<?php

$debug = 5;
require '_debug.php';


# Pattern begins '/' foloowed by 1 or more characters that are not '/' or '.'
# In particular this blocks attempts to hack into system
#
# Example path '/article/market' will result in 'market' which we can try to 
# match with 'market.php' or 'market.md'

if (preg_match('#/([^/.]+)#',$_SERVER['PATH_INFO'], $m) === false) {
  http_response_code('400');
  echo "Request {$_SERVER['PATH_INFO']} malformed";
  exit;
}
$page = $m[1];

# Identify type of file as PHP or Markdown
if (file_exists($page . '.php')) {
  $file = $page . '.php';
  $type = 'php';
} else if (file_exists($page . '.md')) {
  $file = $page . '.md';
  $type = 'markdown';
} else {
  # Unknown or invalid path
  http_response_code('404');
  echo "File '$page' not found";
  exit;
}

debug("PAGE: $page\n"
     ."TYPE: $type\n"
     ."PATH: {$_SERVER['PATH_INFO']}\n");

# Load file, we do include rather than file_get_contents so PHP can be
# executed if needed
ob_start();
include __DIR__ . '/' . $file;
$contents = ob_get_clean();

# Split off head matter
#
# this pattern uses the 'ms' modifier to treat multiline strings as a
# single string, and let '\s', '.' etc treat newlines as whitespace
# I match an _optional_ HTML ( '<!-- nnnn -->') comment if we want to wrap
# the headmatter in a comment.
#
# The headmatter is delimited by either '----' or '++++' as per
# Markdown/yaml standards.
# Technical note that '+' is a regex character so \+{3,} instead of ++++
if (preg_match('/^(<!--\s*)?(-{3,}|\+{3,})(.*)(-{3,}|\+{3,})(-->)?(.*)/ms',$contents, $parts) === true) {
   $var_dump($parts);
}