Start work on unicode input kitten

kittens/tui/loop.py

@@ -137,7 +137,7 @@ class Loop:
             self.iov_limit = os.sysconf('SC_IOV_MAX') - 1
         except Exception:
             self.iov_limit = 255
-        self.parse_input_from_terminal = partial(parse_input_from_terminal, self._on_text, self._on_dcs, self._on_csi, self.on_osc, self._on_pm, self._on_apc)
+        self.parse_input_from_terminal = partial(parse_input_from_terminal, self._on_text, self._on_dcs, self._on_csi, self._on_osc, self._on_pm, self._on_apc)
         self.ebs_pat = re.compile('([\177\r\x03\x04])')
         self.in_bracketed_paste = False
         self.sanitize_bracketed_paste = bool(sanitize_bracketed_paste)
@@ -202,6 +202,9 @@ class Loop:
     def _on_pm(self, pm):
         pass
 
+    def _on_osc(self, osc):
+        pass
+
     def _on_apc(self, apc):
         if apc.startswith('K'):
             try:
@@ -272,6 +275,12 @@ class Loop:
     def wakeup(self):
         self._wakeup_write(b'1')
 
+    def _modify_output_selector(self, waiting_for_write):
+        if waiting_for_write:
+            self.sel.register(self.output_fd, selectors.EVENT_WRITE)
+        else:
+            self.sel.unregister(self.output_fd)
+
     def loop(self, handler):
         select = self.sel.select
         tb = None
@@ -288,10 +297,7 @@ class Loop:
                     break
                 if has_data_to_write != waiting_for_write:
                     waiting_for_write = has_data_to_write
-                    self.sel.modify(
-                        self.output_fd, selectors.EVENT_WRITE
-                        if waiting_for_write else 0, self._write_ready
-                    )
+                    self._modify_output_selector(waiting_for_write)
                 events = select()
                 for key, mask in events:
                     try:
@@ -316,10 +322,7 @@ class Loop:
                 break
             if has_data_to_write != waiting_for_write:
                 waiting_for_write = has_data_to_write
-                self.sel.modify(
-                    self.output_fd, selectors.EVENT_WRITE
-                    if waiting_for_write else 0, self._write_ready
-                )
+                self._modify_output_selector(waiting_for_write)
             events = select()
             for key, mask in events:
                 key.data(handler)

kittens/tui/operations.py

@@ -2,6 +2,8 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
+from kitty.terminfo import string_capabilities
+
 S7C1T = b'\033 F'
 SAVE_CURSOR = b'\0337'
 RESTORE_CURSOR = b'\0338'
@@ -40,6 +42,10 @@ def reset_mode(which):
     return '\033[{}{}l'.format(private, num).encode('ascii')
 
 
+def clear_screen():
+    return string_capabilities['clear'].replace(r'\E', '\033').encode('ascii')
+
+
 def init_state(alternate_screen=True):
     ans = (
         S7C1T + SAVE_CURSOR + SAVE_PRIVATE_MODE_VALUES + reset_mode('LNM') +
@@ -53,6 +59,7 @@ def init_state(alternate_screen=True):
     )
     if alternate_screen:
         ans += set_mode('ALTERNATE_SCREEN')
+        ans += clear_screen()
     return ans
 
 

kittens/unicode_input/main.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
+
+import sys
+
+from ..tui.handler import Handler
+from ..tui.loop import Loop
+
+
+class UnicodeInput(Handler):
+
+    def initialize(self, *args):
+        Handler.initialize(self, *args)
+        self.write('Testing 123...')
+
+    def on_interrupt(self):
+        self.quit_loop(1)
+
+    def on_eot(self):
+        self.quit_loop(1)
+
+
+def main(args=sys.argv):
+    loop = Loop()
+    handler = UnicodeInput()
+    loop.loop(handler)