collapseos/blk/101
Virgil Dupras 9ab5cda397 ed: rename I to i
Shadowing core "I" is too messy. As soon as ed is loaded in memory,
nothing else that isn't "i-aware" can be loaded anymore.

I guess that's why "contexts" exist in Starting Forth, but adding
this concept just for allowing the shadowing of core words seems
overkill to me. Renaming I to i in ed seems better.
2020-06-23 07:08:21 -04:00

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There are two buffers, IBUF (insert buffer) and FBUF (find
buffer). They are used as a typing target for the actions
described below. They both have a peculiar logic: when typing
is expected to fill a buffer, an empty value means "reuse
previous value". For example, typing "I foo I " inserts
"foofoo".
T ( n -- ): select line n for editing.
P xxx: put typed IBUF on selected line.
U xxx: insert typed IBUF on selected line.
F xxx: find typed FBUF in block, starting from current
position+1. If not found, don't move.
i xxx: insert typed IBUF at cursor. "i" is to avoid shadowing
core word "I".
Y: Copy n characters after cursor into IBUF, n being length of
FBUF. (cont.)