Add file modification history update script (#121)

* Add file modification history update script

* Make documentation and history file paths command line arguments

---------

Co-authored-by: haszi <haszika80@gmail.com>

scripts/updateModHistory.php

@@ -0,0 +1,219 @@
+<?php
+
+$commandLineOptions = getopt("", ["docs-path:", "history-path::"]);
+
+verifyCommandLineOptions($commandLineOptions);
+
+$documentationPath = realpath($commandLineOptions["docs-path"]);
+$modHistoryFile = realpath($commandLineOptions["history-path"]);
+
+$runningInGithubActions = (getenv("GITHUB_ACTIONS") !== false);
+
+$head = $runningInGithubActions ? "\$GITHUB_SHA" : "HEAD";
+
+$modHistoryArray = [];
+if (file_exists($modHistoryFile)) {
+    echo timeStamp() . " - Loading modification history file... ";
+    $modHistoryArray = include $modHistoryFile;
+    if (!is_array($modHistoryArray)) {
+		echo "file is corrupted (not an array)\n";
+        exit(1);
+    }
+    echo "done\n";
+} else {
+    echo timeStamp() . " - Modification history file doesn't exist\n";
+}
+
+echo timeStamp() . " - Switching to documentation directory... ";
+chdir($documentationPath);
+echo "done\n";
+
+if (isset($modHistoryArray["last commit hash"]) && $modHistoryArray["last commit hash"] !== "") {
+    echo timeStamp() . " - Found last commit hash: " . $modHistoryArray["last commit hash"] . "\n";
+    echo timeStamp() . " - Retrieving hash of the common ancestor of HEAD and the last commit... ";
+    $cmd = "git merge-base " . $modHistoryArray["last commit hash"] . " $head";
+    if (exec($cmd, $commonAncestor, $exitCode) === false
+        || $exitCode > 0) {
+		echo "failed\n";
+        exit(1);
+    }
+    $commonAncestorHash = implode("", $commonAncestor);
+    echo "done: ";
+} else {
+    echo timeStamp() . " - Last commit hash not found. Using empty git tree hash: ";
+    // since there is no modification history, generate it for all commits since the inital one
+    // 4b825dc642cb6eb9a060e54bf8d69288fbee4904 is the SHA1 of the empty git tree
+    $commonAncestorHash = "4b825dc642cb6eb9a060e54bf8d69288fbee4904";
+}
+echo $commonAncestorHash . "\n";
+
+echo timeStamp() . " - Retrieving number of files with a diff... ";
+$cmd = "git diff --name-only $commonAncestorHash $head | wc -l";
+if (exec($cmd, $numOfFilesWithDiff, $exitCode) === false
+    || $exitCode > 0) {
+    echo "failed\n";
+    exit(1);
+}
+$numOfFilesWithDiff = implode("", $numOfFilesWithDiff);
+echo "done (" . $numOfFilesWithDiff . ")\n";
+
+if ($numOfFilesWithDiff === "0") {
+    echo timeStamp() . " - No changes since last commit. Exiting...\n";
+    exit(0);
+}
+
+$modifiedFilescommand = <<<COMMAND
+#!/usr/bin/env bash
+echo "last commit hash:"
+echo "$(git rev-parse $head)"
+git diff --name-only $commonAncestorHash $head | while read -r filename; do
+  echo "filename:"
+  echo "\$filename"
+  echo "modified:"
+  echo "$(git log -1 --format='%aI' -- \$filename)"
+  echo "contributors:"
+  git log --format='%an' -- \$filename|awk '!a[$0]++'
+done
+COMMAND;
+
+echo timeStamp() . " - Retrieving commit authors and last commit date/time of modified files... \n";
+
+$modifiedFiles = [];
+
+$proc = popen($modifiedFilescommand, 'rb');
+while (($line = fgets($proc)) !== false) {
+    processGitDiffLine(rtrim($line, "\n\r"), $modifiedFiles);
+    if (! $runningInGithubActions) {
+        $fileCounter = max(count($modifiedFiles) - 1, 0);
+        fwrite(
+            STDERR,
+            sprintf("\033[0G{$fileCounter} of {$numOfFilesWithDiff} files read...", "", "")
+        );
+    }
+}
+pclose($proc);
+
+echo " done\n";
+
+$s = ($modifiedFiles > 2) ? "s" : "";
+echo timeStamp() . " - Retrieved author$s and last commit date$s/time$s for " . (count($modifiedFiles) - 1) . " file$s\n";
+if (count($modifiedFiles) === 1) {
+    // there will always be at least 1 entry with the last commit hash
+    exit(1);
+}
+
+$mergedModHistory = array_merge($modHistoryArray, $modifiedFiles);
+
+echo timeStamp() . " - Writing modification history file... ";
+
+$fp = fopen($modHistoryFile, "w");
+fwrite($fp, "<?php\n\n/* This is a generated file */\n\nreturn [\n");
+foreach ($mergedModHistory as $fileName => $fileProps) {
+    if ($fileName === "last commit hash") {
+        fwrite($fp, "    \"last commit hash\" => \"" . implode("", $fileProps) . "\",\n");
+        continue;
+    }
+    $newModHistoryString = '    "' . $fileName . "\" => [\n";
+    $newModHistoryString .= "        \"modified\" => \"" . ($fileProps["modified"] ?? "") . "\",\n";
+    $newModHistoryString .= "        \"contributors\" => [\n";
+    if (isset($fileProps["contributors"])) {
+        if (!is_array($fileProps["contributors"])) {
+            exit("Non-array contributors list\n");
+        }
+        foreach ($fileProps["contributors"] as $contributor) {
+            $newModHistoryString .= "            \"" . $contributor . "\",\n";
+        }
+    }
+    $newModHistoryString .= "        ],\n";
+    $newModHistoryString .= "    ],\n";
+    fwrite($fp, $newModHistoryString);
+}
+fwrite($fp, "];\n");
+fclose($fp);
+
+echo "done at " . date('H:i:s') . "\n";
+
+function timeStamp(): string {
+    return "[" . date('H:i:s') . "]";
+}
+
+function processGitDiffLine($line, &$modifiedFiles): void {
+    static $currentType = "";
+    static $currentFile = "";
+
+    switch ($line) {
+        case "filename:":
+            $currentType = "filename";
+            return;
+        case "modified:":
+            $currentType = "modDateTime";
+            return;
+        case "contributors:":
+            $currentType = "contributors";
+            return;
+        case "last commit hash:":
+            $currentType = "commitHash";
+            return;
+    }
+    if ($currentType === "") {
+        return;
+    }
+
+    switch ($currentType) {
+        case "filename":
+            $currentFile = $line;
+            break;
+        case "modDateTime":
+            if ($currentFile === "") {
+                return;
+            }
+            $modifiedFiles[$currentFile]["modified"] = $line;
+            break;
+        case "contributors":
+            if ($currentFile === "") {
+                return;
+            }
+            $modifiedFiles[$currentFile]["contributors"][] = htmlspecialchars($line, ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401);
+            break;
+        case "commitHash":
+            $modifiedFiles["last commit hash"][] = $line;
+            break;
+    }
+}
+
+function verifyCommandLineOptions($commandLineOptions): void {
+    $output = timeStamp() . " - Parsing command line arguments... ";
+    echo $output;
+    if ($commandLineOptions === false
+        || !isset($commandLineOptions["docs-path"])) {
+        echo "\"--docs-path\" is a required argument\n";
+        exit(1);
+    }
+    echo "documentation path supplied\n";
+    if (isset($commandLineOptions["history-path"])) {
+        printf("%*smod history file path supplied\n", strlen($output), " ");
+    }
+
+    $output = timeStamp() . " - Verifying command line arguments... ";
+    echo $output;
+    if (!file_exists($commandLineOptions["docs-path"])) {
+        echo "documentation path \"" . $commandLineOptions["docs-path"] . "\" doesn't exist\n";
+        exit(1);
+    } else if (!is_dir($commandLineOptions["docs-path"])) {
+        echo "documentation path \"" . $commandLineOptions["docs-path"] . "\" is not a directory\n";
+        exit(1);
+    }
+    echo "documentation path verified\n";
+
+    if (isset($commandLineOptions["history-path"])) {
+        printf("\n%*smod history file path ", strlen($output), " ");
+        if (!file_exists($commandLineOptions["history-path"])) {
+            echo "\"" . $commandLineOptions["history-path"] . "\" doesn't exist\n";
+            exit(1);
+        } else if (!is_file($commandLineOptions["history-path"])) {
+            echo "\"" . $commandLineOptions["history-path"] . "\" is not a file\n";
+            exit(1);
+        }
+        echo "verified\n";
+    }
+}