Custom function for the Obsidian Templater plugin (https://github.com/SilentVoid13/Templater/) to convert a github issue URL to a link with the issue title. Only works for public repos.

gh_title.js

async function getGitHubIssueTitle(owner, repo, issueNumber) {
  const url = `https://api.github.com/repos/${owner}/${repo}/issues/${issueNumber}`;

  const response = await fetch(url);
  if (!response.ok) {
    throw new Error(`Error fetching issue: ${response.status}`);
  }

  const issueData = await response.json();

  return issueData.title;  // Return or use the title as needed
}

function parseGitHubIssueUrl(url) {
  const parsedUrl = new URL(url);

  // Ensure it's a valid GitHub issue URL
  if (parsedUrl.hostname !== 'github.com') {
    throw new Error('Not a valid GitHub URL');
  }

  const pathParts = parsedUrl.pathname.split('/');

  // Validate if the URL has the right structure
  if (pathParts.length < 5 || !pathParts[3].match(/issues|pulls?/)) {
    throw new Error('URL structure is incorrect for a GitHub issue');
  }

  // Extract owner, repo, and issue number
  const owner = pathParts[1];
  const repo = pathParts[2];
  const issueNumber = pathParts[4];

  return { owner, repo, issueNumber };
}

async function gh_title(url) {
  let owner, repo, issueNumber;
  try {
    ({owner, repo, issueNumber} = parseGitHubIssueUrl(url));
  } catch (error) {
    console.log(`Error parsing github link for ${url}: ${error}`);

    return `[${url}](${url})`
  }

  try {
    const title = await getGitHubIssueTitle(owner, repo, issueNumber);
    return `[${title} (#${issueNumber})](${url})`;
  } catch (error) {
    console.log(`Error getting github issue title for ${url}: ${error}`);

    return `[${owner}/${repo}#${issueNumber}](${url})`
  }
}

module.exports = gh_title;

🐙 Github link.md

<% tp.user.gh_title(tp.file.selection()) %>

Installation:
Install as a user script. The js file should go in your 'scripts' directory. The .md file should go in your templates directory.

Usage:

1. Paste a link to a github issue in your file (eg 'SilentVoid13/Templater#9')
2. Highlight the text. Open the templater panel ('<%' symbol) and choose '🐙 Github link'

It should replace the highlighted text with [Emoji's are not supportet (#9)](https://github.com/SilentVoid13/Templater/issues/9)

If something goes wrong fetching the title from github it will use a format like [SilentVoid13/Templater#9](https://github.com/SilentVoid13/Templater/issues/9)