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39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
# Is This A Directory Or A File?
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When compiling [ReasonML](https://reasonml.github.io/) natively, we have access to a variety of
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additional modules including the `Unix` module. We can interact with
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directories and files using functions on `Unix`.
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```reason
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let current_dir = Unix.opendir(Unix.getcwd());
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let first_file = Unix.readdir(current_dir);
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/* is first_file a directory or a file? */
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Unix.closedir(current_dir);
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```
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Here we open the current working directory, grab the first thing out of that
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directory -- maybe it's a file, maybe it's a directory, maybe it is
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something else. Lastly, we close the directory.
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```reason
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let current_dir = Unix.opendir(Unix.getcwd());
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let first_file = Unix.readdir(current_dir);
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switch(Unix.stat(first_file)) {
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| Unix.stats({ st_kind: Unix.S_REG }) => print_endline("Regular File")
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| Unix.stats({ st_kind: Unix.S_DIR }) => print_endline("Directory")
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| Unix.stats({ st_kind: Unix.S_LINK }) => print_endline("Link")
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| Unix.stats({ st_kind: Unix.S_SOCK }) => print_endline("Socket")
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| _ => print_endline("Something else")
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};
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Unix.closedir(current_dir);
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```
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There are a variety of kinds of files to switch on. Here, we are switching
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on _Regular Files_, _Directories_, _Links_, and _Sockets_. Everything else
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falls through.
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See the [`Unix` module docs](https://reasonml.github.io/api/Unix.html) for
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more details.
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