Add key bindings to consistently move up and down in history (#1084)

AUTHORS

@@ -99,6 +99,7 @@ Contributors:
     * Alexander Zawadzki
     * Pablo A. Bianchi (pabloab)
     * Sebastian Janko (sebojanko)
+    * Pedro Ferrari (petobens)
 
 Creator:
 --------

changelog.rst

@@ -11,6 +11,7 @@ Bug fixes:
 
 * Error connecting to PostgreSQL 12beta1 (#1058). (Thanks: `Irina Truong`_)
 * Empty query caused error message (Thanks: `Sebastian Janko`_)
+* History navigation bindings in multiline queries (#1004) (Thanks: `Pedro Ferrari`_)
 
 2.1.1
 =====
@@ -995,3 +996,4 @@ Improvements:
 .. _`Telmo "Trooper"`: https://github.com/telmotrooper
 .. _`Alexander Zawadzki`: https://github.com/zadacka
 .. _`Sebastian Janko`: https://github.com/sebojanko
+.. _`Pedro Ferrari`: https://github.com/petobens

pgcli/key_bindings.py

@@ -3,7 +3,11 @@ from __future__ import unicode_literals
 import logging
 from prompt_toolkit.enums import EditingMode
 from prompt_toolkit.key_binding import KeyBindings
-from prompt_toolkit.filters import completion_is_selected, has_completions
+from prompt_toolkit.filters import (
+    completion_is_selected,
+    has_completions,
+    has_selection,
+)
 
 _logger = logging.getLogger(__name__)
 
@@ -96,4 +100,14 @@ def pgcli_bindings(pgcli):
         _logger.debug("Detected alt-enter key.")
         event.app.current_buffer.insert_text("\n")
 
+    @kb.add("c-p", filter=~has_selection)
+    def _(event):
+        """Move up in history."""
+        event.current_buffer.history_backward(count=event.arg)
+
+    @kb.add("c-n", filter=~has_selection)
+    def _(event):
+        """Move down in history."""
+        event.current_buffer.history_forward(count=event.arg)
+
     return kb