Create a new crate for the query parser. Fixes #138. r=rnewman

Starting to work out the project layout for sub-crates.  The crate inside query-parser/ is "datomish-query-parser" and the core code in src/ depends on it.

.travis.yml

@@ -2,5 +2,5 @@ language: rust
 script:
   - cargo build --verbose
   - cargo test --verbose
-  - cargo build --verbose -p datomish-cli
+  - cargo test --verbose -p datomish-query-parser
   - cargo test --verbose -p datomish-cli

Cargo.toml

@@ -4,6 +4,8 @@ version = "0.4.0"
 authors = ["Richard Newman <rnewman@twinql.com>", "Nicholas Alexander <nalexander@mozilla.com>"]
 
 [dependencies]
+[dependencies.datomish-query-parser]
+  path = "query-parser"
 
 [dev-dependencies]
 [dev-dependencies.datomish-cli]

query-parser/Cargo.toml

@@ -0,0 +1,3 @@
+[package]
+name = "datomish-query-parser"
+version = "0.0.1"

query-parser/src/lib.rs

@@ -0,0 +1,24 @@
+// Copyright 2016 Mozilla
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+// this file except in compliance with the License. You may obtain a copy of the
+// License at http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software distributed
+// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+// CONDITIONS OF ANY KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations under the License.
+
+// This file is just a stub
+pub fn get_name() -> String {
+  return String::from("datomish-query-parser");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        assert_eq!(String::from("datomish-query-parser"), get_name());
+    }
+}

src/lib.rs

@@ -8,11 +8,17 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the
 // specific language governing permissions and limitations under the License.
 
+extern crate datomish_query_parser;
 
 pub fn get_name() -> String {
   return String::from("datomish");
 }
 
+// Just an example of using a dependency
+pub fn get_parser_name() -> String {
+  return datomish_query_parser::get_name();
+}
+
 pub fn add_two(a: i32) -> i32 {
     a + 2
 }
@@ -25,4 +31,9 @@ mod tests {
     fn it_works() {
         assert_eq!(4, add_two(2));
     }
+
+    #[test]
+    fn can_import_parser() {
+        assert_eq!(String::from("datomish-query-parser"), get_parser_name());
+    }
 }