Add support for supplying multiple templates to the dustjs shim to support testing partials.

src/bin.rs

@@ -1,9 +1,24 @@
 extern crate nom;
+
 use parser::template;
+use std::io::{self, Read};
 
 mod parser;
 
 fn main() {
-    let parsed_template = template("{#foo.bar}hello {name}{/foo.bar}!");
-    println!("{:?}", parsed_template);
+    let context = read_context_from_stdin();
+    println!("{:?}", context);
+}
+
+fn read_context_from_stdin() -> serde_json::map::Map<String, serde_json::Value> {
+    let mut buffer = String::new();
+    io::stdin()
+        .read_to_string(&mut buffer)
+        .expect("Failed to read stdin");
+
+    let parsed: serde_json::Value = serde_json::from_str(&buffer).expect("Failed to parse json");
+    match parsed {
+        serde_json::Value::Object(obj) => obj,
+        _ => panic!("Expected context to be an object"),
+    }
 }