Add pull request support

Back up reporitory pull requests by passing the --include-pulls
argument. Pull requests are saved to
repositories/<repository name>/pulls/<pull request number>.json. Include
the --pull-request-comments argument to add review comments to the pull
request backup and pass the --pull-request-commits argument to add
commits to the pull request backup.

Pull requests are automatically backed up when the --all argument is
uesd.

README.rst

@@ -22,8 +22,9 @@ CLI Usage is as follows::
 
     Github Backup [-h] [-u USERNAME] [-p PASSWORD] [-t TOKEN]
                      [-o OUTPUT_DIRECTORY] [--starred] [--watched] [--all]
-                     [--issues] [--issue-comments] [--issue-events]
-                     [--repositories] [--wikis] [--skip-existing]
+                     [--issues] [--issue-comments] [--issue-events] [--pulls]
+                     [--pull-comments] [--pull-commits] [--repositories]
+                     [--wikis] [--skip-existing]
                      [-L [LANGUAGES [LANGUAGES ...]]] [-N NAME_REGEX]
                      [-H GITHUB_HOST] [-O] [-R REPOSITORY] [-P] [-F] [-v]
                      USER
@@ -49,6 +50,9 @@ CLI Usage is as follows::
       --issues              include issues in backup
       --issue-comments      include issue comments in backup
       --issue-events        include issue events in backup
+      --pulls               include pull requests in backup
+      --pull-comments       include pull request review comments in backup
+      --pull-commits        include pull request commits in backup
       --repositories        include repository clone in backup
       --wikis               include wiki clone in backup
       --skip-existing       skip project if a backup directory exists

bin/github-backup

@@ -88,6 +88,9 @@ def parse_args():
     parser.add_argument('--issues', action='store_true', dest='include_issues', help='include issues in backup')
     parser.add_argument('--issue-comments', action='store_true', dest='include_issue_comments', help='include issue comments in backup')
     parser.add_argument('--issue-events', action='store_true', dest='include_issue_events', help='include issue events in backup')
+    parser.add_argument('--pulls', action='store_true', dest='include_pulls', help='include pull requests in backup')
+    parser.add_argument('--pull-comments', action='store_true', dest='include_pull_comments', help='include pull request review comments in backup')
+    parser.add_argument('--pull-commits', action='store_true', dest='include_pull_commits', help='include pull request commits in backup')
     parser.add_argument('--repositories', action='store_true', dest='include_repository', help='include repository clone in backup')
     parser.add_argument('--wikis', action='store_true', dest='include_wiki', help='include wiki clone in backup')
     parser.add_argument('--skip-existing', action='store_true', dest='skip_existing', help='skip project if a backup directory exists')
@@ -221,10 +224,11 @@ def filter_repositories(args, repositories):
 
 def backup_repositories(args, output_directory, repositories):
     log_info('Backing up repositories')
-    issue_template = 'https://{0}/repos'.format(get_github_api_host(args))
+    repos_template = 'https://{0}/repos'.format(get_github_api_host(args))
     wiki_template = "git@{0}:{1}.wiki.git"
 
     issue_states = ['open', 'closed']
+    pull_states = ['open', 'closed']
     for repository in repositories:
         backup_cwd = os.path.join(output_directory, 'repositories')
         repo_cwd = os.path.join(backup_cwd, repository['name'])
@@ -268,7 +272,7 @@ def backup_repositories(args, output_directory, repositories):
             mkdir_p(backup_cwd, repo_cwd, issue_cwd)
 
             issues = {}
-            _issue_template = '{0}/{1}/issues'.format(issue_template, repository['full_name'])
+            _issue_template = '{0}/{1}/issues'.format(repos_template, repository['full_name'])
 
             for issue_state in issue_states:
                 query_args = {
@@ -292,6 +296,39 @@ def backup_repositories(args, output_directory, repositories):
                 with open('{0}/{1}.json'.format(issue_cwd, number), 'w') as issue_file:
                     json.dump(issue, issue_file, sort_keys=True, indent=4, separators=(',', ': '))
 
+        if args.include_pulls or args.include_everything:
+            if args.skip_existing and os.path.isdir('{0}/pulls/.git'.format(repo_cwd)):
+                continue
+
+            log_info('Retrieving {0} pull requests'.format(repository['full_name']))
+            pulls_cwd = os.path.join(repo_cwd, 'pulls')
+            mkdir_p(backup_cwd, repo_cwd, pulls_cwd)
+
+            pulls = {}
+            _pulls_template = '{0}/{1}/pulls'.format(repos_template, repository['full_name'])
+
+            for pull_state in pull_states:
+                query_args = {
+                    'filter': 'all',
+                    'state': pull_state
+                }
+
+                _pulls = retrieve_data(args, _pulls_template, query_args=query_args)
+                for pull in _pulls:
+                    pulls[pull['number']] = pull
+
+            log_info('Saving {0} pull requests to disk'.format(len(pulls.keys())))
+            for number, pull in pulls.iteritems():
+                comments_template = _pulls_template + '/{0}/comments'
+                commits_template = _pulls_template + '/{0}/commits'
+                if args.include_pull_comments or args.include_everything:
+                    pulls[number]['comment_data'] = retrieve_data(args, comments_template.format(number))
+                if args.include_pull_commits or args.include_everything:
+                    pulls[number]['commit_data'] = retrieve_data(args, commits_template.format(number))
+
+                with open('{0}/{1}.json'.format(pulls_cwd, number), 'w') as pull_file:
+                    json.dump(pull, pull_file, sort_keys=True, indent=4, separators=(',', ': '))
+
 
 def backup_account(args, output_directory):
     account_cwd = os.path.join(output_directory, 'account')