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Add flushing to stdout/stderr in system calls.
Add flushing to stdout/stderr in system calls.

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history.py
277 lines | 8.6 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
""" History related magics and functionality """
# Stdlib imports
import fnmatch
import os
from IPython.utils.io import Term, ask_yes_no
from IPython.utils.warn import warn
from IPython.core import ipapi
def magic_history(self, parameter_s = ''):
"""Print input history (_i<n> variables), with most recent last.
%history -> print at most 40 inputs (some may be multi-line)\\
%history n -> print at most n inputs\\
%history n1 n2 -> print inputs between n1 and n2 (n2 not included)\\
By default, input history is printed without line numbers so it can be
directly pasted into an editor.
With -n, each input's number <n> is shown, and is accessible as the
automatically generated variable _i<n> as well as In[<n>]. Multi-line
statements are printed starting at a new line for easy copy/paste.
Options:
-n: print line numbers for each input.
This feature is only available if numbered prompts are in use.
-o: also print outputs for each input.
-p: print classic '>>>' python prompts before each input. This is useful
for making documentation, and in conjunction with -o, for producing
doctest-ready output.
-t: (default) print the 'translated' history, as IPython understands it.
IPython filters your input and converts it all into valid Python source
before executing it (things like magics or aliases are turned into
function calls, for example). With this option, you'll see the native
history instead of the user-entered version: '%cd /' will be seen as
'_ip.magic("%cd /")' instead of '%cd /'.
-r: print the 'raw' history, i.e. the actual commands you typed.
-g: treat the arg as a pattern to grep for in (full) history.
This includes the "shadow history" (almost all commands ever written).
Use '%hist -g' to show full shadow history (may be very long).
In shadow history, every index nuwber starts with 0.
-f FILENAME: instead of printing the output to the screen, redirect it to
the given file. The file is always overwritten, though IPython asks for
confirmation first if it already exists.
"""
if not self.outputcache.do_full_cache:
print 'This feature is only available if numbered prompts are in use.'
return
opts,args = self.parse_options(parameter_s,'gnoptsrf:',mode='list')
# Check if output to specific file was requested.
try:
outfname = opts['f']
except KeyError:
outfile = Term.cout # default
# We don't want to close stdout at the end!
close_at_end = False
else:
if os.path.exists(outfname):
if not ask_yes_no("File %r exists. Overwrite?" % outfname):
print 'Aborting.'
return
outfile = open(outfname,'w')
close_at_end = True
if 't' in opts:
input_hist = self.input_hist
elif 'r' in opts:
input_hist = self.input_hist_raw
else:
input_hist = self.input_hist
default_length = 40
pattern = None
if 'g' in opts:
init = 1
final = len(input_hist)
parts = parameter_s.split(None, 1)
if len(parts) == 1:
parts += '*'
head, pattern = parts
pattern = "*" + pattern + "*"
elif len(args) == 0:
final = len(input_hist)-1
init = max(1,final-default_length)
elif len(args) == 1:
final = len(input_hist)
init = max(1, final-int(args[0]))
elif len(args) == 2:
init, final = map(int, args)
else:
warn('%hist takes 0, 1 or 2 arguments separated by spaces.')
print >> Term.cout, self.magic_hist.__doc__
return
width = len(str(final))
line_sep = ['','\n']
print_nums = 'n' in opts
print_outputs = 'o' in opts
pyprompts = 'p' in opts
found = False
if pattern is not None:
sh = self.shadowhist.all()
for idx, s in sh:
if fnmatch.fnmatch(s, pattern):
print >> outfile, "0%d: %s" %(idx, s)
found = True
if found:
print >> outfile, "==="
print >> outfile, \
"shadow history ends, fetch by %rep <number> (must start with 0)"
print >> outfile, "=== start of normal history ==="
for in_num in range(init,final):
inline = input_hist[in_num]
if pattern is not None and not fnmatch.fnmatch(inline, pattern):
continue
multiline = int(inline.count('\n') > 1)
if print_nums:
print >> outfile, \
'%s:%s' % (str(in_num).ljust(width), line_sep[multiline]),
if pyprompts:
print >> outfile, '>>>',
if multiline:
lines = inline.splitlines()
print >> outfile, '\n... '.join(lines)
print >> outfile, '... '
else:
print >> outfile, inline,
else:
print >> outfile, inline,
if print_outputs:
output = self.shell.user_ns['Out'].get(in_num)
if output is not None:
print >> outfile, repr(output)
if close_at_end:
outfile.close()
def magic_hist(self, parameter_s=''):
"""Alternate name for %history."""
return self.magic_history(parameter_s)
def rep_f(self, arg):
r""" Repeat a command, or get command to input line for editing
- %rep (no arguments):
Place a string version of last computation result (stored in the special '_'
variable) to the next input prompt. Allows you to create elaborate command
lines without using copy-paste::
$ l = ["hei", "vaan"]
$ "".join(l)
==> heivaan
$ %rep
$ heivaan_ <== cursor blinking
%rep 45
Place history line 45 to next input prompt. Use %hist to find out the
number.
%rep 1-4 6-7 3
Repeat the specified lines immediately. Input slice syntax is the same as
in %macro and %save.
%rep foo
Place the most recent line that has the substring "foo" to next input.
(e.g. 'svn ci -m foobar').
"""
opts,args = self.parse_options(arg,'',mode='list')
if not args:
self.set_next_input(str(self.user_ns["_"]))
return
if len(args) == 1 and not '-' in args[0]:
arg = args[0]
if len(arg) > 1 and arg.startswith('0'):
# get from shadow hist
num = int(arg[1:])
line = self.shadowhist.get(num)
self.set_next_input(str(line))
return
try:
num = int(args[0])
self.set_next_input(str(self.input_hist_raw[num]).rstrip())
return
except ValueError:
pass
for h in reversed(self.input_hist_raw):
if 'rep' in h:
continue
if fnmatch.fnmatch(h,'*' + arg + '*'):
self.set_next_input(str(h).rstrip())
return
try:
lines = self.extract_input_slices(args, True)
print "lines",lines
self.runlines(lines)
except ValueError:
print "Not found in recent history:", args
_sentinel = object()
class ShadowHist(object):
def __init__(self,db):
# cmd => idx mapping
self.curidx = 0
self.db = db
self.disabled = False
def inc_idx(self):
idx = self.db.get('shadowhist_idx', 1)
self.db['shadowhist_idx'] = idx + 1
return idx
def add(self, ent):
if self.disabled:
return
try:
old = self.db.hget('shadowhist', ent, _sentinel)
if old is not _sentinel:
return
newidx = self.inc_idx()
#print "new",newidx # dbg
self.db.hset('shadowhist',ent, newidx)
except:
ipapi.get().showtraceback()
print "WARNING: disabling shadow history"
self.disabled = True
def all(self):
d = self.db.hdict('shadowhist')
items = [(i,s) for (s,i) in d.items()]
items.sort()
return items
def get(self, idx):
all = self.all()
for k, v in all:
#print k,v
if k == idx:
return v
def init_ipython(ip):
ip.define_magic("rep",rep_f)
ip.define_magic("hist",magic_hist)
ip.define_magic("history",magic_history)
# XXX - ipy_completers are in quarantine, need to be updated to new apis
#import ipy_completers
#ipy_completers.quick_completer('%hist' ,'-g -t -r -n')