Add rule indentifying empty hooks

rule-tests/__snapshots__/empty-hook-inline-snapshot.yml

@@ -0,0 +1,13 @@
+id: empty-hook-inline
+snapshots:
+  'type X = unit { x: uint8 {} };':
+    fixed: 'type X = unit { x: uint8 ; };'
+    labels:
+    - source: '{}'
+      style: primary
+      start: 25
+      end: 27
+    - source: 'x: uint8 {}'
+      style: secondary
+      start: 16
+      end: 27

rule-tests/__snapshots__/empty-hook-snapshot.yml

@@ -0,0 +1,17 @@
+id: empty-hook
+snapshots:
+  on X::x {}:
+    fixed: ''
+    labels:
+    - source: on X::x {}
+      style: primary
+      start: 0
+      end: 10
+    - source: '{}'
+      style: secondary
+      start: 8
+      end: 10
+    - source: '{}'
+      style: secondary
+      start: 8
+      end: 10

rule-tests/empty-hook-inline-test.yml

@@ -0,0 +1,5 @@
+id: empty-hook-inline
+valid:
+  - "type X = unit { x: uint8 {1;} };"
+invalid:
+  - "type X = unit { x: uint8 {} };"

rule-tests/empty-hook-test.yml

@@ -0,0 +1,6 @@
+id: empty-hook
+valid:
+  - "on X::x {1;}"
+  - "on X::x {1;2;}"
+invalid:
+  - "on X::x {}"

rules/empty-hook-inline.yml

@@ -0,0 +1,14 @@
+id: empty-hook-inline
+message: Remove empty hook
+severity: error
+language: spicy
+
+rule:
+  kind: "block"
+  inside:
+    kind: "field_decl"
+  not:
+    has:
+      kind: "statement"
+
+fix: ";"

rules/empty-hook.yml

@@ -0,0 +1,16 @@
+id: empty-hook
+message: Remove empty hook
+severity: error
+language: spicy
+
+rule:
+  kind: "hook_decl"
+  has:
+    kind: "statement"
+    has:
+      kind: "block"
+      not:
+        has:
+          kind: "statement"
+
+fix: ""