list/select and rewrite ~/.mikutter symlink

mselect.rb

#!/usr/bin/env ruby

FLOATING_PATH = File.join(ENV["HOME"], ".mikutter")
FLOATING_PATH_DIR = File.dirname(FLOATING_PATH)
FLOATING_PATH_BASE = File.basename(FLOATING_PATH)

if File.exists? FLOATING_PATH and not File.symlink? FLOATING_PATH
  puts "error: #{FLOATING_PATH} exists but not a symlink"
  exit 1
end

current_link = File.basename(File.readlink(FLOATING_PATH))

candidates = Dir.entries(FLOATING_PATH_DIR).select{ |entry|
  entry =~ /^#{FLOATING_PATH_BASE}/
}.reject{ |entry|
  entry == FLOATING_PATH_BASE
}

select = 1
candidates.each do |dir|
  if dir == current_link
    printf " <%d> ", select
  else
    printf "  %d  ", select
  end
  puts dir
  select += 1
end

changeto = nil
loop do
  print "change to [1..#{select-1} or query]: "
  changeto = STDIN.gets
  if changeto == nil
    puts
    puts "cancelled"
    exit
  end
  changeto.chomp!

  match = candidates.select{ |dir| dir =~ /#{changeto}/ }
  if changeto =~ /^\d+$/
    break if (1..select-1).to_a.include? changeto.to_i
  elsif match.size == 1
    changeto = candidates.index(match.first) + 1
    break
  else
    p match
  end
  
end

newdir = candidates[changeto.to_i-1]

File.delete FLOATING_PATH
File.symlink File.join(FLOATING_PATH_DIR, newdir), FLOATING_PATH

puts "updated symbolic link: #{FLOATING_PATH_BASE} => #{newdir}"