From: ara.t.howard@...
Date: 2006-12-10T05:06:08+09:00
Subject: Re: File.yaml?(fname)

On Sun, 10 Dec 2006, Trans wrote:

> what's the best way to determine if a file is yaml?
>
> thanks,
> t.

in ruby queue i detect whether stdin input is a normal list or yaml in this
way:

   if first_non_blank_line =~ %r/^\s*---\s*$/
     load_yaml_from_stdin
   else
     process_line first_non_blank_line
     while((line = next_line[stdin]))
       process_line line
     end
   end

not perfect, but's it worked well enough so far

cheers.


also, from the command line i've taken to this approach

   list_input_on_stdin = ARGV.delete '-'
   yaml_input_on_stdin = ARGV.delete '---'

for, for example

   cat.rb -  # dump stdin

   cat.rb --- # load the yaml doc on stdin and dump that

note that '--' is used to indicate the end of options so it is not a good
flag.

regards.

-a
-- 
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if you want to be happy, practice compassion.  -- the dalai lama