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47 lines
1.3 KiB
47 lines
1.3 KiB
#!/bin/sh |
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# Define ask_yn, which asks a yes or no question and defaults to the specified choice. |
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# Outputs 1 for yes and 0 for no |
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ask_yn() { |
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default=${2:-"y"} |
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default=$(echo "$default" | tr '[:upper:]' '[:lower:]') |
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if [ "$default" = "y" ]; then |
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prompt="${1} (Y/n): " |
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default_output=1 |
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else |
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prompt="${1} (y/N): " |
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default_output=0 |
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fi |
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while true; do |
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# Show prompt and get user input |
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printf "%s" "$prompt" |
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if [ "$(uname)" = "Darwin" ]; then |
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# On macOS, use "read -n 1" |
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read -n 1 -r REPLY |
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else |
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# On Linux and others, use "read -n 1 -s" |
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read -r -n 1 -s REPLY |
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fi |
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# If user hits Ctrl+C or Enter, break and return default output |
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if [ -z "$REPLY" ] || [ "$REPLY" = "$(printf '\003')" ]; then |
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REPLY=$default |
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printf "\n" |
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break |
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fi |
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case "$REPLY" in |
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y|Y ) printf "\n"; return 1;; |
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n|N ) printf "\n"; return 0;; |
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* ) printf "\nInvalid input. Please type 'y' or 'n'.";; |
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esac |
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done |
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return $default_output |
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} |
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# Call the function if this script is being run directly |
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if [ "${BASH_SOURCE[0]}" = "$0" ]; then |
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ask_yn "$@" |
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fi |