Create app.py

app.py

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+import streamlit as st
+import subprocess
+import tempfile
+import base64
+from pathlib import Path
+import os
+
+# Set page configuration
+st.set_page_config(page_title="LaTeX Editor & Compiler", page_icon="📝", layout="wide")
+
+# Function to convert LaTeX to PDF
+def latex_to_pdf(latex_code):
+    with tempfile.TemporaryDirectory() as temp_dir:
+        temp_path = Path(temp_dir)
+        tex_file = temp_path / "document.tex"
+        pdf_file = temp_path / "document.pdf"
+        
+        # Write LaTeX code to file
+        with open(tex_file, "w") as f:
+            f.write(latex_code)
+        
+        try:
+            # Run pdflatex to compile the LaTeX file
+            process = subprocess.run(
+                ["pdflatex", "-interaction=nonstopmode", "-output-directory", temp_dir, str(tex_file)],
+                capture_output=True,
+                text=True
+            )
+            
+            # Check if PDF was created
+            if pdf_file.exists():
+                with open(pdf_file, "rb") as file:
+                    pdf_data = file.read()
+                return pdf_data, process.stdout, process.stderr
+            else:
+                return None, process.stdout, process.stderr
+        except Exception as e:
+            return None, "", str(e)
+
+# Function to display PDF
+def display_pdf(pdf_data):
+    base64_pdf = base64.b64encode(pdf_data).decode('utf-8')
+    pdf_display = f"""
+        <iframe
+            src="data:application/pdf;base64,{base64_pdf}"
+            width="100%"
+            height="600"
+            style="border: none;"
+        ></iframe>
+    """
+    st.markdown(pdf_display, unsafe_allow_html=True)
+
+# Function to create download link for PDF
+def get_download_link(pdf_data, filename="document.pdf"):
+    b64_pdf = base64.b64encode(pdf_data).decode()
+    return f'<a href="data:application/pdf;base64,{b64_pdf}" download="{filename}" class="download-button">Download PDF</a>'
+
+# LaTeX package reference
+latex_packages = {
+    "Document": {
+        "\\usepackage{geometry}": "Page layout customization",
+        "\\usepackage{fancyhdr}": "Custom headers and footers",
+        "\\usepackage{titlesec}": "Title formatting",
+        "\\usepackage{hyperref}": "Hyperlinks and PDF metadata"
+    },
+    "Math": {
+        "\\usepackage{amsmath}": "Enhanced math formatting",
+        "\\usepackage{amssymb}": "Mathematical symbols",
+        "\\usepackage{mathtools}": "Extensions to amsmath",
+        "\\usepackage{physics}": "Physics notation"
+    },
+    "Graphics": {
+        "\\usepackage{graphicx}": "Include images",
+        "\\usepackage{tikz}": "Create vector graphics",
+        "\\usepackage{pgfplots}": "Create plots",
+        "\\usepackage{float}": "Better figure placement"
+    },
+    "Tables": {
+        "\\usepackage{tabularx}": "Flexible tables",
+        "\\usepackage{booktabs}": "Professional tables",
+        "\\usepackage{colortbl}": "Colored tables",
+        "\\usepackage{multirow}": "Multi-row cells"
+    },
+    "Content": {
+        "\\usepackage{listings}": "Code syntax highlighting",
+        "\\usepackage{minted}": "Advanced code highlighting",
+        "\\usepackage{biblatex}": "Bibliography management",
+        "\\usepackage{xcolor}": "Color support"
+    }
+}
+
+# LaTeX commands reference
+latex_commands = {
+    "Document Structure": {
+        "\\documentclass{article}": "Specifies the type of document",
+        "\\begin{document}": "Starts the document content",
+        "\\end{document}": "Ends the document content",
+        "\\title{...}": "Sets the document title",
+        "\\author{...}": "Sets the document author",
+        "\\date{...}": "Sets the document date",
+        "\\maketitle": "Prints the title, author, and date"
+    },
+    "Sections": {
+        "\\section{...}": "Creates a section",
+        "\\subsection{...}": "Creates a subsection",
+        "\\subsubsection{...}": "Creates a subsubsection",
+        "\\paragraph{...}": "Creates a paragraph heading",
+        "\\tableofcontents": "Generates a table of contents"
+    },
+    "Text Formatting": {
+        "\\textbf{...}": "Bold text",
+        "\\textit{...}": "Italic text",
+        "\\underline{...}": "Underlined text",
+        "\\emph{...}": "Emphasized text",
+        "\\texttt{...}": "Typewriter text",
+        "\\textsc{...}": "Small caps text",
+        "\\textsf{...}": "Sans-serif text",
+        "\\color{red}{...}": "Colored text (requires xcolor)"
+    },
+    "Math": {
+        "$...$": "Inline math mode",
+        "$$...$$": "Display math mode",
+        "\\begin{equation}...\\end{equation}": "Numbered equation",
+        "\\begin{align}...\\end{align}": "Aligned equations",
+        "\\frac{num}{denom}": "Fraction",
+        "\\dfrac{num}{denom}": "Display fraction",
+        "\\sqrt{...}": "Square root",
+        "\\sqrt[n]{...}": "nth root",
+        "\\sum_{lower}^{upper}": "Summation",
+        "\\prod_{lower}^{upper}": "Product",
+        "\\int_{lower}^{upper}": "Integral",
+        "\\lim_{x \\to value}": "Limit",
+        "\\vec{...}": "Vector",
+        "\\overline{...}": "Overline",
+        "\\hat{...}": "Hat accent",
+        "\\partial": "Partial derivative"
+    },
+    "Lists": {
+        "\\begin{itemize}...\\end{itemize}": "Bulleted list",
+        "\\begin{enumerate}...\\end{enumerate}": "Numbered list",
+        "\\begin{description}...\\end{description}": "Description list",
+        "\\item": "List item",
+        "\\item[custom]": "Custom label item"
+    },
+    "Tables": {
+        "\\begin{table}...\\end{table}": "Table environment",
+        "\\begin{tabular}{cols}...\\end{tabular}": "Create a table",
+        "\\hline": "Horizontal line in table",
+        "\\cline{i-j}": "Partial horizontal line",
+        "cell1 & cell2 & cell3 \\\\": "Table row",
+        "\\multicolumn{n}{align}{content}": "Span multiple columns"
+    },
+    "Figures": {
+        "\\begin{figure}...\\end{figure}": "Figure environment",
+        "\\includegraphics[width=0.8\\textwidth]{filename}": "Include an image",
+        "\\caption{...}": "Add a caption to a figure or table",
+        "\\label{...}": "Add a label for cross-referencing",
+        "\\ref{...}": "Reference a labeled item"
+    },
+    "Citations": {
+        "\\cite{key}": "Citation",
+        "\\bibliography{file}": "Bibliography source",
+        "\\bibliographystyle{style}": "Bibliography style"
+    }
+}
+
+# Default LaTeX template
+default_template = r"""\documentclass{article}
+\usepackage[utf8]{inputenc}
+\usepackage{amsmath}
+\usepackage{amssymb}
+\usepackage{graphicx}
+\usepackage{hyperref}
+
+\title{LaTeX Document}
+\author{Your Name}
+\date{\today}
+
+\begin{document}
+
+\maketitle
+
+\section{Introduction}
+Your introduction here. Insert some text to demonstrate LaTeX.
+
+\section{Mathematical Expressions}
+\subsection{Equations}
+The famous Einstein's equation:
+\begin{equation}
+    E = mc^2
+\end{equation}
+
+The quadratic formula:
+\begin{equation}
+    x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
+\end{equation}
+
+\subsection{Calculus}
+An integral example:
+\begin{equation}
+    \int_{0}^{\pi} \sin(x) \, dx = 2
+\end{equation}
+
+\section{Lists and Items}
+\subsection{Bullet Points}
+\begin{itemize}
+    \item First item
+    \item Second item
+    \item Third item
+\end{itemize}
+
+\subsection{Numbered List}
+\begin{enumerate}
+    \item First step
+    \item Second step
+    \item Third step
+\end{enumerate}
+
+\section{Tables}
+\begin{table}[h]
+    \centering
+    \begin{tabular}{|c|c|c|}
+        \hline
+        Cell 1 & Cell 2 & Cell 3 \\
+        \hline
+        Data 1 & Data 2 & Data 3 \\
+        \hline
+    \end{tabular}
+    \caption{A simple table}
+    \label{tab:simple}
+\end{table}
+
+\section{Conclusion}
+Your conclusion here.
+
+\end{document}
+"""
+
+# Add custom CSS
+st.markdown("""
+<style>
+    .editor-container {
+        border: 1px solid #ccc;
+        border-radius: 5px;
+        padding: 10px;
+        background-color: #f8f9fa;
+    }
+    .download-button {
+        display: inline-block;
+        padding: 0.5em 1em;
+        background-color: #4CAF50;
+        color: white !important;
+        text-align: center;
+        text-decoration: none;
+        font-size: 16px;
+        border-radius: 4px;
+        transition: background-color 0.3s;
+        margin-top: 10px;
+    }
+    .download-button:hover {
+        background-color: #45a049;
+    }
+    .stTextArea textarea {
+        font-family: 'Courier New', Courier, monospace !important;
+        font-size: 14px !important;
+        line-height: 1.5 !important;
+    }
+    .latex-command {
+        background-color: #f1f1f1;
+        padding: 2px 4px;
+        border-radius: 3px;
+        font-family: monospace;
+        cursor: pointer;
+    }
+    .reference-tabs .stTabs {
+        background-color: #f5f5f5;
+        border-radius: 5px;
+        padding: 10px;
+    }
+    .stMarkdown h4 {
+        margin-top: 0.5rem !important;
+        margin-bottom: 0.5rem !important;
+    }
+    .command-category {
+        margin-bottom: 15px !important;
+    }
+</style>
+""", unsafe_allow_html=True)
+
+# JavaScript for copying commands to editor
+st.markdown("""
+<script>
+function copyToEditor(text) {
+    const textareas = document.getElementsByTagName('textarea');
+    if (textareas.length > 0) {
+        const editor = textareas[0];
+        const start = editor.selectionStart;
+        const end = editor.selectionEnd;
+        const value = editor.value;
+        editor.value = value.substring(0, start) + text + value.substring(end);
+        editor.selectionStart = editor.selectionEnd = start + text.length;
+        editor.focus();
+    }
+}
+</script>
+""", unsafe_allow_html=True)
+
+# Main application
+def main():
+    st.title("LaTeX Editor & PDF Compiler")
+    
+    # Create layout with sidebar
+    col1, col2 = st.columns([3, 2])
+    
+    with col1:
+        st.subheader("LaTeX Editor")
+        
+        # Initialize session state
+        if 'latex_code' not in st.session_state:
+            st.session_state.latex_code = default_template
+        
+        # LaTeX editor
+        latex_code = st.text_area(
+            "Edit your LaTeX document:",
+            value=st.session_state.latex_code,
+            height=500,
+            key="latex_editor"
+        )
+        st.session_state.latex_code = latex_code
+        
+        # Control buttons
+        col1_1, col1_2, col1_3 = st.columns(3)
+        
+        with col1_1:
+            if st.button("Compile PDF", use_container_width=True):
+                st.session_state.compile_clicked = True
+        
+        with col1_2:
+            if st.button("Load Template", use_container_width=True):
+                st.session_state.latex_code = default_template
+                st.rerun()
+        
+        with col1_3:
+            if st.button("Clear Editor", use_container_width=True):
+                st.session_state.latex_code = ""
+                st.rerun()
+    
+    with col2:
+        st.subheader("PDF Preview")
+        
+        # PDF preview
+        if 'compile_clicked' in st.session_state and st.session_state.compile_clicked:
+            with st.spinner("Compiling LaTeX to PDF..."):
+                pdf_data, stdout, stderr = latex_to_pdf(latex_code)
+                
+                if pdf_data:
+                    st.session_state.pdf_data = pdf_data
+                    display_pdf(pdf_data)
+                    
+                    # Download button
+                    st.markdown(get_download_link(pdf_data), unsafe_allow_html=True)
+                    st.session_state.compile_clicked = False
+                else:
+                    st.error("Compilation Error")
+                    with st.expander("Error Details"):
+                        st.text(stdout)
+                        st.text(stderr)
+                    st.session_state.compile_clicked = False
+        
+        # Display previous PDF if available
+        elif 'pdf_data' in st.session_state and st.session_state.pdf_data:
+            display_pdf(st.session_state.pdf_data)
+            st.markdown(get_download_link(st.session_state.pdf_data), unsafe_allow_html=True)
+        else:
+            st.info("Compile your LaTeX document to see the PDF preview")
+    
+    # LaTeX Reference Sidebar
+    st.sidebar.title("LaTeX Reference")
+    
+    # Search functionality
+    search_query = st.sidebar.text_input("Search commands or packages", "")
+    
+    if search_query:
+        st.sidebar.subheader("Search Results")
+        found = False
+        
+        # Search commands
+        for category, commands in latex_commands.items():
+            filtered_commands = {cmd: desc for cmd, desc in commands.items() 
+                             if search_query.lower() in cmd.lower() or search_query.lower() in desc.lower()}
+            
+            if filtered_commands:
+                found = True
+                with st.sidebar.expander(f"{category} ({len(filtered_commands)} results)"):
+                    for cmd, desc in filtered_commands.items():
+                        st.markdown(f"<div class='latex-command' onclick=\"copyToEditor('{cmd}')\">{cmd}</div> - {desc}", unsafe_allow_html=True)
+        
+        # Search packages
+        for category, packages in latex_packages.items():
+            filtered_packages = {pkg: desc for pkg, desc in packages.items() 
+                              if search_query.lower() in pkg.lower() or search_query.lower() in desc.lower()}
+            
+            if filtered_packages:
+                found = True
+                with st.sidebar.expander(f"Packages: {category} ({len(filtered_packages)} results)"):
+                    for pkg, desc in filtered_packages.items():
+                        st.markdown(f"<div class='latex-command' onclick=\"copyToEditor('{pkg}')\">{pkg}</div> - {desc}", unsafe_allow_html=True)
+        
+        if not found:
+            st.sidebar.info("No matching commands or packages found")
+    
+    else:
+        # Display full reference when not searching
+        tabs = st.sidebar.tabs(["Commands", "Packages"])
+        
+        with tabs[0]:
+            for category, commands in latex_commands.items():
+                with st.expander(category):
+                    for cmd, desc in commands.items():
+                        st.markdown(f"<div class='latex-command' onclick=\"copyToEditor('{cmd}')\">{cmd}</div> - {desc}", unsafe_allow_html=True)
+        
+        with tabs[1]:
+            for category, packages in latex_packages.items():
+                with st.expander(category):
+                    for pkg, desc in packages.items():
+                        st.markdown(f"<div class='latex-command' onclick=\"copyToEditor('{pkg}')\">{pkg}</div> - {desc}", unsafe_allow_html=True)
+
+if __name__ == "__main__":
+    main()