TODO

todo

#!/usr/bin/env ruby
# vim: set filetype=ruby :

require 'date'

plan = File.read(File.expand_path('~/.plan'))

date = nil
indent = 0

def color(string, *nums)
  return nil if string.nil?
  codes = nums.map{|num| "\e[#{num}m"}.join
  "#{codes}#{string}\e[0m"
end

def emphasize(string)
  color string, 32, 1
end

def alert(string)
  color string, 31
end

def light(string)
  color string, 36
end

def deemphasize(string)
  color string, '1;30'
end

class Task < Struct.new(:text, :date, :priority, :lineno)
  # Order by priority, then natural order
  def <=>(task)
    if (res = task.priority <=> priority) == 0
        res = task.lineno <=> lineno
    end
    res
  end

  def to_s
    "* %s %s %s\n%s" % [preamble, emphasize(title.chomp), suffix, body]
  end

  def title
    text.each_line.first
  end

  def body
    text.each_line.to_a[1..-1].join
  end

  def preamble
    [
      priority > 0 ? alert('!' * priority) : nil,
    ].compact.join(' ')
  end

  def suffix
    [
      light(date),
      deemphasize(":#{lineno}"),
    ].compact.join(' ')
  end
end

tasks = []

plan.each_line.with_index(1) do |line, index|
  case line
  # Open Task
  # e.g. "  [ ] Some thing"
  when /^(?<indent>\s*)\[\s*\]\s*(?<priority>\!*)\s*(?<task>.+)/
    taskname = $~[:task]
    priority = $~[:priority].length
    tasks << Task.new(taskname, date, priority, index)
    indent = $~[:indent].length
  when /^(?<indent>\s+)(?<text>.+)/
    len = $~[:indent].length
    if len > indent && !tasks.last.nil?
      tasks.last.text += "\n" + ' '*(len - indent) + $~[:text]
    end
  when /\d{4}-\d{1,2}-\d{1,2}/ # match 1999-11-31 style date
    date = Date.parse($~.to_s)
    #p date
  #else
  end
end

tasks.sort.each do |task|
  puts task
end