/*
* To the extent that (a) it is convenient and (b) that I have completed
* development of this code, the behaviour of the Windowed interface in
* FXTerminal.cpp and of the console mode one in termed.c are compatible.
* The key-bindings are intended to be "emacs-like" so they support command
* to move backwards and forwards by characters and words, to delete
* characters or words, to adjust case and to scan up and down through a
* history. More elaborate variants on this idea would permit the user to
* re-assign key-bindings. I have not implemented that at all. Partly to
* try to keep my code simple and partly because I feel customised key-
* bindings are a source of terrible confusion.
*
* Because of my intended use for this code I have allocated some keys to
* menu shortcuts that will not be relevant to other people but that are
* useful to me. NOt all keys can and not all keys do work under both
* FXTerminal and termed environments. I annotate this key-list with a
* ($) for things not active under FXTerminal and with (!) for not active
* or incomplete under termed.
*
*
*
* KEYBOARD HANDLING
*
*
* Key-bindings that I hope to make work in both terminal and windowed mode,
* on both Unix/Linux, Microsoft Windows and the Macintosh.
*
* Note that ALT can be achieved either by holding the ALT key at the
* same time as the listed key, or by pressing ESC before the key.
*
* ALT takes priority over SHIFT, and Control takes priority over ALT so
* that a character is only treated as having one attribute. If it has none
* it just inserts itself.
*
* Where I put a "-" in this table it means that I do not define the meaning
* of the keystroke. In the short term at least that will either cause the
* keystroke to be ignored, inserted, or treated the same way as the
* corresponding character without Control or ALT. In the longer term I may
* assign behaviours to some of those keys. I also want to reserve the
* possibility of making keys with both Control and ALT have yet different
* effects.
*
*Key Control ALT
*
* @ Set Mark ($!) - (note this key is not
* always detected!)
* A To beginning - (also Home key)
* B Back char Back word (also left arrow key)
* C ^C interrupt Capitalise word
* D Delete forward Delete word (also the Delete key)
* Also ^D before any other input on a line sends EOF
* E To end [Edit menu] (!) (also End key)
* F Forward char Foward word (also right arrow key)
* G ^G interrupt/cancel input (!) - <<also escape search mode>>
*
* H Delete back Del word back
* I TAB [File menu] (!) (also TAB key)
* J Newline -
* K Kill line -
* L Clear screen Lowercase word
* M Newline [Module load menu] ($!)
* N Next history Search history next (also down arrow key)
* O Discard output (!?) [Font menu] (!)
*
* P Previous history Search history prev (also up arrow key)
* Q Resume output (!?) -
* R Redisplay [Break menu] (!)
* S Pause output (!?) [Switch menu] (!)
* T Transpose chars -
* U Undo($!)escape srch Uppercase word
* V Quoted insert ($!) -
* W Del Word back Copy region ($!)
*
* X eXtended command ($!)Obey command ($!)
* Y Yank (=Paste) (!) -
* Z Stop execution (!?) -
* [ =ESC: Meta prefix -
* \ Quit -
* ] - -
* _ - Copy previous word
* ^ Reinput (!) -
*
*
* Arrow etc keys...
*
* -> forward char/word
* <- backwards char/word
* ^ history prev/search history prev
* v history next/search history next
* home start line/start buffer
* end end line/end buffer
*
*
* The items shown as menus behave as follows:
*
* ALT-E C cut (all !)
* O copy
* P paste
* R reinput
* A select all
* L clear
* D redraw
* H home
* E end
* ALT-I R read (all !)
* S save
* L save selected text
* P print
* N print selected text
* X exit
* ALT-M &Module menu shortcut - load a module ($! not used here)
* ALT-O F select new font (all !)
* R reset to default font
* W reset font and window to default
* Alt-R C as ^C, interrupt current computation (all !)
* D as ^O, discard pending output
* G as ^G, interrupt & backtrace current computation
* P as ^S, pause output
* R as ^Q, resume output
* X as ^X, stop current computation
* ALT-S &Switch menu shortcut - flip a switch ($! not used here)
*
*/