64 lines
1.7 KiB
Fish
64 lines
1.7 KiB
Fish
function class_version --argument-names class_file
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if not string match -q '*.class' "$class_file"
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echo "Expected a Java class file but got: $class_file"
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return 1
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end
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# Use the `file` command if available
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if command -q file
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command file "$class_file"
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return 0
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end
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javap -verbose "$class_file" | string match -rq 'major version: (?<major_version>\d+)'
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set -l version_name
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# https://en.wikipedia.org/wiki/Java_class_file#General_layout
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switch "$major_version"
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case 63
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set version_name 'Java SE 19'
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case 62
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set version_name 'Java SE 18'
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case 61
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set version_name 'Java SE 17'
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case 60
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set version_name 'Java SE 16'
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case 59
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set version_name 'Java SE 15'
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case 58
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set version_name 'Java SE 14'
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case 57
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set version_name 'Java SE 13'
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case 56
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set version_name 'Java SE 12'
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case 55
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set version_name 'Java SE 11'
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case 54
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set version_name 'Java SE 10'
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case 53
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set version_name 'Java SE 9'
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case 52
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set version_name 'Java SE 8'
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case 51
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set version_name 'Java SE 7'
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case 50
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set version_name 'Java SE 6.0'
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case 49
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set version_name 'Java SE 5.0'
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case 48
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set version_name 'JDK 1.4'
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case 47
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set version_name 'JDK 1.3'
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case 46
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set version_name 'JDK 1.2'
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case 45
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set version_name 'JDK 1.1'
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case '*'
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set version_name 'Unknown Java version'
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end
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echo "$version_name (major version $major_version)"
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end
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