Special characters must be quoted in the query

Closes #21

README.md

@@ -77,6 +77,25 @@ The CloudFormation YAML schema is supported. The input file can contain the Clou
 - `!Split`
 - `!Sub`
 
+## Possible Issues
+
+### Quoting Special Characters
+
+Keys with hyphens and other special characters should be quoted in the query. For example, given an input file like this:
+```yaml
+foo-bar: baz
+```
+
+Then use a step definition like this:
+```yaml
+uses: CumulusDS/get-yaml-paths-action@v0.2.0
+with:
+  file: file.yml
+  foobar: '"foo-bar"'
+```
+
+The query should be `"foo-bar"` to get the value of the `foo-bar` key. Without the quotes, the query would be interpreted as a numerical subtraction, which would result in an error.
+
 # See Also
 
 [get-json-paths-action](https://github.com/gr2m/get-json-paths-action)

env/test.yml

@@ -5,3 +5,4 @@ provider:
 qux:
   - bar: hello
   - bar: world
+foo-bar: 7

src/main.js

@@ -15,6 +15,7 @@ export default async function main() {
       core.setOutput(name, value);
     }
   } catch (error) {
+    console.log(error);
     core.setFailed(error.message);
     process.exit(1);
   }

test/unit/main.test.js

@@ -16,13 +16,15 @@ describe("main", () => {
       INPUT_B: "provider.stage",
       NOT_INPUT_C: "c",
       INPUT_D: "qux[].bar",
-      INPUT_E: "foo"
+      INPUT_E: "foo",
+      INPUT_F: '"foo-bar"'
     };
     await main();
     expect(core.setOutput).toHaveBeenCalledWith("a", "baz");
     expect(core.setOutput).toHaveBeenCalledWith("b", "green");
     expect(core.setOutput).toHaveBeenCalledWith("d", '["hello","world"]');
     expect(core.setOutput).toHaveBeenCalledWith("e", '{"bar":"baz"}');
+    expect(core.setOutput).toHaveBeenCalledWith("f", 7);
   });
 
   it("calls setFailed when unsuccessful", async () => {

test/unit/readYaml.test.js

@@ -9,6 +9,7 @@ describe("readYaml", () => {
         "foo": Object {
           "bar": "baz",
         },
+        "foo-bar": 7,
         "provider": Object {
           "stage": "green",
         },