Fix paste magic on Wayland

IPython/core/hooks.py

@@ -155,15 +155,17 @@ def clipboard_get(self):
     """ Get text from the clipboard.
     """
     from ..lib.clipboard import (
-        osx_clipboard_get, tkinter_clipboard_get,
-        win32_clipboard_get
+        osx_clipboard_get,
+        tkinter_clipboard_get,
+        win32_clipboard_get,
+        wayland_clipboard_get,
     )
     if sys.platform == 'win32':
         chain = [win32_clipboard_get, tkinter_clipboard_get]
     elif sys.platform == 'darwin':
         chain = [osx_clipboard_get, tkinter_clipboard_get]
     else:
-        chain = [tkinter_clipboard_get]
+        chain = [wayland_clipboard_get, tkinter_clipboard_get]
     dispatcher = CommandChainDispatcher()
     for func in chain:
         dispatcher.add(func)

IPython/lib/clipboard.py

@@ -1,14 +1,16 @@
 """ Utilities for accessing the platform's clipboard.
 """
-
+import os
 import subprocess
 
 from IPython.core.error import TryNext
 import IPython.utils.py3compat as py3compat
 
+
 class ClipboardEmpty(ValueError):
     pass
 
+
 def win32_clipboard_get():
     """ Get the current clipboard's text on Windows.
 
@@ -32,6 +34,7 @@ def win32_clipboard_get():
         win32clipboard.CloseClipboard()
     return text
 
+
 def osx_clipboard_get() -> str:
     """ Get the clipboard's text on OS X.
     """
@@ -43,6 +46,7 @@ def osx_clipboard_get() -> str:
     text = py3compat.decode(bytes_)
     return text
 
+
 def tkinter_clipboard_get():
     """ Get the clipboard's text using Tkinter.
 
@@ -67,3 +71,31 @@ def tkinter_clipboard_get():
     return text
 
 
+def wayland_clipboard_get():
+    """Get the clipboard's text under Wayland using wl-paste command.
+
+    This requires Wayland and wl-clipboard installed and running.
+    """
+    if os.environ.get("XDG_SESSION_TYPE") != "wayland":
+        raise TryNext("wayland is not detected")
+
+    try:
+        with subprocess.Popen(["wl-paste"], stdout=subprocess.PIPE) as p:
+            raw, err = p.communicate()
+            if p.wait():
+                raise TryNext(err)
+    except FileNotFoundError as e:
+        raise TryNext(
+            "Getting text from the clipboard under Wayland requires the wl-clipboard "
+            "extension: https://github.com/bugaevc/wl-clipboard"
+        ) from e
+
+    if not raw:
+        raise ClipboardEmpty
+
+    try:
+        text = py3compat.decode(raw)
+    except UnicodeDecodeError as e:
+        raise ClipboardEmpty from e
+
+    return text