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  1. # This file provides some common functionality for the main scripts.  It is
  2. # designed to be sourced, rather than executed.
  3.  
  4. # Makes the script more robust in general.
  5. set -o errexit
  6. set -o nounset
  7. set -o pipefail
  8.  
  9. # ANSI escape codes for pretty terminal colors.
  10. readonly GREEN='\033[32;1m'
  11. readonly YELLOW="\033[33;1m"
  12. readonly RED="\033[31;1m"
  13. readonly RESET="\033[0m"
  14.  
  15. # Gives the user a "yes/no" prompt with the text from the first positional
  16. # parameter (if given).  If an affirmative response is received,
  17. # returns success; if a negative response is received, returns failure; if an
  18. # unrecognized response is received, the user is given the prompt again.  This
  19. # function always outputs to the terminal rather than stdout, so it is safe
  20. # to use from within functions that are expected to output their results.
  21. Prompt()
  22. {
  23.     # Only try to output the prompt message if it is given, so no newline is
  24. 	# printed if it isn't.
  25. 	[ $# -gt 0  ] && echo -e "$1" > /dev/tty
  26.  
  27. 	local Response
  28. 	echo -en "[${GREEN}Y${RESET}/${RED}N${RESET}] " > /dev/tty
  29. 	read Response
  30.  
  31. 	# For case insensitivity.
  32. 	Response="$(echo "$Response" | tr [A-Z] [a-z])"
  33.  
  34. 	if [[ "$Response" =~ ^y(es)?$ ]]; then true
  35. 	elif [[ "$Response" =~ ^no?$ ]]; then false
  36. 	else
  37. 		echo "I don't understand that response.  Try \"yes\" or \"no.\"" > /dev/tty
  38. 		# Keep pestering the user until he gives a valid response.
  39. 		Prompt
  40. 	fi
  41. }; readonly -f Prompt
  42.  
  43. # Outputs a string of shell code that will parse the program arguments for long options.
  44. # Example:
  45. #   # Let's say that the program was passed the arguments --One Two --Three.
  46. #   eval "$(OptionParser One Two Three)"
  47. #   echo $One # True.
  48. #   echo $Two # False.  The argument was not preceded by "--" on the command-line.
  49. #   echo $Three # False.  OptionParser stops on the first argument that isn't an
  50. #               # option, and Two wasn't an option.
  51. OptionParser()
  52. {
  53. 	if [ $# -ge 1 ]; then
  54. 		for OptionName in "$@"; do echo -n "$OptionName=false; "; done
  55. 		echo -n 'while [ $# -ge 1 ]; do case "$1" in'
  56. 		for OptionName in "$@"; do
  57. 			echo -n " '--$OptionName') $OptionName=true && shift ;;"
  58. 		done
  59. 		echo -n ' *) break ;; esac; done'
  60. 	fi
  61. }; readonly -f OptionParser
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/KKDqJE
language:
Bash (bash 5.0.3)
created:
7 days ago
visibility:
public

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