From cecb9dab4feb5848eb6c6e8351cfc6a6862fb970 Mon Sep 17 00:00:00 2001
From: Connor Thomson <blumatrikz@gmail.com>
Date: Sun, 20 Sep 2026 17:39:36 -0700
Subject: Add a preprocessor

---
 php/header.php     |  2 +-
 php/preprocess.php | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 php/render.php     |  6 ++--
 php/replace.php    | 14 +++++++--
 4 files changed, 99 insertions(+), 6 deletions(-)
 create mode 100755 php/preprocess.php

diff --git a/php/header.php b/php/header.php
index 37d0612..3f7279b 100755
--- a/php/header.php
+++ b/php/header.php
@@ -20,7 +20,7 @@
 require_once ROOT . '/php/replace.php';
 
 $targets = [
-    '{{navbar}}' => file_get_contents(ROOT . '/html/navbar.html')
+    '{{navbar}}' => import(ROOT . '/html/navbar.html')
 ];
 
 $html = replace(ROOT . '/html/header.html', $targets);
diff --git a/php/preprocess.php b/php/preprocess.php
new file mode 100755
index 0000000..ae1057a
--- /dev/null
+++ b/php/preprocess.php
@@ -0,0 +1,83 @@
+<?php
+/*
+ *  GNUfault.org - GNUfault's website
+ *  Copyright (C) 2026  Connor Thomson
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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 Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+function strip_comments(string $html): string {
+    return preg_replace('/<!--(?!\[if).*?-->/s', '', $html);
+}
+
+function tidy(string $html): string {
+    $html = preg_replace('/[^\S\n]+$/m', '', $html);
+    $html = preg_replace('/\n{3,}/', "\n\n", $html);
+
+    return trim($html, "\n");
+}
+
+function dedent(string $html): string {
+    $width = null;
+
+    foreach (explode("\n", $html) as $line) {
+        if (trim($line) === '') {
+            continue;
+        }
+
+        $leading = strlen($line) - strlen(ltrim($line, " \t"));
+
+        if ($width === null || $leading < $width) {
+            $width = $leading;
+        }
+    }
+
+    if (!$width) {
+        return $html;
+    }
+
+    return preg_replace('/^[ \t]{1,' . $width . '}/m', '', $html);
+}
+
+function indent(string $html, string $indent): string {
+    $html = dedent($html);
+
+    if ($indent === '') {
+        return $html;
+    }
+
+    $lines = explode("\n", $html);
+
+    foreach ($lines as $number => $line) {
+        if ($line !== '') {
+            $lines[$number] = $indent . $line;
+        }
+    }
+
+    return implode("\n", $lines);
+}
+
+function preprocess(string $html): string {
+    return tidy(strip_comments($html));
+}
+
+function import(string $path): string {
+    if (!file_exists($path)) {
+        return '';
+    }
+
+    return preprocess(file_get_contents($path));
+}
+
+?>
diff --git a/php/render.php b/php/render.php
index 8e63247..902d81b 100755
--- a/php/render.php
+++ b/php/render.php
@@ -24,16 +24,16 @@ function render_content(string $page) {
     $device = 'desktop';
 
     $targets = [
-        '{{stylesheets}}' => file_get_contents(ROOT . '/html/stylesheets.html'),
+        '{{stylesheets}}' => import(ROOT . '/html/stylesheets.html'),
         '{{header}}'      => execute(ROOT . '/php/header.php'),
-        '{{content}}'     => file_get_contents($page),
+        '{{content}}'     => import($page),
         '{{footer}}'      => execute(ROOT . '/php/footer.php'),
         '{{device}}'      => $device
     ];
 
     $main_html = replace(ROOT . '/html/main.html', $targets);
 
-    echo $main_html;
+    echo $main_html . "\n";
 }
 
 ?>
diff --git a/php/replace.php b/php/replace.php
index 9cdc5bf..dcc5fb6 100755
--- a/php/replace.php
+++ b/php/replace.php
@@ -17,14 +17,24 @@
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+require_once ROOT . '/php/preprocess.php';
+
 function replace(string $templatePath, array $replacements = []): string {
-    $html = file_get_contents($templatePath);
+    $html = import($templatePath);
 
     foreach ($replacements as $placeholder => $replacementValue) {
+        $replacementValue = tidy((string)$replacementValue);
+
+        $pattern = '/^([ \t]*)' . preg_quote($placeholder, '/') . '/m';
+
+        $html = preg_replace_callback($pattern, function (array $match) use ($replacementValue) {
+            return indent($replacementValue, $match[1]);
+        }, $html);
+
         $html = str_replace($placeholder, $replacementValue, $html);
     }
 
-    return $html;
+    return tidy($html);
 }
 
 ?>
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