-- vim: set noexpandtab :miv --

-- ┌──────────────────────────┐
-- │ Generic Helper Functions │
-- └──────────────────────────┘

match_all = (str, pat, init=0) ->
	s,e = str\find(pat, init)
	if s then
		return str\sub(s,e), match_all(str, pat, e+1)
match_lines = (str) -> match_all(str, '[^\n]+')

-- ┌──────────────────┐
-- │ Actual Functions │
-- └──────────────────┘

tree = (tab, pref='') ->
	print tab.title and tab.title or '┐'

	for idx, element in ipairs tab
		last = idx == #tab
		first = idx == 1
		io.write pref
		io.write last and "└─" or "├─"
		switch type element
			when "table"
				tree element, pref .. (last and '  ' or '│ ')
			else
				print tostring element

pad = (str='', len) ->
	str..string.rep(" ", len-#str)

import max from math

chktbl = (obj) -> error("Object is not a table", 2) if type(obj) ~= 'table'
to_tab = (obj) -> type(obj)=='table' and obj or {match_lines tostring obj}

tab = (rows) ->
	-- Get Measurements
	chktbl(rows)
	width = {}
	height = {}
	for row, fields in ipairs rows
		chktbl(fields)
		height[row] = 1
		for col, lines in ipairs fields
			lines = to_tab lines
			height[row] = max(height[row], #lines)
			for line in *lines do
				width[col] = max(width[col] or 1, #line)
			fields[col] = lines
	bars = [string.rep('─', i+2) for i in *width]
	-- Top Line
	print '┌'..table.concat(bars, '┬')..'┐'
	-- Rows
	for row, fields in ipairs rows
		for line=1,height[row]
			io.write '│' -- Outer Left Border
			for col, lines in ipairs fields
				io.write ' '..pad(lines[line], width[col])..' '
				io.write '│' if col < #fields
			print '│' -- Outer Left Border
		print '├'..table.concat(bars, '┼')..'┤' unless row == #rows
	print '└'..table.concat(bars, '┴')..'┘'

col = (col) -> tab([{elem} for elem in *col])
row = (row) -> tab{row}
box = (box) -> tab{{box}}

line = (len=80) -> print string.rep('─', len)
line2 = (len=80) ->
	error('Length must be at least 2 characters', 2) if len < 2
	print '┌'..string.rep('─', len-2)..'┐'
	print '└'..string.rep('─', len-2)..'┘'

CLASS = [[
print vim.col {
	'Class' -- Title
	{
		-- Members
	}
	{
		-- Methods
	}
}
]]

DRAW = [[
─ ━ │ ┃ ┄ ┅ ┆ ┇ ┈ ┉ ┊ ┋ ┌ ┍ ┎ ┏
┐ ┑ ┒ ┓ └ ┕ ┖ ┗ ┘ ┙ ┚ ┛ ├ ┝ ┞ ┟
┠ ┡ ┢ ┣ ┤ ┥ ┦ ┧ ┨ ┩ ┪ ┫ ┬ ┭ ┮ ┯
┰ ┱ ┲ ┳ ┴ ┵ ┶ ┷ ┸ ┹ ┺ ┻ ┼ ┽ ┾ ┿
╀ ╁ ╂ ╃ ╄ ╅ ╆ ╇ ╈ ╉ ╊ ╋ ╌ ╍ ╎ ╏
═ ║ ╒ ╓ ╔ ╕ ╖ ╗ ╘ ╙ ╚ ╛ ╜ ╝ ╞ ╟
╠ ╡ ╢ ╣ ╤ ╥ ╦ ╧ ╨ ╩ ╪ ╫ ╬ ╭ ╮ ╯
╰ ╱ ╲ ╳ ╴ ╵ ╶ ╷ ╸ ╹ ╺ ╻ ╼ ╽ ╾ ╿ ]]

ARROWS = [[
← ↑ → ↓ ↔ ↕ ↖ ↗ ↘ ↙ ▲ ▼ ◀ ▶ ➔ ➘
➙ ➚ ➛ ➜ ➝ ➞ ➟ ➠ ➡ ➢ ➣ ➤ ➥ ➦ ↪ ↩
↚ ↛ ↜ ↝ ↞ ↟ ↠ ↡ ↢ ↣ ↤ ↦ ↥ ↧ ↨ ↫
↬ ↭ ↮ ↯ ↰ ↱ ↲ ↴ ↳ ↵ ↶ ↷ ↸ ↹ ↺ ↻
⟲ ⟳ ↼ ↽ ↾ ↿ ⇀ ⇁ ⇂ ⇃ ⇄ ⇅ ⇆ ⇇ ⇐ ⇑
⇒ ⇓ ⇔ ⇌ ⇍ ⇏ ⇕ ⇖ ⇗ ⇘ ⇙ ⇙ ⇳ ⇚ ⇛ ⇜
⇝ ⇞ ⇟ ⇟ ⇟ ⇠ ⇡ ⇢ ⇣ ⇤ ⇥ ⇦ ⇨ ⇩ ⇪ ⇧
⇫ ⇬ ⇭ ⇮ ⇯ ⇰ ⇱ ⇲ ⇴ ⇵ ⇶ ⇷ ⇸ ⇹ ⇺ ⇺
⇻ ⇼ ⇽ ⇾ ⇿ ⟰ ⟱ ⟴ ⟵ ⟶ ⟷ ⟸ ⟹ ⟽ ⟾ ⟺
⟻ ⟼ ⟿ ⤀ ⤁ ⤅ ⤂ ⤃ ⤄ ⤆ ⤇ ⤈ ⤉ ⤊ ⤋ ⤌
⤍ ⤎ ⤏ ⤐ ⤑ ⤒ ⤓ ⤔ ⤕ ⤖ ⤗ ⤘ ⤙ ⤙ ⤚ ⤛
⤜ ⤝ ⤞ ⤡ ⤢ ⤣ ⤤ ⤥ ⤦ ⤧ ⤨ ⤩ ⤪ ⤭ ⤮ ⤯
⤰ ⤱ ⤲ ⤳ ⤻ ⤸ ⤾ ⤿ ⤺ ⤼ ⤽ ⤴ ⤵ ⤶ ⤷ ⤹
⥀ ⥁ ⥂ ⥃ ⥄ ⥅ ⥆ ⥇ ⥈ ⥉ ⥒ ⥓ ⥔ ⥕ ⥖ ⥗
⥘ ⥙ ⥚ ⥛ ⥜ ⥝ ⥞ ⥟ ⥠ ⥡ ⥢ ⥣ ⥤ ⥥ ⥦ ⥧
⥨ ⥩ ⥪ ⥫ ⥬ ⥭ ⥮ ⥯ ⥰ ⥱ ⥲ ⥳ ⥴ ⥵ ⥶ ⥷
⥸ ⥹ ⥺ ⥻ ➧ ➨ ➩ ➪ ➫ ➬ ➭ ➮ ➯ ➱ ➲ ➳
➴ ➵ ➶ ➷ ➸ ➹ ➺ ➻ ➼ ➽ ➾ ⬅ ⬆ ⬇ ⏎ ⬎
⬏ ⬐ ⬑ ☈ ☇ ⍃ ⍄ ⍇ ⍈ ⍐ ⍗ ⍌ ⍓ ⍍ ⍔ ⍏
⍖ ⍅ ⍆ ⬈ ⬉ ⬊ ⬋ ⬌ ⬍ ⬀ ⬁ ⬂ ⬃ ⬄ ]] 

{
	:tree, :box, :tab, :col, :row, :line, :line2
	:CLASS, :DRAW, :ARROWS
	-- Aliases
	table: tab
}