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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 17:35:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 17:35:20 +0000 |
commit | e106bf94eff07d9a59771d9ccc4406421e18ab64 (patch) | |
tree | edb6545500e39df9c67aa918a6125bffc8ec1aee /examples/prompts/history/slow-history.py | |
parent | Initial commit. (diff) | |
download | prompt-toolkit-upstream.tar.xz prompt-toolkit-upstream.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')
-rwxr-xr-x | examples/prompts/history/slow-history.py | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/examples/prompts/history/slow-history.py b/examples/prompts/history/slow-history.py new file mode 100755 index 0000000..5b6a7a2 --- /dev/null +++ b/examples/prompts/history/slow-history.py @@ -0,0 +1,48 @@ +#!/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() |