migrate_history.py

"""
Migrate old IPython history (readline) to new IPython history (sqlite)

Author: Min RK (benjaminrk@gmail.com)
License: Public Domain
"""
import os

from IPython.core.interactiveshell import InteractiveShell
from IPython.core.history import HistoryManager
from IPython.utils.path import locate_profile, get_ipython_dir

def migrate_history(old_histfile, new_histfile):
    """populate an IPython sqlite history from an old readline history file"""
    # shell = InteractiveShell.instance()
    history = HistoryManager(hist_file=new_histfile,
        # this line shouldn't be necessary, but it is in 0.13
        shell = InteractiveShell.instance()
    )
    
    with open(old_histfile) as f:
        # iterate through readline history,
        # and write to the new history database
        for linenum, line in enumerate(f):
            history.store_inputs(linenum, line)

if __name__ == '__main__':
    # the default location of old history file
    old = os.path.join(get_ipython_dir(), "history")
    # the default location of the new history file
    new = os.path.join(locate_profile(), "history.sqlite")
    migrate_history(old, new)