List non-empty files in a folder

[Charles Novaes de Santana]

Hi julians,

I am using readdir() and filter!() to list files in a folder that match a given pattern (lets' say, to list all .txt files).

Now I would like to filter the files according to their sizes. I only want to list non-empty files within a folder, so my first shot is to list files which sizes are higher than zero bytes.

Some days ago there was a thread about listing the last modified file, that used map() and mtime(). Do you know something similar to list files by size?

Thanks for any tip!

Best,

Charles

--

Um axé! :)

--
Charles Novaes de Santana, PhD
http://www.imedea.uib-csic.es/~charles

[Yichao Yu]

stat[1] should have the info you need to write your own filter.

[1] http://julia.readthedocs.org/en/latest/stdlib/file/?highlight=stat#Base.stat

[Charles Novaes de Santana]

Just to give a code to work. My code now is:

folder=".";
files = filter!(r"\.txt$",readdir(folder));

Thanks!

Charles

[Charles Novaes de Santana]

Thanks! stat is great!! :)

My R-biased programming can solve the problem by using the following code:

minsize=100
folder=".";
files = filter!(r"\.txt$",readdir(folder))[map(filesize,filter!(r"\.txt$",readdir(folder))).>minsize]

It solves my problem. But I would appreciate if anyone has any other suggestion to do it in a Julia-style :)

Thanks a lot!

Best,

Charles

[Yichao Yu]

On Thu, Oct 29, 2015 at 11:41 AM, Charles Novaes de Santana
<charles...@gmail.com> wrote:
> Thanks! stat is great!! :)
>
> My R-biased programming can solve the problem by using the following code:
>
> minsize=100
> folder=".";
> files =
> filter!(r"\.txt$",readdir(folder))[map(filesize,filter!(r"\.txt$",readdir(folder))).>minsize]

I don't think `readdir` necessarily garentee returning the files in
the same order every time you call it on all platforms. The simplest
improvement is just to call filter twice but you could also just do

```
filter!(fname->(endswith(fname, ".txt") && filesize(fname) > minsize),
readdir(folder))
```

Note that you don't need a regular expression for endswith...

[Stefan Karpinski]

You can also use do-block syntax to make it a little easer to read:

files = filter!(readdir(folder)) do fname

    splitext(fname)[2] == "txt" && filesize(fname) >= minsize

end

Using the splitext function avoids the somewhat unlikely corner case of having a hidden file whose entire name is ".txt" which should probably not be considered to have the extension ".txt" even though it does technically end with that string.

[Charles Novaes de Santana]

Thank you both! :) These different ways of doing the same thing in Julia are quite useful (and funny! :))

Best,

Charles