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<h1 id="fs-filesystem-module">FS (filesystem) module</h1>
<p>This module provides functions to inspect the file system. It is
available starting with version 0.53.0.</p>
<p>Since 0.59.0, all functions accept <code>files()</code> objects if they can do something
useful with them (this excludes <code>exists</code>, <code>is_dir</code>, <code>is_file</code>, <code>is_absolute</code>
since a <code>files()</code> object is always the absolute path to an existing file).</p>
<h2 id="usage">Usage</h2>
<p>The module may be imported as follows:</p>
<pre><code class="language-meson">fs = <a href="Reference-manual_functions.html#import"><ins>import</ins></a>('fs')
</code></pre>
<h2 id="file-lookup-rules">File lookup rules</h2>
<p>Non-absolute paths are looked up relative to the directory where the
current <code>meson.build</code> file is.</p>
<p>If specified, a leading <code>~</code> is expanded to the user home directory.
Environment variables are not available as is the rule throughout Meson.
That is, $HOME, %USERPROFILE%, $MKLROOT, etc. have no meaning to the Meson
filesystem module. If needed, pass such variables into Meson via command
line options in <code>meson.options</code>, native-file or cross-file.</p>
<p>Where possible, symlinks and parent directory notation are resolved to an
absolute path.</p>
<h3 id="exists">exists</h3>
<p>Takes a single string argument and returns true if an entity with that
name exists on the file system. This can be a file, directory or a
special entry such as a device node.</p>
<h3 id="is_dir">is_dir</h3>
<p>Takes a single string argument and returns true if a directory with
that name exists on the file system.</p>
<h3 id="is_file">is_file</h3>
<p>Takes a single string argument and returns true if an file with that
name exists on the file system.</p>
<h3 id="is_symlink">is_symlink</h3>
<p>Takes a single string or (since 0.59.0) <code>files()</code> argument and returns true if
the path pointed to by the string is a symbolic link.</p>
<h2 id="file-parameters">File Parameters</h2>
<h3 id="is_absolute">is_absolute</h3>
<p><em>since 0.54.0</em></p>
<p>Return a boolean indicating if the path string or (since 0.59.0) <code>files()</code>
specified is absolute, WITHOUT expanding <code>~</code>.</p>
<p>Examples:</p>
<pre><code class="language-meson">fs.is_absolute('~') # false
home = fs.expanduser('~')
fs.is_absolute(home) # true
fs.is_absolute(home / 'foo') # true, even if ~/foo doesn't exist
fs.is_absolute('foo/bar') # false, even if ./foo/bar exists
</code></pre>
<h3 id="hash">hash</h3>
<p>The <code>fs.hash(filename, hash_algorithm)</code> method returns a string containing
the hexadecimal <code>hash_algorithm</code> digest of a file.
<code>hash_algorithm</code> is a string; the available hash algorithms include:
md5, sha1, sha224, sha256, sha384, sha512.</p>
<h3 id="size">size</h3>
<p>The <code>fs.size(filename)</code> method returns the size of the file in integer bytes.</p>
<h3 id="is_samepath">is_samepath</h3>
<p>The <code>fs.is_samepath(path1, path2)</code> returns boolean <code>true</code> if both
paths resolve to the same path. For example, suppose path1 is a
symlink and path2 is a relative path. If <code>path1</code> can be resolved to
<code>path2</code>, then <code>true</code> is returned. If <code>path1</code> is not resolved to
<code>path2</code>, <code>false</code> is returned. If <code>path1</code> or <code>path2</code> do not exist,
<code>false</code> is returned.</p>
<p>Examples:</p>
<pre><code class="language-meson">x = 'foo.txt'
y = 'sub/../foo.txt'
z = 'bar.txt' # a symlink pointing to foo.txt
j = 'notafile.txt' # nonexistent file
fs.is_samepath(x, y) # true
fs.is_samepath(x, z) # true
fs.is_samepath(x, j) # false
p = 'foo/bar'
q = 'foo/bar/baz/..'
r = 'buz' # a symlink pointing to foo/bar
s = 'notapath' # nonexistent directory
fs.is_samepath(p, q) # true
fs.is_samepath(p, r) # true
fs.is_samepath(p, s) # false
</code></pre>
<h2 id="filename-modification">Filename modification</h2>
<p>The files need not actually exist yet for these path string
manipulation methods.</p>
<h3 id="expanduser">expanduser</h3>
<p><em>since 0.54.0</em></p>
<p>A path string with a leading <code>~</code> is expanded to the user home
directory</p>
<p>Examples:</p>
<pre><code class="language-meson">fs.expanduser('~') # user home directory
fs.expanduser('~/foo') # <homedir>/foo
</code></pre>
<h3 id="as_posix">as_posix</h3>
<p><em>since 0.54.0</em></p>
<p><code>fs.as_posix(path)</code> assumes a Windows path, even if on a Unix-like
system. Thus, all <code>'\'</code> or <code>'\\'</code> are turned to '/', even if you meant
to escape a character.</p>
<p>Examples</p>
<pre><code class="language-meson">fs.as_posix('\\') == '/' # true
fs.as_posix('\\\\') == '/' # true
fs.as_posix('foo\\bar/baz') == 'foo/bar/baz' # true
</code></pre>
<h3 id="replace_suffix">replace_suffix</h3>
<p>The <code>replace_suffix</code> method is a <em>string manipulation</em> convenient for
filename modifications. It allows changing the filename suffix like:</p>
<h4 id="swap-suffix">swap suffix</h4>
<pre><code class="language-meson">original = '/opt/foo.ini'
new = fs.replace_suffix(original, '.txt') # /opt/foo.txt
</code></pre>
<h4 id="add-suffix">add suffix</h4>
<pre><code class="language-meson">original = '/opt/foo'
new = fs.replace_suffix(original, '.txt') # /opt/foo.txt
</code></pre>
<h4 id="compound-suffix-swap">compound suffix swap</h4>
<pre><code class="language-meson">original = '/opt/foo.dll.a'
new = fs.replace_suffix(original, '.so') # /opt/foo.dll.so
</code></pre>
<h4 id="delete-suffix">delete suffix</h4>
<pre><code class="language-meson">original = '/opt/foo.dll.a'
new = fs.replace_suffix(original, '') # /opt/foo.dll
</code></pre>
<h3 id="parent">parent</h3>
<p>Returns the parent directory (i.e. dirname).</p>
<pre><code class="language-meson">new = fs.parent('foo/bar') # foo
new = fs.parent('foo/bar/baz.dll') # foo/bar
</code></pre>
<h3 id="name">name</h3>
<p>Returns the last component of the path (i.e. basename).</p>
<pre><code class="language-meson">fs.name('foo/bar/baz.dll.a') # baz.dll.a
</code></pre>
<h3 id="stem">stem</h3>
<p><em>since 0.54.0</em></p>
<p>Returns the last component of the path, dropping the last part of the
suffix</p>
<pre><code class="language-meson">fs.stem('foo/bar/baz.dll') # baz
fs.stem('foo/bar/baz.dll.a') # baz.dll
</code></pre>
<h3 id="read">read</h3>
<ul>
<li>
<code>read(path, encoding: 'utf-8')</code> <em>(since 0.57.0)</em>:
return a <a href="Syntax.html#strings">string</a> with the contents of the given <code>path</code>.
If the <code>encoding</code> keyword argument is not specified, the file specified by
<code>path</code> is assumed to be utf-8 encoded. Binary files are not supported. The
provided paths should be relative to the current <code>meson.current_source_dir()</code>
or an absolute path outside the build directory is accepted. If the file
specified by <code>path</code> changes, this will trigger Meson to reconfigure the
project. If the file specified by <code>path</code> is a <code>files()</code> object it
cannot refer to a built file.</li>
</ul>
<h3 id="relative_to">relative_to</h3>
<p><em>Since 1.3.0</em></p>
<p>Return a relative filepath. In the event a relative path could not be found, the
absolute path of <code>to</code> is returned. Relative path arguments will be assumed to be
relative to <code>meson.current_source_dir()</code>.</p>
<p>Has the following positional arguments:</p>
<ul>
<li>to <code>str | file | custom_tgt | custom_idx | build_tgt</code>: end path</li>
<li>from <code>str | file | custom_tgt | custom_idx | build_tgt</code>: start path</li>
</ul>
<p>returns:</p>
<ul>
<li>a string</li>
</ul>
<h3 id="copyfile">copyfile</h3>
<p><em>Since 0.64.0</em></p>
<p>Copy a file from the source directory to the build directory at build time</p>
<p>Has the following positional arguments:</p>
<ul>
<li>src <code>File | str</code>: the file to copy</li>
</ul>
<p>Has the following optional arguments:</p>
<ul>
<li>dest <code>str</code>: the name of the output file. If unset will be the basename of
the src argument</li>
</ul>
<p>Has the following keyword arguments:</p>
<ul>
<li>install <code>bool</code>: Whether to install the copied file, defaults to false</li>
<li>install_dir <code>str</code>: Where to install the file to</li>
<li>install_tag: <code>str</code>: the install tag to assign to this target</li>
<li>install_mode <code>array[str | int]</code>: the mode to install the file with</li>
</ul>
<p>returns:</p>
<ul>
<li>a <a href="Reference-manual_functions.html#custom_target"><ins><code>custom_target()</code></ins></a> object</li>
</ul>
<pre><code class="language-meson">copy = fs.copyfile('input-file', 'output-file')
</code></pre>
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