commit 15871c9f6b54631b143f13e606b0d0833704886a
Author: achmizs <1874748+achmizs@users.noreply.github.com>
Date:   Sat Dec 11 20:39:11 2021 -0500

    Initial commit

diff --git a/gist-embed.php b/gist-embed.php
new file mode 100644
index 0000000..d802b03
--- /dev/null
+++ b/gist-embed.php
@@ -0,0 +1,263 @@
+<?php if (!defined('PmWiki')) exit();
+/** \pastebin-embed.php
+  * \Copyright 2017-2021 Said Achmiz
+  * \Licensed under the MIT License
+  * \brief Embed Gists in a wikipage.
+  */
+
+$RecipeInfo['GistEmbed']['Version'] = '2018-10-19';
+
+## (:gist-embed:)
+Markup('gist-embed', '<fulltext', '/\\(:gist-embed\\s+(.+?)\\s*:\\)/', 'GistEmbed');
+
+SDV($GistEmbedHighlightStyle, "background-color: yellow;");
+
+function GistEmbed($m) {
+	static $id = 1;
+	
+	## Parse arguments to the markup.
+	$parsed = ParseArgs($m[1]);
+
+	## These are the "bare" arguments (ones which don't require a key, just value(s)).	
+	$args = $parsed[''];
+	$gist_id = $args[0];
+	$noJS = in_array('no-js', $args);
+	$noFooter = in_array('nofooter', $args);
+	$noLineNumbers = in_array('nolinenums', $args);
+	$raw = in_array('raw', $args);
+	$noPre = in_array('no-pre', $args);
+
+	## Check whether specific files are being specified.
+	$files = array();
+	if ($args[1] && !in_array($args[1], array('no-js', 'nofooter', 'nolinenums', 'raw', 'no-pre')))
+		$files = explode(',',$args[1]);
+	
+	## Convert the comma-delimited line ranges to an array containing each line to be
+	## included as values.
+	## Note that the line numbers will be zero-indexed (for use with raw text, etc.).
+	$line_ranges = $parsed['lines'] ? explode(',', $parsed['lines']) : array();
+	$line_numbers = array();
+	$to_end_from = -1;
+	foreach ($line_ranges as $key => $line_range) {
+		if (preg_match("/([0-9]+)[-–]([0-9]+)/", $line_range, $m)) {
+			$line_numbers = array_merge($line_numbers, range(--$m[1],--$m[2]));
+		} else if (preg_match("/([0-9]+)[-–]$/", $line_range, $m)) {
+			$line_numbers[] = $to_end_from = --$m[1];
+		} else {
+			$line_numbers[] = --$line_range;
+		}
+	}
+	
+	## Same thing, but for highlighted line ranges.
+	$hl_line_ranges = $parsed['hl'] ? explode(',', $parsed['hl']) : array();
+	$hl_line_numbers = array();
+	$hl_to_end_from = -1;
+	foreach ($hl_line_ranges as $key => $hl_line_range) {
+		if (preg_match("/([0-9]+)[-–]([0-9]+)/", $hl_line_range, $m)) {
+			$hl_line_numbers = array_merge($hl_line_numbers, range(--$m[1],--$m[2]));
+		} else if (preg_match("/([0-9]+)[-–]$/", $hl_line_range, $m)) {
+			$hl_line_numbers[] = $hl_to_end_from = --$m[1];
+		} else {
+			$hl_line_numbers[] = --$hl_line_range;
+		}
+	}
+	
+	$embed_js_url = "https://gist.github.com/$gist_id.js";
+	$embed_raw_url = "https://gist.github.com/$gist_id/raw/";
+	$embed_json_url = "https://gist.github.com/$gist_id.json";
+	
+	$out = "<span class='gist-embed-error'>Unknown error.</span>";
+	
+	if ($raw) {
+		## If no filenames have been specified, we'll have to retrieve the file list from
+		## the server; otherwise, we'll have no idea what files to request, and just 
+		## retrieving the 'raw' URL for a multi-file gist (with no file specified) gets
+		## the first file only...
+		if (empty($files)) {
+			$full_gist_data = json_decode(file_get_contents($embed_json_url),true);
+			$files = $full_gist_data['files'];
+		}
+		
+		## The raw text of each file of a multi-file gist must be retrieved individually.
+		$out = array();
+		foreach ($files as $filename) {
+			$raw_text = file_get_contents($embed_raw_url.$filename);
+			if (!$raw_text) return Keep("<span class='gist-embed-error'>Could not retrieve gist!</span>");
+			
+			$raw_lines = explode("\n", $raw_text);
+			## Convert HTML entities.
+			if (!$noPre) {
+				foreach ($raw_lines as $line)
+					$line = PVSE($line);
+			}
+			## Highlighting only works if no-pre is NOT enabled AND if we're displaying a 
+			## single file only.
+			if (!empty($hl_line_numbers) && !$noPre && count($files) == 1) {
+				if ($hl_to_end_from >= 0)
+					$hl_line_numbers = array_merge($hl_line_numbers, range($hl_to_end_from, count($raw_lines) - 1));
+				foreach ($hl_line_numbers as $l) {
+					$raw_lines[$l] = "<span class='gist-embed-highlighted-line'>" . rtrim($raw_lines[$l]) . "</span>";
+				}
+			}
+			## Specifying line numbers only works if we're displaying a single file only.
+			if (!empty($line_numbers) && count($files) == 1) {			
+				if ($to_end_from >= 0)
+					$line_numbers = array_merge($line_numbers, range($to_end_from, count($raw_lines) - 1));
+				$raw_lines = array_intersect_key($raw_lines, array_flip($line_numbers));
+			}
+			$raw_text = implode("\n", $raw_lines);
+			
+			## The 'no-pre' option means we shouldn't wrap the text in a <pre> tag.
+			$out[] = $noPre ? $raw_text : Keep("<pre class='escaped gistRaw' id='gistEmbed_$id_$filename'>\n" . $raw_text . "\n</pre>\n");
+		}
+		$out = implode($noPre ? "\n\n" : "", $out);
+	} else if ($noJS) {
+		include_once('simple_html_dom.php');
+	
+		$json_content = json_decode(file_get_contents($embed_json_url),true);
+				
+		## The style sheet.
+		global $HTMLHeaderFmt;
+		$HTMLHeaderFmt[] = "<link rel='stylesheet' type='text/css' href='" . $json_content['stylesheet'] . "' />\n";
+		
+		## The HTML.
+		$content_html = str_get_html(stripcslashes($json_content['div']));
+		$content = $content_html->find("div.gist", 0);
+		$content->id = "gistEmbed_$id";
+		
+		## If specific files are specified, we simply delete the div.gist-file containers
+		## that contain files we don't want.
+		if (!empty($files)) {
+			$file_ids = preg_replace("/\./", "-", $files);
+			$gist_file_blocks = $content_html->find("div.gist-file");
+			foreach ($gist_file_blocks as $gist_file_block) {
+				if (!in_array(substr($gist_file_block->find("div.file", 0)->id, 5), $file_ids))
+					$gist_file_block->outertext = '';
+			}
+		}
+		
+		## Specifying line numbers only works if we're displaying a single file only.
+		$displayed_gist_files = array_filter($content_html->find("div.gist-file"), function ($d) { return $d->outertext; });
+		if (!empty($line_numbers) && count($displayed_gist_files) == 1) {
+			$lines = reset($displayed_gist_files)->find(".js-file-line-container tr");
+			if ($to_end_from >= 0)
+				$line_numbers = array_merge($line_numbers, range($to_end_from, count($lines) - 1));
+			foreach ($lines as $l) {
+				$line_num =$l->childNodes(0)->getAttribute('data-line-number');
+				if (!in_array(--$line_num, $line_numbers))
+					$l->outertext = '';
+			}
+		}
+		
+		## Highlighting specific line numbers only works if we're display a single file 
+		## only.
+		if (!empty($hl_line_numbers) && count($displayed_gist_files) == 1) {
+			$lines = reset($displayed_gist_files)->find(".js-file-line-container tr");
+			if ($hl_to_end_from >= 0)
+				$hl_line_numbers = array_merge($hl_line_numbers, range($hl_to_end_from, count($lines) - 1));
+			foreach ($lines as $i => $line) {
+				if (in_array($i, $hl_line_numbers)) {
+					$line->children(1)->class .= " gist-embed-highlighted-line";
+				}
+			}
+		}
+		
+		$out = Keep($content);
+	} else {
+		$out = Keep("<script id='gistEmbedScript_$id' src='$embed_js_url'></script>");
+		
+		## If specific files are specified, we'll delete the div.gist-file containers 
+		## that contain files we don't want (this script will run right after the script
+		## that adds the content in the first place).
+		if (!empty($files)) {
+			$files_js = preg_replace("/\./", "-", "[ '".implode("', '",$files)."' ]");
+			$out .= Keep("
+<script>
+	var files = $files_js;
+	document.querySelector('#gistEmbedScript_$id').parentElement.nextSibling.querySelectorAll('div.gist-file').forEach(function (gist_file_block) {
+		if (files.indexOf(gist_file_block.querySelector('div.file').id.substring(5)) == -1)
+			gist_file_block.parentElement.removeChild(gist_file_block);
+	});	
+</script>
+			");
+		}
+		
+		## Specifying line numbers only works if we're displaying a single file only.
+		if (!empty($line_numbers) || !empty($hl_line_numbers)) {
+			$line_numbers_js = "[ ".implode(", ",$line_numbers)." ]";
+			$hl_line_numbers_js = "[ ".implode(", ",$hl_line_numbers)." ]";
+			$out .= Keep("
+<script>
+	if (document.querySelector('#gistEmbedScript_$id').parentElement.nextSibling.querySelectorAll('div.gist-file').length == 1) {
+		var num_lines = document.querySelector('#gistEmbedScript_$id').parentElement.nextSibling.querySelector('div.gist-file').querySelectorAll('.js-file-line-container tr').length;
+
+		var line_numbers = $line_numbers_js;
+		var to_end_from = $to_end_from;
+		if (to_end_from >= 0)
+			line_numbers = [...line_numbers, ...[...Array(num_lines - to_end_from)].map((_, i) => to_end_from + i)];
+
+		var hl_line_numbers = $hl_line_numbers_js;
+		var hl_to_end_from = $hl_to_end_from;
+		if (hl_to_end_from >= 0)
+			hl_line_numbers = [...hl_line_numbers, ...[...Array(num_lines - hl_to_end_from)].map((_, i) => hl_to_end_from + i)];
+
+		document.querySelector('#gistEmbedScript_$id').parentElement.nextSibling.querySelector('div.gist-file').querySelectorAll('.js-file-line-container tr').forEach(function (line, i) {
+			// Highlight specified line ranges (if any have been specified via the hl= parameter).
+			if (hl_line_numbers.indexOf(i) != -1)
+				line.children[1].className += ' gist-embed-highlighted-line';
+
+			// Filter specified line ranges (if any have been specified via the lines= parameter).
+			if (line_numbers.length > 0 && line_numbers.indexOf(i) == -1)
+				line.parentElement.removeChild(line);
+		});
+	}
+</script>
+			");
+		}
+		
+		GistEmbedAppendFooter();
+	}
+	
+	global $HTMLStylesFmt;
+	if (!$raw && $noFooter) {
+		$HTMLStylesFmt['gist-embed'][] = "#gistEmbed_$id .gist-meta { display: none; }\n";
+		$HTMLStylesFmt['gist-embed'][] = "#gistEmbed_$id .gist-data { border-bottom: none; border-radius: 2px; }\n";
+	}
+	if (!$raw && $noLineNumbers) {
+		$HTMLStylesFmt['gist-embed'][] = "#gistEmbed_$id td.js-line-number { display: none; }\n";
+	}
+
+	GistEmbedInjectStyles();
+	
+	$id++;
+	return $out;
+}
+
+function GistEmbedAppendFooter() {
+	static $ran_once = false;
+	if (!$ran_once) {
+		global $HTMLFooterFmt;
+		$HTMLFooterFmt[] = 
+"<script>
+	document.querySelectorAll('div.gist').forEach(function (embed) {
+		if (embed.previousSibling && embed.previousSibling.tagName == 'P') {
+			embed.id = 'gistEmbed_' + embed.previousSibling.firstChild.id.substring(16);
+		}
+	});
+</script>\n";
+	}
+	$ran_once = true;
+}
+
+function GistEmbedInjectStyles() {
+	static $ran_once = false;
+	if (!$ran_once) {
+		global $HTMLStylesFmt, $GistEmbedHighlightStyle;
+		$styles = "
+.gistRaw .gist-embed-highlighted-line { $GistEmbedHighlightStyle display: inline-block; width: calc(100% + 4px); padding-left: 4px; margin-left: -4px; }
+.gist tr .gist-embed-highlighted-line { $GistEmbedHighlightStyle }
+";
+		$HTMLStylesFmt['gist-embed'][] = $styles;
+	}
+	$ran_once = true;
+}