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require 'optparse'
require_relative 'vpath'
require_relative 'colorize'
class AtomicWrite
attr_accessor :vpath, :timestamp, :output, :compare :color
def initialize
@vpath = nil
@timestamp = nil
@output = nil
@compare = nil
@color = nil
end
def def_options(opt)
opt.on('-t', '--timestamp[=PATH]') {|v| @timestamp = v || true}
opt.on('-o', '--output=PATH') {|v| @output = v}
opt.on('-c', '--[no-]if-change') {|v| @compare = v}
opt.on('--color') {@color = true}
@vpath.def_options(opt) if @vpath
opt
end
def emit(result)
output = @output
if output
update output, result
stamp output
else
print result
end
end
def update(output, result)
color = Colorize.new(@color)
unchanged = color.pass("unchanged")
updated = color.fail("updated")
vpath = @vpath || File
if @compare and (vpath.open(output, "rb") {|f| f.read} rescue nil) == result
puts "#{output} #{unchanged}"
false
else
open(output, "wb") {|f| f.print result}
puts "#{output} #{updated}"
true
end
end
def stamp(output, timestamp = @timestamp)
if timestamp
if timestamp == true
dir, base = File.split(output)
timestamp = File.join(dir, ".time." + base)
end
File.open(timestamp, 'a') {}
File.utime(nil, nil, timestamp)
end
end
end
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