detect_links — URL detection in highlighted text

Turns syntax-highlighter output into clickable text. Given the raw content, a set of highlight ranges (with their token scopes), and the already-built TextChunks, detect_links finds URL ranges and stamps the matching chunks with a UrlLink.

pub struct SimpleHighlight(pub usize, pub usize, pub String);  // (start, end, scope/group)

pub fn detect_links(
    chunks: Vec<TextChunk>,
    content: &str,
    highlights: &[SimpleHighlight],
) -> Vec<TextChunk>

How it works

1. Find URL ranges. Highlights whose group is a URL scope ("markup.link.url" or "string.special.url") become URL ranges. Each URL range also pulls in the immediately-preceding "markup.link.label" highlight (the visible link text) as a second range pointing at the same URL.
2. Annotate chunks. The chunks’ text is located back in content (walking forward positionally); any chunk overlapping a URL range gets chunk.link = Some(UrlLink { url }).

Chunks whose text is a single character are skipped (too ambiguous to place), and if no URL ranges were found the chunks are returned untouched.

pub fn detect_links(chunks: Vec<TextChunk>, content: &str, highlights: &[SimpleHighlight]) -> Vec<TextChunk>

Example

use cosh_tui::core::lib::styled_text::{TextChunk, string_to_styled_text};
use cosh_tui::core::lib::detect_links::{detect_links, SimpleHighlight};

let content = "visit https://example.com now";
let chunks = string_to_styled_text(content).chunks;

let linked = detect_links(
    chunks,
    content,
    &[SimpleHighlight(6, 26, "markup.link.url".into())],
);

assert_eq!(linked[0].link.as_ref().map(|l| l.url.as_str()), Some("https://example.com"));

The label pull-in means a [label](url) markdown pair highlights both the label and the URL as the same link target.

Next: terminal_palette — OSC-4 palette detection.