Aucb.119
fa.editor-p
utzoo!decvax!ucbvax!C70:editor-p
Mon Dec  7 12:18:04 1981
Insert Mode
>From LAWS@SRI-AI Mon Dec  7 11:35:28 1981
One of the advantages of an explicit insert mode is that you
can get it in several flavors.  Aside from the usual insert before
and append after distinction, you can also enter an insert mode
to

    Skip to the start (end) of the line and insert.

    Add a new line ahead of or after the one the cursor is on.

    Replace (overwrite) characters until the mode escape is typed.
    This is very handy for editing formatted material.

    Replace or insert a single character.

    Replace (or, in VI, "change") a word or other unit.  Very handy.
    A count can also be specified.

    Replace (or substitute) up to (or including) a specified character.

    Replace to the end (or back to the start) of the line.

    Erase the entire line and enter insertion mode to replace it.

VI manages to offer all of these options (except insert single character)
using only a few keys.  I find cw and C (change word and change to end of
line) to be among my most used commands.

Another feature of an insert mode, although of debatable value, is that
deletions can be limited to the text just inserted.  VI enforces this
distinction between ordinary text deletion and insert-mode deletion of the
just-inserted text.  I suppose the reason is to permit Control-U, the
whole-line erase character, to delete just the new text.

					-- Ken Laws
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