README.md

Use a single jvm options file with multiple versions of Java. Simply prefix a line with a specification of which versions it should be included with.

• X:: emitted when target version is exactly X
• X-:: emitted when target version is at least X
• -Y:: emitted when target version is not greater than Y
• X-Y: emitted when target version is at least X and not greater than Y

    8:option that only works with java 8
  -11:option that is deprecated after java 11
 9-  :option that requires at least java 9
11-17:option for use in java 11 through 17
     :option that is always included
option without prefix that is always included

-- jvm.options

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 8 < jvm.options
option that only works with java 8
option that is deprecated after java 11
option that is always included
option without prefix that is always included
[success]

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 9 < jvm.options
option that is deprecated after java 11
option that requires at least java 9
option that is always included
option without prefix that is always included
[success]

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 10 < jvm.options
option that is deprecated after java 11
option that requires at least java 9
option that is always included
option without prefix that is always included
[success]

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 11 < jvm.options
option that is deprecated after java 11
option that requires at least java 9
option for use in java 11 through 17
option that is always included
option without prefix that is always included
[success]

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 12 < jvm.options
option that requires at least java 9
option for use in java 11 through 17
option that is always included
option without prefix that is always included
[success]

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 17 < jvm.options
option that requires at least java 9
option for use in java 11 through 17
option that is always included
option without prefix that is always included
[success]

╭─{ rye@perhaps:~/src/REDACTED }
╰─● ./filter_jvm_ops 18 < jvm.options
option that requires at least java 9
option that is always included
option without prefix that is always included
[success]

filter_jvm_ops.bash

#!/usr/bin/env bash

set -e

target_version="${1:?target version required!}"

while IFS= read -r line; do
  if [[ "${line}" =~ ^[[:blank:]]*([[:digit:]]+)?[[:blank:]]*(-)?[[:blank:]]*([[:digit:]]+)?[[:blank:]]*:(.*) ]]; then
    lo_bound="${BASH_REMATCH[1]}"
    operator="${BASH_REMATCH[2]}"
    up_bound="${BASH_REMATCH[3]}"
    content="${BASH_REMATCH[4]}"

    if [[ -z "${operator}" ]]; then
      : "${lo_bound:=${up_bound}}"
      : "${up_bound:=${lo_bound}}"
    fi

    if (( "${target_version}" >= "${lo_bound:-0}" && "${target_version}" <= "${up_bound:-9999}" )); then
      [[ -z "${DEBUG}" ]] || >&2 echo "INCLUDE[${target_version} in (${lo_bound}${operator:+-}${up_bound})]: ${line}"
      echo "${content}"
    else
      [[ -z "${DEBUG}" ]] || >&2 echo "EXCLUDE[${target_version} not in (${lo_bound}${operator:+-}${up_bound})]: ${line}"
    fi

  else
    [[ -z "${DEBUG}" ]] || >&2 echo "INCLUDE[no-bound]: ${line}"
    echo "${line}"
  fi
done