Advanced Writing Configuration

class BibTexWriter:
    """
    Writer to convert a BibDatabase object to a BibTeX-formatted string or file.
    
    Provides extensive configuration options for controlling output formatting
    including field ordering, indentation, alignment, and entry sorting.
    """
    
    def __init__(self, write_common_strings: bool = False):
        """
        Create a configurable BibTeX writer.

        Parameters:
        - write_common_strings (bool): If True, include common string definitions in output

        Attributes that can be configured after initialization:
        - contents (list): Elements to write ['comments', 'preambles', 'strings', 'entries']
        - indent (str): Characters for indenting field-value pairs
        - align_values (bool|int): Align field values by padding with spaces
        - align_multiline_values (bool): Align continuation lines in multiline values
        - entry_separator (str): Characters separating entries
        - order_entries_by (tuple): Fields for sorting entries
        - display_order (list): Preferred field order within entries
        - display_order_sorting (SortingStrategy): How to sort unlisted fields
        - comma_first (bool): Use comma-first syntax
        - add_trailing_comma (bool): Add comma after last field
        """

def write(self, bib_database: BibDatabase) -> str:
    """
    Convert a bibliographic database to a BibTeX-formatted string.

    Parameters:
    - bib_database (BibDatabase): Database to convert

    Returns:
    str: BibTeX-formatted string with all formatting options applied
    """

class SortingStrategy(Enum):
    """Defines sorting strategies for fields not in display_order."""
    
    ALPHABETICAL_ASC = auto()  # Alphabetical sorting in ascending order
    ALPHABETICAL_DESC = auto()  # Alphabetical sorting in descending order  
    PRESERVE = auto()  # Preserve original field order

def to_bibtex(parsed: BibDatabase) -> str:
    """
    Convenience function for backwards compatibility.
    
    Parameters:
    - parsed (BibDatabase): Database to convert
    
    Returns:
    str: BibTeX-formatted string using default writer settings
    """

from bibtexparser.bwriter import BibTexWriter

writer = BibTexWriter()

# Include all elements (default)
writer.contents = ['comments', 'preambles', 'strings', 'entries']

# Only include entries
writer.contents = ['entries']

# Custom order
writer.contents = ['preambles', 'entries', 'comments']

# Custom indentation (default is single space)
writer.indent = '  '  # Two spaces
writer.indent = '\t'  # Tab character

# Align field values
writer.align_values = True  # Auto-calculate alignment width
writer.align_values = 20    # Fixed alignment width
writer.align_values = False # No alignment (default)

# Align multiline values
writer.align_multiline_values = True

# Sort by entry ID (default)
writer.order_entries_by = ('ID',)

# Sort by multiple fields
writer.order_entries_by = ('ENTRYTYPE', 'author', 'year')

# Disable sorting (preserve original order)
writer.order_entries_by = None

from bibtexparser.bwriter import SortingStrategy

# Specify preferred field order
writer.display_order = ['title', 'author', 'journal', 'year']

# Configure how unlisted fields are sorted
writer.display_order_sorting = SortingStrategy.ALPHABETICAL_ASC  # Default
writer.display_order_sorting = SortingStrategy.ALPHABETICAL_DESC
writer.display_order_sorting = SortingStrategy.PRESERVE

# Comma-first syntax (common in functional languages)
writer.comma_first = True  # Default is False

# Add trailing comma after last field
writer.add_trailing_comma = True  # Default is False

# Entry separator (default is newline)
writer.entry_separator = '\n\n'  # Double newline

from bibtexparser.bwriter import BibTexWriter, SortingStrategy

writer = BibTexWriter()
writer.indent = '  '
writer.align_values = True
writer.order_entries_by = ('ENTRYTYPE', 'year', 'author')
writer.display_order = ['title', 'author', 'journal', 'volume', 'pages', 'year']
writer.display_order_sorting = SortingStrategy.ALPHABETICAL_ASC

bibtex_str = writer.write(bib_database)

writer = BibTexWriter()
writer.indent = ''
writer.align_values = False
writer.entry_separator = '\n'
writer.contents = ['entries']  # Only entries, no comments/preambles

bibtex_str = writer.write(bib_database)

writer = BibTexWriter()
writer.comma_first = True
writer.add_trailing_comma = True
writer.indent = '  '

# Output format:
# @article{key
#   , title = {Example}
#   , author = {Author}
#   ,
# }

from bibtexparser.bwriter import BibTexWriter

class CustomBibTexWriter(BibTexWriter):
    def _entry_to_bibtex(self, entry):
        # Override to add custom processing
        # Process entry before writing
        processed_entry = entry.copy()
        
        # Custom field transformations
        if 'doi' in processed_entry:
            processed_entry['doi'] = f"https://doi.org/{processed_entry['doi']}"
            
        return super()._entry_to_bibtex(processed_entry)

writer = CustomBibTexWriter()

from bibtexparser.bwriter import BibTexWriter, SortingStrategy

writer = BibTexWriter(write_common_strings=False)

# Content and structure
writer.contents = ['preambles', 'strings', 'entries', 'comments']
writer.entry_separator = '\n\n'

# Formatting
writer.indent = '    '  # 4 spaces
writer.align_values = 25
writer.align_multiline_values = True

# Entry ordering
writer.order_entries_by = ('ENTRYTYPE', 'year', 'author')

# Field ordering
writer.display_order = [
    'title', 'author', 'editor', 'journal', 'booktitle',
    'volume', 'number', 'pages', 'year', 'publisher', 'address'
]
writer.display_order_sorting = SortingStrategy.ALPHABETICAL_ASC

# Syntax style
writer.comma_first = False
writer.add_trailing_comma = True

# Generate formatted output
formatted_bibtex = writer.write(bib_database)

# Save to file with custom writer
with open('formatted_output.bib', 'w') as f:
    f.write(formatted_bibtex)

# Configuration for journal submission
journal_writer = BibTexWriter()
journal_writer.indent = ' '
journal_writer.align_values = False
journal_writer.order_entries_by = ('author', 'year')
journal_writer.display_order = ['author', 'title', 'journal', 'volume', 'pages', 'year']

# Configuration for personal reference management
personal_writer = BibTexWriter()
personal_writer.indent = '  '
personal_writer.align_values = True
personal_writer.order_entries_by = ('year', 'author')
personal_writer.contents = ['entries']  # No comments for cleaner output