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