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"Implement Idle Shell history mechanism with History class"
from idlelib.configHandler import idleConf
class History:
''' Implement Idle Shell history mechanism.
store - Store source statement (called from PyShell.resetoutput).
fetch - Fetch stored statement matching prefix already entered.
history_next - Bound to <<history-next>> event (default Alt-N).
history_prev - Bound to <<history-prev>> event (default Alt-P).
'''
def __init__(self, text, output_sep = "\n"):
'''Initialize data attributes and bind event methods.
.text - Idle wrapper of tk Text widget, with .bell().
.history - source statements, possibly with multiple lines.
.prefix - source already entered at prompt; filters history list.
.pointer - index into history.
.cyclic - wrap around history list (or not).
'''
self.text = text
self.history = []
self.prefix = None
self.pointer = None
self.output_sep = output_sep
self.cyclic = idleConf.GetOption("main", "History", "cyclic", 1, "bool")
text.bind("<<history-previous>>", self.history_prev)
text.bind("<<history-next>>", self.history_next)
def history_next(self, event):
"Fetch later statement; start with ealiest if cyclic."
self.fetch(reverse=False)
return "break"
def history_prev(self, event):
"Fetch earlier statement; start with most recent."
self.fetch(reverse=True)
return "break"
def _get_source(self, start, end):
# Get source code from start index to end index. Lines in the
# text control may be separated by sys.ps2 .
lines = self.text.get(start, end).split(self.output_sep)
return "\n".join(lines)
def _put_source(self, where, source):
output = self.output_sep.join(source.split("\n"))
self.text.insert(where, output)
def fetch(self, reverse):
"Fetch statememt and enter into text at cursor."
nhist = len(self.history)
pointer = self.pointer
prefix = self.prefix
if pointer is not None and prefix is not None:
if self.text.compare("insert", "!=", "end-1c") or \
self._get_source("iomark", "end-1c") != self.history[pointer]:
pointer = prefix = None
if pointer is None or prefix is None:
prefix = self._get_source("iomark", "end-1c")
if reverse:
pointer = nhist # will be decremented
else:
if self.cyclic:
pointer = -1 # will be incremented
else:
self.text.bell()
return
nprefix = len(prefix)
while 1:
if reverse:
pointer = pointer - 1
else:
pointer = pointer + 1
if pointer < 0 or pointer >= nhist:
self.text.bell()
if not self.cyclic and pointer < 0:
return
else:
if self._get_source("iomark", "end-1c") != prefix:
self.text.delete("iomark", "end-1c")
self._put_source("iomark", prefix)
pointer = prefix = None
break
item = self.history[pointer]
if item[:nprefix] == prefix and len(item) > nprefix:
self.text.delete("iomark", "end-1c")
self._put_source("iomark", item)
break
self.text.mark_set("insert", "end-1c")
self.text.see("insert")
self.text.tag_remove("sel", "1.0", "end")
self.pointer = pointer
self.prefix = prefix
def store(self, source):
"Store Shell input statement into history list."
source = source.strip()
if len(source) > 2:
# avoid duplicates
try:
self.history.remove(source)
except ValueError:
pass
self.history.append(source)
self.pointer = None
self.prefix = None
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