telegram-markdown-v2 0.2.0

Transform regular Markdown into Telegram MarkdownV2 (parse_mode = MarkdownV2).
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

use markdown::mdast::{Code, InlineCode, Text};
use regex::Regex;

use crate::errors::{Error, Result};
use crate::types::TextType;
use crate::utils::escape_symbols;

/// Renders plain text with Telegram MarkdownV2 escaping.
pub fn render_text(node: &Text) -> Result<String> {
    Ok(escape_symbols(&node.value, TextType::Text))
}

/// Renders inline code wrapped in backticks with code-context escaping.
pub fn render_inline_code(node: &InlineCode) -> Result<String> {
    Ok(format!("`{}`", escape_symbols(&node.value, TextType::Code)))
}

const SHEBANG_PATTERN: &str = r"^#![a-z]+\n";

/// Renders a fenced code block.
///
/// A leading shebang line is stripped to keep output consistent with Telegram
/// code block rendering.
pub fn render_code(node: &Code) -> Result<String> {
    let re = Regex::new(SHEBANG_PATTERN).map_err(|source| Error::RegexCompile {
        name: "code_block_shebang",
        pattern: SHEBANG_PATTERN,
        source,
    })?;

    let content = re.replace(&node.value, "");
    let escaped_content = escape_symbols(content.as_ref(), TextType::Code);
    Ok(format!("```\n{escaped_content}\n```"))
}