a version comparator (e.g., "1.0.2" < "1.0.10")

mock-version-tags.txt

fixme
1.0.2
1.2.2.3
0.1
0.1.0.2
0.2
1.0
1.0.1.2
1.2.3
0.1.0.23
0.1.0.10
0.2-beta
0.1.0.2
2.0
0.2.0.4
0.2.0.3.1
1.5.2_05
1.5.2_04
1.5.2_10
1.6.0_01
2.0.0_02
1.0RC2
1.0RC1
3.1

version_comparator.rb

#!/usr/bin/env ruby

args = $*.to_a

if args.index("-c")
  ct = [args[args.index("-c") + 1].to_i, 1].max
end

tags = $stdin.to_a

tags.sort! {|a,b|
    a = a.split(/[\._]/)
    b = b.split(/[\._]/)
    
    def is_i(str)
      return str =~ /^\d+$/
    end
    
    c = 0
    
    for i in 0..([a.size, b.size].max)
      if i == a.size
        c = is_i(b[i]) ? -1 : 1
      elsif i == b.size
        c = is_i(a[i]) ? 1 : -1
      end
      
      if is_i(a[i]) && is_i(b[i])
        c = a[i].to_i <=> b[i].to_i
      elsif is_i(a[i])
        c = 1
      elsif is_i(b[i])
        c = -1
      elsif !a[i].nil? && !b[i].nil?
        c = a[i] <=> b[i]
      end
      
      break if c != 0
    end
    
    c
  }

if ct
  ct = [ct, tags.size].min
  tag_range = tags[-ct..-1]
  
  puts "LAST #{ct} VERSIONS:"
  tag_range.each {|i| puts "#{i}" }
else
  puts "LATEST VERSION: #{tags[-1]}"
end

VersionComparator.groovy

def versions = []
def f = new File('mock-version-tags.txt')
f.eachLine { versions << it }

def versionComparator = { a, b ->
  def VALID_TOKENS = /._/
  a = a.tokenize(VALID_TOKENS)
  b = b.tokenize(VALID_TOKENS)
  
  for (i in 0..<Math.max(a.size(), b.size())) {
    if (i == a.size()) {
      return b[i].isInteger() ? -1 : 1
    } else if (i == b.size()) {
      return a[i].isInteger() ? 1 : -1
    }
    
    if (a[i].isInteger() && b[i].isInteger()) {
      int c = (a[i] as int) <=> (b[i] as int)
      if (c != 0) {
        return c
      }
    } else if (a[i].isInteger()) {
      return 1
    } else if (b[i].isInteger()) {
      return -1
    } else {
      int c = a[i] <=> b[i]
      if (c != 0) {
        return c
      }
    }
  }
  
  return 0
}

versions.sort(versionComparator)

versionComparator.js

// for the Node.js crew:

function versionComparator(a, b){
  a = a.split(/[._]/);
  b = b.split(/[._]/);
  var mx = Math.max(a.length, b.length),
    isInt(n){
      return (n || '').match(/^\d+$/) !== null;
    },
    c = 0,
    ai, bi;
  
  for (var i = 0; i < mx; i++) {
    ai = a[i],
    bi = b[i];

    if(c !== 0) break;
    
    switch(i){
      case a.length:
        return isInt(ai) ? -1 : 1;
      case b.length:
        return isInt(bi) ? 1 : -1;
      default:
        var aiInt = isInt(ai),
          biInt = isInt(bi);
        if (aiInt && biInt) {
          ai = parseInt(ai);
          bi = parseInt(bi);
          c = ai === bi ? 0 : ai > bi ? 1 : -1;
          if (c !== 0) break;
        } else if (aiInt) {
          return 1;
        } else if (biInt) {
          return -1;
        } else {
          c = ai === bi ? 0 : ai > bi ? 1 : -1;
          break;
        }
    }
  }
  
  return c;
}