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# Generic extensions of the language
class MutableNumber
attr_accessor :value
def initialize(n=0)
@value = n
end
def add(n=1) @value += n end
def sub(n=1) @value -= n end
def set(n) @value = n end
end
class Array
def wrap(n)
# TODO: this can be done better...
n.times { push shift }
end
def cdr(n = 1)
self[n .. -1]
end
alias car first
def sh
map do |x|
if x.respond_to? :path
x.path.to_s
else
x.to_s
end.sh
end.join(" ")
end
end
class String
def clear
self.replace("")
end
if RUBY_VERSION < '1.9'
def ord
self[0]
end
end
def ascii_only()
gsub(/[^!-~\s]/, '*')
end
def ascii_only_if(bool)
bool ? ascii_only : dup
end
def from_first(str)
self.include?(str) ? self [ self.index(str) + str.size .. -1 ] : nil
end
def from_last(str)
self.include?(str) ? self [ self.rindex(str) + str.size .. -1 ] : nil
end
def split_at_last_dot()
if ix = self.rindex('.')
return self[0...ix], self[ix+1..-1]
else
return self, ''
end
end
def before_last(str)
self.include?(str) ? self [ 0 .. rindex(str) - str.size ] : self
end
def filetype()
Directory::Entry::MIMETYPES[self] || 'unknown'
end
## encodes a string for the shell.
## peter's song.mp3 -> 'peter'\''s song.mp3'
##
## system("mplayer #{ ~some_video_file }")
def bash_escape
"'#{bash_escape_no_quotes}'"
end
def bash_escape_no_quotes
"#{ gsub("'", "'\\\\''") }"
end
alias ~ bash_escape
alias sh bash_escape
end
class Numeric
def limit(max, min = 0)
self < min ? min : (self > max ? max : self)
end
def bytes(space = true, n_round = 2)
n = 1024
a = %w(B K M G T Y)
i = 0
flt = self.to_f
while flt > n and i < a.length - 1
flt /= n
i += 1
end
# flt = flt.round(n_round)
r = 10 ** n_round
flt *= r
flt = flt.round.to_f / r
int = flt.to_i
flt = int if int == flt
return flt.to_s + (space ? ' ' + a[i] : a[i])
end
end
class Dir
def self.number_of_files(*dirs)
n = 0
dirs.each do |entry|
if File.directory?(entry)
n += 1 + number_of_files(*(Dir.new(entry).to_a - ['.', '..']).map\
{|x| File.join entry, x } )
else
n += 1
end
end
return n
end
end
class File::Stat
MODES_HASH = {
'0' => '---',
'1' => '--x',
'2' => '-w-',
'3' => '-wx',
'4' => 'r--',
'5' => 'r-x',
'6' => 'rw-',
'7' => 'rwx'
}
def modestr
if symlink?
result = 'l'
elsif directory?
result = 'd'
else
result = '-'
end
s = ("%o" % mode)[-3..-1]
for m in s.each_byte
result << MODES_HASH[m]
end
result
end
end
class Object; def or(value) self end end
class NilClass; def or(value) value end end
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