ssh kitten: Allow changing terminal colors when connecting

kittens/ssh/options/definition.py

@@ -103,6 +103,15 @@ value are expanded. The default is empty so no changing is done, which
 usually means the home directory is used.
 ''')
 
+opt('color_scheme', '', long_text='''
+Specify a color scheme to use when connecting to the remote host.  If the
+color_scheme ends with :code:`.conf` it is assumed to be the name of a config
+file to load from the kitty config directory, otherwise it is assumed to be the
+name of a color theme to load via the themes kitten. Note that only colors
+applying to the text/background are changed, other config settings in the .conf
+files/themes are ignored.
+''')
+
 opt('remote_kitty', 'if-needed', choices=('if-needed', 'no', 'yes'), long_text='''
 Make kitty available on the remote server. Useful to run kittens such as the
 icat kitten to display images or the transfer file kitten to transfer files.

kittens/ssh/options/parse.py

@@ -15,6 +15,9 @@ class Parser:
 
     choices_for_askpass = frozenset(('unless-set', 'ssh', 'native'))
 
+    def color_scheme(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['color_scheme'] = str(val)
+
     def copy(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
         for k, v in copy(val, ans["copy"]):
             ans["copy"][k] = v

kittens/ssh/options/types.py

@@ -12,6 +12,7 @@ else:
 
 option_names = (  # {{{
  'askpass',
+ 'color_scheme',
  'copy',
  'cwd',
  'env',
@@ -26,6 +27,7 @@ option_names = (  # {{{
 
 class Options:
     askpass: choices_for_askpass = 'unless-set'
+    color_scheme: str = ''
     cwd: str = ''
     hostname: str = '*'
     interpreter: str = 'sh'