console: teach keymap to understand "space"

Urwid uses " ", which is not a great user experience.

mitmproxy/tools/console/defaultkeys.py

@@ -20,7 +20,7 @@ def map(km):
     km.add("h", "console.nav.left", ["global"], "Left")
     km.add("tab", "console.nav.next", ["global"], "Next")
     km.add("enter", "console.nav.select", ["global"], "Select")
-    km.add(" ", "console.nav.pagedown", ["global"], "Page down")
+    km.add("space", "console.nav.pagedown", ["global"], "Page down")
     km.add("ctrl f", "console.nav.pagedown", ["global"], "Page down")
     km.add("ctrl b", "console.nav.pageup", ["global"], "Page up")
 
@@ -102,7 +102,7 @@ def map(km):
         "Toggle viewing full contents on this flow",
     )
     km.add("w", "console.command save.file @focus ", ["flowview"], "Save flow to file")
-    km.add(" ", "view.focus.next", ["flowview"], "Go to next flow")
+    km.add("space", "view.focus.next", ["flowview"], "Go to next flow")
 
     km.add(
         "v",

mitmproxy/tools/console/keymap.py

@@ -1,5 +1,4 @@
 import typing
-import collections
 from mitmproxy.tools.console import commandeditor
 
 
@@ -16,10 +15,17 @@ SupportedContexts = {
 }
 
 
-Binding = collections.namedtuple(
-    "Binding",
-    ["key", "command", "contexts", "help"]
-)
+class Binding:
+    def __init__(self, key, command, contexts, help):
+        self.key, self.command, self.contexts = key, command, contexts
+        self.help = help
+
+    def keyspec(self):
+        """
+            Translate the key spec from a convenient user specification to one
+            Urwid understands.
+        """
+        return self.key.replace("space", " ")
 
 
 class Keymap:
@@ -46,7 +52,7 @@ class Keymap:
     def bind(self, binding):
         for c in binding.contexts:
             d = self.keys.setdefault(c, {})
-            d[binding.key] = binding.command
+            d[binding.keyspec()] = binding.command
 
     def get(self, context: str, key: str) -> typing.Optional[str]:
         if context in self.keys:

test/mitmproxy/tools/console/test_keymap.py

@@ -4,6 +4,11 @@ from unittest import mock
 import pytest
 
 
+def test_binding():
+    b = keymap.Binding("space", "cmd", ["options"], "")
+    assert b.keyspec() == " "
+
+
 def test_bind():
     with taddons.context() as tctx:
         km = keymap.Keymap(tctx.master)