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manuel-192
63 lines
1.5 KiB
Bash
Executable File
63 lines
1.5 KiB
Bash
Executable File
#!/bin/bash
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# After each second, show seconds remaining until this program exists.
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#
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# The output is displayed on one line.
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# Pressing any key will stop this program.
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#
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# Exit code is
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# - 0 if any regular key was pressed
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# - 130 if the program was interrupted with Ctrl-C
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# - 142 if timeout occurred
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#
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# Parameters:
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# $1 = number of seconds (integer) before the program exists
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# $2 = (optional) prompt to show before showing the remaining seconds
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printf2() { printf "$@" >&2 ; }
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ShowTime() {
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CountOfSubtrings() {
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# how many "substring"s there are in the given "string"
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local string="$1"
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local substring="$2"
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local length=${#string}
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local sublength=${#substring}
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string=${string//$substring/}
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local newlength=${#string}
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return $(( (length - newlength) / sublength ))
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}
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CountOfSubtrings "$prompt" "%s"
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case "$?" in
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1) printf2 "\r$prompt\r" "$s" ;;
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2) printf2 "\r$prompt\r" "$s" "$seconds" ;;
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*) printf2 "unsupported prompt '%s'\n" "$prompt" ;;
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esac
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}
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Main() {
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local -r seconds="$1"
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local prompt="$2"
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local s
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local ret=0
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local str=""
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[ -n "$prompt" ] || prompt="[Close in %s/%s seconds (or press a key to close)]"
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for ((s=seconds; s>0; s--)) ; do
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ShowTime
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read -t1 -n1 str
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ret=$?
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[ $ret -eq 0 ] && break
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done
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ShowTime
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if [ $ret -ne 0 ] || [ -n "$str" ] ; then
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printf2 "\n"
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fi
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return $ret
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}
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Main "$@"
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