Remove multiline handing attemp, Fix #5

Author: vors

powershell_kernel/powershell_repl.py

@@ -6,16 +6,8 @@
 import re
 from . import subprocess_repl
 
-# PowerShell in interactive mode shows no prompt, so we must hold it by hand.
-# Every command prepended with other command, which will output only one character ('.')
-# When user command leads to no output (for example, 'cd ..'), we get only this character,
-# and then we send command to show prompt explicitly.
-# No output at all means, that PowerShell needs more input (multiline mode).
-# In this case we proceeds sending user input without modifications.
-
 class PowershellRepl(subprocess_repl.SubprocessRepl):
     TYPE = "powershell"
-    PREPENDER = b"."
 
     def __init__(self, encoding, **kwds):
         if not encoding:
@@ -26,42 +18,18 @@ def __init__(self, encoding, **kwds):
                 raise LookupError("Can't detect encoding from chcp")
             encoding = "cp" + chcp_encoding.groups()[0]
             print(encoding)
-
         super(PowershellRepl, self).__init__(encoding, **kwds)
 
-        # Using this to detect whether PowerShell returns some output or it needs more input
-        # PowerShell in interactive mode doesn't show prompt, so we must hold it by hand
-        # It's a hack and, for example, we can send 'Write-Host "" -NoNewLine' with no output, but in outhr cases it may work well
-        self.got_output = True
-        self.multiline = False
-
     def read_bytes(self):
         # this is windows specific problem, that you cannot tell if there
         # are more bytes ready, so we read only 1 at a times
 
         result = super(PowershellRepl, self).read_bytes()
-
-        # Consumes output (it must be equal to PREPENDER)
-        if result and not self.got_output:
-            self.got_output = True
-            self.multiline = False
-            # Don't return PREPENDER, read another input
-            return self.read_bytes()
-
         return result
 
     def write_bytes(self, bytes):
         # Drop flag on new input
-        self.got_output = False
-        if not self.multiline:
-            # Turn multiline mode on, it will be turned off, when PowerShell returns some output
-            self.multiline = True
-            self.prepend()
         self.do_write(bytes)
 
     def do_write(self, bytes):
         super(PowershellRepl, self).write_bytes(bytes)
-
-    def prepend(self):
-        """ Command to prepend every output with special mark to detect multiline mode """
-        self.do_write(b'Write-Host "' + PowershellRepl.PREPENDER + b'" -NoNewLine; ')