Patched patchwork/steps/ReadEmail/README.md (#1330)

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patchwork/steps/ReadEmail/README.md

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+# ReadEmail Module Documentation
+
+This documentation describes the ReadEmail module, which is structured to facilitate the reading and parsing of email files encoded in the `.eml` format. The module is divided across three main source files: `__init__.py`, `ReadEmail.py`, and `typed.py`. Below, we describe the functionalities of these components, including input and output specifications.
+
+---
+
+## 1. Overview
+
+The ReadEmail module is designed to read `.eml` files, parse the email headers, body, and attachments, and return this data in a structured form. It's intended for applications where email processing and analysis are required, such as in email clients, document processing systems, or automated data extraction tasks.
+
+---
+
+## 2. Files
+
+### 2.1. `__init__.py`
+
+This file is an empty file created to make the directory a Python package. It contains no code or logic.
+
+### 2.2. `ReadEmail.py`
+
+This file contains the main logic of the ReadEmail module. Below is a breakdown of its components.
+
+#### 2.2.1. Classes
+
+- **ParsedHeader**: Represents the parsed email header with fields such as `subject`, `from`, `to`, and `date`.
+- **ParsedBody**: Represents the content and content type of the email body.
+- **AttachmentHeader**: Contains fields related to the attachment's header such as content disposition and encoding.
+- **ParsedAttachment**: Represents an attachment with fields including `filename`, `raw` content, and `content_header`.
+- **ParsedEmail**: Combines all parsed data (header, body, attachment).
+- **ReadEmail**: Inherits from the `Step` class and contains the core functionality for running the email parsing task.
+
+#### 2.2.2. Key Methods
+
+- **`__decode`**: Decodes the email content based on its encoding, e.g., `base64` or `quoted-printable`.
+- **`run`**: Executes the parsing process using `EmlParser`, processes email data, attaches parsed data, and decodes attachments.
+
+### 2.3. `typed.py`
+
+This file defines the input and output types used by the `ReadEmail` class.
+
+#### 2.3.1. Inputs
+
+- `eml_file_path`: Path to the `.eml` email file to be processed.
+- `base_path`: (Optional) Base directory path where attachments should be saved.
+
+#### 2.3.2. Outputs
+
+- `subject`: Email subject.
+- `datetime`: Date and time the email was sent.
+- `from_`: Sender's email.
+- `body`: Full body text of the email.
+- `message_id`: Unique message identifier.
+- `attachments`: List of attachments with file paths.
+
+---
+
+## 3. Usage
+
+To utilize the ReadEmail module effectively, instantiate the `ReadEmail` class with the required inputs and execute the `run` method. The `run` method will parse the email and return a dictionary containing the parsed data.
+
+### Example
+
+```python
+inputs = {
+    "eml_file_path": "path/to/email.eml",
+    "base_path": "path/to/save/attachments"
+}
+
+read_email = ReadEmail(inputs)
+parsed_data = read_email.run()
+
+print(parsed_data["subject"])
+print(parsed_data["body"])
+for attachment in parsed_data["attachments"]:
+    print(attachment["path"])
+```
+
+This example will print out the email subject, body, and paths to any attachments extracted from the specified `.eml` file.
+
+---
+
+By following this guide, users can effectively integrate and utilize the ReadEmail module for processing and extracting information from `.eml` files in their applications.