A still-concise extension of the standard ‘file’ info.

about.rb

#! /usr/bin/env ruby

# about — A still-concise extension of the standard ‘file’ info.
#
# Author:  Micah Elliott http://MicahElliott.com
# License: WTFPL http://sam.zoy.org/wtfpl/
#
# Combine standard file utils (eg, file, wc, head, tail, sort, stat) to
# give pieces of information about a file. Informs about file length,
# sorted-ness, and other meta-data.
#
# Should have special accomodations for specific file types. This really
# makes it a “super-file” utility, but that’s a crappy name.
#
# File types to treat specially:
# * Videos: ffmpeg -i
# * Images: identify (from ImageMagick)
# * Archives: tar, zipinfo (NYI)
#
# There are several more file types that have interesting utilties to
# tell you more about them. I’m planning to extend/improve this as I
# encounter more types. Examples:
# * language source files (stats, lint-passing, VCS-dirty, etc)
# * license info
#
# Areas for extension:
# * following of symlinks
# * recognition/printing of line-3 for script “about” summary details
# * more use of special utils for meta-info
# * reporting of extended file attributes
#   (http://en.wikipedia.org/wiki/Extended_file_attributes)
# * smarter treatment of non-text files
# * color!

require 'pathname'

$usage = 'about.rb file1 …'

def print_lines lines
  if lines[0..2].join.length < 3 * 80 then
    puts lines[0..2]
  else
    puts "lines too long"
  end
end

def get_info p
  #map = {
  #  ".mp3"
  fileinfo = `file -b #{p.to_s}`
  util = case p.extname.downcase
    when ".mp3",".mp4",".avi",".flv" then
      "\n" + (`mp4info #{p.to_s} 2>&1`) + "\n"
    when ".xcf",".png" then
      `identify #{p.to_s} 2>&1`
    else
      `file -b #{p.to_s}`  # exclude filename in file’s output.
  end
  #return `#{util} #{p.to_s} 2>&1`.split("\n")[-4..-2]
end

def about fname
  print "NAME:      "
  puts fname
  p = Pathname.new fname
  realpath = p.realpath.to_s
  if realpath != fname then
    puts "REALPATH:  #{realpath}"
  end
  ### Don’t include filename in file’s output.
  fileinfo = get_info p
  print "FILEINFO:  " + fileinfo
  ### Determine size.
  print "SIZE:      "
  f = File.open fname
  stat_size = f.stat.size
  if stat_size < 10000
    puts f.stat.size
  else
    puts `du -h #{fname}`.split[0]
  end
  ##print "STAT:      "
  ##system "ls -hl #{fname}"
  ##wc = `wc -l #{fname}`.split[0]
  lines = f.readlines
  wc = lines.length
  puts "LINES:     #{wc}"
  print "SORTED:    "
  puts system("sort -C #{fname}") ? "yes" : "no"

  if fileinfo.match "text" then
    ##system "stat #{fname}"
    puts
    if lines.length < 3
      puts "only #{lines.length} lines!\n"
      return
    end
    puts "HEAD...TAIL:"
    print_lines lines[0..2]
    ##system "head -3 #{fname}"
    puts "==8<--->8=="
    print_lines lines[-3..-1]
    puts
    ##system "tail -3 #{fname}"
  #else
  #  exit 1
  end
end

if $0 == __FILE__
  if ARGV.size == 0
    print $usage
    exit
  end
  ARGV.each do |fname|
    puts '---' if ARGV.size > 1
    about fname
  end
end