105 lines
3.0 KiB
Bash
Executable File
105 lines
3.0 KiB
Bash
Executable File
#=== FUNCTION ================================================================
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# NAME: read_value
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# DESCRIPTION: Read a value from STDIN and handle errors.
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# PARAMETERS: 1 - Prompt string for the read
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# 2 - Name of variable to receive the result
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# 3 - Default value (optional)
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# RETURNS: 1 on error, otherwise 0
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#===============================================================================
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read_value () {
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local prompt="${1:?Usage: read_value prompt outputname [default]}"
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local outputname="${2:?Usage: read_value prompt outputname [default]}"
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local default="${3:-}"
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local var
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if [[ $default != "" ]]; then
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default="-i \"$default\""
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fi
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#
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# Read (with eval to ensure everything's substituted properly)
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#
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eval "read -e $default -p '$prompt' var"
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res="$?"
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if [[ $res -ne 0 ]]; then
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echo "Read aborted"
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return 1
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fi
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#
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# Return the value in the nominated variable
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#
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var="${var//\"/}"
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eval "$outputname=\"$var\""
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return 0
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}
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#=== FUNCTION ================================================================
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# NAME: check_value
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# DESCRIPTION: Checks a value against a list of regular expressions
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# PARAMETERS: 1 - the value to be checked
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# 2..n - valid regular expressions
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# RETURNS: 0 if the value checks, otherwise 1
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#===============================================================================
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check_value () {
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local value="${1:?Usage: check_value value [list_of_regex]}"
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local matches=0
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#
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# Drop parameter 1 then there should be more
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#
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shift
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if [[ $# == 0 ]]; then
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echo "Usage: check_value value [list_of_regex]"
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return 1
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fi
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#
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# Loop through the regex args checking the value, counting matches
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#
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while [[ $# -ge 1 ]]
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do
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if [[ $value =~ $1 ]]; then
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(( matches++ ))
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fi
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shift
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done
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#
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# No matches, then the value is bad
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#
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if [[ $matches == 0 ]]; then
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return 1
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else
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return 0
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fi
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}
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#=== FUNCTION ================================================================
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# NAME: read_and_check
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# DESCRIPTION: Reads a value (see read_value) and checks it (see check_value)
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# against an arbitrary long list of Bash regular expressions
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# PARAMETERS: 1 - Prompt string for the read
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# 2 - Name of variable to receive the result
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# 3 - Default value (optional)
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# 4..n - Valid regular expressions
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# RETURNS: Nothing
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#===============================================================================
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read_and_check () {
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local prompt="${1:?Usage: read_and_check prompt outputname [default]}"
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local outputname="${2:?Usage: read_and_check prompt outputname [default]}"
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local default="${3:-}"
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read_value "$prompt" "$outputname" "$default"
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shift 3
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until check_value "${!outputname}" $*
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do
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echo "Invalid input: ${!outputname}"
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read_value "$prompt" "$outputname" "$default"
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done
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return
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}
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