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Elvis 1.4 DIFFERENCES BETWEEN ELVIS & BSD VI/EX Page 7-1
E7. DIFFERENCES BETWEEN ELVIS & BSD VI/EXF
E7.1 ExtensionsF
:mkexrc
:mk
This EX command saves the current :set and :map configurations
in the ".exrc" file in your current directory.
:Next
:previous
:N
:pre
These commands move backwards through the args list.
zz
In visual command mode, the (lowercase) "zz" command will center
the current line on the screen, like "z=".
.
The default count value for . is the same as the previous
command which . is meant to repeat. However, you can supply a new
count if you wish. For example, after "3dw", "." will delete 3
words, but "5." will delete 5 words.
".
The text which was most recently input (via a "cw" command, or
something similar) is saved in a cut buffer called ". (which is a
pretty hard name to write in an English sentence).
K
In visual command mode, you can move the cursor onto a word and
press shift-K to have Elvis run a reference program to look that
word up. This command alone is worth the price of admission! See
the ctags and ref programs.
#
In visual command mode, you can move the cursor onto a number
and then hit ## or #+ to increment that number by 1. To increment
it by a larger amount, type in the increment value before hitting
the initial #. The number can also be decremented or set by
hitting #- or #=, respectively.
input
You can backspace past the beginning of the line.
Elvis 1.4 DIFFERENCES BETWEEN ELVIS & BSD VI/EX Page 7-2
The arrow keys work in input mode.
If you type control-A, then the text that you input last time is
inserted. You will remain in input mode, so you can backspace over
part of it, or add more to it. (This is sort of like control-@ on
the real vi, except that control-A really works.)
Control-P will insert the contents of the cut buffer.
Real vi can only remember up to 128 characters of input, but
Elvis can remember any amount.
The ^T and ^D keys can adjust the indent of a line no matter
where the cursor happens to be in that line.
You can save your file and exit Elvis directly from input mode
by hitting control-Z twice.
Elvis supports digraphs as a way to enter non-ASCII characters.
:set inputmode
:se im
If you set this flag in your .exrc file, then elvis will start
up in input mode instead of visual command mode.
:set charattr
:se ca
Elvis can display "backslash-f" style character attributes on
the screen as you edit. The following example shows the recognized
atributes:
normal \fBboldface\fR \fIitalics\fR \fUunderlined\fR normal
NOTE: you must compile elvis without the -DNO_CHARATTR flag for
this to work.
:set sync
:se sy
After a crash, you can usually recover the altered form of the
file from the temporary file that Elvis uses. With the sync option
turned on, the odds are shifted a little more in your favor because
Elvis will perform a sync() call after each change has been written
to the temporary file.
cursor shape
Elvis changes the shape of the cursor to indicate which mode
you're in, if your terminal's termcap entry includes the necessary
capabilities.
:set hideformat
:se hf
Elvis 1.4 DIFFERENCES BETWEEN ELVIS & BSD VI/EX Page 7-3
This option hides format control lines. (They are displayed on
the screen as blank lines.)
:errlist
*
elvis -m
Elvis is clever enough to parse the error messages emitted by
many compilers. To use this feature, you should collect your
compiler's error messages into a file called "errlist"; elvis will
read this file, determine which source file caused the error
messages, start editing that file, move the cursor to the line
where the error was detected, and display the error message on the
status line. Nifty!
E7.2 OmissionsF
The replace mode is a hack. It doesn't save the text that it
overwrites.
Long lines are displayed differently -- where the real vi would
wrap a long line onto several rows of the screen, Elvis simply
displays part of the line, and allows you to scroll the screen
sideways to see the rest of it.
The ":preserve" and ":recover" commands are missing. So is the
-r flag. I've never had a good reason to use ":preserve", and
since ":recover" is used so rarely I decided to implement it as a
separate program. There's no need to load the recovery code into
memory every time you edit a file, I figured.
LISP support is missing.
Due to naming conventions used for the temporary files, Elvis
can be creating no more that one new file per directory at any
given time. Any number of existing files can be edited at the same
time on multitasking computer systems, but only one new file can be
created simultaneously per directory. To relieve this problem, you
would have to edit tmp.c and virec.c This is expected to be done in
version 1.5
Autoindent mode acts a little different from the real vi. It is
still quite useful, but if you frequently use both vi and elvis
then the differences may be annoying. Autoindent is -1gradually-0
improving.
The visual "put" command cannot be repeated by hitting the .
key.
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