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# FS (filesystem) module
This module provides functions to inspect the file system. It is
available starting with version 0.53.0.
## File lookup rules
Non-absolute paths are looked up relative to the directory where the
current `meson.build` file is.
If specified, `~` is expanded to the user home directory.
### exists
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.
### is_dir
Takes a single string argument and returns true if a directory with
that name exists on the file system. This method follows symbolic
links.
### is_file
Takes a single string argument and returns true if an file with that
name exists on the file system. This method follows symbolic links.
### is_symlink
Takes a single string argument and returns true if the path pointed to
by the string is a symbolic link.
## Filename modification
### with_suffix
The `with_suffix` method is a *string manipulation* convenient for filename modifications.
It allows changing the filename suffix like:
## swap suffix
```meson
original = '/opt/foo.ini'
new = fs.with_suffix('.txt') # /opt/foo.txt
```
#### add suffix
```meson
original = '/opt/foo'
new = fs.with_suffix('.txt') # /opt/foo.txt
```
#### compound suffix swap
```meson
original = '/opt/foo.dll.a'
new = fs.with_suffix('.so') # /opt/foo.dll.so
```
#### delete suffix
```meson
original = '/opt/foo.dll.a'
new = fs.with_suffix('') # /opt/foo.dll
```
The files need not actually exist yet for this method, as it's just string manipulation.
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