#  Copyright 2021 Northern.tech AS
#  This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License as published by the
#  Free Software Foundation; version 3.
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
# To the extent this program is licensed as part of the Enterprise
# versions of Cfengine, the applicable Commercial Open Source License
# (COSL) may apply to this file if you as a licensee so wish it. See
# included file COSL.txt.
##+begin_src prep
#@ ```
#@ printf "[general]\n" > /tmp/instance.cfg
#@ printf "guid = 9CB197F0-4569-446A-A987-1DDEC1205F6B\n" >> /tmp/instance.cfg
#@ printf "port=5308" >> /tmp/instance.cfg
#@ ```
#+end_src
##############################################################################
#+begin_src cfengine3
bundle agent main
{
  vars:
    # the returned data container is a key-value map:
    # the whole matched string is put in key "0"
    # the first three characters are put in key "name1"
    # the next three characters go into key "2" (the capture has no name)
    # the next two characters go into key "3" (the capture has no name)
    # then the dash is ignored
    # then three characters are put in key "name2"
    # then another dash is ignored
    # the next three characters go into key "5" (the capture has no name)
    # anything else is ignored
    "parsed"
      data => data_regextract(
        "^(?<name1>...)(...)(..)-(?<name2>...)-(..).*",
        "abcdef12-345-67andsoon"
      );

    "parsed_str" string => format("%S", parsed);

    # Illustrating multiline regular expression
    "instance_guid_until_end_of_string"
      data => data_regextract(
        "^guid\s?+=\s?+(?<value>.*)$", readfile("/tmp/instance.cfg", 200)
      );

    "instance_guid"
      data => data_regextract(
        "^guid\s+=\s+(?<value>[^\n]*)", readfile("/tmp/instance.cfg", 200)
      );

    "instance_port"
      data => data_regextract(
        "^port\s?+=\s?+(?<value>[^\n]*)", readfile("/tmp/instance.cfg", 200)
      );

  reports:
    "$(this.bundle): parsed[0] '$(parsed[0])' parses into: $(parsed_str)";
    "$(this.bundle): instance_guid_until_end_of_string[value] '$(instance_guid_until_end_of_string[value])'";
    "$(this.bundle): instance_guid[value] '$(instance_guid[value])'";
    "$(this.bundle): instance_port[value] '$(instance_port[value])'";
}

#+end_src
###############################################################################
#+begin_src example_output
#@ ```
#@ R: main: parsed[0] 'abcdef12-345-67andsoon' parses into: {"0":"abcdef12-345-67andsoon","2":"def","3":"12","5":"67","name1":"abc","name2":"345"}
#@ R: main: instance_guid_until_end_of_string[value] '9CB197F0-4569-446A-A987-1DDEC1205F6B
#@ port=5308'
#@ R: main: instance_guid[value] '9CB197F0-4569-446A-A987-1DDEC1205F6B'
#@ R: main: instance_port[value] '5308'
#@ ```
#+end_src
