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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 17:35:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 17:35:20 +0000
commite106bf94eff07d9a59771d9ccc4406421e18ab64 (patch)
treeedb6545500e39df9c67aa918a6125bffc8ec1aee /examples/prompts/history/slow-history.py
parentInitial commit. (diff)
downloadprompt-toolkit-upstream/3.0.36.tar.xz
prompt-toolkit-upstream/3.0.36.zip
Adding upstream version 3.0.36.upstream/3.0.36upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'examples/prompts/history/slow-history.py')
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diff --git a/examples/prompts/history/slow-history.py b/examples/prompts/history/slow-history.py
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+#!/usr/bin/env python
+"""
+Simple example of a custom, very slow history, that is loaded asynchronously.
+
+By wrapping it in `ThreadedHistory`, the history will load in the background
+without blocking any user interaction.
+"""
+import time
+
+from prompt_toolkit import PromptSession
+from prompt_toolkit.history import History, ThreadedHistory
+
+
+class SlowHistory(History):
+ """
+ Example class that loads the history very slowly...
+ """
+
+ def load_history_strings(self):
+ for i in range(1000):
+ time.sleep(1) # Emulate slowness.
+ yield f"item-{i}"
+
+ def store_string(self, string):
+ pass # Don't store strings.
+
+
+def main():
+ print(
+ "Asynchronous loading of history. Notice that the up-arrow will work "
+ "for as far as the completions are loaded.\n"
+ "Even when the input is accepted, loading will continue in the "
+ "background and when the next prompt is displayed.\n"
+ )
+ our_history = ThreadedHistory(SlowHistory())
+
+ # The history needs to be passed to the `PromptSession`. It can't be passed
+ # to the `prompt` call because only one history can be used during a
+ # session.
+ session = PromptSession(history=our_history)
+
+ while True:
+ text = session.prompt("Say something: ")
+ print("You said: %s" % text)
+
+
+if __name__ == "__main__":
+ main()