# Generate C API HTML docs from Google Drive headers with OpenAI: n8n workflow

> Started by an event in a connected app, and works across Gmail and Google Drive. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/generate-c-api-html-docs-from-google-drive-headers-with-open (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [AI assistants](https://millionrounds.com/workflows?category=AI+assistants#library)

# Generate C API HTML docs from Google Drive headers with OpenAI

Started by an event in a connected app, and works across Gmail and Google Drive. It hands the judgement calls to OpenAI. 12 steps, 1 loop or waits: a working afternoon to understand properly.

Medium Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fgenerate-c-api-html-docs-from-google-drive-headers-with-open)

**12 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**1** Loop or waits

**2** Services it connects to

## The flow

Starts it 1 Model 1 Logic 5 Service 5

The steps in the order they run, from what starts it.

- 1 **When clicking ‘Execute workflow’** Manual trigger *Starts it*
- 2 **Get all files from folder** Google Drive *Service*
- 3 **Filter.h files only** Code *Logic*
- 4 **Process one file at a time** Split In Batches *Logic*
- 5 **Build email body** Code *Logic*
- 6 **Download file** Google Drive *Service*
- 7 **Send completion email** Gmail *Service*
- 8 **Extract from File2** Extract From File *Service*
- 9 **Extract structured docs (GPT-4o)** Open Ai *Model*
- 10 **Parse JSON response** Code *Logic*
- 11 **Generate HTML** Code *Logic*
- 12 **Save PDF to Google Drive** Google Drive *Service*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 12, 1 loop or waits
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Google Drive
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Gmail and Google Drive accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 12 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 12 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fgenerate-c-api-html-docs-from-google-drive-headers-with-open)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Google Drive](https://millionrounds.com/workflows?service=Google+Drive#library)

## Workflows like it

Also ai assistants, with the same services where possible, closest in size first.

- [**AI email autoresponder with OpenAI and Gmail** 12 steps · calls a model · Email, Gmail](https://millionrounds.com/workflow/ai-email-autoresponder-with-openai-and-gmail)
- [**AI-powered email processing autoresponder** 12 steps · calls a model · Email, Gmail](https://millionrounds.com/workflow/ai-powered-email-processing-autoresponder)
- [**AI-powered email processing autoresponder** 12 steps · calls a model · Email, Gmail](https://millionrounds.com/workflow/ai-powered-email-processing-autoresponder-2)
- [**AutoTube Pro: AI-powered YouTube upload automation** 12 steps · calls a model · Google Drive, YouTube](https://millionrounds.com/workflow/autotube-pro-ai-powered-youtube-upload-automation)
- [**Automate YouTube uploads with Gemini and OpenAI** 12 steps · calls a model · Google Drive, YouTube](https://millionrounds.com/workflow/automate-youtube-uploads-with-gemini-and-openai)
- [**Automate email management with Gemini and Gmail** 12 steps · calls a model · Gmail](https://millionrounds.com/workflow/automate-email-management-with-gemini-and-gmail)