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- *REM This batch file is Freeware, free to use and redistribute unmodified *
- *REM Jouni Miettunen * jon@stekt.oulu.fi * Oulu * Finland * Europe * 1992 *
-
- REM Clear screen while preserving command line as it is.
- REM Timestamp 15-Nov-1992
-
- REM Note: *must* disable before using any program. Use at your own risk.
- REM Note: there are a lot of troubles here, check end of this file.
-
- REM Need ANSI.SYS compatible driver being able to redefine keyboard keys
- REM and a grep command (you might want to replace it with find).
-
- iff %_ansi==0 then^echo Need ANSI device driver^goto end^endiff
-
- REM iff "%@search[find]"=="" then^echo Need FIND command^goto end^endiff
- iff "%@search[fgrep]"=="" then^echo Need FGREP command^goto end^endiff
-
- REM Is insert ON/OFF? Let's hope default setting is current setting, too.
- REM setdos|*find "MODE="|set INSERT=%@substr[%@line[con,0],0,-1]
-
- setdos|*fgrep -csx1 "MODE="|set INSERT=%@substr[%@line[con,0],0,-1]
- iff "%INSERT"=="0" then^set INSERT=;0;82;^else^set INSERT=;^endiff
-
- REM enable unixlike control-l. Note: *never* use inside any program. Never.
-
- iff %@len[%@alias[·]] == 0 then
- echos e[12;0;79;32;32;32;32;32;0;71%[INSERT]250;11;"·";13p
- alias ·=keystack "*cls" 13 @73 10 @73 4 8 8 8 8 8 @71 @83 @79
- echo Unixlike Ctrl-L ON
- echo e[0;1;5;31;40m
- echo ╔════════════════════════════════════════════════════════════════════════════╗
- echo ║ e[0;1;37;40mNote: e[33m*must*e[37m be disabled before starting any program. e[33mUse at your own risk.e[5;31;40m║
- echo ╚════════════════════════════════════════════════════════════════════════════╝
- echos e[0m
-
- else
-
- REM disable unixlike control-l
-
- echos e[12;12p
- unalias ·
- echos Unixlike Ctrl-L OFF
- endiff
-
- :end
- quit
-
- REM troublestroublestroublestroublestroublestroublestroublestroublestroubles:
-
- REM problem1: what if command line is empty?
- rem easy to fix, but depends on HistMin, which is.. now hardcoded to le 6
-
- REM problem2: what if there is another command just alike? how exit history?
- rem use unlikely chars, but what is unlikely somewhere else? Works here.
-
- REM problem3: what if command is preceded by "@" and doesn't get recorded?
- rem always insert 1 char in front (why not more? flickering..)
-
- rem problem w/all above is limited command line lenght. Not likely to occur,
- rem but if it does, control-l refuses to work, thanx to 4DOS.
-
- REM problem4: is Insert on or off?
- rem now hoping default setting is a correct guess.
- rem if guessed wrong, will delete first character on command line.
-
- REM problem4: how do I know, if key redefinition is allowed?
- rem ...
-
- REM trouble1: screen flickering (maybe e[8m etc.?). getting serious.
- rem can I reduce size of history window? hide it? re-set screen contrast?
-
- REM trouble2: how to select unique alias name? Now hardcoded to "·"
- rem could try to misuse %@time[] in a loop until unique alias name found
- rem then had to write that alias name into this file to remember it
-
- REM Why Ctrl-Enter aka Ctrl-j doesn't work in string to-be-echoed?
- rem echos e[12;32;32;32;32;32;0;71;0;82;250;11;"*cls";13;0;73;10;0;73;4;8;8;8;8;8:0;71;0;83;79;13p
- rem alias tmps=1
- rem maybe fixed in 4dos 4.01 rev D ?
-
- REM WARNING: Why it is dangerous to use this batch file *and* start a program?
-
- rem Because after you have run this batch file once, control-l is no more just
- rem control-l, but instead a command string, which includes cursor movements,
- rem character inserting and character deleting. When you run this batch file
- rem for the second time, control-l will be restored back to just control-l.
-
- REM Note: some Trojan Horses use key redefinition to erase hard disks.
-
- rem If you have ANSI.SYS driver, which allows keyboard redefinition, *never*
- rem "type" text files, always use text editor/viewer until you know there are
- rem no suspicious ANSI escape sequencies. And read batch files before running
- rem them. If you can't find out exactly what they do, don't run them. Do you
- rem know what this batch file does? 4DOS has build-in "list" file viewer.
-
- rem nnans992.zip is extremely fast ansi.sys replacement, which by default
- rem *does not* allow keyboard redefinitions. Home users encouraged, business
- rem users required US$10 right-to-use license. Check SIMTEL20 msdos/screen/
-