Attach multiple files to mail message

README.md

@@ -21,6 +21,6 @@ An action that simply sends a mail to multiple recipients.
     from: Luke Skywalker # <user@example.com>
     # Optional content type (defaults to text/plain):
     content_type: text/html
-    # Optional single file attachment
-    attach_file: attachments.zip
+    # Optional attachments
+    attach_files: attachments.zip,git.diff,./dist/static/main.js
 ```

action.yml

@@ -33,8 +33,8 @@ inputs:
     description: Content-Type HTTP header (text/html or text/plain)
     required: false
     default: text/plain
-  attach_file:
-    description: File path that will be added to mail message attachments
+  attach_files:
+    description: File paths (separated with comma) that will be added to mail message attachments
     required: false
 runs:
   using: node12

main.js

@@ -19,6 +19,16 @@ function get_from(from, username) {
     return `"${from}" <${username}>`
 }
 
+function get_attachments(attach_files) {
+    attach_files = attach_files.split(',')
+    let attachments = []
+    for (const attach_file of attach_files) {
+        attachments.push({path: attach_file})
+    }
+
+    return attachments
+}
+
 async function main() {
     try {
         const server_address = core.getInput("server_address", { required: true })
@@ -30,7 +40,7 @@ async function main() {
         const to = core.getInput("to", { required: true })
         const from = core.getInput("from", { required: true })
         const content_type = core.getInput("content_type", { required: true })
-        const attach_file = core.getInput("attach_file", { required: false })
+        const attach_files = core.getInput("attach_files", { required: false })
 
         const transport = nodemailer.createTransport({
             host: server_address,
@@ -48,9 +58,7 @@ async function main() {
             subject: subject,
             text: content_type != "text/html" ? get_body(body) : undefined,
             html: content_type == "text/html" ? get_body(body) : undefined,
-            attachments: attach_file ? {
-                path: attach_file
-            } : undefined
+            attachments: attach_files ? get_attachments(attach_files) : undefined
         })
 
         console.log(info)