feat: add fs/append-file

lib/node_modules/@stdlib/fs/append-file/README.md

@@ -0,0 +1,239 @@
+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2024 The Stdlib Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+-->
+
+# Append File
+
+> Append data to a file.
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var appendFile = require( '@stdlib/fs/append-file' );
+```
+
+#### appendFile( file, data\[, options], clbk )
+
+Asynchronously appends `data` to a `file`.
+
+```javascript
+var join = require( 'path' ).join;
+
+var fpath = join( __dirname, 'examples', 'fixtures', 'file.txt' );
+
+appendFile( fpath, 'beep boop\n', onAppend );
+
+function onAppend( error ) {
+    if ( error ) {
+        console.log( error instanceof Error );
+        // => false
+    }
+}
+```
+
+The `data` argument may be either a `string` or a [`Buffer`][@stdlib/buffer/ctor].
+
+```javascript
+var join = require( 'path' ).join;
+var string2buffer = require( '@stdlib/buffer/from-string' );
+
+var fpath = join( __dirname, 'examples', 'fixtures', 'file.txt' );
+
+appendFile( fpath, string2buffer( 'beep boop\n' ), onAppend );
+
+function onAppend( error ) {
+    if ( error ) {
+        console.log( error instanceof Error );
+        // => false
+    }
+}
+```
+
+The function accepts the same `options` and has the same defaults as [`fs.appendFile()`][node-fs].
+
+#### appendFile.sync( file, data\[, options] )
+
+Synchronously appends `data` to a `file`.
+
+```javascript
+var join = require( 'path' ).join;
+
+var fpath = join( __dirname, 'examples', 'fixtures', 'file.txt' );
+
+var err = appendFile.sync( fpath, 'beep boop\n' );
+if ( err instanceof Error ) {
+    throw err;
+}
+```
+
+The function accepts the same `options` and has the same defaults as [`fs.appendFileSync()`][node-fs].
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+## Notes
+
+-   The difference between this `appendFile.sync` and [`fs.appendFileSync()`][node-fs] is that [`fs.appendFileSync()`][node-fs] will throw if an `error` is encountered (e.g., if given a non-existent directory path) and this API will return an `error`. Hence, the following anti-pattern
+
+    <!-- eslint-disable node/no-sync -->
+
+    ```javascript
+    var fs = require( 'fs' );
+
+    // Check for directory path existence to prevent an error being thrown...
+    if ( fs.existsSync( '/path/to' ) ) {
+        fs.appendFileSync( '/path/to/file.txt', 'beep boop\n' );
+    }
+    ```
+
+    can be replaced by an approach which addresses existence via `error` handling.
+
+    <!-- eslint-disable node/no-sync -->
+
+    ```javascript
+    var appendFile = require( '@stdlib/fs/append-file' );
+
+    // Explicitly handle the error...
+    var err = appendFile.sync( '/path/to/file.txt', 'boop beep\n' );
+    if ( err instanceof Error ) {
+        // You choose what to do...
+        throw err;
+    }
+    ```
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+## Examples
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var join = require( 'path' ).join;
+var appendFile = require( '@stdlib/fs/append-file' );
+
+var fpath = join( __dirname, 'examples', 'fixtures', 'file.txt' );
+
+// Synchronously append data to a file:
+
+var error = appendFile.sync( fpath, 'beep boop\n', 'utf8' );
+// Function successfully executes and returns null
+
+console.log( error instanceof Error );
+// => false
+
+// Asynchronously append data to a file:
+
+appendFile( fpath, 'beep boop\n', onAppend );
+
+function onAppend( error ) {
+    if ( error ) {
+        console.error( 'Error: %s', error.message );
+    }
+    console.log( 'Success!!!' );
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+* * *
+
+<section class="cli">
+
+## CLI
+
+<section class="usage">
+
+### Usage
+
+```text
+Usage: append-file [options] <filepath>
+
+Options:
+
+  -h,    --help                Print this message.
+  -V,    --version             Print the package version.
+  --enc, --encoding encoding   Encoding. Default: 'utf8'.
+         --flag flag           Flag. Default: 'a'.
+         --mode mode           Mode. Default: 0o666.
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="notes">
+
+### Notes
+
+-   Relative output file paths are resolved relative to the current working directory.
+-   Errors are written to `stderr`.
+-   File contents should be provided over `stdin` as part of a [standard stream][standard-stream] pipeline.
+
+</section>
+
+<!-- /.notes -->
+
+<section class="examples">
+
+### Examples
+
+```bash
+$ printf 'beep boop\n' | append-file ./examples/fixtures/file.txt
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.cli -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[node-fs]: https://nodejs.org/api/fs.html
+
+[@stdlib/buffer/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/buffer/ctor
+
+[standard-stream]: https://en.wikipedia.org/wiki/Pipeline_%28Unix%29
+
+</section>
+
+<!-- /.links -->

lib/node_modules/@stdlib/fs/append-file/benchmark/benchmark.js

@@ -0,0 +1,83 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var join = require( 'path' ).join;
+var bench = require( '@stdlib/bench' );
+var unlink = require( '@stdlib/fs/unlink' ).sync;
+var pkg = require( './../package.json' ).name;
+var appendFile = require( './../lib' );
+
+
+// FIXTURES //
+
+var TMP = join( __dirname, 'fixtures', 'temp.txt' );
+var DATA = 'boop beep\n';
+
+
+// MAIN //
+
+bench( pkg, function benchmark( b ) {
+	var i;
+
+	i = 0;
+	b.tic();
+
+	return next();
+
+	function next() {
+		i += 1;
+		if ( i <= b.iterations ) {
+			return appendFile( TMP, DATA, done );
+		}
+		b.toc();
+		unlink( TMP );
+		b.pass( 'benchmark finished' );
+		b.end();
+	}
+
+	function done( error ) {
+		if ( error ) {
+			b.fail( error.message );
+		}
+		next();
+	}
+});
+
+bench( pkg+':sync', function benchmark( b ) {
+	var out;
+	var i;
+
+	b.tic();
+	for (i = 0; i < b.iterations; i++) {
+		out = appendFile.sync( TMP, DATA );
+		if ( out instanceof Error ) {
+			b.fail( out.message );
+		}
+	}
+	b.toc();
+	unlink( TMP );
+	if ( out instanceof Error ) {
+		b.fail( out.message );
+	}
+	b.pass( 'benchmark finished' );
+	b.end();
+});