Adding fuzzy history search to IPython

[NightMachinery]

I have cobbled up the following:

# Install https://github.com/nk412/pyfzf first
from IPython.core.history import HistoryAccessor
hista = HistoryAccessor()
from pyfzf.pyfzf import FzfPrompt
fzf = FzfPrompt()
def gethistf():
    return fzf.prompt([line for n1, n2, line in hista.get_tail(2000)], "--bind 'tab:toggle,shift-tab:toggle+beginning-of-line+kill-line,?:toggle-preview,ctrl-j:toggle+beginning-of-line+kill-line,ctrl-t:top' --multi")

Example usage:

In [1]: gethistf()
Out[1]: ["r = g.search('(from:dan@tldrnewsletter.com AND NOT label:auto/processed)', maxResults=20)"]

Now I have these problems:

• How do I set the current line's command to list(gethistf())?
• How do register a keyboard hotkey to call my function? (A widget thing, e.g., CTRL+r will call myfunction with the current line's contents.)
• What's the best way of sourcing these code changes for all future IPython sessions?

[Carreau]

Thanks for your question and the work you did, apologies my response is going to be a bit terse, but I'll try to come back to it later if you haven't figured it out

The CLI use Python Prompt toolkit for most shortcut and UI, so some documentation can be found there.

IPython/terminal/shortcuts.py is the file that handle shortcuts. Here is some docs about shortcuts (though it might be a bit old). https://ipython.readthedocs.io/en/stable/config/details.html#keyboard-shortcuts

You will see in IPython/terminal/interactiveshell.py ~line 314:

self.pt_app = PromptSession(
                            editing_mode=editing_mode,
                            key_bindings=key_bindings,
                            history=history,
                            completer=IPythonPTCompleter(shell=self),
                            enable_history_search = self.enable_history_search,
                            style=self.style,
                            include_default_pygments_style=False,
                            mouse_support=self.mouse_support,
                            enable_open_in_editor=self.extra_open_editor_shortcuts,
                            color_depth=self.color_depth,
                            tempfile_suffix=".py",
                            **self._extra_prompt_options())

That we pass the history to prompt toolkit, so I'm quasi-sure that history searching is handled by prompt toolkit, you might find more informations there.

As you will see prompt toolkit is not readline so might not work with the .prompt() method you use, but prompt toolkit should be able display a similar UI, it would be great.

[GHPS]

@ NightMachinary The idea is good - so good that someone had
it before:

https://github.com/tbxy09/ipython_plugin

Have you tried this plugin?

[NightMachinery]

@GHPS I will take a look at it.

[infokiller]

I implemented fzf history integration a while ago: https://github.com/infokiller/config-public/blob/master/.config/ipython/profile_default/startup/ext/fzf_history.py

It supports preview with syntax highlighting via Pygments, selecting multiple commands, multi-line commands, and maybe other stuff.
I plan to release it as an IPython extension.

[iloveitaly]

This post has a great script for this, including multi-line fzf search. Here's the full script in my dotfiles.