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27 lines
789 B
Ruby
Executable File
27 lines
789 B
Ruby
Executable File
#!/usr/bin/env ruby
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#
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# usage: ./preview.rb FILENAME LINENO VSPLIT(0|1)
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require 'shellwords'
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COMMAND = %[(highlight -O ansi -l {} || coderay {} || cat {}) 2> /dev/null]
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ANSI = /\x1b\[[0-9;]*m/
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REVERSE = "\x1b[7m"
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RESET = "\x1b[m"
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file, center, split = ARGV.fetch(0), ARGV.fetch(1).to_i, ARGV.fetch(2) == '1'
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height = File.readable?('/dev/tty') ? `stty size < /dev/tty`.split.first.to_i : 40
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height /= 2 if split
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height -= 2 # preview border
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offset = [1, center - height / 3].max
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IO.popen(['sh', '-c', COMMAND.gsub('{}', Shellwords.shellescape(file))]) do |io|
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io.each_line.drop(offset - 1).take(height).each_with_index do |line, lno|
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if lno + offset == center
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puts REVERSE + line.chomp.gsub(ANSI) { |m| m + REVERSE } + RESET
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else
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puts line
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end
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end
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end
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