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/usr/share/highlight/langDefs/charmm.lang is in highlight-common 3.18-3.

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The actual contents of the file can be viewed below.

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Description="Charmm"

Keywords={
  {  Id=1,
   List={"if", "then", "set", "goto", "label", "stream", "increment", 
	"decrement", "rewind", "return", "endif", "define", "calc", "set", "stop",
	"gt", "ge", "eq", "ne", "le", "lt"
        }
  },
  { Id=2,
    List= { "merge", "merg", "hqbm", "update", "upda", "tmdinit", "tmdi", "print",
	  "prin", "nbonds", "nbon", "vibran", "vibr", "diag", "ic", "hbuild", "hbui",
	  "dynamics", "dyna", "shake", "shak", "energy", "ener", "mini", "crystal",
	  "crys", "image", "imag", "scalar", "scal", "generate", "gene", "delete",
	  "dele", "correl", "corr", "enter", "ente", "trajectory", "traj", "mantime",
	  "mant", "corfun", "corf", "end"

          }
  },
  { Id=3,
    Regex=[[^\s*(close|read|open|write)]]
  },
  { Id=4,
    Regex=[[ [@|\?|$]\w+ ]]
  }

}

Strings = {
  Delimiter=[["|'|`]]
}

Comments = {
   {
     Block=false,
     Delimiter = { [[\!]] }
   }
}

IgnoreCase=true

PreProcessor = {
  Prefix=[[^\*]]
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\.|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-|\~|\|]]

EnableIndentation=false