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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
This command produces no output, but its exit status is 0 ("true") if $file is text, non-0 ("false") if $file is binary (or is not accessible).
-q suppresses all the output of grep
-I is the trick: if a binary file is found, it is considered a non-match
-m 1: limit "output" to first match (speed up for big files)
.: the match string, "." stands for any character
Usage: e.g. run editor only on text files
grep -qIm 1 . $file && vi $file
There is 1 alternative - vote for the best!
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