357 lines
8.4 KiB
Python
357 lines
8.4 KiB
Python
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#! /usr/local/python
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# A miniature multi-window editor using STDWIN's text objects.
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#
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# Usage: miniedit [file] ...
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#
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# The user interface is similar to that of the miniedit demo application
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# in C that comes with STDWIN.
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#
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# XXX need to comment the functions
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# XXX Not yet implemented:
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# disabling menu entries for inapplicable actions
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# Find operations
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import sys
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import stdwin
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from stdwinevents import *
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# Constant: list of WE_COMMAND events that (may) change the text buffer
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# so we can decide whether to set the 'changed' flag.
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# Note that it is possible for such a command to fail (a backspace
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# at the beginning of the buffer) but we'll set the changed flag anyway
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# -- it's too complicated to check this condition right now.
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#
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changing = [WC_RETURN, WC_TAB, WC_BACKSPACE]
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# The list of currently open windows;
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# this is maintained so we can stop when there are no windows left
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#
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windows = []
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# A note on window data attributes (set by open_window):
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#
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# w.textobject the window's text object
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# w.changed true when the window's text is changed
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# w.filename filename connected to the window; '' if none
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# Main program
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#
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def main():
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#
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# Set a reasonable default window size.
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# If we are using a fixed-width font this will open a 80x24 window;
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# for variable-width fonts we approximate this based on an average
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#
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stdwin.setdefwinsize(40*stdwin.textwidth('in'), 24*stdwin.lineheight())
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#
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# Create global menus (as local variables)
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#
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filemenu = make_file_menu(stdwin)
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editmenu = make_edit_menu(stdwin)
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findmenu = make_find_menu(stdwin)
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#
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# Get the list of files from the command line (maybe none)
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#
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files = sys.argv[1:]
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#
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# Open any files -- errors will be reported but do won't stop us
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#
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for filename in files:
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open_file(filename)
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#
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# If there were no files, or none of them could be opened,
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# put up a dialog asking for a filename
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#
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if not windows:
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try:
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open_dialog(None)
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except KeyboardInterrupt:
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pass # User cancelled
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#
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# If the dialog was cancelled, create an empty new window
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#
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if not windows:
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new_window(None)
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#
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# Main event loop -- stop when we have no open windows left
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#
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while windows:
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#
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# Get the next event -- ignore interrupts
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#
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try:
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type, window, detail = event = stdwin.getevent()
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except KeyboardInterrupt:
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type, window, detail = event = WE_NONE, None, None
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#
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# Event decoding switch
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#
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if not window:
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pass # Ignore such events
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elif type == WE_MENU:
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#
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# Execute menu operation
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#
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menu, item = detail
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try:
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menu.actions[item](window)
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except KeyboardInterrupt:
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pass # User cancelled
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elif type == WE_CLOSE:
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#
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# Close a window
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#
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try:
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close_dialog(window)
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except KeyboardInterrupt:
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pass # User cancelled
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elif type == WE_SIZE:
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#
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# A window was resized --
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# let the text object recompute the line breaks
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# and change the document size accordingly,
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# so scroll bars will work
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#
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fix_textsize(window)
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elif window.textobject.event(event):
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#
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# The event was eaten by the text object --
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# set the changed flag if not already set
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#
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if type == WE_CHAR or \
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type == WE_COMMAND and detail in changing:
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window.changed = 1
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fix_docsize(window)
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#
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# Delete all objects that may still reference the window
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# in the event -- this is needed otherwise the window
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# won't actually be closed and may receive further
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# events, which will confuse the event decoder
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#
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del type, window, detail, event
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def make_file_menu(object):
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menu = object.menucreate('File')
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menu.actions = []
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additem(menu, 'New', 'N', new_window)
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additem(menu, 'Open..', 'O', open_dialog)
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additem(menu, '', '', None)
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additem(menu, 'Save', 'S', save_dialog)
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additem(menu, 'Save As..', '', save_as_dialog)
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additem(menu, 'Save a Copy..', '', save_copy_dialog)
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additem(menu, 'Revert', 'R', revert_dialog)
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additem(menu, 'Quit', 'Q', quit_dialog)
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return menu
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def make_edit_menu(object):
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menu = object.menucreate('Edit')
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menu.actions = []
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additem(menu, 'Cut', 'X', do_cut)
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additem(menu, 'Copy', 'C', do_copy)
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additem(menu, 'Paste', 'V', do_paste)
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additem(menu, 'Clear', 'B', do_clear)
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additem(menu, 'Select All', 'A', do_select_all)
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return menu
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def make_find_menu(object):
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menu = object.menucreate('Find')
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menu.actions = []
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# XXX
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return menu
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def additem(menu, text, shortcut, function):
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if shortcut:
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menu.additem(text, shortcut)
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else:
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menu.additem(text)
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menu.actions.append(function)
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def open_dialog(current_ignored):
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filename = stdwin.askfile('Open file:', '', 0)
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open_file(filename)
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def open_file(filename):
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try:
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fp = open(filename, 'r')
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except RuntimeError:
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stdwin.message(filename + ': cannot open')
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return # Error, forget it
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try:
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contents = fp.read()
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except RuntimeError:
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stdwin.message(filename + ': read error')
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return # Error, forget it
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del fp # Close the file
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open_window(filename, filename, contents)
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def new_window(current_ignored):
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open_window('', 'Untitled', '')
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def open_window(filename, title, contents):
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try:
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window = stdwin.open(title)
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except RuntimeError:
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stdwin.message('cannot open new window')
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return # Error, forget it
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window.textobject = window.textcreate((0, 0), window.getwinsize())
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window.textobject.settext(contents)
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window.changed = 0
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window.filename = filename
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fix_textsize(window)
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windows.append(window)
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def quit_dialog(window):
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for window in windows[:]:
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close_dialog(window)
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def close_dialog(window):
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if window.changed:
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prompt = 'Save changes to ' + window.gettitle() + ' ?'
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if stdwin.askync(prompt, 1):
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save_dialog(window)
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if window.changed:
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return # Save failed (not) cancelled
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windows.remove(window)
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del window.textobject
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def save_dialog(window):
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if not window.filename:
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save_as_dialog(window)
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return
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if save_file(window, window.filename):
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window.changed = 0
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def save_as_dialog(window):
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prompt = 'Save ' + window.gettitle() + ' as:'
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filename = stdwin.askfile(prompt, window.filename, 1)
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if save_file(window, filename):
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window.filename = filename
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window.settitle(filename)
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window.changed = 0
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def save_copy_dialog(window):
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prompt = 'Save a copy of ' + window.gettitle() + ' as:'
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filename = stdwin.askfile(prompt, window.filename, 1)
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void = save_file(window, filename)
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def save_file(window, filename):
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try:
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fp = open(filename, 'w')
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except RuntimeError:
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stdwin.message(filename + ': cannot create')
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return 0
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contents = window.textobject.gettext()
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try:
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fp.write(contents)
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except RuntimeError:
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stdwin.message(filename + ': write error')
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return 0
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return 1
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def revert_dialog(window):
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if not window.filename:
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stdwin.message('This window has no file to revert from')
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return
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if window.changed:
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prompt = 'Really read ' + window.filename + ' back from file?'
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if not stdwin.askync(prompt, 1):
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return
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try:
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fp = open(window.filename, 'r')
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except RuntimeError:
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stdwin.message(filename + ': cannot open')
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return
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contents = fp.read()
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del fp # Close the file
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window.textobject.settext(contents)
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window.changed = 0
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fix_docsize(window)
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def fix_textsize(window):
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corner = window.getwinsize()
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area = (0, 0), (corner)
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window.textobject.move(area)
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fix_docsize(window)
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def fix_docsize(window):
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area = window.textobject.getrect()
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origin, corner = area
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width, height = corner
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window.setdocsize(0, height)
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def do_cut(window):
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selection = window.textobject.getfocustext()
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if not selection:
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stdwin.fleep() # Nothing to cut
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elif not window.setselection(WS_PRIMARY, selection):
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stdwin.fleep() # Window manager glitch...
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else:
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stdwin.rotatecutbuffers(1)
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stdwin.setcutbuffer(0, selection)
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window.textobject.replace('')
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window.changed = 1
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fix_docsize(window)
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def do_copy(window):
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selection = window.textobject.getfocustext()
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if not selection:
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stdwin.fleep() # Nothing to cut
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elif not window.setselection(WS_PRIMARY, selection):
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stdwin.fleep() # Window manager glitch...
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else:
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stdwin.rotatecutbuffers(1)
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stdwin.setcutbuffer(0, selection)
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def do_paste(window):
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selection = stdwin.getselection(WS_PRIMARY)
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if not selection:
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selection = stdwin.getcutbuffer(0)
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if not selection:
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stdwin.fleep() # Nothing to paste
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else:
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window.textobject.replace(selection)
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window.changed = 1
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fix_docsize(window)
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def do_clear(window):
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first, last = window.textobject.getfocus()
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if first == last:
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stdwin.fleep() # Nothing to clear
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else:
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window.textobject.replace('')
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window.changed = 1
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fix_docsize(window)
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def do_select_all(window):
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window.textobject.setfocus(0, 0x7fffffff) # XXX Smaller on the Mac!
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main()
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