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+//! The `wolfree_sed_in_place` crate provides a function for performing in-place replacements of patterns in multiple files using regular expressions.
+//! It allows you to recursively process all files within a specified directory and replace occurrences of a given pattern with a specified replacement string.
+
+#![allow(clippy::blanket_clippy_restriction_lints)]
+#![allow(clippy::exit)]
+#![allow(clippy::print_stderr)]
+#![allow(clippy::implicit_return)]
+
+/* SPDX-License-Identifier: AGPL-3.0-or-later
+ * This file is part of Wolfree.
+ * 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.
+ */
+
+use regex::Regex;
+use std::fs;
+use walkdir::WalkDir;
+
+/// Perform in-place replacements on files in a given directory, using regular expressions.
+///
+/// This function walks through all the files in the specified `directory_path`,
+/// filters out directories, and applies a regular expression-based replacement
+/// on the contents of each file.
+///
+/// # Arguments
+///
+/// * `directory_path`: A string slice representing the path of the directory to traverse.
+/// * `pattern`: A string slice containing the regular expression pattern to search for.
+/// * `replacement`: A string slice representing the replacement for each matched pattern.
+///
+/// # Examples
+///
+/// ```rust
+/// // Replace a specific pattern in the file contents in the "./data/" directory.
+/// wolfree_sed_in_place("./data/", r"\bFoo\b", "Bar");
+/// ```
+///
+/// This example replaces all occurrences of the word "Foo" with "Bar" in the files inside the "data" directory.
+fn wolfree_sed_in_place(directory_path: &str, pattern: &str, replacement: &str) {
+    // Compile the regular expression pattern
+    let regex = match Regex::new(pattern) {
+        Ok(re) => re,
+        Err(err) => {
+            eprintln!("Error: {err}",);
+            std::process::exit(1);
+        }
+    };
+
+    // Create a directory walker and filter out non-file entries
+    let walker = WalkDir::new(directory_path)
+        .into_iter()
+        .filter_map(Result::ok)
+        .filter(|entry| !entry.file_type().is_dir());
+
+    // Process each file in the directory
+    for entry in walker {
+        let file_path = entry.path();
+
+        // Read the file's contents into a string
+        let file_contents = match fs::read_to_string(file_path) {
+            Ok(contents) => contents,
+            Err(err) => {
+                eprintln!("Error: {err}",);
+                std::process::exit(1);
+            }
+        };
+
+        // Perform the regex replacement on the file's contents
+        let modified_contents = regex.replace(&file_contents, replacement);
+        let modified_contents_as_ref = modified_contents.as_ref();
+
+        // Write the modified contents back to the file, overwriting its previous contents
+        match fs::write(file_path, modified_contents_as_ref) {
+            Ok(_) => (),
+            Err(err) => {
+                eprintln!("Error: {err}",);
+                std::process::exit(1);
+            }
+        };
+    }
+}
+
+/// Entry point of the program.
+/// Demonstrates using `wolfree_sed_in_place` function to perform in-place replacements on files in specific directories.
+fn main() {
+    wolfree_sed_in_place(
+        "./docusaurus/build/input/",
+        "</head><body>",
+        include_str!("include_str.html"),
+    );
+
+    wolfree_sed_in_place(
+        "./docusaurus/build/_next/static/chunks/",
+        r"try(.{0,100}?)generateEncodedJSONFromValue(.*?)unescapeForUrl(.*?)catch(.*?)\{}",
+        include_str!("include_str.tsx"),
+    );
+
+    // console error:
+    //     _app-daabd76ef4fe402d.js:5
+    //     WebSocket connection to 'wss://localhost/n/v1/api/fetcher/results' failed:
+    //     startWebsocket @ _app-daabd76ef4fe402d.js:5
+    //     send           @ _app-daabd76ef4fe402d.js:5
+    //     sendMessage    @ 1695-ae743311a23f8eb5.js:1
+    //     newQuery       @ 1695-ae743311a23f8eb5.js:78
+    //     newQuery       @ 1695-ae743311a23f8eb5.js:78
+    // fix:
+    //     Override the hostname in the minified JavaScript source code.
+    wolfree_sed_in_place(
+        "./docusaurus/build/_next/static/chunks/pages/",
+        "window.location.hostname",
+        "'www.wolframalpha.com'",
+    );
+}
+
+// regex101: build, test, and debug regex
+// https://regex101.com/