blog/_includes/functions.html

{%- assign params = include -%}
{%- if params.func -%}
  {%- assign func = params.func -%}
{%- endif -%}

{%- assign include_path = func -%}
{%- assign path_array = include_path | split: '.' -%}
{%- if path_array.size == 1 -%}
  {%- assign include_path = include_path | append: '.html' -%}
{%- endif -%}

{%- if func == 'log' -%}
  {%- include functions/log.html level=include.level msg=include.msg -%}
{%- else -%}
  {%- assign include_path = 'functions/' | append: include_path -%}
  {%- include {{ include_path }} params=params-%}
{%- endif -%}

{%- if func != 'log' -%}
  {%- assign msg = '[function]['
    | append: {{func}}
    | append: '] '
    | append: {{return}}
    -%}
  {%- include functions.html func='log' level='info' -%}
{%- endif -%}