On json syntaxe error, pretty-print the fragment where the issue occure

json_verif_pp

#!/usr/bin/ruby

require 'json'

mess=File.read(ARGV.first).split(/\r?\n/).join("").gsub(/\s\s+/," ")
loop {
  JSON.parse(mess) rescue break
  exit(0)
}
loop {
  a=mess[/({[^{]*?},?)/,1]
  break unless a
  JSON.parse(a.gsub(/,$/,"")) rescue puts("Error json #{$!} : #{$!.to_s.size<30 ? a : ''}")
  mess=mess.gsub(a,'')
}
JSON.parse(mess.gsub(/,$/,"")) rescue puts("Error json #{$!}") if mess.strip.size>0
exit(1)