Routine folding: display and cursor movement issues
I've written some (experimental) code to implement folding. I just
wonder if I am "doing it right" and/or if there is "a better way".
I can't seem to google proper on this either ;-((.
To begin with, when, say, a routine from line 8 to 12 inclusive is
folded, I add an entry to the bookmark table (another goodie planned
for 0.2.2), of {FOLD,8,12}. Easy. I also have code to update this as
lines are inserted/deleted/etc.
The "internal" struggle (as in conceptually) is how I display from
line 1 to line 30 normally, but line 1 to 34 with a fold mark against
line 8, and more critically how I cursor up/down from line 8 to line
13 and vice versa, as well as paging up and down, and opening the
editor with eg the cursor on line 34 in the above described scenario
- so I need to start with line 1 of display as line 1of the file, not
line 4. (I plan to retain folds, btw).
So my question is: how would you store the (run-time) info:
a) a really packed table that is small but costs alot to scan,
(in practice I probably have to keep that anyway),
b) a full-on 1..length(filetext[currfile]) flag array (or two)
that scans really easy but costs an arm and a leg to update,
c) an array 1..visible lines (by default 1..len(f[c]), with
significant overheads as per or perhaps even worse than b,
d) some other scheme?
Hopefully,
Pete
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