Bah. One, final, 1.9-compatible post that also handles the edge case of
values in the range 1000...1024 of a value correctly.
K = 2.0**10
M = 2.0**20
G = 2.0**30
T = 2.0**40
def nice_bytes( bytes, max_digits=3 )
value, suffix, precision = case bytes
when 0...K
[ bytes, 'b', 0 ]
else
value, suffix = case bytes
when K...M then [ bytes / K, 'kB' ]
when M...G then [ bytes / M, 'MB' ]
when G...T then [ bytes / G, 'GB' ]
else [ bytes / T, 'TB' ]
end
used_digits = case value
when 0...10 then 1
when 10...100 then 2
when 100...1024 then 3
end
leftover_digits = max_digits - used_digits
[ value, suffix, leftover_digits > 0 ? leftover_digits : 0 ]
end
"%.#{precision}f#{suffix}" % value
end
[ 1, 12, 123, 1022, 1024,
1234, 12345, 123456, 2**19.99, 2**20,
1234567, 12345678, 123456789,
1234567890
].each{ |bytes| puts nice_bytes( bytes ) }
#=> 1b
#=> 12b
#=> 123b
#=> 1022b
#=> 1.00kB
#=> 1.21kB
#=> 12.1kB
#=> 121kB
#=> 1017kB
#=> 1.00MB
#=> 1.18MB
#=> 11.8MB
#=> 118MB
#=> 1.15GB
--
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