How to convert a PDF file into a Markdown file or HTML file?

To convert a PDF into a Markdown file using the Python-based tool called Marker on Ubuntu, you need to set up the environment, install the

marker-pdf package, and then use the command-line interface. 

Prerequisites

Before installing Marker, ensure your Ubuntu system meets the following prerequisites:

• Python: Version 3.10 or higher is required.
• PyTorch: Marker needs PyTorch to run, as it relies on deep learning models.
• System Libraries: You may need additional system libraries for advanced features like OCR with ocrmypdf or tesseract. 

Step-by-Step Guide

1. Open your terminal on Ubuntu.
2. Install system dependencies (optional, but recommended for full functionality, including OCR):
   bash

   # Install required apt packages
   sudo apt-get update
   sudo apt-get install -y build-essential libssl-dev libffi-dev python3-dev
   # Install tesseract and ghostscript related dependencies
   sudo apt-get install -y libleptonica-dev libtesseract-dev pkg-config
   sudo apt-get install -y ocrmypdf ghostscript
   

3. Create a virtual environment to avoid conflicts with other Python projects (recommended):
   bash

   python3 -m venv marker_env
   source marker_env/bin/activate
   

4. Install PyTorch by following the instructions on the official PyTorch website for your specific system configuration (CPU or GPU). A typical CPU-only installation command might look like:
   bash

   pip install torch torchvision torchaudio
   

5. Install Marker using pip. You can install the basic PDF package or the full version for other document types:
   bash

   # For PDF conversion only
   pip install marker-pdf
   
   # For full functionality (PDFs, images, etc.)
   # pip install 'marker-pdf[full]'
   

6. Convert a PDF file to Markdown using the command line tool marker_single.
   
   $ marker_single /path/to/file.pdf  
   
   --output_format [markdown|json|html|chunks]: Specify the format for the output results.
   --output_dir PATH: Directory where output files will be saved. Defaults to the value specified in settings.OUTPUT_DIR.
   
   https://github.com/datalab-to/marker

How to automatically create 'Table of Contents' of a markdown text file in vim?

To use the Vim global command for lines containing only "===" or "---", the pattern needs to match the entire line content exactly.

Here is how to construct the pattern:

Code

:g/^\(===\|---\)/-1p

Explanation of the pattern:

• ^: This anchor matches the beginning of the line. It ensures that the pattern must start at the very beginning of the line.
• \(...\): This creates a capturing group for alternation.
• ===: This matches the literal string "===".
• \|: This is the OR operator within a regular expression. It allows matching either the pattern before it or the pattern after it.
• ---: This matches the literal string "---".
• \): This closes the capturing group.
• -1 : Print the line above the '===' line (or '---' line)
• p : Print

cssUniversal.html

<style>

    body {

        margin: 0;

        background-color: rgba(0, 0, 0, 0.09);

        color: rgba(0, 0, 0, 0.6);

        font-family: sans-serif;

    }

    div.container {

        display: flex;

        justify-content: center;

        min-height: 100vh;

        padding: 1rem;

    }

    div.card {

        background-color: rgba(255, 255, 255, 1);

        max-width: 585px;

        width: 100%;

        box-shadow:

            0 4px 8px 0 rgba(0, 0, 0, 0.2),

            0 6px 20px 0 rgba(0, 0, 0, 0.19);

        padding: 1rem;

        border-radius: 4px;

    }

    h1,

    h2,

    h3 {

        margin: 1.5rem 0 0.75rem 0;

    }

    div.card {

        padding-bottom: 3rem;

    }

    .contact {

        text-align: center;

    }

    table {

        font-family: Arial, Helvetica, sans-serif;

        border-collapse: collapse;

        width: 100%;

    }

    

    td, th {

        border: 1px solid #ddd;

        padding: 8px;

    }

    

    tr:nth-child(even){background-color: #f2f2f2;}

    

    tr:hover {background-color: #ddd;}

    

    th {

        padding-top: 12px;

        padding-bottom: 12px;

        text-align: left;

        background-color: #04AA6D;

        color: white;

    }

    @media print {

        body {

            background: white !important;

        }

        .container {

            display: block;

            min-height: auto;

            padding: 0;

            margin: 0;

        }

        .card {

            box-shadow: none !important;

            border: none;

            background: white !important;

            max-width: 100%;

            padding: 1in;

        }

        body, p, li, h1, h2, h3 {

            color: black; !important;

            font-family: "Arial", sans-serif;

        }

        nav, footer, .no-print {

            display: none !important;

        }

        a {

            color: black;

            text-decoration: none;

        }

    }

</style>

<body>

    <div class="container">

        <div class="card">

            <div class="contact">...</div>

            ...

        </div>

    </div>

</body>

How to Transform or Say Convert Different Format of Files Such as .md, .rst, .html, .docx, .pdf, etc.?

Install 'pandoc' software

How to install pandoc?

$ sudo apt update
$ sudo apt install pandoc

 

How to use pandoc?

$ tldr pandoc