Support -L modules

Signed-off-by: clux <sszynrae@gmail.com>

README.md

@@ -22,7 +22,7 @@ cargo binstall whyq
 
 ## Features
 
-- arbitrary `jq` usage on yaml/toml/json input with the same syntax (args passed along to `jq` with json converted input)
+- arbitrary `jq` usage on yaml/toml/json input with the same syntax (same filter syntax, supports modules) by leveraging `jq` as an intermediate format
 - drop-in replacement to [python-yq](https://kislyuk.github.io/yq/) (e.g. provides: yq)
 - handles multidoc **yaml** input (vector of documents returned when multiple docs found)
 - handles [yaml merge keys](https://yaml.org/type/merge.html) and expands yaml tags (via `serde_yaml`)
@@ -121,6 +121,17 @@ Escaping keys with slashes etc in them:
 yq -y '.updates[] | select(.["package-ecosystem"] == "cargo") | .groups' .github/dependabot.yml
 ```
 
+Using helpers from `jq` [modules](https://jqlang.github.io/jq/manual/):
+
+```sh
+$ yq 'include "k"; .[] | gvk' -r -L$PWD/test/modules < test/deploy.yaml
+v1.ServiceAccount
+rbac.authorization.k8s.io/v1.ClusterRole
+rbac.authorization.k8s.io/v1.ClusterRoleBinding
+v1.Service
+apps/v1.Deployment
+```
+
 ## Output Caveats
 
 Output formatting such as `-y` for YAML or `-t` for TOML will require the output from `jq` to be parseable json.

test/modules/k.jq

@@ -0,0 +1,7 @@
+module {
+  "name": "k"
+};
+
+def gvk:
+  "\(.apiVersion).\(.kind)"
+;

test/yq.test.bats

@@ -82,3 +82,8 @@
   run yq --input=json ".ingredients | keys" -c < test/guacamole.json
   echo "$output" && echo "$output" | grep '["avocado","coriander","cumin","garlic","lime","onions","pepper","salt","tomatoes"]'
 }
+
+@test "jq_modules" {
+  run yq 'include "k"; . | gvk' -r -L$PWD/test/modules < test/grafana.yaml
+  echo "$output" && echo "$output" | grep 'apps/v1.Deployment'
+}

yq.rs

@@ -97,6 +97,10 @@ struct Args {
     /// that the jq -r output is deserializable into the desired output format.
     #[arg(short = 'j', long, default_value = "false")]
     join_output: bool,
+
+    /// Search jq modules from the directory
+    #[arg(short = 'L', default_value = "None")]
+    modules: Option<PathBuf>,
 }
 
 impl Args {
@@ -111,6 +115,10 @@ impl Args {
         if self.join_output {
             args.push("-j".into());
         }
+        if let Some(dir) = &self.modules {
+            args.push("-L".into());
+            args.push(format!("{}", dir.display()));
+        }
         args
     }