scripts/pdf2md.html at main · mytech-today-now/scripts · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>PDF to Markdown Bulk Converter</title>

    <!-- React & ReactDOM -->
    <script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
    <script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>

    <!-- Babel for JSX -->
    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

    <!-- Tailwind CSS -->
    <script src="https://cdn.tailwindcss.com"></script>

    <!-- PDF.js -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
    <script>
        pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
    </script>

    <!-- JSZip -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js"></script>

    <!-- Lucide Icons -->
    <script src="https://unpkg.com/lucide@latest"></script>

    <style>
        @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
        body { font-family: 'Inter', sans-serif; }
        .scrollbar-hide::-webkit-scrollbar { display: none; }
        .scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }
    </style>
</head>
<body class="bg-slate-50 text-slate-900 h-screen flex flex-col overflow-hidden">

    <div id="root" class="h-full w-full"></div>

    <script type="text/babel">
        const { useState, useCallback, useRef, useEffect } = React;

        // --- PDF Processing Logic ---

        const processPDF = async (file) => {
            const arrayBuffer = await file.arrayBuffer();
            const pdf = await pdfjsLib.getDocument({ data: arrayBuffer }).promise;

            let fullTextItems = [];
            let totalHeight = 0;
            let totalItems = 0;

            // 1. Extract raw items with position and font data
            for (let i = 1; i <= pdf.numPages; i++) {
                const page = await pdf.getPage(i);
                const viewport = page.getViewport({ scale: 1.0 });
                const textContent = await page.getTextContent();

                // Process items for this page
                const pageItems = textContent.items.map(item => {
                    // Approximate font height using transform matrix (scale Y)
                    const height = Math.abs(item.transform[3]);
                    if (item.str.trim().length > 0) {
                        totalHeight += height;
                        totalItems++;
                    }
                    return {
                        str: item.str,
                        x: item.transform[4],
                        y: viewport.height - item.transform[5], // Flip Y to top-down
                        h: height,
                        w: item.width,
                        hasEOL: item.hasEOL,
                        page: i
                    };
                });

                fullTextItems = [...fullTextItems, ...pageItems];
            }

            // Calculate average font size (Body text)
            const avgHeight = totalItems > 0 ? totalHeight / totalItems : 12;

            // Heuristic thresholds
            const headerThreshold = avgHeight * 1.15; // Slightly larger = Header
            const subHeaderThreshold = avgHeight * 1.4; // Much larger = H2/H1

            // Sort by Page -> Y (Top to Bottom) -> X (Left to Right)
            fullTextItems.sort((a, b) => {
                if (a.page !== b.page) return a.page - b.page;
                // Group by line (tolerance of 5px)
                if (Math.abs(a.y - b.y) > 5) return a.y - b.y;
                return a.x - b.x;
            });

            // Group into visual lines
            const lines = [];
            let currentLine = { y: -1, items: [], page: -1 };

            fullTextItems.forEach(item => {
                if (item.page !== currentLine.page || Math.abs(item.y - currentLine.y) > 5) {
                    if (currentLine.items.length > 0) lines.push(currentLine);
                    currentLine = { y: item.y, items: [item], page: item.page };
                } else {
                    currentLine.items.push(item);
                }
            });
            if (currentLine.items.length > 0) lines.push(currentLine);

            // Convert lines to Markdown with Heuristics
            let markdownLines = [];

            lines.forEach((line) => {
                // Construct line string
                let lineStr = line.items.map(i => i.str).join(" ").trim();
                if (!lineStr) return;

                // 1. Filter junk (Page numbers, simple footers)
                const isPageNum = /^(Page\s*)?\d+(\s*of\s*\d+)?$/i.test(lineStr);
                if (isPageNum) return; // Skip page numbers

                // Get max font size in this line to determine header status
                const maxLineHeight = Math.max(...line.items.map(i => i.h));

                // 2. Header Detection
                let prefix = "";
                if (maxLineHeight > subHeaderThreshold) {
                    prefix = "## ";
                } else if (maxLineHeight > headerThreshold) {
                    prefix = "### ";
                }

                // 3. List Detection
                // Fix common bullet points to markdown
                if (/^[•●\-]/.test(lineStr)) {
                    lineStr = lineStr.replace(/^[•●\-]\s*/, "- ");
                    prefix = ""; // Don't make lists headers even if font is big
                } else if (/^\d+\./.test(lineStr)) {
                    // Ordered list, keep as is
                    prefix = "";
                }

                markdownLines.push(prefix + lineStr);
            });

            // --- Post-Processing Cleaning ---

            let rawMD = markdownLines.join("\n");

            // 1. Merge hyphenated words at end of line
            rawMD = rawMD.replace(/(\w)-\n(\w)/g, '$1$2');

            // 2. Merge hard-wrapped lines (Sentence not ending with punctuation)
            // Look for: Line ending with word char, newline, next line starts with lowercase
            // This is conservative to avoid merging distinct list items
            rawMD = rawMD.replace(/([^\.\!\?\:\-])\n([a-z])/g, '$1 $2');

            // 3. Normalize whitespace
            // Replace 3+ newlines with 2
            rawMD = rawMD.replace(/\n{3,}/g, '\n\n');

            // Add Title
            const title = file.name.replace(/\.[^/.]+$/, "");
            return `# ${title}\n\n${rawMD}`;
        };

        // --- Components ---

        const Icon = ({ name, className }) => {
            useEffect(() => {
                lucide.createIcons();
            }, [name]);
            return <i data-lucide={name} className={className}></i>;
        };

        const FileRow = ({ fileData, onDownload, onRemove }) => {
            const statusColor = {
                queued: 'bg-slate-200 text-slate-500',
                processing: 'bg-blue-100 text-blue-600',
                done: 'bg-green-100 text-green-700',
                error: 'bg-red-100 text-red-600'
            };

            return (
                <div className="flex items-center justify-between p-4 bg-white border border-slate-200 rounded-lg shadow-sm hover:shadow-md transition-all mb-3 group">
                    <div className="flex items-center space-x-4 overflow-hidden">
                        <div className={`p-2 rounded-full ${statusColor[fileData.status]}`}>
                            {fileData.status === 'processing' ? (
                                <Icon name="loader-2" className="w-5 h-5 animate-spin" />
                            ) : fileData.status === 'done' ? (
                                <Icon name="file-check" className="w-5 h-5" />
                            ) : (
                                <Icon name="file-text" className="w-5 h-5" />
                            )}
                        </div>
                        <div className="flex flex-col min-w-0">
                            <span className="font-medium text-slate-800 truncate block">{fileData.file.name}</span>
                            <span className="text-xs text-slate-500">
                                {(fileData.file.size / 1024 / 1024).toFixed(2)} MB • {fileData.status.toUpperCase()}
                            </span>
                        </div>
                    </div>

                    <div className="flex items-center space-x-2">
                        {fileData.status === 'done' && (
                            <button
                                onClick={() => onDownload(fileData.id)}
                                className="p-2 text-slate-500 hover:text-blue-600 hover:bg-blue-50 rounded-md transition-colors"
                                title="Download MD"
                            >
                                <Icon name="download" className="w-5 h-5" />
                            </button>
                        )}
                        <button
                            onClick={() => onRemove(fileData.id)}
                            className="p-2 text-slate-400 hover:text-red-500 hover:bg-red-50 rounded-md transition-colors"
                            title="Remove"
                        >
                            <Icon name="x" className="w-5 h-5" />
                        </button>
                    </div>
                </div>
            );
        };

        const App = () => {
            const [files, setFiles] = useState([]);
            const [isDragging, setIsDragging] = useState(false);
            const [isProcessing, setIsProcessing] = useState(false);
            const fileInputRef = useRef(null);

            const handleDragOver = (e) => {
                e.preventDefault();
                setIsDragging(true);
            };

            const handleDragLeave = () => {
                setIsDragging(false);
            };

            const addFiles = (newFiles) => {
                const mapped = Array.from(newFiles)
                    .filter(f => f.type === 'application/pdf')
                    .map(f => ({
                        id: Math.random().toString(36).substr(2, 9),
                        file: f,
                        status: 'queued',
                        md: null
                    }));
                setFiles(prev => [...prev, ...mapped]);
            };

            const handleDrop = (e) => {
                e.preventDefault();
                setIsDragging(false);
                addFiles(e.dataTransfer.files);
            };

            const handleFileInput = (e) => {
                addFiles(e.target.files);
                e.target.value = null; // reset
            };

            const removeFile = (id) => {
                setFiles(prev => prev.filter(f => f.id !== id));
            };

            const updateFileStatus = (id, status, md = null) => {
                setFiles(prev => prev.map(f =>
                    f.id === id ? { ...f, status, md: md || f.md } : f
                ));
            };

            const convertAll = async () => {
                setIsProcessing(true);
                const queue = files.filter(f => f.status === 'queued');

                // Process sequentially to not freeze browser on weak machines
                for (const item of queue) {
                    updateFileStatus(item.id, 'processing');
                    try {
                        const markdown = await processPDF(item.file);
                        updateFileStatus(item.id, 'done', markdown);
                    } catch (err) {
                        console.error(err);
                        updateFileStatus(item.id, 'error');
                    }
                }
                setIsProcessing(false);
            };

            const downloadFile = (id) => {
                const file = files.find(f => f.id === id);
                if (!file || !file.md) return;

                const blob = new Blob([file.md], { type: 'text/markdown' });
                const url = URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.href = url;
                a.download = file.file.name.replace(/\.[^/.]+$/, "") + ".md";
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                URL.revokeObjectURL(url);
            };

            const downloadAllZip = async () => {
                const zip = new JSZip();
                const processed = files.filter(f => f.status === 'done');

                if (processed.length === 0) return;

                processed.forEach(f => {
                    const name = f.file.name.replace(/\.[^/.]+$/, "") + ".md";
                    zip.file(name, f.md);
                });

                const content = await zip.generateAsync({ type: "blob" });
                const url = URL.createObjectURL(content);
                const a = document.createElement('a');
                a.href = url;
                a.download = "converted_markdown_files.zip";
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
            };

            const stats = {
                total: files.length,
                done: files.filter(f => f.status === 'done').length,
                queued: files.filter(f => f.status === 'queued').length
            };

            useEffect(() => {
                lucide.createIcons();
            }, [files]); // Re-run icons when list changes

            return (
                <div className="flex flex-col h-full max-w-5xl mx-auto w-full p-4 md:p-8">

                    {/* Header */}
                    <div className="mb-8 text-center md:text-left">
                        <h1 className="text-3xl font-bold text-slate-800 mb-2">PDF to Markdown</h1>
                        <p className="text-slate-500">Bulk convert PDFs to clean, LLM-ready Markdown files.</p>
                    </div>

                    {/* Main Workspace */}
                    <div className="flex-1 flex flex-col md:flex-row gap-6 overflow-hidden min-h-0">

                        {/* Drop Zone */}
                        <div
                            className={`md:w-1/3 flex-shrink-0 border-2 border-dashed rounded-xl flex flex-col items-center justify-center p-8 transition-all cursor-pointer
                                ${isDragging ? 'border-blue-500 bg-blue-50' : 'border-slate-300 hover:border-blue-400 hover:bg-slate-50'}`}
                            onDragOver={handleDragOver}
                            onDragLeave={handleDragLeave}
                            onDrop={handleDrop}
                            onClick={() => fileInputRef.current.click()}
                        >
                            <input
                                type="file"
                                multiple
                                accept="application/pdf"
                                className="hidden"
                                ref={fileInputRef}
                                onChange={handleFileInput}
                            />
                            <div className="bg-blue-100 p-4 rounded-full mb-4 text-blue-600">
                                <Icon name="upload-cloud" className="w-8 h-8" />
                            </div>
                            <h3 className="text-lg font-semibold text-slate-700 mb-1">Upload PDFs</h3>
                            <p className="text-sm text-slate-500 text-center">Drag & drop files here<br/>or click to browse</p>
                        </div>

                        {/* File List & Actions */}
                        <div className="flex-1 flex flex-col min-h-0 bg-white rounded-xl shadow-sm border border-slate-200 overflow-hidden">

                            {/* Toolbar */}
                            <div className="p-4 border-b border-slate-100 flex items-center justify-between bg-slate-50">
                                <div className="text-sm font-medium text-slate-600">
                                    Queue: {stats.done}/{stats.total}
                                </div>
                                <div className="flex space-x-2">
                                    {stats.queued > 0 && (
                                        <button
                                            onClick={convertAll}
                                            disabled={isProcessing}
                                            className="flex items-center space-x-2 px-4 py-2 bg-blue-600 text-white rounded-md text-sm font-medium hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
                                        >
                                            {isProcessing ? (
                                                <><Icon name="loader-2" className="w-4 h-4 animate-spin" /> <span>Processing...</span></>
                                            ) : (
                                                <><Icon name="play" className="w-4 h-4" /> <span>Convert All</span></>
                                            )}
                                        </button>
                                    )}
                                    {stats.done > 0 && (
                                        <button
                                            onClick={downloadAllZip}
                                            className="flex items-center space-x-2 px-4 py-2 bg-slate-800 text-white rounded-md text-sm font-medium hover:bg-slate-900 transition-colors"
                                        >
                                            <Icon name="archive" className="w-4 h-4" />
                                            <span>Download All (.zip)</span>
                                        </button>
                                    )}
                                </div>
                            </div>

                            {/* Scrollable List */}
                            <div className="flex-1 overflow-y-auto p-4 bg-slate-50/50">
                                {files.length === 0 ? (
                                    <div className="h-full flex flex-col items-center justify-center text-slate-400">
                                        <Icon name="files" className="w-12 h-12 mb-3 opacity-20" />
                                        <p>No files queued</p>
                                    </div>
                                ) : (
                                    files.map(f => (
                                        <FileRow
                                            key={f.id}
                                            fileData={f}
                                            onDownload={downloadFile}
                                            onRemove={removeFile}
                                        />
                                    ))
                                )}
                            </div>
                        </div>
                    </div>

                    <footer className="mt-4 text-center text-xs text-slate-400">
                        Processed locally in your browser. No data uploaded.
                    </footer>
                </div>
            );
        };

        const root = ReactDOM.createRoot(document.getElementById('root'));
        root.render(<App />);
    </script>
</body>
</html>