command-not-found

#!/usr/bin/env ruby

require "open3"
require "pp"
name = ARGV.shift
search = "^/bin/#{name}$"
cmd = ["nix-locate", "-1wr", search]

stdin, stdout, stderr, wait_thr = Open3.popen3(*cmd)

out = (stdout.gets(nil) or "").split("\n")
stdout.close

attrs = out
	.select { |s| s[0] != "(" }
	.map{ |s| s.sub(/\.out$/, "") }
	.sort

STDERR.puts "#{name}: command not found"
if out.length.positive? then
	STDERR.puts ""
	STDERR.puts " → #{name} is provided by:"
	attrs.each do |attr|
		STDERR.puts "    * #{attr}"
	end
end

exit 127

# vim: ft=ruby