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# encoding: utf-8
"""
An application for managing IPython history.
To be invoked as the `ipython history` subcommand.
"""
from __future__ import print_function
import os
import sqlite3
from IPython.config.application import Application
from IPython.core.application import BaseIPythonApplication
from IPython.utils.traitlets import Bool, Int, Dict
trim_hist_help = """Trim the IPython history database to the last 1000 entries.
This actually copies the last 1000 entries to a new database, and then replaces
the old file with the new.
"""
class HistoryTrim(BaseIPythonApplication):
description = trim_hist_help
backup = Bool(False, config=True,
help="Keep the old history file as history.sqlite.<N>")
keep = Int(1000, config=True,
help="Number of recent lines to keep in the database.")
flags = Dict(dict(
backup = ({'HistoryTrim' : {'backup' : True}},
"Set Application.log_level to 0, maximizing log output."
)
))
def start(self):
profile_dir = self.profile_dir.location
hist_file = os.path.join(profile_dir, 'history.sqlite')
con = sqlite3.connect(hist_file)
# Grab the recent history from the current database.
inputs = list(con.execute('SELECT session, line, source, source_raw FROM '
'history ORDER BY session DESC, line DESC LIMIT ?', (self.keep+1,)))
if len(inputs) <= self.keep:
print("There are already at most %d entries in the history database." % self.keep)
print("Not doing anything.")
return
print("Trimming history to the most recent %d entries." % self.keep)
inputs.pop() # Remove the extra element we got to check the length.
inputs.reverse()
first_session = inputs[0][0]
outputs = list(con.execute('SELECT session, line, output FROM '
'output_history WHERE session >= ?', (first_session,)))
sessions = list(con.execute('SELECT session, start, end, num_cmds, remark FROM '
'sessions WHERE session >= ?', (first_session,)))
con.close()
# Create the new history database.
new_hist_file = os.path.join(profile_dir, 'history.sqlite.new')
i = 0
while os.path.exists(new_hist_file):
# Make sure we don't interfere with an existing file.
i += 1
new_hist_file = os.path.join(profile_dir, 'history.sqlite.new'+str(i))
new_db = sqlite3.connect(new_hist_file)
new_db.execute("""CREATE TABLE IF NOT EXISTS sessions (session integer
primary key autoincrement, start timestamp,
end timestamp, num_cmds integer, remark text)""")
new_db.execute("""CREATE TABLE IF NOT EXISTS history
(session integer, line integer, source text, source_raw text,
PRIMARY KEY (session, line))""")
new_db.execute("""CREATE TABLE IF NOT EXISTS output_history
(session integer, line integer, output text,
PRIMARY KEY (session, line))""")
new_db.commit()
with new_db:
# Add the recent history into the new database.
new_db.executemany('insert into sessions values (?,?,?,?,?)', sessions)
new_db.executemany('insert into history values (?,?,?,?)', inputs)
new_db.executemany('insert into output_history values (?,?,?)', outputs)
new_db.close()
if self.backup:
i = 1
backup_hist_file = os.path.join(profile_dir, 'history.sqlite.old.%d' % i)
while os.path.exists(backup_hist_file):
i += 1
backup_hist_file = os.path.join(profile_dir, 'history.sqlite.old.%d' % i)
os.rename(hist_file, backup_hist_file)
print("Backed up longer history file to", backup_hist_file)
else:
os.remove(hist_file)
os.rename(new_hist_file, hist_file)
class HistoryApp(Application):
name = u'ipython-history'
description = "Manage the IPython history database."
subcommands = Dict(dict(
trim = (HistoryTrim, HistoryTrim.description.splitlines()[0]),
))
def start(self):
if self.subapp is None:
print("No subcommand specified. Must specify one of: %s" % \
(self.subcommands.keys()))
print()
self.print_description()
self.print_subcommands()
self.exit(1)
else:
return self.subapp.start()
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