내에서는 .profile터미널에서 문자열의 너비를 결정하는 스크립트를 호출합니다. 시스템 세트를 신뢰할 수없는 컴퓨터의 콘솔에 LC_CTYPE로그인 할 때 또는 원격으로 로그인하여 원격과 LC_CTYPE일치 할 수없는 경우 이것을 사용 합니다. 내 스크립트는 라이브러리를 호출하지 않고 터미널을 쿼리합니다. 왜냐하면 그것은 유스 케이스의 요점이기 때문입니다. 터미널의 인코딩을 결정하십시오.
이것은 여러 가지면에서 취약합니다.
- 디스플레이를 수정하므로 사용자 경험이 그리 좋지 않습니다.
- 다른 프로그램이 잘못된 시간에 무언가를 표시하면 경쟁 조건이 있습니다.
- 터미널이 응답하지 않으면 잠 깁니다. (몇 년 전 나는 이것을 개선하는 방법을 물 었지만 실제로 문제가되지 않았으므로 그 솔루션으로 전환하지 않았습니다. 응답하지 않는 터미널에서 만난 유일한 사례는 이
plink방법 을 사용하여 Linux 시스템에서 원격 파일에 액세스하는 Windows Emacs 이며 대신 방법 을 사용하여plinkx 해결했습니다 .)
사용 사례와 일치하거나 일치하지 않을 수 있습니다.
#! /bin/sh
if [ z"$ZSH_VERSION" = z ]; then :; else
emulate sh 2>/dev/null
fi
set -e
help_and_exit () {
cat <<EOF
Usage: $0 {-NUMBER|TEXT}
Find out the width of TEXT on the terminal.
LIMITATION: this program has been designed to work in an xterm. Only
xterm and sufficiently compatible terminals will work. If you think
this program may be blocked waiting for input from the the terminal,
try entering the characters "0n0n" (digit 0, lowercase letter n,
repeat).
Display TEXT and erase it. Find out the position of the cursor before
and after displaying TEXT so as to compute the width of TEXT. The width
is returned as the exit code of the program. A value of 100 is returned if
the text is wider than 100 columns.
TEXT may contain backslash-escapes: \\0DDD represents the byte whose numeric
value is DDD in octal. Use '\\\\' to include a single backslash character.
You may use -NUMBER instead of TEXT (if TEXT begins with a dash, use
"-- TEXT"). This selects one of the built-in texts that are designed
to discriminate between common encodings. The following table lists
supported values of NUMBER (leftmost column) and the widths of the
sample text in several encodings.
1 ASCII=0 UTF-8=2 latinN=3 8bits=4
EOF
exit
}
builtin_text () {
case $1 in
-*[!0-9]*)
echo 1>&2 "$0: bad number: $1"
exit 119;;
-1) # UTF8: {\'E\'e}; latin1: {\~A\~A\copyright}; ASCII: {}
text='\0303\0211\0303\0251';;
*)
echo 1>&2 "$0: there is no text number $1. Stop."
exit 118;;
esac
}
text=
if [ $# -eq 0 ]; then
help_and_exit 1>&2
fi
case "$1" in
--) shift;;
-h|--help) help_and_exit;;
-[0-9]) builtin_text "$1";;
-*)
echo 1>&2 "$0: unknown option: $1"
exit 119
esac
if [ z"$text" = z ]; then
text="$1"
fi
printf "" # test that it is there (abort on very old systems)
csi='\033['
dsr_cpr="${csi}6n" # Device Status Report --- Report Cursor Position
dsr_ok="${csi}5n" # Device Status Report --- Status Report
stty_save=`stty -g`
if [ z"$stty_save" = z ]; then
echo 1>&2 "$0: \`stty -g' failed ($?)."
exit 3
fi
initial_x=
final_x=
delta_x=
cleanup () {
set +e
# Restore terminal settings
stty "$stty_save"
# Restore cursor position (unless something unexpected happened)
if [ z"$2" = z ]; then
if [ z"$initial_report" = z ]; then :; else
x=`expr "${initial_report}" : "\\(.*\\)0"`
printf "%b" "${csi}${x}H"
fi
fi
if [ z"$1" = z ]; then
# cleanup was called explicitly, so don't exit.
# We use `trap : 0' rather than `trap - 0' because the latter doesn't
# work in older Bourne shells.
trap : 0
return
fi
exit $1
}
trap 'cleanup 120 no' 0
trap 'cleanup 129' 1
trap 'cleanup 130' 2
trap 'cleanup 131' 3
trap 'cleanup 143' 15
stty eol 0 eof n -echo
printf "%b" "$dsr_cpr$dsr_ok"
initial_report=`tr -dc \;0123456789`
# Get the initial cursor position. Time out if the terminal does not reply
# within 1 second. The trick of calling tr and sleep in a pipeline to put
# them in a process group, and using "kill 0" to kill the whole process
# group, was suggested by Stephane Gimenez at
# /unix/10698/timing-out-in-a-shell-script
#trap : 14
#set +e
#initial_report=`sh -c 'ps -t $(tty) -o pid,ppid,pgid,command >/tmp/p;
# { tr -dc \;0123456789 >&3; kill -14 0; } |
# { sleep 1; kill -14 0; }' 3>&1`
#set -e
#initial_report=`{ sleep 1; kill 0; } |
# { tr -dc \;0123456789 </dev/tty; kill 0; }`
if [ z"$initial_report" = z"" ]; then
# We couldn't read the initial cursor position, so abort.
cleanup 120
fi
# Write some text and get the final cursor position.
printf "%b%b" "$text" "$dsr_cpr$dsr_ok"
final_report=`tr -dc \;0123456789`
initial_x=`expr "$initial_report" : "[0-9][0-9]*;\\([0-9][0-9]*\\)0" || test $? -eq 1`
final_x=`expr "$final_report" : "[0-9][0-9]*;\\([0-9][0-9]*\\)0" || test $? -eq 1`
delta_x=`expr "$final_x" - "$initial_x" || test $? -eq 1`
cleanup
# Zsh has function-local EXIT traps, even in sh emulation mode. This
# is a long-standing bug.
trap : 0
if [ $delta_x -gt 100 ]; then
delta_x=100
fi
exit $delta_x
스크립트는 반환 상태에서 너비를 100으로 클리핑하여 반환합니다. 샘플 사용법 :
widthof -1
case $? in
0) export LC_CTYPE=C;; # 7-bit charset
2) locale_search .utf8 .UTF-8;; # utf8
3) locale_search .iso88591 .ISO8859-1 .latin1 '';; # 8-bit with nonprintable 128-159, we assume latin1
4) locale_search .iso88591 .ISO8859-1 .latin1 '';; # some full 8-bit charset, we assume latin1
*) export LC_CTYPE=C;; # weird charset
esac