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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,228 @@ | ||
| #!/usr/bin/env bash | ||
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| ############################################################################### | ||
| # | ||
| # demo-magic.sh | ||
| # | ||
| # Copyright (c) 2015-2022 Paxton Hare | ||
| # | ||
| # This script lets you script demos in bash. It runs through your demo script | ||
| # when you press ENTER. It simulates typing and runs commands. | ||
| # | ||
| ############################################################################### | ||
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| # the speed to simulate typing the text | ||
| TYPE_SPEED=20 | ||
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| # no wait after "p" or "pe" | ||
| NO_WAIT=false | ||
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| # if > 0, will pause for this amount of seconds before automatically proceeding with any p or pe | ||
| PROMPT_TIMEOUT=0 | ||
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| # don't show command number unless user specifies it | ||
| SHOW_CMD_NUMS=false | ||
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| # handy color vars for pretty prompts | ||
| BLACK="\033[0;30m" | ||
| BLUE="\033[0;34m" | ||
| GREEN="\033[0;32m" | ||
| GREY="\033[0;90m" | ||
| CYAN="\033[0;36m" | ||
| RED="\033[0;31m" | ||
| PURPLE="\033[0;35m" | ||
| BROWN="\033[0;33m" | ||
| WHITE="\033[0;37m" | ||
| BOLD="\033[1m" | ||
| COLOR_RESET="\033[0m" | ||
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| C_NUM=0 | ||
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| # prompt and command color which can be overriden | ||
| DEMO_PROMPT="$ " | ||
| DEMO_CMD_COLOR=$BOLD | ||
| DEMO_COMMENT_COLOR=$GREY | ||
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| ## | ||
| # prints the script usage | ||
| ## | ||
| function usage() { | ||
| echo -e "" | ||
| echo -e "Usage: $0 [options]" | ||
| echo -e "" | ||
| echo -e " Where options is one or more of:" | ||
| echo -e " -h Prints Help text" | ||
| echo -e " -d Debug mode. Disables simulated typing" | ||
| echo -e " -n No wait" | ||
| echo -e " -w Waits max the given amount of seconds before " | ||
| echo -e " proceeding with demo (e.g. '-w5')" | ||
| echo -e "" | ||
| } | ||
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| ## | ||
| # wait for user to press ENTER | ||
| # if $PROMPT_TIMEOUT > 0 this will be used as the max time for proceeding automatically | ||
| ## | ||
| function wait() { | ||
| if [[ "$PROMPT_TIMEOUT" == "0" ]]; then | ||
| read -rs | ||
| else | ||
| read -rst "$PROMPT_TIMEOUT" | ||
| fi | ||
| } | ||
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| ## | ||
| # print command only. Useful for when you want to pretend to run a command | ||
| # | ||
| # takes 1 param - the string command to print | ||
| # | ||
| # usage: p "ls -l" | ||
| # | ||
| ## | ||
| function p() { | ||
| if [[ ${1:0:1} == "#" ]]; then | ||
| cmd=$DEMO_COMMENT_COLOR$1$COLOR_RESET | ||
| else | ||
| cmd=$DEMO_CMD_COLOR$1$COLOR_RESET | ||
| fi | ||
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| # render the prompt | ||
| x=$(PS1="$DEMO_PROMPT" "$BASH" --norc -i </dev/null 2>&1 | sed -n '${s/^\(.*\)exit$/\1/p;}') | ||
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| # show command number is selected | ||
| if $SHOW_CMD_NUMS; then | ||
| printf "[$((++C_NUM))] $x" | ||
| else | ||
| printf "$x" | ||
| fi | ||
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| # wait for the user to press a key before typing the command | ||
| if [ $NO_WAIT = false ]; then | ||
| wait | ||
| fi | ||
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| if [[ -z $TYPE_SPEED ]]; then | ||
| echo -en "$cmd" | ||
| else | ||
| echo -en "$cmd" | pv -qL $[$TYPE_SPEED+(-2 + RANDOM%5)]; | ||
| fi | ||
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| # wait for the user to press a key before moving on | ||
| if [ $NO_WAIT = false ]; then | ||
| wait | ||
| fi | ||
| echo "" | ||
| } | ||
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| ## | ||
| # Prints and executes a command | ||
| # | ||
| # takes 1 parameter - the string command to run | ||
| # | ||
| # usage: pe "ls -l" | ||
| # | ||
| ## | ||
| function pe() { | ||
| # print the command | ||
| p "$@" | ||
| run_cmd "$@" | ||
| } | ||
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| ## | ||
| # print and executes a command immediately | ||
| # | ||
| # takes 1 parameter - the string command to run | ||
| # | ||
| # usage: pei "ls -l" | ||
| # | ||
| ## | ||
| function pei { | ||
| NO_WAIT=true pe "$@" | ||
| } | ||
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| ## | ||
| # Enters script into interactive mode | ||
| # | ||
| # and allows newly typed commands to be executed within the script | ||
| # | ||
| # usage : cmd | ||
| # | ||
| ## | ||
| function cmd() { | ||
| # render the prompt | ||
| x=$(PS1="$DEMO_PROMPT" "$BASH" --norc -i </dev/null 2>&1 | sed -n '${s/^\(.*\)exit$/\1/p;}') | ||
| printf "$x\033[0m" | ||
| read command | ||
| run_cmd "${command}" | ||
| } | ||
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| function run_cmd() { | ||
| function handle_cancel() { | ||
| printf "" | ||
| } | ||
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| trap handle_cancel SIGINT | ||
| stty -echoctl | ||
| eval $@ | ||
| stty echoctl | ||
| trap - SIGINT | ||
| } | ||
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| function check_pv() { | ||
| command -v pv >/dev/null 2>&1 || { | ||
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| echo "" | ||
| echo -e "${RED}##############################################################" | ||
| echo "# HOLD IT!! I require pv for simulated typing but it's " >&2 | ||
| echo "# not installed. Aborting." >&2; | ||
| echo -e "${RED}##############################################################" | ||
| echo "" | ||
| echo -e "${COLOR_RESET}Disable simulated typing: " | ||
| echo "" | ||
| echo -e " unset TYPE_SPEED" | ||
| echo "" | ||
| echo "Installing pv:" | ||
| echo "" | ||
| echo " Mac: $ brew install pv" | ||
| echo "" | ||
| echo " Other: https://www.ivarch.com/programs/pv.shtml" | ||
| echo "" | ||
| exit 1; | ||
| } | ||
| } | ||
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| # | ||
| # handle some default params | ||
| # -h for help | ||
| # -d for disabling simulated typing | ||
| # | ||
| while getopts ":dhncw:" opt; do | ||
| case $opt in | ||
| h) | ||
| usage | ||
| exit 1 | ||
| ;; | ||
| d) | ||
| unset TYPE_SPEED | ||
| ;; | ||
| n) | ||
| NO_WAIT=true | ||
| ;; | ||
| c) | ||
| SHOW_CMD_NUMS=true | ||
| ;; | ||
| w) | ||
| PROMPT_TIMEOUT=$OPTARG | ||
| ;; | ||
| esac | ||
| done | ||
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| ## | ||
| # Do not check for pv. This trusts the user to not set TYPE_SPEED later in the | ||
| # demo in which case an error will occur if pv is not installed. | ||
| ## | ||
| if [[ -n "$TYPE_SPEED" ]]; then | ||
| check_pv | ||
| fi |
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