A snippet using the github public api to get the url and sha of the first commit for a given repo

Get the first commit url.js

// A snippet using the github public api to get
// the url and sha of the first commit for a given repo
function openFirstCommit(userorg, repo) {
  
  return fetch('https://api.github.com/repos/'+userorg+'/'+repo+'/commits')
    .then(obj=>obj.headers.get('link')) 
      // the link header has additional urls for paging
  
    .then(link=>link.split(',')[1].split(';')[0].slice(2,-1))
      // the link contains two urls in the form 
      // <https://github.com/...>; rel=blah, <https://github.com/...>; rel=thelastpage
      // split the url out of the string
  
    .then(pageurl=>fetch(pageurl).then(x=>x.json()))
      // open the url to the last page
  
    .then(commits=>commits[commits.length-1].html_url)
      // navigate to the last commit and extract the userpage url
  
    .then(x=>window.location = x);
      // navigate there
}

Thanks for this! I've improved your snippet to be able to work also on private repos: https://gist.github.com/simonewebdesign/a70f6c89ffd71e6ba4f7dcf7cc74ccf8

Thanks for the issue (FarhadG/init#6), James. I'll incorporate this and update the Init bookmarklet.