# Module Filename

    module Filename: sig .. end

Operations on file names.

    val current_dir_name : string

The conventional name for the current directory (e.g. `.` in Unix).

    val parent_dir_name : string

The conventional name for the parent of the current directory (e.g. `..` in Unix).

    val concat : string -> string -> string

`concat dir file` returns a file name that designates file `file` in directory `dir`.

    val is_relative : string -> bool

Return `true` if the file name is relative to the current directory, `false` if it is absolute (i.e. in Unix, starts with `/`).

    val is_implicit : string -> bool

Return `true` if the file name is relative and does not start with an explicit reference to the current directory (`./` or `../` in Unix), `false` if it starts with an explicit reference to the root directory or the current directory.

    val check_suffix : string -> string -> bool

`check_suffix name suff` returns `true` if the filename `name` ends with the suffix `suff`.

    val chop_suffix : string -> string -> string

`chop_suffix name suff` removes the suffix `suff` from the filename `name`. The behavior is undefined if `name` does not end with the suffix `suff`.

    val chop_extension : string -> string

Return the given file name without its extension. The extension is the shortest suffix starting with a period and not including a directory separator, `.xyz` for instance.

Raise `Invalid_argument` if the given name does not contain an extension.

    val basename : string -> string

Split a file name into directory name / base file name. `concat (dirname name) (basename name)` returns a file name which is equivalent to `name`. Moreover, after setting the current directory to `dirname name` (with `Sys.chdir`), references to `basename name` (which is a relative file name) designate the same file as `name` before the call to `Sys.chdir`.

The result is not specified if the argument is not a valid file name (for example, under Unix if there is a NUL character in the string).

    val dirname : string -> string

See `Filename.basename`.

    val temp_file : string -> string -> string

`temp_file prefix suffix` returns the name of a fresh temporary file in the temporary directory. The base name of the temporary file is formed by concatenating `prefix`, then a suitably chosen integer number, then `suffix`. The temporary file is created empty, with permissions `0o600` (readable and writable only by the file owner). The file is guaranteed to be different from any other file that existed when `temp_file` was called. Under Unix, the temporary directory is `/tmp` by default; if set, the value of the environment variable `TMPDIR` is used instead. Under Windows, the name of the temporary directory is the value of the environment variable `TEMP`, or `C:\temp` by default.

    val open_temp_file : ?mode:open_flag list ->
           string -> string -> string * out_channel

Same as `Filename.temp_file`, but returns both the name of a fresh temporary file, and an output channel opened (atomically) on this file. This function is more secure than `temp_file`: there is no risk that the temporary file will be modified (e.g. replaced by a symbolic link) before the program opens it. The optional argument `mode` is a list of additional flags to control the opening of the file. It can contain one or several of `Open_append`, `Open_binary`, and `Open_text`. The default is `[Open_text]` (open in text mode).

    val quote : string -> string

Return a quoted version of a file name, suitable for use as one argument in a shell command line, escaping all shell meta-characters.