ingredient/info: Add Fetcher concept

internal/wisski/ingredient/php/phpserver/server.php

@@ -0,0 +1,46 @@
+<?php
+
+// This file contains code to execute a php execution server.
+// It is passed as a *command line literal * directly to 'drush:script'.
+//
+// As such it is preprocessed and shortened.
+// It should only contain comments at the beginning of each line, and only starting with '//'.
+// See server.go.
+
+// prevent STDIN from being buffered
+stream_set_read_buffer(STDIN,0);
+
+// stop outputting errors when executing
+ob_start(null,0,PHP_OUTPUT_HANDLER_CLEANABLE);
+
+
+while(1){
+	// read the next line to get an end-of-line marker
+	$marker = fgets(STDIN);
+	if (!$marker) break;
+
+	// accumulate the buffer until the marker is reached
+	// bail out if there is an unexpected end of input
+	$buffer = "";
+	while(1) {
+		$line = fgets(STDIN);
+		if (!$line) break 2;
+		if ($line === $marker) break;
+		$buffer .= $line . "\n";
+	}
+
+    // execute it
+	try{
+		$json = json_encode([eval($buffer),""]);
+	}catch(Throwable $t){
+		$json = json_encode([null,(string)$t]);
+	}
+	if($json===false) {
+		$json = '[null,"Error encoding result"]';
+	}
+
+    // and write out the result
+	ob_end_clean();
+	fwrite(STDOUT,"$json\n");
+    ob_start(null,0,PHP_OUTPUT_HANDLER_CLEANABLE);
+}