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@@ -1,931 +1,972 b'' | |||
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1 | 1 | # Standard library imports |
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2 | 2 | import sys |
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3 | 3 | |
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4 | 4 | # System library imports |
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5 | 5 | from PyQt4 import QtCore, QtGui |
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6 | 6 | |
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7 | 7 | # Local imports |
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8 | from IPython.external.columnize import columnize | |
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9 | 8 | from ansi_code_processor import QtAnsiCodeProcessor |
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10 | 9 | from completion_widget import CompletionWidget |
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11 | 10 | |
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12 | 11 | |
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13 | 12 | class ConsoleWidget(QtGui.QPlainTextEdit): |
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14 | 13 | """ Base class for console-type widgets. This class is mainly concerned with |
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15 | 14 | dealing with the prompt, keeping the cursor inside the editing line, and |
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16 | 15 | handling ANSI escape sequences. |
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17 | 16 | """ |
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18 | 17 | |
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19 | 18 | # Whether to process ANSI escape codes. |
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20 | 19 | ansi_codes = True |
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21 | 20 | |
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22 | 21 | # The maximum number of lines of text before truncation. |
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23 | 22 | buffer_size = 500 |
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24 | 23 | |
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25 | 24 | # Whether to use a CompletionWidget or plain text output for tab completion. |
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26 | 25 | gui_completion = True |
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27 | 26 | |
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28 | 27 | # Whether to override ShortcutEvents for the keybindings defined by this |
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29 | 28 | # widget (Ctrl+n, Ctrl+a, etc). Enable this if you want this widget to take |
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30 | 29 | # priority (when it has focus) over, e.g., window-level menu shortcuts. |
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31 | 30 | override_shortcuts = False |
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32 | 31 | |
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33 | 32 | # Protected class variables. |
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34 | 33 | _ctrl_down_remap = { QtCore.Qt.Key_B : QtCore.Qt.Key_Left, |
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35 | 34 | QtCore.Qt.Key_F : QtCore.Qt.Key_Right, |
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36 | 35 | QtCore.Qt.Key_A : QtCore.Qt.Key_Home, |
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37 | 36 | QtCore.Qt.Key_E : QtCore.Qt.Key_End, |
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38 | 37 | QtCore.Qt.Key_P : QtCore.Qt.Key_Up, |
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39 | 38 | QtCore.Qt.Key_N : QtCore.Qt.Key_Down, |
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40 | 39 | QtCore.Qt.Key_D : QtCore.Qt.Key_Delete, } |
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41 | 40 | _shortcuts = set(_ctrl_down_remap.keys() + |
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42 | 41 | [ QtCore.Qt.Key_C, QtCore.Qt.Key_V ]) |
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43 | 42 | |
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44 | 43 | #--------------------------------------------------------------------------- |
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45 | 44 | # 'QObject' interface |
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46 | 45 | #--------------------------------------------------------------------------- |
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47 | 46 | |
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48 | 47 | def __init__(self, parent=None): |
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49 | 48 | QtGui.QPlainTextEdit.__init__(self, parent) |
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50 | 49 | |
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51 | 50 | # Initialize protected variables. Some variables contain useful state |
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52 | 51 | # information for subclasses; they should be considered read-only. |
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53 | 52 | self._ansi_processor = QtAnsiCodeProcessor() |
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54 | 53 | self._completion_widget = CompletionWidget(self) |
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55 | 54 | self._continuation_prompt = '> ' |
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56 | 55 | self._continuation_prompt_html = None |
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57 | 56 | self._executing = False |
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58 | 57 | self._prompt = '' |
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59 | 58 | self._prompt_html = None |
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60 | 59 | self._prompt_pos = 0 |
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61 | 60 | self._reading = False |
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62 | 61 | self._reading_callback = None |
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63 | 62 | self._tab_width = 8 |
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64 | 63 | |
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65 | 64 | # Set a monospaced font. |
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66 | 65 | self.reset_font() |
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67 | 66 | |
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68 | 67 | # Define a custom context menu. |
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69 | 68 | self._context_menu = QtGui.QMenu(self) |
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70 | 69 | |
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71 | 70 | copy_action = QtGui.QAction('Copy', self) |
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72 | 71 | copy_action.triggered.connect(self.copy) |
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73 | 72 | self.copyAvailable.connect(copy_action.setEnabled) |
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74 | 73 | self._context_menu.addAction(copy_action) |
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75 | 74 | |
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76 | 75 | self._paste_action = QtGui.QAction('Paste', self) |
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77 | 76 | self._paste_action.triggered.connect(self.paste) |
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78 | 77 | self._context_menu.addAction(self._paste_action) |
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79 | 78 | self._context_menu.addSeparator() |
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80 | 79 | |
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81 | 80 | select_all_action = QtGui.QAction('Select All', self) |
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82 | 81 | select_all_action.triggered.connect(self.selectAll) |
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83 | 82 | self._context_menu.addAction(select_all_action) |
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84 | 83 | |
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85 | 84 | def event(self, event): |
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86 | 85 | """ Reimplemented to override shortcuts, if necessary. |
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87 | 86 | """ |
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88 | 87 | # On Mac OS, it is always unnecessary to override shortcuts, hence the |
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89 | 88 | # check below. Users should just use the Control key instead of the |
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90 | 89 | # Command key. |
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91 | 90 | if self.override_shortcuts and \ |
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92 | 91 | sys.platform != 'darwin' and \ |
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93 | 92 | event.type() == QtCore.QEvent.ShortcutOverride and \ |
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94 | 93 | self._control_down(event.modifiers()) and \ |
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95 | 94 | event.key() in self._shortcuts: |
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96 | 95 | event.accept() |
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97 | 96 | return True |
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98 | 97 | else: |
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99 | 98 | return QtGui.QPlainTextEdit.event(self, event) |
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100 | 99 | |
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101 | 100 | #--------------------------------------------------------------------------- |
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102 | 101 | # 'QWidget' interface |
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103 | 102 | #--------------------------------------------------------------------------- |
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104 | 103 | |
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105 | 104 | def contextMenuEvent(self, event): |
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106 | 105 | """ Reimplemented to create a menu without destructive actions like |
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107 | 106 | 'Cut' and 'Delete'. |
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108 | 107 | """ |
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109 | 108 | clipboard_empty = QtGui.QApplication.clipboard().text().isEmpty() |
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110 | 109 | self._paste_action.setEnabled(not clipboard_empty) |
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111 | 110 | |
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112 | 111 | self._context_menu.exec_(event.globalPos()) |
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113 | 112 | |
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114 | 113 | def dragMoveEvent(self, event): |
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115 | 114 | """ Reimplemented to disable moving text by drag and drop. |
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116 | 115 | """ |
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117 | 116 | event.ignore() |
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118 | 117 | |
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119 | 118 | def keyPressEvent(self, event): |
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120 | 119 | """ Reimplemented to create a console-like interface. |
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121 | 120 | """ |
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122 | 121 | intercepted = False |
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123 | 122 | cursor = self.textCursor() |
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124 | 123 | position = cursor.position() |
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125 | 124 | key = event.key() |
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126 | 125 | ctrl_down = self._control_down(event.modifiers()) |
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127 | 126 | alt_down = event.modifiers() & QtCore.Qt.AltModifier |
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128 | 127 | shift_down = event.modifiers() & QtCore.Qt.ShiftModifier |
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129 | 128 | |
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130 | 129 | # Even though we have reimplemented 'paste', the C++ level slot is still |
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131 | 130 | # called by Qt. So we intercept the key press here. |
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132 | 131 | if event.matches(QtGui.QKeySequence.Paste): |
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133 | 132 | self.paste() |
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134 | 133 | intercepted = True |
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135 | 134 | |
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136 | 135 | elif ctrl_down: |
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137 | 136 | if key in self._ctrl_down_remap: |
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138 | 137 | ctrl_down = False |
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139 | 138 | key = self._ctrl_down_remap[key] |
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140 | 139 | event = QtGui.QKeyEvent(QtCore.QEvent.KeyPress, key, |
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141 | 140 | QtCore.Qt.NoModifier) |
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142 | 141 | |
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143 | 142 | elif key == QtCore.Qt.Key_K: |
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144 | 143 | if self._in_buffer(position): |
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145 | 144 | cursor.movePosition(QtGui.QTextCursor.EndOfLine, |
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146 | 145 | QtGui.QTextCursor.KeepAnchor) |
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147 | 146 | cursor.removeSelectedText() |
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148 | 147 | intercepted = True |
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149 | 148 | |
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150 | 149 | elif key == QtCore.Qt.Key_X: |
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151 | 150 | intercepted = True |
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152 | 151 | |
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153 | 152 | elif key == QtCore.Qt.Key_Y: |
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154 | 153 | self.paste() |
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155 | 154 | intercepted = True |
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156 | 155 | |
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157 | 156 | elif alt_down: |
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158 | 157 | if key == QtCore.Qt.Key_B: |
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159 | 158 | self.setTextCursor(self._get_word_start_cursor(position)) |
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160 | 159 | intercepted = True |
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161 | 160 | |
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162 | 161 | elif key == QtCore.Qt.Key_F: |
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163 | 162 | self.setTextCursor(self._get_word_end_cursor(position)) |
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164 | 163 | intercepted = True |
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165 | 164 | |
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166 | 165 | elif key == QtCore.Qt.Key_Backspace: |
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167 | 166 | cursor = self._get_word_start_cursor(position) |
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168 | 167 | cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor) |
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169 | 168 | cursor.removeSelectedText() |
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170 | 169 | intercepted = True |
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171 | 170 | |
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172 | 171 | elif key == QtCore.Qt.Key_D: |
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173 | 172 | cursor = self._get_word_end_cursor(position) |
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174 | 173 | cursor.setPosition(position, QtGui.QTextCursor.KeepAnchor) |
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175 | 174 | cursor.removeSelectedText() |
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176 | 175 | intercepted = True |
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177 | 176 | |
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178 | 177 | if self._completion_widget.isVisible(): |
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179 | 178 | self._completion_widget.keyPressEvent(event) |
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180 | 179 | intercepted = event.isAccepted() |
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181 | 180 | |
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182 | 181 | else: |
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183 | 182 | if key in (QtCore.Qt.Key_Return, QtCore.Qt.Key_Enter): |
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184 | 183 | if self._reading: |
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185 | 184 | self.appendPlainText('\n') |
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186 | 185 | self._reading = False |
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187 | 186 | if self._reading_callback: |
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188 | 187 | self._reading_callback() |
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189 | 188 | elif not self._executing: |
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190 | 189 | self.execute(interactive=True) |
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191 | 190 | intercepted = True |
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192 | 191 | |
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193 | 192 | elif key == QtCore.Qt.Key_Up: |
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194 | 193 | if self._reading or not self._up_pressed(): |
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195 | 194 | intercepted = True |
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196 | 195 | else: |
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197 | 196 | prompt_line = self._get_prompt_cursor().blockNumber() |
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198 | 197 | intercepted = cursor.blockNumber() <= prompt_line |
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199 | 198 | |
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200 | 199 | elif key == QtCore.Qt.Key_Down: |
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201 | 200 | if self._reading or not self._down_pressed(): |
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202 | 201 | intercepted = True |
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203 | 202 | else: |
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204 | 203 | end_line = self._get_end_cursor().blockNumber() |
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205 | 204 | intercepted = cursor.blockNumber() == end_line |
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206 | 205 | |
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207 | 206 | elif key == QtCore.Qt.Key_Tab: |
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208 | 207 | if self._reading: |
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209 | 208 | intercepted = False |
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210 | 209 | else: |
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211 | 210 | intercepted = not self._tab_pressed() |
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212 | 211 | |
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213 | 212 | elif key == QtCore.Qt.Key_Left: |
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214 | 213 | intercepted = not self._in_buffer(position - 1) |
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215 | 214 | |
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216 | 215 | elif key == QtCore.Qt.Key_Home: |
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217 | 216 | cursor.movePosition(QtGui.QTextCursor.StartOfLine) |
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218 | 217 | start_pos = cursor.position() |
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219 | 218 | start_line = cursor.blockNumber() |
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220 | 219 | if start_line == self._get_prompt_cursor().blockNumber(): |
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221 | 220 | start_pos += len(self._prompt) |
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222 | 221 | else: |
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223 | 222 | start_pos += len(self._continuation_prompt) |
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224 | 223 | if shift_down and self._in_buffer(position): |
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225 | 224 | self._set_selection(position, start_pos) |
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226 | 225 | else: |
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227 | 226 | self._set_position(start_pos) |
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228 | 227 | intercepted = True |
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229 | 228 | |
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230 | 229 | elif key == QtCore.Qt.Key_Backspace and not alt_down: |
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231 | 230 | |
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232 | 231 | # Line deletion (remove continuation prompt) |
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233 | 232 | len_prompt = len(self._continuation_prompt) |
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234 | 233 | if not self._reading and \ |
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235 | 234 | cursor.columnNumber() == len_prompt and \ |
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236 | 235 | position != self._prompt_pos: |
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237 | 236 | cursor.setPosition(position - len_prompt, |
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238 | 237 | QtGui.QTextCursor.KeepAnchor) |
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239 | 238 | cursor.removeSelectedText() |
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240 | 239 | |
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241 | 240 | # Regular backwards deletion |
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242 | 241 | else: |
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243 | 242 | anchor = cursor.anchor() |
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244 | 243 | if anchor == position: |
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245 | 244 | intercepted = not self._in_buffer(position - 1) |
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246 | 245 | else: |
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247 | 246 | intercepted = not self._in_buffer(min(anchor, position)) |
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248 | 247 | |
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249 | 248 | elif key == QtCore.Qt.Key_Delete: |
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250 | 249 | anchor = cursor.anchor() |
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251 | 250 | intercepted = not self._in_buffer(min(anchor, position)) |
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252 | 251 | |
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253 | 252 | # Don't move cursor if control is down to allow copy-paste using |
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254 | 253 | # the keyboard in any part of the buffer. |
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255 | 254 | if not ctrl_down: |
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256 | 255 | self._keep_cursor_in_buffer() |
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257 | 256 | |
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258 | 257 | if not intercepted: |
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259 | 258 | QtGui.QPlainTextEdit.keyPressEvent(self, event) |
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260 | 259 | |
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261 | 260 | #-------------------------------------------------------------------------- |
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262 | 261 | # 'QPlainTextEdit' interface |
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263 | 262 | #-------------------------------------------------------------------------- |
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264 | 263 | |
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265 | 264 | def appendHtml(self, html): |
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266 | 265 | """ Reimplemented to not append HTML as a new paragraph, which doesn't |
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267 | 266 | make sense for a console widget. |
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268 | 267 | """ |
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269 | 268 | cursor = self._get_end_cursor() |
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270 | 269 | cursor.insertHtml(html) |
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271 | 270 | |
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272 | 271 | # After appending HTML, the text document "remembers" the current |
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273 | 272 | # formatting, which means that subsequent calls to 'appendPlainText' |
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274 | 273 | # will be formatted similarly, a behavior that we do not want. To |
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275 | 274 | # prevent this, we make sure that the last character has no formatting. |
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276 | 275 | cursor.movePosition(QtGui.QTextCursor.Left, |
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277 | 276 | QtGui.QTextCursor.KeepAnchor) |
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278 | 277 | if cursor.selection().toPlainText().trimmed().isEmpty(): |
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279 | 278 | # If the last character is whitespace, it doesn't matter how it's |
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280 | 279 | # formatted, so just clear the formatting. |
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281 | 280 | cursor.setCharFormat(QtGui.QTextCharFormat()) |
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282 | 281 | else: |
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283 | 282 | # Otherwise, add an unformatted space. |
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284 | 283 | cursor.movePosition(QtGui.QTextCursor.Right) |
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285 | 284 | cursor.insertText(' ', QtGui.QTextCharFormat()) |
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286 | 285 | |
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287 | 286 | def appendPlainText(self, text): |
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288 | 287 | """ Reimplemented to not append text as a new paragraph, which doesn't |
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289 | 288 | make sense for a console widget. Also, if enabled, handle ANSI |
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290 | 289 | codes. |
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291 | 290 | """ |
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292 | 291 | cursor = self._get_end_cursor() |
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293 | 292 | if self.ansi_codes: |
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294 | 293 | for substring in self._ansi_processor.split_string(text): |
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295 | 294 | format = self._ansi_processor.get_format() |
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296 | 295 | cursor.insertText(substring, format) |
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297 | 296 | else: |
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298 | 297 | cursor.insertText(text) |
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299 | 298 | |
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300 | 299 | def clear(self, keep_input=False): |
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301 | 300 | """ Reimplemented to write a new prompt. If 'keep_input' is set, |
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302 | 301 | restores the old input buffer when the new prompt is written. |
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303 | 302 | """ |
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304 | 303 | QtGui.QPlainTextEdit.clear(self) |
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305 | 304 | if keep_input: |
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306 | 305 | input_buffer = self.input_buffer |
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307 | 306 | self._show_prompt() |
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308 | 307 | if keep_input: |
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309 | 308 | self.input_buffer = input_buffer |
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310 | 309 | |
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311 | 310 | def paste(self): |
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312 | 311 | """ Reimplemented to ensure that text is pasted in the editing region. |
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313 | 312 | """ |
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314 | 313 | self._keep_cursor_in_buffer() |
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315 | 314 | QtGui.QPlainTextEdit.paste(self) |
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316 | 315 | |
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317 | 316 | def print_(self, printer): |
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318 | 317 | """ Reimplemented to work around a bug in PyQt: the C++ level 'print_' |
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319 | 318 | slot has the wrong signature. |
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320 | 319 | """ |
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321 | 320 | QtGui.QPlainTextEdit.print_(self, printer) |
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322 | 321 | |
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323 | 322 | #--------------------------------------------------------------------------- |
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324 | 323 | # 'ConsoleWidget' public interface |
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325 | 324 | #--------------------------------------------------------------------------- |
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326 | 325 | |
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327 | 326 | def execute(self, source=None, hidden=False, interactive=False): |
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328 | 327 | """ Executes source or the input buffer, possibly prompting for more |
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329 | 328 | input. |
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330 | 329 | |
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331 | 330 | Parameters: |
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332 | 331 | ----------- |
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333 | 332 | source : str, optional |
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334 | 333 | |
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335 | 334 | The source to execute. If not specified, the input buffer will be |
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336 | 335 | used. If specified and 'hidden' is False, the input buffer will be |
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337 | 336 | replaced with the source before execution. |
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338 | 337 | |
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339 | 338 | hidden : bool, optional (default False) |
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340 | 339 | |
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341 | 340 | If set, no output will be shown and the prompt will not be modified. |
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342 | 341 | In other words, it will be completely invisible to the user that |
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343 | 342 | an execution has occurred. |
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344 | 343 | |
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345 | 344 | interactive : bool, optional (default False) |
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346 | 345 | |
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347 | 346 | Whether the console is to treat the source as having been manually |
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348 | 347 | entered by the user. The effect of this parameter depends on the |
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349 | 348 | subclass implementation. |
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350 | 349 | |
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351 | 350 | Raises: |
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352 | 351 | ------- |
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353 | 352 | RuntimeError |
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354 | 353 | If incomplete input is given and 'hidden' is True. In this case, |
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355 | 354 | it not possible to prompt for more input. |
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356 | 355 | |
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357 | 356 | Returns: |
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358 | 357 | -------- |
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359 | 358 | A boolean indicating whether the source was executed. |
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360 | 359 | """ |
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361 | 360 | if not hidden: |
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362 | 361 | if source is not None: |
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363 | 362 | self.input_buffer = source |
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364 | 363 | |
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365 | 364 | self.appendPlainText('\n') |
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366 | 365 | self._executing_input_buffer = self.input_buffer |
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367 | 366 | self._executing = True |
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368 | 367 | self._prompt_finished() |
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369 | 368 | |
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370 | 369 | real_source = self.input_buffer if source is None else source |
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371 | 370 | complete = self._is_complete(real_source, interactive) |
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372 | 371 | if complete: |
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373 | 372 | if not hidden: |
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374 | 373 | # The maximum block count is only in effect during execution. |
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375 | 374 | # This ensures that _prompt_pos does not become invalid due to |
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376 | 375 | # text truncation. |
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377 | 376 | self.setMaximumBlockCount(self.buffer_size) |
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378 | 377 | self._execute(real_source, hidden) |
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379 | 378 | elif hidden: |
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380 | 379 | raise RuntimeError('Incomplete noninteractive input: "%s"' % source) |
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381 | 380 | else: |
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382 | 381 | self._show_continuation_prompt() |
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383 | 382 | |
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384 | 383 | return complete |
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385 | 384 | |
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386 | 385 | def _get_input_buffer(self): |
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387 | 386 | """ The text that the user has entered entered at the current prompt. |
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388 | 387 | """ |
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389 | 388 | # If we're executing, the input buffer may not even exist anymore due to |
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390 | 389 | # the limit imposed by 'buffer_size'. Therefore, we store it. |
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391 | 390 | if self._executing: |
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392 | 391 | return self._executing_input_buffer |
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393 | 392 | |
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394 | 393 | cursor = self._get_end_cursor() |
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395 | 394 | cursor.setPosition(self._prompt_pos, QtGui.QTextCursor.KeepAnchor) |
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396 | 395 | input_buffer = str(cursor.selection().toPlainText()) |
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397 | 396 | |
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398 | 397 | # Strip out continuation prompts. |
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399 | 398 | return input_buffer.replace('\n' + self._continuation_prompt, '\n') |
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400 | 399 | |
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401 | 400 | def _set_input_buffer(self, string): |
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402 | 401 | """ Replaces the text in the input buffer with 'string'. |
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403 | 402 | """ |
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404 | 403 | # Remove old text. |
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405 | 404 | cursor = self._get_end_cursor() |
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406 | 405 | cursor.setPosition(self._prompt_pos, QtGui.QTextCursor.KeepAnchor) |
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407 | 406 | cursor.removeSelectedText() |
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408 | 407 | |
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409 | 408 | # Insert new text with continuation prompts. |
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410 | 409 | lines = string.splitlines(True) |
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411 | 410 | if lines: |
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412 | 411 | self.appendPlainText(lines[0]) |
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413 | 412 | for i in xrange(1, len(lines)): |
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414 | 413 | if self._continuation_prompt_html is None: |
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415 | 414 | self.appendPlainText(self._continuation_prompt) |
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416 | 415 | else: |
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417 | 416 | self.appendHtml(self._continuation_prompt_html) |
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418 | 417 | self.appendPlainText(lines[i]) |
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419 | 418 | self.moveCursor(QtGui.QTextCursor.End) |
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420 | 419 | |
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421 | 420 | input_buffer = property(_get_input_buffer, _set_input_buffer) |
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422 | 421 | |
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423 | 422 | def _get_input_buffer_cursor_line(self): |
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424 | 423 | """ The text in the line of the input buffer in which the user's cursor |
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425 | 424 | rests. Returns a string if there is such a line; otherwise, None. |
|
426 | 425 | """ |
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427 | 426 | if self._executing: |
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428 | 427 | return None |
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429 | 428 | cursor = self.textCursor() |
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430 | 429 | if cursor.position() >= self._prompt_pos: |
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431 | 430 | text = self._get_block_plain_text(cursor.block()) |
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432 | 431 | if cursor.blockNumber() == self._get_prompt_cursor().blockNumber(): |
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433 | 432 | return text[len(self._prompt):] |
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434 | 433 | else: |
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435 | 434 | return text[len(self._continuation_prompt):] |
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436 | 435 | else: |
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437 | 436 | return None |
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438 | 437 | |
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439 | 438 | input_buffer_cursor_line = property(_get_input_buffer_cursor_line) |
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440 | 439 | |
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441 | 440 | def _get_font(self): |
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442 | 441 | """ The base font being used by the ConsoleWidget. |
|
443 | 442 | """ |
|
444 | 443 | return self.document().defaultFont() |
|
445 | 444 | |
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446 | 445 | def _set_font(self, font): |
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447 | 446 | """ Sets the base font for the ConsoleWidget to the specified QFont. |
|
448 | 447 | """ |
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449 | 448 | font_metrics = QtGui.QFontMetrics(font) |
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450 | 449 | self.setTabStopWidth(self.tab_width * font_metrics.width(' ')) |
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451 | 450 | |
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452 | 451 | self._completion_widget.setFont(font) |
|
453 | 452 | self.document().setDefaultFont(font) |
|
454 | 453 | |
|
455 | 454 | font = property(_get_font, _set_font) |
|
456 | 455 | |
|
457 | 456 | def reset_font(self): |
|
458 | 457 | """ Sets the font to the default fixed-width font for this platform. |
|
459 | 458 | """ |
|
460 | 459 | if sys.platform == 'win32': |
|
461 | 460 | name = 'Courier' |
|
462 | 461 | elif sys.platform == 'darwin': |
|
463 | 462 | name = 'Monaco' |
|
464 | 463 | else: |
|
465 | 464 | name = 'Monospace' |
|
466 | 465 | font = QtGui.QFont(name, QtGui.qApp.font().pointSize()) |
|
467 | 466 | font.setStyleHint(QtGui.QFont.TypeWriter) |
|
468 | 467 | self._set_font(font) |
|
469 | 468 | |
|
470 | 469 | def _get_tab_width(self): |
|
471 | 470 | """ The width (in terms of space characters) for tab characters. |
|
472 | 471 | """ |
|
473 | 472 | return self._tab_width |
|
474 | 473 | |
|
475 | 474 | def _set_tab_width(self, tab_width): |
|
476 | 475 | """ Sets the width (in terms of space characters) for tab characters. |
|
477 | 476 | """ |
|
478 | 477 | font_metrics = QtGui.QFontMetrics(self.font) |
|
479 | 478 | self.setTabStopWidth(tab_width * font_metrics.width(' ')) |
|
480 | 479 | |
|
481 | 480 | self._tab_width = tab_width |
|
482 | 481 | |
|
483 | 482 | tab_width = property(_get_tab_width, _set_tab_width) |
|
484 | 483 | |
|
485 | 484 | #--------------------------------------------------------------------------- |
|
486 | 485 | # 'ConsoleWidget' abstract interface |
|
487 | 486 | #--------------------------------------------------------------------------- |
|
488 | 487 | |
|
489 | 488 | def _is_complete(self, source, interactive): |
|
490 | 489 | """ Returns whether 'source' can be executed. When triggered by an |
|
491 | 490 | Enter/Return key press, 'interactive' is True; otherwise, it is |
|
492 | 491 | False. |
|
493 | 492 | """ |
|
494 | 493 | raise NotImplementedError |
|
495 | 494 | |
|
496 | 495 | def _execute(self, source, hidden): |
|
497 | 496 | """ Execute 'source'. If 'hidden', do not show any output. |
|
498 | 497 | """ |
|
499 | 498 | raise NotImplementedError |
|
500 | 499 | |
|
501 | 500 | def _prompt_started_hook(self): |
|
502 | 501 | """ Called immediately after a new prompt is displayed. |
|
503 | 502 | """ |
|
504 | 503 | pass |
|
505 | 504 | |
|
506 | 505 | def _prompt_finished_hook(self): |
|
507 | 506 | """ Called immediately after a prompt is finished, i.e. when some input |
|
508 | 507 | will be processed and a new prompt displayed. |
|
509 | 508 | """ |
|
510 | 509 | pass |
|
511 | 510 | |
|
512 | 511 | def _up_pressed(self): |
|
513 | 512 | """ Called when the up key is pressed. Returns whether to continue |
|
514 | 513 | processing the event. |
|
515 | 514 | """ |
|
516 | 515 | return True |
|
517 | 516 | |
|
518 | 517 | def _down_pressed(self): |
|
519 | 518 | """ Called when the down key is pressed. Returns whether to continue |
|
520 | 519 | processing the event. |
|
521 | 520 | """ |
|
522 | 521 | return True |
|
523 | 522 | |
|
524 | 523 | def _tab_pressed(self): |
|
525 | 524 | """ Called when the tab key is pressed. Returns whether to continue |
|
526 | 525 | processing the event. |
|
527 | 526 | """ |
|
528 | 527 | return False |
|
529 | 528 | |
|
530 | 529 | #-------------------------------------------------------------------------- |
|
531 | 530 | # 'ConsoleWidget' protected interface |
|
532 | 531 | #-------------------------------------------------------------------------- |
|
533 | 532 | |
|
534 | 533 | def _append_html_fetching_plain_text(self, html): |
|
535 | 534 | """ Appends 'html', then returns the plain text version of it. |
|
536 | 535 | """ |
|
537 | 536 | anchor = self._get_end_cursor().position() |
|
538 | 537 | self.appendHtml(html) |
|
539 | 538 | cursor = self._get_end_cursor() |
|
540 | 539 | cursor.setPosition(anchor, QtGui.QTextCursor.KeepAnchor) |
|
541 | 540 | return str(cursor.selection().toPlainText()) |
|
542 | 541 | |
|
543 | 542 | def _append_plain_text_keeping_prompt(self, text): |
|
544 | 543 | """ Writes 'text' after the current prompt, then restores the old prompt |
|
545 | 544 | with its old input buffer. |
|
546 | 545 | """ |
|
547 | 546 | input_buffer = self.input_buffer |
|
548 | 547 | self.appendPlainText('\n') |
|
549 | 548 | self._prompt_finished() |
|
550 | 549 | |
|
551 | 550 | self.appendPlainText(text) |
|
552 | 551 | self._show_prompt() |
|
553 | 552 | self.input_buffer = input_buffer |
|
554 | 553 | |
|
555 | 554 | def _control_down(self, modifiers): |
|
556 | 555 | """ Given a KeyboardModifiers flags object, return whether the Control |
|
557 | 556 | key is down (on Mac OS, treat the Command key as a synonym for |
|
558 | 557 | Control). |
|
559 | 558 | """ |
|
560 | 559 | down = bool(modifiers & QtCore.Qt.ControlModifier) |
|
561 | 560 | |
|
562 | 561 | # Note: on Mac OS, ControlModifier corresponds to the Command key while |
|
563 | 562 | # MetaModifier corresponds to the Control key. |
|
564 | 563 | if sys.platform == 'darwin': |
|
565 | 564 | down = down ^ bool(modifiers & QtCore.Qt.MetaModifier) |
|
566 | 565 | |
|
567 | 566 | return down |
|
568 | 567 | |
|
569 | 568 | def _complete_with_items(self, cursor, items): |
|
570 | 569 | """ Performs completion with 'items' at the specified cursor location. |
|
571 | 570 | """ |
|
572 | 571 | if len(items) == 1: |
|
573 | 572 | cursor.setPosition(self.textCursor().position(), |
|
574 | 573 | QtGui.QTextCursor.KeepAnchor) |
|
575 | 574 | cursor.insertText(items[0]) |
|
576 | 575 | elif len(items) > 1: |
|
577 | 576 | if self.gui_completion: |
|
578 | 577 | self._completion_widget.show_items(cursor, items) |
|
579 | 578 | else: |
|
580 | 579 | text = self.format_as_columns(items) |
|
581 | 580 | self._append_plain_text_keeping_prompt(text) |
|
582 | 581 | |
|
583 |
def format_as_columns(self, items, separator=' ' |
|
|
582 | def format_as_columns(self, items, separator=' '): | |
|
584 | 583 | """ Transform a list of strings into a single string with columns. |
|
585 | 584 | |
|
586 | 585 | Parameters |
|
587 | 586 | ---------- |
|
588 | 587 | items : sequence [str] |
|
589 | 588 | The strings to process. |
|
590 | 589 | |
|
591 | 590 | separator : str, optional [default is two spaces] |
|
592 | 591 | The string that separates columns. |
|
593 | 592 | |
|
594 | vertical: bool, optional [default True] | |
|
595 | If set, consecutive items will be arranged from top to bottom, then | |
|
596 | from left to right. Otherwise, consecutive items will be aranged | |
|
597 | from left to right, then from top to bottom. | |
|
598 | ||
|
599 | 593 | Returns |
|
600 | 594 | ------- |
|
601 | 595 | The formatted string. |
|
602 | 596 | """ |
|
597 | # Note: this code is adapted from columnize 0.3.2. | |
|
598 | # See http://code.google.com/p/pycolumnize/ | |
|
599 | ||
|
603 | 600 | font_metrics = QtGui.QFontMetrics(self.font) |
|
604 | width = self.width() / font_metrics.width(' ') | |
|
605 | return columnize(items, displaywidth=width, | |
|
606 | colsep=separator, arrange_vertical=vertical) | |
|
601 | displaywidth = max(5, (self.width() / font_metrics.width(' ')) - 1) | |
|
602 | ||
|
603 | # Some degenerate cases | |
|
604 | size = len(items) | |
|
605 | if size == 0: | |
|
606 | return "\n" | |
|
607 | elif size == 1: | |
|
608 | return '%s\n' % str(items[0]) | |
|
609 | ||
|
610 | # Try every row count from 1 upwards | |
|
611 | array_index = lambda nrows, row, col: nrows*col + row | |
|
612 | for nrows in range(1, size): | |
|
613 | ncols = (size + nrows - 1) // nrows | |
|
614 | colwidths = [] | |
|
615 | totwidth = -len(separator) | |
|
616 | for col in range(ncols): | |
|
617 | # Get max column width for this column | |
|
618 | colwidth = 0 | |
|
619 | for row in range(nrows): | |
|
620 | i = array_index(nrows, row, col) | |
|
621 | if i >= size: break | |
|
622 | x = items[i] | |
|
623 | colwidth = max(colwidth, len(x)) | |
|
624 | colwidths.append(colwidth) | |
|
625 | totwidth += colwidth + len(separator) | |
|
626 | if totwidth > displaywidth: | |
|
627 | break | |
|
628 | if totwidth <= displaywidth: | |
|
629 | break | |
|
630 | ||
|
631 | # The smallest number of rows computed and the max widths for each | |
|
632 | # column has been obtained. Now we just have to format each of the rows. | |
|
633 | string = '' | |
|
634 | for row in range(nrows): | |
|
635 | texts = [] | |
|
636 | for col in range(ncols): | |
|
637 | i = row + nrows*col | |
|
638 | if i >= size: | |
|
639 | texts.append('') | |
|
640 | else: | |
|
641 | texts.append(items[i]) | |
|
642 | while texts and not texts[-1]: | |
|
643 | del texts[-1] | |
|
644 | for col in range(len(texts)): | |
|
645 | texts[col] = texts[col].ljust(colwidths[col]) | |
|
646 | string += "%s\n" % str(separator.join(texts)) | |
|
647 | return string | |
|
607 | 648 | |
|
608 | 649 | def _get_block_plain_text(self, block): |
|
609 | 650 | """ Given a QTextBlock, return its unformatted text. |
|
610 | 651 | """ |
|
611 | 652 | cursor = QtGui.QTextCursor(block) |
|
612 | 653 | cursor.movePosition(QtGui.QTextCursor.StartOfBlock) |
|
613 | 654 | cursor.movePosition(QtGui.QTextCursor.EndOfBlock, |
|
614 | 655 | QtGui.QTextCursor.KeepAnchor) |
|
615 | 656 | return str(cursor.selection().toPlainText()) |
|
616 | 657 | |
|
617 | 658 | def _get_end_cursor(self): |
|
618 | 659 | """ Convenience method that returns a cursor for the last character. |
|
619 | 660 | """ |
|
620 | 661 | cursor = self.textCursor() |
|
621 | 662 | cursor.movePosition(QtGui.QTextCursor.End) |
|
622 | 663 | return cursor |
|
623 | 664 | |
|
624 | 665 | def _get_prompt_cursor(self): |
|
625 | 666 | """ Convenience method that returns a cursor for the prompt position. |
|
626 | 667 | """ |
|
627 | 668 | cursor = self.textCursor() |
|
628 | 669 | cursor.setPosition(self._prompt_pos) |
|
629 | 670 | return cursor |
|
630 | 671 | |
|
631 | 672 | def _get_selection_cursor(self, start, end): |
|
632 | 673 | """ Convenience method that returns a cursor with text selected between |
|
633 | 674 | the positions 'start' and 'end'. |
|
634 | 675 | """ |
|
635 | 676 | cursor = self.textCursor() |
|
636 | 677 | cursor.setPosition(start) |
|
637 | 678 | cursor.setPosition(end, QtGui.QTextCursor.KeepAnchor) |
|
638 | 679 | return cursor |
|
639 | 680 | |
|
640 | 681 | def _get_word_start_cursor(self, position): |
|
641 | 682 | """ Find the start of the word to the left the given position. If a |
|
642 | 683 | sequence of non-word characters precedes the first word, skip over |
|
643 | 684 | them. (This emulates the behavior of bash, emacs, etc.) |
|
644 | 685 | """ |
|
645 | 686 | document = self.document() |
|
646 | 687 | position -= 1 |
|
647 | 688 | while self._in_buffer(position) and \ |
|
648 | 689 | not document.characterAt(position).isLetterOrNumber(): |
|
649 | 690 | position -= 1 |
|
650 | 691 | while self._in_buffer(position) and \ |
|
651 | 692 | document.characterAt(position).isLetterOrNumber(): |
|
652 | 693 | position -= 1 |
|
653 | 694 | cursor = self.textCursor() |
|
654 | 695 | cursor.setPosition(position + 1) |
|
655 | 696 | return cursor |
|
656 | 697 | |
|
657 | 698 | def _get_word_end_cursor(self, position): |
|
658 | 699 | """ Find the end of the word to the right the given position. If a |
|
659 | 700 | sequence of non-word characters precedes the first word, skip over |
|
660 | 701 | them. (This emulates the behavior of bash, emacs, etc.) |
|
661 | 702 | """ |
|
662 | 703 | document = self.document() |
|
663 | 704 | end = self._get_end_cursor().position() |
|
664 | 705 | while position < end and \ |
|
665 | 706 | not document.characterAt(position).isLetterOrNumber(): |
|
666 | 707 | position += 1 |
|
667 | 708 | while position < end and \ |
|
668 | 709 | document.characterAt(position).isLetterOrNumber(): |
|
669 | 710 | position += 1 |
|
670 | 711 | cursor = self.textCursor() |
|
671 | 712 | cursor.setPosition(position) |
|
672 | 713 | return cursor |
|
673 | 714 | |
|
674 | 715 | def _prompt_started(self): |
|
675 | 716 | """ Called immediately after a new prompt is displayed. |
|
676 | 717 | """ |
|
677 | 718 | # Temporarily disable the maximum block count to permit undo/redo and |
|
678 | 719 | # to ensure that the prompt position does not change due to truncation. |
|
679 | 720 | self.setMaximumBlockCount(0) |
|
680 | 721 | self.setUndoRedoEnabled(True) |
|
681 | 722 | |
|
682 | 723 | self.setReadOnly(False) |
|
683 | 724 | self.moveCursor(QtGui.QTextCursor.End) |
|
684 | 725 | self.centerCursor() |
|
685 | 726 | |
|
686 | 727 | self._executing = False |
|
687 | 728 | self._prompt_started_hook() |
|
688 | 729 | |
|
689 | 730 | def _prompt_finished(self): |
|
690 | 731 | """ Called immediately after a prompt is finished, i.e. when some input |
|
691 | 732 | will be processed and a new prompt displayed. |
|
692 | 733 | """ |
|
693 | 734 | self.setUndoRedoEnabled(False) |
|
694 | 735 | self.setReadOnly(True) |
|
695 | 736 | self._prompt_finished_hook() |
|
696 | 737 | |
|
697 | 738 | def _readline(self, prompt='', callback=None): |
|
698 | 739 | """ Reads one line of input from the user. |
|
699 | 740 | |
|
700 | 741 | Parameters |
|
701 | 742 | ---------- |
|
702 | 743 | prompt : str, optional |
|
703 | 744 | The prompt to print before reading the line. |
|
704 | 745 | |
|
705 | 746 | callback : callable, optional |
|
706 | 747 | A callback to execute with the read line. If not specified, input is |
|
707 | 748 | read *synchronously* and this method does not return until it has |
|
708 | 749 | been read. |
|
709 | 750 | |
|
710 | 751 | Returns |
|
711 | 752 | ------- |
|
712 | 753 | If a callback is specified, returns nothing. Otherwise, returns the |
|
713 | 754 | input string with the trailing newline stripped. |
|
714 | 755 | """ |
|
715 | 756 | if self._reading: |
|
716 | 757 | raise RuntimeError('Cannot read a line. Widget is already reading.') |
|
717 | 758 | |
|
718 | 759 | if not callback and not self.isVisible(): |
|
719 | 760 | # If the user cannot see the widget, this function cannot return. |
|
720 | 761 | raise RuntimeError('Cannot synchronously read a line if the widget' |
|
721 | 762 | 'is not visible!') |
|
722 | 763 | |
|
723 | 764 | self._reading = True |
|
724 | 765 | self._show_prompt(prompt, newline=False) |
|
725 | 766 | |
|
726 | 767 | if callback is None: |
|
727 | 768 | self._reading_callback = None |
|
728 | 769 | while self._reading: |
|
729 | 770 | QtCore.QCoreApplication.processEvents() |
|
730 | 771 | return self.input_buffer.rstrip('\n') |
|
731 | 772 | |
|
732 | 773 | else: |
|
733 | 774 | self._reading_callback = lambda: \ |
|
734 | 775 | callback(self.input_buffer.rstrip('\n')) |
|
735 | 776 | |
|
736 | 777 | def _reset(self): |
|
737 | 778 | """ Clears the console and resets internal state variables. |
|
738 | 779 | """ |
|
739 | 780 | QtGui.QPlainTextEdit.clear(self) |
|
740 | 781 | self._executing = self._reading = False |
|
741 | 782 | |
|
742 | 783 | def _set_continuation_prompt(self, prompt, html=False): |
|
743 | 784 | """ Sets the continuation prompt. |
|
744 | 785 | |
|
745 | 786 | Parameters |
|
746 | 787 | ---------- |
|
747 | 788 | prompt : str |
|
748 | 789 | The prompt to show when more input is needed. |
|
749 | 790 | |
|
750 | 791 | html : bool, optional (default False) |
|
751 | 792 | If set, the prompt will be inserted as formatted HTML. Otherwise, |
|
752 | 793 | the prompt will be treated as plain text, though ANSI color codes |
|
753 | 794 | will be handled. |
|
754 | 795 | """ |
|
755 | 796 | if html: |
|
756 | 797 | self._continuation_prompt_html = prompt |
|
757 | 798 | else: |
|
758 | 799 | self._continuation_prompt = prompt |
|
759 | 800 | self._continuation_prompt_html = None |
|
760 | 801 | |
|
761 | 802 | def _set_position(self, position): |
|
762 | 803 | """ Convenience method to set the position of the cursor. |
|
763 | 804 | """ |
|
764 | 805 | cursor = self.textCursor() |
|
765 | 806 | cursor.setPosition(position) |
|
766 | 807 | self.setTextCursor(cursor) |
|
767 | 808 | |
|
768 | 809 | def _set_selection(self, start, end): |
|
769 | 810 | """ Convenience method to set the current selected text. |
|
770 | 811 | """ |
|
771 | 812 | self.setTextCursor(self._get_selection_cursor(start, end)) |
|
772 | 813 | |
|
773 | 814 | def _show_prompt(self, prompt=None, html=False, newline=True): |
|
774 | 815 | """ Writes a new prompt at the end of the buffer. |
|
775 | 816 | |
|
776 | 817 | Parameters |
|
777 | 818 | ---------- |
|
778 | 819 | prompt : str, optional |
|
779 | 820 | The prompt to show. If not specified, the previous prompt is used. |
|
780 | 821 | |
|
781 | 822 | html : bool, optional (default False) |
|
782 | 823 | Only relevant when a prompt is specified. If set, the prompt will |
|
783 | 824 | be inserted as formatted HTML. Otherwise, the prompt will be treated |
|
784 | 825 | as plain text, though ANSI color codes will be handled. |
|
785 | 826 | |
|
786 | 827 | newline : bool, optional (default True) |
|
787 | 828 | If set, a new line will be written before showing the prompt if |
|
788 | 829 | there is not already a newline at the end of the buffer. |
|
789 | 830 | """ |
|
790 | 831 | # Insert a preliminary newline, if necessary. |
|
791 | 832 | if newline: |
|
792 | 833 | cursor = self._get_end_cursor() |
|
793 | 834 | if cursor.position() > 0: |
|
794 | 835 | cursor.movePosition(QtGui.QTextCursor.Left, |
|
795 | 836 | QtGui.QTextCursor.KeepAnchor) |
|
796 | 837 | if str(cursor.selection().toPlainText()) != '\n': |
|
797 | 838 | self.appendPlainText('\n') |
|
798 | 839 | |
|
799 | 840 | # Write the prompt. |
|
800 | 841 | if prompt is None: |
|
801 | 842 | if self._prompt_html is None: |
|
802 | 843 | self.appendPlainText(self._prompt) |
|
803 | 844 | else: |
|
804 | 845 | self.appendHtml(self._prompt_html) |
|
805 | 846 | else: |
|
806 | 847 | if html: |
|
807 | 848 | self._prompt = self._append_html_fetching_plain_text(prompt) |
|
808 | 849 | self._prompt_html = prompt |
|
809 | 850 | else: |
|
810 | 851 | self.appendPlainText(prompt) |
|
811 | 852 | self._prompt = prompt |
|
812 | 853 | self._prompt_html = None |
|
813 | 854 | |
|
814 | 855 | self._prompt_pos = self._get_end_cursor().position() |
|
815 | 856 | self._prompt_started() |
|
816 | 857 | |
|
817 | 858 | def _show_continuation_prompt(self): |
|
818 | 859 | """ Writes a new continuation prompt at the end of the buffer. |
|
819 | 860 | """ |
|
820 | 861 | if self._continuation_prompt_html is None: |
|
821 | 862 | self.appendPlainText(self._continuation_prompt) |
|
822 | 863 | else: |
|
823 | 864 | self._continuation_prompt = self._append_html_fetching_plain_text( |
|
824 | 865 | self._continuation_prompt_html) |
|
825 | 866 | |
|
826 | 867 | self._prompt_started() |
|
827 | 868 | |
|
828 | 869 | def _in_buffer(self, position): |
|
829 | 870 | """ Returns whether the given position is inside the editing region. |
|
830 | 871 | """ |
|
831 | 872 | return position >= self._prompt_pos |
|
832 | 873 | |
|
833 | 874 | def _keep_cursor_in_buffer(self): |
|
834 | 875 | """ Ensures that the cursor is inside the editing region. Returns |
|
835 | 876 | whether the cursor was moved. |
|
836 | 877 | """ |
|
837 | 878 | cursor = self.textCursor() |
|
838 | 879 | if cursor.position() < self._prompt_pos: |
|
839 | 880 | cursor.movePosition(QtGui.QTextCursor.End) |
|
840 | 881 | self.setTextCursor(cursor) |
|
841 | 882 | return True |
|
842 | 883 | else: |
|
843 | 884 | return False |
|
844 | 885 | |
|
845 | 886 | |
|
846 | 887 | class HistoryConsoleWidget(ConsoleWidget): |
|
847 | 888 | """ A ConsoleWidget that keeps a history of the commands that have been |
|
848 | 889 | executed. |
|
849 | 890 | """ |
|
850 | 891 | |
|
851 | 892 | #--------------------------------------------------------------------------- |
|
852 | 893 | # 'QObject' interface |
|
853 | 894 | #--------------------------------------------------------------------------- |
|
854 | 895 | |
|
855 | 896 | def __init__(self, parent=None): |
|
856 | 897 | super(HistoryConsoleWidget, self).__init__(parent) |
|
857 | 898 | |
|
858 | 899 | self._history = [] |
|
859 | 900 | self._history_index = 0 |
|
860 | 901 | |
|
861 | 902 | #--------------------------------------------------------------------------- |
|
862 | 903 | # 'ConsoleWidget' public interface |
|
863 | 904 | #--------------------------------------------------------------------------- |
|
864 | 905 | |
|
865 | 906 | def execute(self, source=None, hidden=False, interactive=False): |
|
866 | 907 | """ Reimplemented to the store history. |
|
867 | 908 | """ |
|
868 | 909 | if not hidden: |
|
869 | 910 | history = self.input_buffer if source is None else source |
|
870 | 911 | |
|
871 | 912 | executed = super(HistoryConsoleWidget, self).execute( |
|
872 | 913 | source, hidden, interactive) |
|
873 | 914 | |
|
874 | 915 | if executed and not hidden: |
|
875 | 916 | self._history.append(history.rstrip()) |
|
876 | 917 | self._history_index = len(self._history) |
|
877 | 918 | |
|
878 | 919 | return executed |
|
879 | 920 | |
|
880 | 921 | #--------------------------------------------------------------------------- |
|
881 | 922 | # 'ConsoleWidget' abstract interface |
|
882 | 923 | #--------------------------------------------------------------------------- |
|
883 | 924 | |
|
884 | 925 | def _up_pressed(self): |
|
885 | 926 | """ Called when the up key is pressed. Returns whether to continue |
|
886 | 927 | processing the event. |
|
887 | 928 | """ |
|
888 | 929 | prompt_cursor = self._get_prompt_cursor() |
|
889 | 930 | if self.textCursor().blockNumber() == prompt_cursor.blockNumber(): |
|
890 | 931 | self.history_previous() |
|
891 | 932 | |
|
892 | 933 | # Go to the first line of prompt for seemless history scrolling. |
|
893 | 934 | cursor = self._get_prompt_cursor() |
|
894 | 935 | cursor.movePosition(QtGui.QTextCursor.EndOfLine) |
|
895 | 936 | self.setTextCursor(cursor) |
|
896 | 937 | |
|
897 | 938 | return False |
|
898 | 939 | return True |
|
899 | 940 | |
|
900 | 941 | def _down_pressed(self): |
|
901 | 942 | """ Called when the down key is pressed. Returns whether to continue |
|
902 | 943 | processing the event. |
|
903 | 944 | """ |
|
904 | 945 | end_cursor = self._get_end_cursor() |
|
905 | 946 | if self.textCursor().blockNumber() == end_cursor.blockNumber(): |
|
906 | 947 | self.history_next() |
|
907 | 948 | return False |
|
908 | 949 | return True |
|
909 | 950 | |
|
910 | 951 | #--------------------------------------------------------------------------- |
|
911 | 952 | # 'HistoryConsoleWidget' interface |
|
912 | 953 | #--------------------------------------------------------------------------- |
|
913 | 954 | |
|
914 | 955 | def history_previous(self): |
|
915 | 956 | """ If possible, set the input buffer to the previous item in the |
|
916 | 957 | history. |
|
917 | 958 | """ |
|
918 | 959 | if self._history_index > 0: |
|
919 | 960 | self._history_index -= 1 |
|
920 | 961 | self.input_buffer = self._history[self._history_index] |
|
921 | 962 | |
|
922 | 963 | def history_next(self): |
|
923 | 964 | """ Set the input buffer to the next item in the history, or a blank |
|
924 | 965 | line if there is no subsequent item. |
|
925 | 966 | """ |
|
926 | 967 | if self._history_index < len(self._history): |
|
927 | 968 | self._history_index += 1 |
|
928 | 969 | if self._history_index < len(self._history): |
|
929 | 970 | self.input_buffer = self._history[self._history_index] |
|
930 | 971 | else: |
|
931 | 972 | self.input_buffer = '' |
|
1 | NO CONTENT: file was removed |
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