feat: set close reason

Closes #10.

README.md

@@ -53,6 +53,10 @@ The action can be configured using [input parameters](https://docs.github.com/en
   - Close issues marked as support requests,
     value must be either `true` or `false`
   - Optional, defaults to `true`
+- **`issue-close-reason`**
+  - Reason for closing issues, value must be
+    either `completed` or `not planned`
+  - Optional, defaults to `not planned`
 - **`lock-issue`**
   - Lock issues marked as support requests,
     value must be either `true` or `false`
@@ -115,6 +119,7 @@ jobs:
             to be a support request. Please use our support channels
             to get help with the project.
           close-issue: true
+          issue-close-reason: 'not planned'
           lock-issue: false
           issue-lock-reason: 'off-topic'
 ```

action.yml

@@ -17,6 +17,9 @@ inputs:
   close-issue:
     description: 'Close issues marked as support requests, value must be either `true` or `false`'
     default: true
+  issue-close-reason:
+    description: 'Reason for closing issues, value must be either `completed` or `not planned`'
+    default: 'not planned'
   lock-issue:
     description: Lock issues marked as support requests, value must be either `true` or `false`'
     default: false

src/index.js

@@ -54,7 +54,15 @@ class App {
 
     if (this.config['close-issue'] && issueData.state === 'open') {
       core.debug(`Closing (issue: ${issue.issue_number})`);
-      await this.client.rest.issues.update({...issue, state: 'closed'});
+
+      const params = {...issue, state: 'closed'};
+
+      const closeReason = this.config['issue-close-reason'];
+      if (closeReason) {
+        params.state_reason = closeReason;
+      }
+
+      await this.client.rest.issues.update(params);
     }
 
     if (this.config['lock-issue'] && !issueData.locked) {

src/schema.js

@@ -1,5 +1,23 @@
 import Joi from 'joi';
 
+const extendedJoi = Joi.extend(joi => {
+  return {
+    type: 'closeReason',
+    base: joi.string(),
+    coerce: {
+      from: 'string',
+      method(value, helpers) {
+        value = value.trim();
+        if (value === 'not planned') {
+          value = 'not_planned';
+        }
+
+        return {value};
+      }
+    }
+  };
+});
+
 const schema = Joi.object({
   'github-token': Joi.string().trim().max(100),
 
@@ -18,6 +36,11 @@ const schema = Joi.object({
 
   'close-issue': Joi.boolean().default(true),
 
+  'issue-close-reason': extendedJoi
+    .closeReason()
+    .valid('completed', 'not_planned', '')
+    .default('not planned'),
+
   'lock-issue': Joi.boolean().default(true),
 
   'issue-lock-reason': Joi.string()