pygments for graphql (see http://www.catchmecode.com/2013/03/custom-syntax-in-pygments.html)

graphqllexer#lexer.py

# -*- coding: utf-8 -*-
"""
    pygments.lexers.graphql
    ~~~~~~~~~~~~~~~~~~~~

    Lexers for GraphQL formats.

    :copyright: Copyright 2017 by Martin Zlámal.
    :license: BSD, see LICENSE for details.
"""

from pygments.lexer import RegexLexer
from pygments.token import *

__all__ = ['GraphqlLexer']


class GraphqlLexer(RegexLexer):
    """
    Lexer for GraphQL.
    """

    name = 'GraphQL'
    aliases = ['graphql', 'gql']
    filenames = ['*.graphql', '*.gql']
    mimetypes = ['application/graphql']

    tokens = {
        'root': [
            (r'#.*', Comment.Singline),
            (r'\.\.\.', Operator),
            (ur'"[\u0009\u000A\u000D\u0020-\uFFFF]*"', String.Double),
            (r'(-?0|-?[1-9][0-9]*)(\.[0-9]+[eE][+-]?[0-9]+|\.[0-9]+|[eE][+-]?[0-9]+)', Number.Float),
            (r'(-?0|-?[1-9][0-9]*)', Number.Integer),
            (r'\$+[_A-Za-z][_0-9A-Za-z]*', Name.Variable),
            (r'[_A-Za-z][_0-9A-Za-z]+\s?:', Text),
            (r'(type|query|mutation|@[a-z]+|on|true|false|null)\b', Keyword.Type),
            (r'[!$():=@\[\]{|}]+?', Punctuation),
            (r'[_A-Za-z][_0-9A-Za-z]*', Keyword),
            (r'(\s|,)', Text),
        ]
    }

run.sh

sudo apt install python-setuptools
sudo apt install python-pygments 
touch graphqllexer/__init__.py
sudo python setup.py develop     

setup.py

from setuptools import setup, find_packages
 
setup (
  name='graphqllexer',
  packages=find_packages(),
  entry_points =
  """
  [pygments.lexers]
  graphqllexer = graphqllexer.lexer:GraphqlLexer
  """,
)