gistfile1.txt

body common control {
        bundlesequence => { "main" };
}

bundle agent main {
        vars:
                "notempty" string => "foo";
                "notempty2" string => "bar";
                "data_string" string => string_mustache("not empty = {{vars.main.notempty}} ; empty = {{^vars.main.empty}}default{{/vars.main.empty}} ; not empty with default = {{^vars.main.notempty2}}default{{/vars.main.notempty2}}");
        reports:
                any::
                        "$(data_string)";

}

$ cf-agent -K -f `pwd`/test.cf
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
R: $(data_string)
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.
 warning: Mustache sections can only take a boolean or a container (array or map) value, but section 'vars.main.notempty2' isn't getting one of those.



body common control {
        bundlesequence => { "main" };
}

bundle agent main {
        vars:
                "notempty" string => "foo";
                "data_string" string => string_mustache("not empty = {{vars.main.notempty}} ; empty = {{^vars.main.empty}}default{{/vars.main.empty}}");
        reports:
                any::
                        "$(data_string)";

}

$ cf-agent -K -f `pwd`/test.cf
R: not empty = foo ; empty = default