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use std::collections::VecDeque;
use crossterm::style::Stylize;
/// Trait for adding markdown formatting to strings
pub trait Colorful {
fn colorful(&self) -> String;
}
impl Colorful for &str {
fn colorful(&self) -> String {
colorful(self)
}
}
impl Colorful for String {
fn colorful(&self) -> String {
colorful(self)
}
}
/// Converts a string to colored/formatted text with ANSI escape codes.
///
/// Supported syntax:
/// - Bold: `**text**`
/// - Italic: `*text*`
/// - Underline: `_text_`
/// - Angle-bracketed content: `<text>` (displayed as cyan)
/// - Inline code: `` `text` `` (displayed as green)
/// - Color tags: `[[color_name]]` and `[[/]]` to close color
/// - Escape characters: `\*`, `\<`, `\>`, `` \` ``, `\_` for literal characters
///
/// Color tags support the following color names:
/// Color tags support the following color names:
///
/// | Type | Color Names |
/// |-----------------------|-----------------------------------------------------------------------------|
/// | Standard colors | `black`, `red`, `green`, `yellow`, `blue`, `magenta`, `cyan`, `white` |
/// | Bright colors | `bright_black` |
/// | | `bright_red` |
/// | | `bright_green` |
/// | | `bright_yellow` |
/// | | `bright_blue` |
/// | | `bright_magenta` |
/// | | `bright_cyan` |
/// | | `bright_white` |
/// | Bright color shorthands | `b_black` |
/// | | `b_red` |
/// | | `b_green` |
/// | | `b_yellow` |
/// | | `b_blue` |
/// | | `b_magenta` |
/// | | `b_cyan` |
/// | | `b_white` |
/// | Gray colors | `gray`/`grey` |
/// | | `bright_gray`/`bright_grey` |
/// | | `b_gray`/`b_grey` |
///
/// Color tags can be nested, `[[/]]` will close the most recently opened color tag.
///
/// # Arguments
/// * `text` - The text to format, can be any type that implements `AsRef<str>`
///
/// # Returns
/// Returns a `String` containing ANSI escape codes that can display colored/formatted text in ANSI-supported terminals.
///
/// # Examples
/// ```
/// use testing::fmt::colorful;
///
/// let formatted = colorful("Hello **world**!");
/// println!("{}", formatted);
///
/// let colored = colorful("[[red]]Red text[[/]] and normal text");
/// println!("{}", colored);
///
/// let nested = colorful("[[blue]]Blue [[green]]Green[[/]] Blue[[/]] normal");
/// println!("{}", nested);
/// ```
pub fn colorful(text: impl AsRef<str>) -> String {
let text = text.as_ref().trim();
let mut result = String::new();
let mut color_stack: VecDeque<String> = VecDeque::new();
let chars: Vec<char> = text.chars().collect();
let mut i = 0;
while i < chars.len() {
// Check for escape character \
if chars[i] == '\\' && i + 1 < chars.len() {
let escaped_char = chars[i + 1];
// Only escape specific characters
if matches!(escaped_char, '*' | '<' | '>' | '`' | '_') {
let mut escaped_text = escaped_char.to_string();
apply_color_stack(&mut escaped_text, &color_stack);
result.push_str(&escaped_text);
i += 2;
continue;
}
}
// Check for color tag start [[color]]
if i + 1 < chars.len() && chars[i] == '[' && chars[i + 1] == '[' {
if let Some(end) = find_tag_end(&chars, i) {
let tag_content: String = chars[i + 2..end].iter().collect();
// Check if it's a closing tag [[/]]
if tag_content == "/" {
color_stack.pop_back();
} else {
// It's a color tag
color_stack.push_back(tag_content.clone());
}
i = end + 2;
continue;
}
}
// Check for bold **text**
if i + 1 < chars.len() && chars[i] == '*' && chars[i + 1] == '*' {
if let Some(end) = find_matching(&chars, i + 2, "**") {
let bold_text: String = chars[i + 2..end].iter().collect();
let mut formatted_text = bold_text.bold().to_string();
apply_color_stack(&mut formatted_text, &color_stack);
result.push_str(&formatted_text);
i = end + 2;
continue;
}
}
// Check for italic *text*
if chars[i] == '*' {
if let Some(end) = find_matching(&chars, i + 1, "*") {
let italic_text: String = chars[i + 1..end].iter().collect();
let mut formatted_text = italic_text.italic().to_string();
apply_color_stack(&mut formatted_text, &color_stack);
result.push_str(&formatted_text);
i = end + 1;
continue;
}
}
// Check for underline _text_
if chars[i] == '_' {
if let Some(end) = find_matching(&chars, i + 1, "_") {
let underline_text: String = chars[i + 1..end].iter().collect();
let mut formatted_text = format!("\x1b[4m{}\x1b[0m", underline_text);
apply_color_stack(&mut formatted_text, &color_stack);
result.push_str(&formatted_text);
i = end + 1;
continue;
}
}
// Check for angle-bracketed content <text>
if chars[i] == '<' {
if let Some(end) = find_matching(&chars, i + 1, ">") {
// Include the angle brackets in the output
let angle_text: String = chars[i..=end].iter().collect();
let mut formatted_text = angle_text.cyan().to_string();
apply_color_stack(&mut formatted_text, &color_stack);
result.push_str(&formatted_text);
i = end + 1;
continue;
}
}
// Check for inline code `text`
if chars[i] == '`' {
if let Some(end) = find_matching(&chars, i + 1, "`") {
// Include the backticks in the output
let code_text: String = chars[i..=end].iter().collect();
let mut formatted_text = code_text.green().to_string();
apply_color_stack(&mut formatted_text, &color_stack);
result.push_str(&formatted_text);
i = end + 1;
continue;
}
}
// Regular character
let mut current_char = chars[i].to_string();
apply_color_stack(&mut current_char, &color_stack);
result.push_str(¤t_char);
i += 1;
}
result
}
// Helper function to find matching delimiter
fn find_matching(chars: &[char], start: usize, delimiter: &str) -> Option<usize> {
let delim_chars: Vec<char> = delimiter.chars().collect();
let delim_len = delim_chars.len();
let mut j = start;
while j < chars.len() {
if delim_len == 1 {
if chars[j] == delim_chars[0] {
return Some(j);
}
} else if j + 1 < chars.len()
&& chars[j] == delim_chars[0]
&& chars[j + 1] == delim_chars[1]
{
return Some(j);
}
j += 1;
}
None
}
// Helper function to find color tag end
fn find_tag_end(chars: &[char], start: usize) -> Option<usize> {
let mut j = start + 2;
while j + 1 < chars.len() {
if chars[j] == ']' && chars[j + 1] == ']' {
return Some(j);
}
j += 1;
}
None
}
// Helper function to apply color stack to text
fn apply_color_stack(text: &mut String, color_stack: &VecDeque<String>) {
let mut result = text.clone();
for color in color_stack.iter().rev() {
result = apply_color(&result, color);
}
*text = result;
}
// Helper function to apply color to text
fn apply_color(text: impl AsRef<str>, color_name: impl AsRef<str>) -> String {
let text = text.as_ref();
let color_name = color_name.as_ref();
match color_name {
// Normal colors
"black" => text.dark_grey().to_string(),
"red" => text.dark_red().to_string(),
"green" => text.dark_green().to_string(),
"yellow" => text.dark_yellow().to_string(),
"blue" => text.dark_blue().to_string(),
"magenta" => text.dark_magenta().to_string(),
"cyan" => text.dark_cyan().to_string(),
"white" => text.white().to_string(),
"bright_black" => text.black().to_string(),
"bright_red" => text.red().to_string(),
"bright_green" => text.green().to_string(),
"bright_yellow" => text.yellow().to_string(),
"bright_blue" => text.blue().to_string(),
"bright_magenta" => text.magenta().to_string(),
"bright_cyan" => text.cyan().to_string(),
"bright_white" => text.white().to_string(),
// Short aliases for bright colors
"b_black" => text.black().to_string(),
"b_red" => text.red().to_string(),
"b_green" => text.green().to_string(),
"b_yellow" => text.yellow().to_string(),
"b_blue" => text.blue().to_string(),
"b_magenta" => text.magenta().to_string(),
"b_cyan" => text.cyan().to_string(),
"b_white" => text.white().to_string(),
// Gray colors using truecolor
"gray" | "grey" => text.grey().to_string(),
"bright_gray" | "bright_grey" => text.white().to_string(),
"b_gray" | "b_grey" => text.white().to_string(),
// Default to white if color not recognized
_ => text.to_string(),
}
}
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