106 lines
4 KiB
Python
106 lines
4 KiB
Python
"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):
|
|
'''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.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 fetch(self, reverse):
|
|
'''Fetch statememt and replace current line in text widget.
|
|
|
|
Set prefix and pointer as needed for successive fetches.
|
|
Reset them to None, None when returning to the start line.
|
|
Sound bell when return to start line or cannot leave a line
|
|
because cyclic is False.
|
|
'''
|
|
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.text.get("iomark", "end-1c") != self.history[pointer]:
|
|
pointer = prefix = None
|
|
self.text.mark_set("insert", "end-1c") # != after cursor move
|
|
if pointer is None or prefix is None:
|
|
prefix = self.text.get("iomark", "end-1c")
|
|
if reverse:
|
|
pointer = nhist # will be decremented
|
|
else:
|
|
if self.cyclic:
|
|
pointer = -1 # will be incremented
|
|
else: # abort history_next
|
|
self.text.bell()
|
|
return
|
|
nprefix = len(prefix)
|
|
while 1:
|
|
pointer += -1 if reverse else 1
|
|
if pointer < 0 or pointer >= nhist:
|
|
self.text.bell()
|
|
if not self.cyclic and pointer < 0: # abort history_prev
|
|
return
|
|
else:
|
|
if self.text.get("iomark", "end-1c") != prefix:
|
|
self.text.delete("iomark", "end-1c")
|
|
self.text.insert("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.text.insert("iomark", item)
|
|
break
|
|
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
|
|
|
|
if __name__ == "__main__":
|
|
from test import test_support as support
|
|
support.use_resources = ['gui']
|
|
from unittest import main
|
|
main('idlelib.idle_test.test_idlehistory', verbosity=2, exit=False)
|