Add updating existing open issue with the same title if it exists

README.md

@@ -73,7 +73,7 @@ steps:
 
 ### Inputs
 
-Want to use Action logic to determine who to assign the issue to? You can pass an input containing the following options:
+Want to use Action logic to determine who to assign the issue to, to assign a milestone or to update an existing issue with the same title? You can pass an input containing the following options:
 
 ```yaml
 steps:
@@ -84,8 +84,11 @@ steps:
     with:
       assignees: JasonEtco, octocat
       milestone: 1
+      update_existing: true
 ```
 
+The `assignees` and `milestone` speak for themselves, the `update_existing` param can be passed and set to `true` when you want an existing open issue with the **exact same title** when it exists.
+
 ### Outputs
 
 If you need the number or URL of the issue that was created for another Action, you can use the `number` or `url` outputs, respectively. For example:

action.yml

@@ -9,12 +9,17 @@ branding:
 inputs:
   assignees:
     description: GitHub handle of the user(s) to assign the issue (comma-separated)
+    required: false
   milestone:
     description: Number of the milestone to assign the issue to
     required: false
   filename:
     description: The name of the file to use as the issue template
     default: .github/ISSUE_TEMPLATE.md
+    required: false
+  update_existing:
+    description: Update an open existing issue with the same title if it exists
+    required: false
 outputs:
   number:
     description: Number of the issue that was created

index.js

@@ -12,6 +12,7 @@ function listToArray (list) {
 Toolkit.run(async tools => {
   const template = tools.inputs.filename || '.github/ISSUE_TEMPLATE.md'
   const assignees = tools.inputs.assignees
+  const updateExisting = Boolean(tools.inputs.update_existing)
   const env = nunjucks.configure({ autoescape: false })
   env.addFilter('date', dateFilter)
 
@@ -33,11 +34,39 @@ Toolkit.run(async tools => {
     body: env.renderString(body, templateVariables),
     title: env.renderString(attributes.title, templateVariables)
   }
-
   tools.log.debug('Templates compiled', templated)
-  tools.log.info(`Creating new issue ${templated.title}`)
+
+  if (updateExisting) {
+    let existingIssue
+    tools.log.info(`Fetching issues with title "${templated.title}"`)
+    try {
+      const existingIssues = await tools.github.search.issuesAndPullRequests({
+        q: `is:open is:issue repo:${process.env.GITHUB_REPOSITORY} in:title ${templated.title}`,
+        order: 'created'
+      })
+      existingIssue = existingIssues.data.items.find(issue => issue.title === templated.title)
+    } catch (err) {
+      tools.exit.failure(err)
+    }
+    if (existingIssue) {
+      try {
+        const issue = await tools.github.issues.update({
+          ...tools.context.repo,
+          issue_number: existingIssue.number,
+          body: templated.body
+        })
+        core.setOutput('number', String(issue.data.number))
+        core.setOutput('url', issue.data.html_url)
+        tools.exit.success(`Updated issue ${issue.data.title}#${issue.data.number}: ${issue.data.html_url}`)
+      } catch (err) {
+        tools.exit.failure(err)
+      }
+    }
+    tools.log.info('No existing issue found to update')
+  }
 
   // Create the new issue
+  tools.log.info(`Creating new issue ${templated.title}`)
   try {
     const issue = await tools.github.issues.create({
       ...tools.context.repo,

tests/__snapshots__/index.test.js.snap

@@ -34,6 +34,19 @@ Array [
 ]
 `;
 
+exports[`create-an-issue creates a new issue when updating existing issues is enabled but no issues with the same title exist 1`] = `
+Object {
+  "assignees": Array [
+    "octocat",
+    "JasonEtco",
+  ],
+  "body": "Goodbye!",
+  "labels": Array [],
+  "milestone": "1",
+  "title": "Hello!",
+}
+`;
+
 exports[`create-an-issue creates a new issue with a milestone passed by input 1`] = `
 Object {
   "assignees": Array [
@@ -179,3 +192,16 @@ Array [
   ],
 ]
 `;
+
+exports[`create-an-issue updates an existing issue with the same title 1`] = `
+Object {
+  "assignees": Array [
+    "octocat",
+    "JasonEtco",
+  ],
+  "body": "Goodbye!",
+  "labels": Array [],
+  "milestone": "1",
+  "title": "Hello!",
+}
+`;

tests/index.test.js

@@ -117,6 +117,57 @@ describe('create-an-issue', () => {
     expect(tools.log.success).toHaveBeenCalled()
   })
 
+  it('creates a new issue when updating existing issues is enabled but no issues with the same title exist', async () => {
+    nock.cleanAll()
+    nock('https://api.github.com')
+      .get(/\/search\/issues.*/).reply(200, {
+        items: []
+      })
+      .post(/\/repos\/.*\/.*\/issues/).reply(200, (_, body) => {
+        params = body
+        return {
+          title: body.title,
+          number: 1,
+          html_url: 'www'
+        }
+      })
+
+    process.env.INPUT_UPDATE_EXISTING = 'true'
+
+    await actionFn(tools)
+    expect(params).toMatchSnapshot()
+    expect(tools.log.info).toHaveBeenCalledWith('No existing issue found to update')
+    expect(tools.log.success).toHaveBeenCalled()
+  })
+
+  it('updates an existing issue with the same title', async () => {
+    nock.cleanAll()
+    nock('https://api.github.com')
+      .get(/\/search\/issues.*/).reply(200, {
+        items: [{ number: 1, title: 'Hello!' }]
+      })
+      .patch(/\/repos\/.*\/.*\/issues\/.*/).reply(200, {})
+    process.env.INPUT_UPDATE_EXISTING = 'true'
+
+    await actionFn(tools)
+    expect(params).toMatchSnapshot()
+    expect(tools.exit.success).toHaveBeenCalled()
+  })
+
+  it('exits when updating an issue fails', async () => {
+    nock.cleanAll()
+    nock('https://api.github.com')
+      .get(/\/search\/issues.*/).reply(200, {
+        items: [{ number: 1, title: 'Hello!' }]
+      })
+      .patch(/\/repos\/.*\/.*\/issues\/.*/).reply(500, {
+        message: 'Updating issue failed'
+      })
+
+    await actionFn(tools)
+    expect(tools.exit.failure).toHaveBeenCalled()
+  })
+
   it('logs a helpful error if creating an issue throws an error', async () => {
     nock.cleanAll()
     nock('https://api.github.com')