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#!/usr/bin/env ruby
require 'tempfile'
require 'term/ansicolor'
require 'open-uri'
require 'tins/xt'
include Tins::GO
def provide_ppm_file(filename, opts)
pnmtopnm = `which pnmtopnm`
if pnmtopnm.empty?
STDERR.puts "You might consider installing netpbm to enable image conversion/scaling!"
File.new(filename, 'rb')
else
cmd = [ pnmtopnm.chomp! ]
ext = File.extname(filename)
scale = `which pamscale`.chomp!
console_scale = "#{scale} -#{opts['s']} #{opts['C']} #{opts['R']}"
cmd.unshift console_scale
aspect_scaling = "#{scale} -xscale #{opts['a']}"
cmd.unshift aspect_scaling
convert_to_pnm =
case ext
when /\A(\.ppm\d*|\.pnm|\z)/
''
when /\A.(jpe?g|exif|jfif)\z/i
'jpegtopnm'
when /\A.tiff?\z/i
'tifftopnm'
else
"#{ext[1..-1].downcase}topnm"
end
unless convert_to_pnm.empty?
convert_to_pnm = `which #{convert_to_pnm}`.chomp!
convert_to_pnm.empty? and fail "unknown pnm converter #{convert_to_pnm}"
cmd.unshift convert_to_pnm
end
temp = Tempfile.open(File.basename($0))
cmd *= '|'
STDERR.puts "Executing #{cmd.inspect}"
IO.popen(cmd, 'r+') do |converter|
open(filename, 'rb') do |input|
until input.eof?
converter.write input.read(8192)
end
converter.close_write
end
until converter.eof?
temp.write(converter.read)
end
end
temp.tap(&:rewind)
end
end
def usage(rc = 0)
puts to <<-end
Usage: #$0 [OPTIONS] FILENAME"
Options are
-m METRIC for distance (METRIC = #{Term::ANSIColor::RGBColorMetrics.metrics * '|'})
-g yes|no use/don't use gray values, defaults to yes
-s xyfit|xyfill scaling strategy, defaults to xyfit
-a ASPECT x:y aspect, defaults to 2.2
-C COLS number of columns for rendering with aspect, defaults to max
-R ROWS number of rows for rendering with aspect, defaults to max - 1
-h this help
end
exit rc
end
opts = go 'hm:g:s:a:C:R:'
opts['h'] and usage
filename = ARGV.shift or usage 1
metric = Term::ANSIColor::RGBColorMetrics.metric(opts['m'] || 'CIELab')
gray = (opts['g'] || 'yes') == 'yes'
opts['s'] ||= 'xyfit'
opts['a'] ||= '2.2'
opts['C'] ||= Tins::Terminal.cols
opts['R'] ||= [ Tins::Terminal.rows - 1, 0 ].max
file = provide_ppm_file(filename, opts)
ppm = Term::ANSIColor::PPMReader.new(
file,
:metric => metric,
:gray => gray
)
puts ppm
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