73 lines
1.7 KiB
Bash
73 lines
1.7 KiB
Bash
#!/usr/bin/env bash
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#
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# A handy collection of tools to create interactive demos:
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# type(): simulates typing its arguments
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# execute(): simuates typing then executing its arguments in a shell
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# wait(): waits for user input with optional timeout
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# cmd(): gives control to user until she enters 'end' (or for a single command if you pass an argument)
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# color(): allows you to color (second argument, defaults to $clr) some text (first argument)
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#
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# Helpers (internal stuff):
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# simtyping(): let's data piped to it through at rates similar to typing
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# prompt(): prints the bash PS1 prompt on your system with a nasty hack
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TYPE_SPEED="${TYPE_SPEED:-15}"
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PROMPT_TIMEOUT="${PROMPT_TIMEOUT:--1}"
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# some colors
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def="\033[0;00m"
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wht="\033[1;37m"
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red="\033[0;31m"
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grn="\033[0;32m"
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blu="\033[0;34m"
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clr="$wht"
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function color()
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{
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printf "${2:-$clr}"
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printf "${1}"
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printf "${def}"
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}
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function simtyping()
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{ pv -qL $(($TYPE_SPEED+$((-2 + RANDOM%5)))); }
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function type()
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{ printf "$*" | simtyping; }
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function wait()
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{
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[ "$PROMPT_TIMEOUT" == "-1" ] &&
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read -rs ||
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read -rst "$PROMPT_TIMEOUT"
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}
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function prompt()
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{
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invalidcmd="somethingthatshouldbetotallynotacommandinanygivenenvironment"
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expPS1=$(echo $invalidcmd |
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bash --norc -i 2>&1 |
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grep $invalidcmd |
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head -n 1 |
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sed "s/$invalidcmd//g")
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printf "$expPS1"
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}
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function execute()
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{
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prompt
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type "$@" && wait
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printf "\n"
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eval "$@"
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}
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function cmd()
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{
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while : ; do
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prompt
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read -e command
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[ "$command" != "end" ] && eval "${command}" || break
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[ "$1" ] && break
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done
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}
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