Add initial action setup

src/main.ts

@@ -0,0 +1,97 @@
+/* eslint-disable github/no-then */
+
+import * as core from '@actions/core'
+import * as github from '@actions/github'
+
+// TODO: Ensure this (and the Octokit client) works for non-github.com URLs, as well.
+// https://github.com/orgs/<orgName>/projects/<projectNumber>
+const urlParse =
+  /^(?:https:\/\/)?github\.com\/orgs\/(?<orgName>[^/]+)\/projects\/(?<projectNumber>\d+)/
+
+interface ProjectNodeIDResponse {
+  organization: {
+    projectNext: {
+      id: string
+    }
+  }
+}
+
+interface ProjectAddItemResponse {
+  addProjectNextItem: {
+    projectNextItem: {
+      id: string
+    }
+  }
+}
+
+async function run(): Promise<void> {
+  const projectUrl = core.getInput('project-url', {required: true})
+  const ghToken = core.getInput('github-token', {required: true})
+  const octokit = github.getOctokit(ghToken)
+  const urlMatch = projectUrl.match(urlParse)
+
+  core.debug(`Project URL: ${projectUrl}`)
+
+  if (!urlMatch) {
+    throw new Error(
+      `Invalid project URL: ${projectUrl}. Project URL should match the format https://github.com/orgs/<orgName>/projects/<projectNumber>`
+    )
+  }
+
+  const orgName = urlMatch.groups?.orgName
+  const projectNumber = parseInt(urlMatch.groups?.projectNumber ?? '', 10)
+
+  core.debug(`Org name: ${orgName}`)
+  core.debug(`Project number: ${projectNumber}`)
+
+  // First, use the GraphQL API to request the project's node ID.
+  const idResp = await octokit.graphql<ProjectNodeIDResponse>(
+    `query getProject($orgName: String!, $projectNumber: Int!) { 
+      organization(login: $orgName) {
+        projectNext(number: $projectNumber) {
+          id
+        }
+      }
+    }`,
+    {
+      orgName,
+      projectNumber
+    }
+  )
+
+  const projectId = idResp.organization.projectNext.id
+  const contentId =
+    github.context.payload.issue?.node_id ??
+    github.context.payload.pull_request?.node_id
+
+  core.debug(`Project node ID: ${projectId}`)
+  core.debug(`Content ID: ${contentId}`)
+
+  // Next, use the GraphQL API to add the issue to the project.
+  const addResp = await octokit.graphql<ProjectAddItemResponse>(
+    `mutation addIssueToProject($input: AddProjectNextItemInput!) {
+      addProjectNextItem(input: $input) {
+        projectNextItem {
+          id
+        }
+      }
+    }`,
+    {
+      input: {
+        contentId,
+        projectId
+      }
+    }
+  )
+
+  core.setOutput('itemId', addResp.addProjectNextItem.projectNextItem.id)
+}
+
+run()
+  .catch(err => {
+    core.setFailed(err.message)
+    process.exit(1)
+  })
+  .then(() => {
+    process.exit(0)
+  })