Ich hatte die Python-Shell implementiert code.InteractiveConsole, um die Befehle für ein Projekt auszuführen. Unten ist eine vereinfachte Version, obwohl sie noch ziemlich lang ist, da ich Bindungen für spezielle Schlüssel (wie Return, Tab ...) geschrieben habe, die sich wie in der Python-Konsole verhalten sollen. Es ist möglich, weitere Funktionen wie die automatische Vervollständigung mit jedi und die Syntax-Hervorhebung mit pylements hinzuzufügen.
Die Hauptidee ist, dass ich die push()Methode von verwende code.InteractiveConsole, um die Befehle auszuführen. Diese Methode wird zurückgegeben, Truewenn es sich beispielsweise um einen Teilbefehl handelt def test(x):, und ich verwende dieses Feedback, um eine ...Eingabeaufforderung einzufügen . Andernfalls wird die Ausgabe angezeigt und eine neue >>>Eingabeaufforderung angezeigt. Ich erfasse die Ausgabe mit contextlib.redirect_stdout.
Es gibt auch viel Code, der Markierungen und das Vergleichen von Indizes beinhaltet, da ich den Benutzer daran hindere, Text in zuvor ausgeführte Befehle einzufügen. Die Idee ist, dass ich eine Markierung 'Eingabe' erstellt habe, die mir sagt, wo der Beginn der aktiven Eingabeaufforderung liegt und mit der self.compare('insert', '<', 'input')ich wissen kann, wann der Benutzer versucht, Text über der aktiven Eingabeaufforderung einzufügen.
import tkinter as tk
import sys
import re
from code import InteractiveConsole
from contextlib import redirect_stderr, redirect_stdout
from io import StringIO
class History(list):
def __getitem__(self, index):
try:
return list.__getitem__(self, index)
except IndexError:
return
class TextConsole(tk.Text):
def __init__(self, master, **kw):
kw.setdefault('width', 50)
kw.setdefault('wrap', 'word')
kw.setdefault('prompt1', '>>> ')
kw.setdefault('prompt2', '... ')
banner = kw.pop('banner', 'Python %s\n' % sys.version)
self._prompt1 = kw.pop('prompt1')
self._prompt2 = kw.pop('prompt2')
tk.Text.__init__(self, master, **kw)
# --- history
self.history = History()
self._hist_item = 0
self._hist_match = ''
# --- initialization
self._console = InteractiveConsole() # python console to execute commands
self.insert('end', banner, 'banner')
self.prompt()
self.mark_set('input', 'insert')
self.mark_gravity('input', 'left')
# --- bindings
self.bind('<Control-Return>', self.on_ctrl_return)
self.bind('<Shift-Return>', self.on_shift_return)
self.bind('<KeyPress>', self.on_key_press)
self.bind('<KeyRelease>', self.on_key_release)
self.bind('<Tab>', self.on_tab)
self.bind('<Down>', self.on_down)
self.bind('<Up>', self.on_up)
self.bind('<Return>', self.on_return)
self.bind('<BackSpace>', self.on_backspace)
self.bind('<Control-c>', self.on_ctrl_c)
self.bind('<<Paste>>', self.on_paste)
def on_ctrl_c(self, event):
"""Copy selected code, removing prompts first"""
sel = self.tag_ranges('sel')
if sel:
txt = self.get('sel.first', 'sel.last').splitlines()
lines = []
for i, line in enumerate(txt):
if line.startswith(self._prompt1):
lines.append(line[len(self._prompt1):])
elif line.startswith(self._prompt2):
lines.append(line[len(self._prompt2):])
else:
lines.append(line)
self.clipboard_clear()
self.clipboard_append('\n'.join(lines))
return 'break'
def on_paste(self, event):
"""Paste commands"""
if self.compare('insert', '<', 'input'):
return "break"
sel = self.tag_ranges('sel')
if sel:
self.delete('sel.first', 'sel.last')
txt = self.clipboard_get()
self.insert("insert", txt)
self.insert_cmd(self.get("input", "end"))
return 'break'
def prompt(self, result=False):
"""Insert a prompt"""
if result:
self.insert('end', self._prompt2, 'prompt')
else:
self.insert('end', self._prompt1, 'prompt')
self.mark_set('input', 'end-1c')
def on_key_press(self, event):
"""Prevent text insertion in command history"""
if self.compare('insert', '<', 'input') and event.keysym not in ['Left', 'Right']:
self._hist_item = len(self.history)
self.mark_set('insert', 'input lineend')
if not event.char.isalnum():
return 'break'
def on_key_release(self, event):
"""Reset history scrolling"""
if self.compare('insert', '<', 'input') and event.keysym not in ['Left', 'Right']:
self._hist_item = len(self.history)
return 'break'
def on_up(self, event):
"""Handle up arrow key press"""
if self.compare('insert', '<', 'input'):
self.mark_set('insert', 'end')
return 'break'
elif self.index('input linestart') == self.index('insert linestart'):
# navigate history
line = self.get('input', 'insert')
self._hist_match = line
hist_item = self._hist_item
self._hist_item -= 1
item = self.history[self._hist_item]
while self._hist_item >= 0 and not item.startswith(line):
self._hist_item -= 1
item = self.history[self._hist_item]
if self._hist_item >= 0:
index = self.index('insert')
self.insert_cmd(item)
self.mark_set('insert', index)
else:
self._hist_item = hist_item
return 'break'
def on_down(self, event):
"""Handle down arrow key press"""
if self.compare('insert', '<', 'input'):
self.mark_set('insert', 'end')
return 'break'
elif self.compare('insert lineend', '==', 'end-1c'):
# navigate history
line = self._hist_match
self._hist_item += 1
item = self.history[self._hist_item]
while item is not None and not item.startswith(line):
self._hist_item += 1
item = self.history[self._hist_item]
if item is not None:
self.insert_cmd(item)
self.mark_set('insert', 'input+%ic' % len(self._hist_match))
else:
self._hist_item = len(self.history)
self.delete('input', 'end')
self.insert('insert', line)
return 'break'
def on_tab(self, event):
"""Handle tab key press"""
if self.compare('insert', '<', 'input'):
self.mark_set('insert', 'input lineend')
return "break"
# indent code
sel = self.tag_ranges('sel')
if sel:
start = str(self.index('sel.first'))
end = str(self.index('sel.last'))
start_line = int(start.split('.')[0])
end_line = int(end.split('.')[0]) + 1
for line in range(start_line, end_line):
self.insert('%i.0' % line, ' ')
else:
txt = self.get('insert-1c')
if not txt.isalnum() and txt != '.':
self.insert('insert', ' ')
return "break"
def on_shift_return(self, event):
"""Handle Shift+Return key press"""
if self.compare('insert', '<', 'input'):
self.mark_set('insert', 'input lineend')
return 'break'
else: # execute commands
self.mark_set('insert', 'end')
self.insert('insert', '\n')
self.insert('insert', self._prompt2, 'prompt')
self.eval_current(True)
def on_return(self, event=None):
"""Handle Return key press"""
if self.compare('insert', '<', 'input'):
self.mark_set('insert', 'input lineend')
return 'break'
else:
self.eval_current(True)
self.see('end')
return 'break'
def on_ctrl_return(self, event=None):
"""Handle Ctrl+Return key press"""
self.insert('insert', '\n' + self._prompt2, 'prompt')
return 'break'
def on_backspace(self, event):
"""Handle delete key press"""
if self.compare('insert', '<=', 'input'):
self.mark_set('insert', 'input lineend')
return 'break'
sel = self.tag_ranges('sel')
if sel:
self.delete('sel.first', 'sel.last')
else:
linestart = self.get('insert linestart', 'insert')
if re.search(r' $', linestart):
self.delete('insert-4c', 'insert')
else:
self.delete('insert-1c')
return 'break'
def insert_cmd(self, cmd):
"""Insert lines of code, adding prompts"""
input_index = self.index('input')
self.delete('input', 'end')
lines = cmd.splitlines()
if lines:
indent = len(re.search(r'^( )*', lines[0]).group())
self.insert('insert', lines[0][indent:])
for line in lines[1:]:
line = line[indent:]
self.insert('insert', '\n')
self.prompt(True)
self.insert('insert', line)
self.mark_set('input', input_index)
self.see('end')
def eval_current(self, auto_indent=False):
"""Evaluate code"""
index = self.index('input')
lines = self.get('input', 'insert lineend').splitlines() # commands to execute
self.mark_set('insert', 'insert lineend')
if lines: # there is code to execute
# remove prompts
lines = [lines[0].rstrip()] + [line[len(self._prompt2):].rstrip() for line in lines[1:]]
for i, l in enumerate(lines):
if l.endswith('?'):
lines[i] = 'help(%s)' % l[:-1]
cmds = '\n'.join(lines)
self.insert('insert', '\n')
out = StringIO() # command output
err = StringIO() # command error traceback
with redirect_stderr(err): # redirect error traceback to err
with redirect_stdout(out): # redirect command output
# execute commands in interactive console
res = self._console.push(cmds)
# if res is True, this is a partial command, e.g. 'def test():' and we need to wait for the rest of the code
errors = err.getvalue()
if errors: # there were errors during the execution
self.insert('end', errors) # display the traceback
self.mark_set('input', 'end')
self.see('end')
self.prompt() # insert new prompt
else:
output = out.getvalue() # get output
if output:
self.insert('end', output, 'output')
self.mark_set('input', 'end')
self.see('end')
if not res and self.compare('insert linestart', '>', 'insert'):
self.insert('insert', '\n')
self.prompt(res)
if auto_indent and lines:
# insert indentation similar to previous lines
indent = re.search(r'^( )*', lines[-1]).group()
line = lines[-1].strip()
if line and line[-1] == ':':
indent = indent + ' '
self.insert('insert', indent)
self.see('end')
if res:
self.mark_set('input', index)
self._console.resetbuffer() # clear buffer since the whole command will be retrieved from the text widget
elif lines:
self.history.append(lines) # add commands to history
self._hist_item = len(self.history)
out.close()
err.close()
else:
self.insert('insert', '\n')
self.prompt()
if __name__ == '__main__':
root = tk.Tk()
console = TextConsole(root)
console.pack(fill='both', expand=True)
root.mainloop()