added thread-ts as an output. Fixes #73

action.yml

@@ -16,6 +16,8 @@ inputs:
 outputs:
   time: # id of output
     description: 'The time'
+  thread_ts: # timestamp on the message that was posted when using bot token
+    description: 'The timestamp on the message that was posted into Slack when using bot token'
 runs:
   using: 'node12'
   main: 'dist/index.js'

src/slack-send.js

@@ -31,6 +31,8 @@ module.exports = async function slackSend(core) {
 
     const payloadFilePath = core.getInput('payload-file-path');
 
+    let webResponse;
+
     if (payloadFilePath && !payload) {
       try {
         payload = await fs.readFile(path.resolve(payloadFilePath), 'utf-8');
@@ -68,7 +70,7 @@ module.exports = async function slackSend(core) {
 
       if (message.length > 0 || payload) {
         // post message
-        await web.chat.postMessage({ channel: channelId, text: message, ...(payload || {}) });
+        webResponse = await web.chat.postMessage({ channel: channelId, text: message, ...(payload || {}) });
       } else {
         console.log('Missing slack-message or payload! Did not send a message via chat.postMessage with botToken', { channel: channelId, text: message, ...(payload) });
         throw new Error('Missing message content, please input a valid payload or message to send. No Message has been send.');
@@ -112,6 +114,12 @@ module.exports = async function slackSend(core) {
       }
     }
 
+    if (webResponse && webResponse.ok) {
+      // return the thread_ts if it exists, if not return the ts
+      const thread_ts = webResponse.thread_ts ? webResponse.thread_ts : webResponse.ts;
+      core.setOutput('thread_ts', thread_ts);
+    }
+
     const time = (new Date()).toTimeString();
     core.setOutput('time', time);
   } catch (error) {

test/slack-send-test.js

@@ -5,7 +5,7 @@ const github = require('@actions/github');
 const rewiremock = require('rewiremock/node');
 
 const ChatStub = {
-  postMessage: sinon.spy(),
+  postMessage: sinon.fake.resolves({ ok: true, thread_ts: '1503435956.000247' }),
 };
 /* eslint-disable-next-line global-require */
 rewiremock(() => require('@slack/web-api')).with({
@@ -57,6 +57,8 @@ describe('slack-send', () => {
         fakeCore.getInput.withArgs('slack-message').returns('who let the dogs out?');
         fakeCore.getInput.withArgs('channel-id').returns('C123456');
         await slackSend(fakeCore);
+        assert.equal(fakeCore.setOutput.firstCall.firstArg, 'thread_ts', 'Output name set to thread_ts');
+        assert(fakeCore.setOutput.firstCall.lastArg.length > 0, 'Time output a non-zero-length string');
         assert.equal(fakeCore.setOutput.lastCall.firstArg, 'time', 'Output name set to time');
         assert(fakeCore.setOutput.lastCall.lastArg.length > 0, 'Time output a non-zero-length string');
         const chatArgs = ChatStub.postMessage.lastCall.firstArg;
@@ -74,6 +76,8 @@ describe('slack-send', () => {
         await slackSend(fakeCore);
 
         // Assert
+        assert.equal(fakeCore.setOutput.firstCall.firstArg, 'thread_ts', 'Output name set to thread_ts');
+        assert(fakeCore.setOutput.firstCall.lastArg.length > 0, 'Time output a non-zero-length string');
         assert.equal(fakeCore.setOutput.lastCall.firstArg, 'time', 'Output name set to time');
         assert(fakeCore.setOutput.lastCall.lastArg.length > 0, 'Time output a non-zero-length string');
         const chatArgs = ChatStub.postMessage.lastCall.firstArg;