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+;;; magit-collab.el --- collaboration tools       -*- lexical-binding: t -*-
+
+;; Copyright (C) 2010-2018  The Magit Project Contributors
+;;
+;; You should have received a copy of the AUTHORS.md file which
+;; lists all contributors.  If not, see http://magit.vc/authors.
+
+;; Author: Jonas Bernoulli <jonas@bernoul.li>
+;; Maintainer: Jonas Bernoulli <jonas@bernoul.li>
+
+;; Magit is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; Magit is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+;; License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with Magit.  If not, see http://www.gnu.org/licenses.
+
+;;; Commentary:
+
+;; This library implements various collaboration tools.  These tools
+;; are only early incarnation -- implementing collaboration tools is
+;; a top priority for future development.
+
+;; Currently these tools (including `magit-branch-pull-request', which
+;; is defined elsewhere) only support Github, but support for other
+;; Git forges as well as mailing list based collaboration is in
+;; planning.
+
+;;; Code:
+
+(require 'magit)
+(require 'ghub)
+
+;;; Variables
+
+(defvar magit-github-token-scopes '(repo)
+  "The Github API scopes needed by Magit.
+
+`repo' is the only required scope.  Without this scope none of
+Magit's features that use the API work.  Instead of this scope
+you could use `public_repo' if you are only interested in public
+repositories.
+
+`repo' Grants read/write access to code, commit statuses,
+  invitations, collaborators, adding team memberships, and
+  deployment statuses for public and private repositories
+  and organizations.
+
+`public_repo' Grants read/write access to code, commit statuses,
+  collaborators, and deployment statuses for public repositories
+  and organizations. Also required for starring public
+  repositories.")
+
+;;; Commands
+
+;;;###autoload
+(defun magit-browse-pull-request (pr)
+  "Visit pull-request PR using `browse-url'.
+
+Currently this only supports Github, but that restriction will
+be lifted eventually to support other Git forges."
+  (interactive (list (magit-read-pull-request "Visit pull request")))
+  (browse-url (format "https://github.com/%s/pull/%s"
+                      (--> pr
+                           (cdr (assq 'base it))
+                           (cdr (assq 'repo it))
+                           (cdr (assq 'full_name it)))
+                      (cdr (assq 'number pr)))))
+
+;;; Utilities
+
+(defun magit-read-pull-request (prompt)
+  "Read a pull request from the user, prompting with PROMPT.
+Return the Git forge's API response.  Currently this function
+only supports Github, but that will change eventually."
+  (let* ((origin (magit-upstream-repository))
+         (id     (magit--forge-id origin))
+         (fmtfun (lambda (pull-request)
+                   (format "%s  %s"
+                           (cdr (assq 'number pull-request))
+                           (cdr (assq 'title  pull-request)))))
+         (prs    (ghub-get (format "/repos/%s/pulls" id) nil :auth 'magit))
+         (choice (magit-completing-read
+                  prompt (mapcar fmtfun prs) nil nil nil nil
+                  (let ((default (thing-at-point 'github-pull-request)))
+                    (and default (funcall fmtfun default)))))
+         (number (and (string-match "\\([0-9]+\\)" choice)
+                      (string-to-number (match-string 1 choice)))))
+    (and number
+         ;; Don't reuse the pr from the list, it lacks some information
+         ;; that is only returned when requesting a single pr.  #3371
+         (ghub-get (format "/repos/%s/pulls/%s" id number)
+                   nil :auth 'magit))))
+
+(defun magit-upstream-repository ()
+  "Return the remote name of the upstream repository.
+
+If the Git variable `magit.upstream' is set, then return its
+value.  Otherwise return \"origin\".  If the remote does not
+exist, then raise an error."
+  (let ((remote (or (magit-get "magit.upstream") "origin")))
+    (unless (magit-remote-p remote)
+      (error "No remote named `%s' exists (consider setting `magit.upstream')"
+             remote))
+    (unless (magit--github-remote-p remote)
+      (error "Currently only Github is supported"))
+    remote))
+
+(defun magit--forge-id (remote)
+  (let ((url (magit-get "remote" remote "url")))
+    (and (string-match "\\([^:/]+/[^/]+?\\)\\(?:\\.git\\)?\\'" url)
+         (match-string 1 url))))
+
+(defconst magit--github-url-regexp "\
+\\`\\(?:git://\\|git@\\|ssh://git@\\|https://\\)\
+\\(.*?\\)[/:]\
+\\(\\([^:/]+\\)/\\([^/]+?\\)\\)\
+\\(?:\\.git\\)?\\'")
+
+(defun magit--github-url-p (url)
+  (save-match-data
+    (and url
+         (string-match magit--github-url-regexp url)
+         (let ((host (match-string 1 url)))
+           ;; Match values like "github.com-as-someone", which are
+           ;; translated to just "github.com" according to settings
+           ;; in "~/.ssh/config".  Theoretically this could result
+           ;; in false-positives, but that's rather unlikely.  #3392
+           (and (or (string-match-p (regexp-quote "github.com") host)
+                    (string-match-p (regexp-quote (ghub--host)) host))
+                host)))))
+
+(defun magit--github-remote-p (remote)
+  (or (--when-let (magit-git-string "remote" "get-url" "--push" remote)
+        (magit--github-url-p it))
+      (--when-let (magit-git-string "remote" "get-url" "--all" remote)
+        (magit--github-url-p it))))
+
+(defun magit--github-url-equal (r1 r2)
+  (or (equal r1 r2)
+      (save-match-data
+        (let ((n1 (and (string-match magit--github-url-regexp r1)
+                       (match-string 2 r1)))
+              (n2 (and (string-match magit--github-url-regexp r2)
+                       (match-string 2 r2))))
+          (and n1 n2 (equal n1 n2))))))
+
+(defun magit--pullreq-from-upstream-p (pr)
+  (let-alist pr
+    (equal .head.repo.full_name
+           .base.repo.full_name)))
+
+(defun magit--pullreq-branch (pr &optional assert-new)
+  (let-alist pr
+    (let ((branch .head.ref))
+      (when (and (not (magit--pullreq-from-upstream-p pr))
+                 (or (not .maintainer_can_modify)
+                     (magit-branch-p branch)))
+        (setq branch (format "pr-%s" .number)))
+      (when (and assert-new (magit-branch-p branch))
+        (user-error "Branch `%s' already exists" branch))
+      branch)))
+
+(provide 'magit-collab)
+;;; magit-collab.el ends here