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todo:
1) autobackup of things typed in.
idea: each cell change output to a stdio open file
in the save format, fflush() every so often...
(diffs w/r to the original file)
2) make sure ISVALID should <not> be used in place of checkbounds
in interp.c
3) hide range
4) block moving into range
5) chain cells w/ equations into a linked list or dependency tree
-have a top level eval, eval and UPDATE all lower nodes
6) an option to go into a ^R like <mode>
++data entry fields (highlight entry cells)....
++only allow entry in these cells....
7) don't redraw the whole screen all the time
(only cells that change, (in addition to what is in 'fixed #9'))
(Note: there was no #9 when I took this over, and I've renumbered
things since then, so I'm not sure what this is referring to - CRM)
8) add uemacs keybinding stuff
9) add uemacs macro language
10) add uemacs command completion
11) add undo
12) rewrite update() function in screen.c from scratch in a more sane manner
(the current one is buggy and a headache to debug)
13) add a command line option (possibly -g) to use sc as a sort of grep for
formatted or unformatted data in a file or list of files which will
output the whole row in which a given number or string is found,
formatted as with the write command.
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