Package with utility functions to manipulate strings/text with full support for ANSI escape sequences (colors, formatting, etc.).

Used heavily in the other packages in this repo (list, progress, and table).

• ANSI Color Support - Full support for terminal colors and formatting
  • Foreground colors (Black, Red, Green, Yellow, Blue, Magenta, Cyan, White)
  • Background colors (matching foreground set)
  • Hi-intensity variants for both foreground and background
  • 256-color palette support - Extended color support for terminals
    • Standard 16 colors (0-15)
    • RGB cube colors (16-231) - 216 colors organized in a 6x6x6 cube
    • Grayscale colors (232-255) - 24 shades of gray
    • Helper functions: Fg256Color(index), Bg256Color(index), Fg256RGB(r, g, b), Bg256RGB(r, g, b)
  • Text attributes (Bold, Faint, Italic, Underline, Blink, Reverse, Concealed, CrossedOut)
  • Automatic color detection based on environment variables (NO_COLOR, FORCE_COLOR, TERM)
  • Global enable/disable functions for colors
  • Cached escape sequences for performance
• Text Formatting - Transform text while preserving escape sequences
  • FormatDefault - No transformation
  • FormatLower - Convert to lowercase
  • FormatTitle - Convert to title case
  • FormatUpper - Convert to uppercase
• HTML Support - Generate HTML class attributes for colors
• Color Combinations - Combine multiple colors and attributes

• Horizontal Alignment
  • AlignDefault / AlignLeft - Left-align text
  • AlignCenter - Center-align text
  • AlignRight - Right-align text
  • AlignJustify - Justify text (distribute spaces between words)
  • AlignAuto - Auto-detect: right-align numbers, left-align text
  • HTML and Markdown property generation for alignment
• Vertical Alignment
  • VAlignTop - Align to top
  • VAlignMiddle - Align to middle
  • VAlignBottom - Align to bottom
  • Works with both string arrays and multi-line strings
  • HTML property generation for vertical alignment

• WrapHard - Hard wrap at specified length, breaks words if needed
  • Handles ANSI escape sequences without breaking formatting
  • Preserves paragraph breaks
• WrapSoft - Soft wrap at specified length, tries to keep words intact
  • Handles ANSI escape sequences without breaking formatting
  • Preserves paragraph breaks
• WrapText - Similar to WrapHard but also respects line breaks
  • Handles ANSI escape sequences without breaking formatting

• Width Calculation
  • StringWidth - Calculate display width of string (including escape sequences)
  • StringWidthWithoutEscSequences - Calculate display width ignoring escape sequences
  • RuneWidth - Calculate display width of a single rune (handles East Asian characters)
  • LongestLineLen - Find the longest line in a multi-line string
• String Manipulation
  • Trim - Trim string to specified length while preserving escape sequences
  • Pad - Pad string to specified length with a character
  • Snip - Snip string to specified length with an indicator (e.g., "~")
  • RepeatAndTrim - Repeat string until it reaches specified length
  • InsertEveryN - Insert a character every N characters
  • ProcessCRLF - Process carriage returns and line feeds correctly
  • Widen - Convert half-width characters to full-width
• Escape Sequence Handling
  • All functions properly handle ANSI escape sequences
  • Escape sequences are preserved during transformations
  • Width calculations ignore escape sequences
  • EscSeqParser - Parser for advanced escape sequence parsing and tracking
    • Supports both CSI (Control Sequence Introducer) and OSI (Operating System Command) formats
    • Tracks active formatting codes and can generate consolidated escape sequences
    • Full support for 256-color escape sequences (\x1b[38;5;nmand\x1b[48;5;nm)

• Move cursor in all directions
  • CursorUp - Move cursor up N lines
  • CursorDown - Move cursor down N lines
  • CursorLeft - Move cursor left N characters
  • CursorRight - Move cursor right N characters
  • EraseLine - Erase all characters to the right of cursor
• Generate ANSI escape sequences for terminal cursor manipulation

• Terminal Hyperlinks - Create clickable hyperlinks in supported terminals
  • Uses OSC 8 escape sequences
  • Format: Hyperlink(url, text)
  • Falls back to plain text in unsupported terminals

• Number Transformer - Format numbers with colors
  • Positive numbers colored green
  • Negative numbers colored red
  • Custom format string support (e.g., %.2f)
  • Supports all numeric types (int, uint, float)
• JSON Transformer - Pretty-print JSON strings or objects
  • Customizable indentation (prefix and indent string)
  • Validates JSON before formatting
• Time Transformer - Format time.Time objects
  • Custom layout support (e.g., time.RFC3339)
  • Timezone localization support
  • Auto-detects common time formats from strings
• Unix Time Transformer - Format Unix timestamps
  • Handles seconds, milliseconds, microseconds, and nanoseconds
  • Auto-detects timestamp unit based on value
  • Timezone localization support
• URL Transformer - Format URLs with styling
  • Underlined and colored blue by default
  • Custom color support

• Bidirectional Text Support
  • LeftToRight - Force left-to-right text direction
  • RightToLeft - Force right-to-left text direction
  • Uses Unicode directional markers

• String Filtering - Filter string slices with custom functions
  • Filter(slice, predicate) - Returns filtered slice

• Proper width calculation for East Asian characters (full-width, half-width)
• Configurable East Asian width handling via OverrideRuneWidthEastAsianWidth()
• Handles mixed character sets correctly