::from_secs(2)));
+    try!(watcher.watch(&cwd.join("posts"), RecursiveMode::Recursive));
+    println!("Watching {}/posts", cwd.to_str().unwrap());
+    loop {
+        match rx.recv() {
+            Ok(_) => {
+                build();
+            }
+            Err(e) => println!("watch error: {:?}", e),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     #[allow(unused_imports)]

src/main.rs

 extern crate fs_extra;
 #[macro_use]
 extern crate lazy_static;
+extern crate notify;
 extern crate regex;
 extern crate toml;
 extern crate uuid;
 
 use clap::{App, Arg};
 
-use commands::{build, new};
+use commands::{build, new, watch};
 
 mod commands;
 mod config;
         .arg(
             Arg::with_name("command")
                 .required(true)
-                .possible_values(&["build", "new"])
+                .possible_values(&["build", "new", "watch"])
                 .index(1),
         ).arg(
             Arg::with_name("name")
         build();
     } else if command == "new" {
         new(&matches.value_of("name").unwrap());
+    } else if command == "watch" {
+        build();
+        watch().expect("Error while watching posts directory");
     }
 }