Reintroduce $ https command alias with https:// as default scheme

Close #608

tests/test_cli.py

@@ -342,6 +342,10 @@ class TestSchemes:
         with pytest.raises(InvalidSchema):
             http('bah', '--default=scheme=foo+bar-BAZ.123')
 
-    def test_default_scheme(self, httpbin_secure):
+    def test_default_scheme_option(self, httpbin_secure):
         url = '{0}:{1}'.format(httpbin_secure.host, httpbin_secure.port)
         assert HTTP_OK in http(url, '--default-scheme=https')
+
+    def test_scheme_when_invoked_as_https(self, httpbin_secure):
+        url = '{0}:{1}'.format(httpbin_secure.host, httpbin_secure.port)
+        assert HTTP_OK in http(url, program_name='https')

tests/test_errors.py

@@ -20,7 +20,7 @@ def test_error(get_response):
     exc = ConnectionError('Connection aborted')
     exc.request = Request(method='GET', url='http://www.google.com')
     get_response.side_effect = exc
-    ret = main(['--ignore-stdin', 'www.google.com'], custom_log_error=error)
+    ret = main(['http', '--ignore-stdin', 'www.google.com'], custom_log_error=error)
     assert ret == ExitStatus.ERROR
     assert error_msg == (
         'ConnectionError: '
@@ -34,7 +34,7 @@ def test_error_traceback(get_response):
     exc.request = Request(method='GET', url='http://www.google.com')
     get_response.side_effect = exc
     with raises(ConnectionError):
-        main(['--ignore-stdin', '--traceback', 'www.google.com'])
+        main(['http', '--ignore-stdin', '--traceback', 'www.google.com'])
 
 
 def test_max_headers_limit(httpbin_both):

tests/utils.py

@@ -140,7 +140,7 @@ class ExitStatusError(Exception):
     pass
 
 
-def http(*args, **kwargs):
+def http(*args, program_name='http', **kwargs):
     # noinspection PyUnresolvedReferences
     """
     Run HTTPie and capture stderr/out and exit status.
@@ -197,7 +197,8 @@ def http(*args, **kwargs):
             add_to_args.append('--traceback')
         if not any('--timeout' in arg for arg in args_with_config_defaults):
             add_to_args.append('--timeout=3')
-    args = add_to_args + args
+
+    complete_args = [program_name, *add_to_args, *args]
 
     def dump_stderr():
         stderr.seek(0)
@@ -205,7 +206,7 @@ def http(*args, **kwargs):
 
     try:
         try:
-            exit_status = main(args=args, **kwargs)
+            exit_status = main(args=complete_args, **kwargs)
             if '--download' in args:
                 # Let the progress reporter thread finish.
                 time.sleep(.5)