[SOLVED] [Ruby FileMagic] Checks on ARGF (STDIN)

Michael Uplawski · 07-04-2024, 02:11 AM

Good morning

I must verify Mime-types and/or the Magic of data which is read via STDIN (ARGF in Ruby ... and others) (I presume)

The only thing that I can currently come up with, this morning, under pressure of time, is a temporary file.

So basically, I *can* do what I want. But I find it clumsy and ugly.
AFAIS the obstruction comes from the limited functionality of the FileMagic gem, but I may be erring (StreamMagic or STDINMagic is what I seek, I guess).

Would anybody have a better idea? Do as if I was starting to program and this were my very first project, ever. “Wrong project!” would be a pertinent answer, but let us exclude this for now. TY.

TY.

NevemTeve · 07-04-2024, 03:27 AM

Guess you mean you wish to use `libmagic` or `file` utility in your program.

shruggy · 07-04-2024, 04:16 AM

There are four Ruby gems (listed here in the order of their popularity):

ruby-magic (last updated in 2023),
ruby-filemagic (last updated in 2022),
magic (last updated in 2015), and
filemagic (last updated in 2016).

Which one do you use?

E.g. using ruby-filemagic

Code:

$ ruby -rfilemagic -e 'puts FileMagic.mime.file $<.filename' README.md
text/plain; charset=utf-8

Code:

$ ruby -rfilemagic -e 'puts FileMagic.mime.buffer $<.read' <README.md
text/plain; charset=utf-8

The same using magic

Code:

$ ruby -rmagic -e 'puts Magic.guess_file_mime $<.filename' README.md
text/plain; charset=utf-8

Code:

$ ruby -rmagic -e 'puts Magic.guess_string_mime $<.read' <README.md
text/plain; charset=utf-8

The same using ruby-magic

Code:

$ ruby -rmagic/magic -rmagic -e'puts File.mime$<.filename' README.md
text/plain; charset=utf-8

Code:

$ ruby -rmagic/magic -rmagic -e'puts$<.read.mime' <README.md
text/plain; charset=utf-8

Michael Uplawski · 07-04-2024, 04:09 PM

I am using ruby-filemagic.
It looks as if I have not understood ARGF.filename, nor ARGF.read.
TY.

Michael Uplawski · 07-05-2024, 04:17 PM

Good evening

FileMagic.mime.buffer is not documented, it seems.
But I am using it now.

shruggy · 07-06-2024, 06:26 AM

It is a shortcut for FileMagic.open(:mime).buffer as described here.

Michael Uplawski · 07-07-2024, 02:28 PM

Maybe I am able to understand Ruby and some Modules, but unable to cope with the documentation.