-- common.lua: functions from my LUA_INIT file.
-- This file:
--   http://angg.twu.net/blogme4/common.lua.html
--   http://angg.twu.net/blogme4/common.lua
--                (find-blogme4 "common.lua")
-- Author: Eduardo Ochs <[email protected]>
-- Version: 2011aug04
-- License: GPL3
--

-- «.pathto»	(to "pathto")


-- (find-angg "LUA/lua50init.lua" "readfile")
-- (find-angg "LUA/lua50init.lua" "writefile")
readfile = function (fname)
    local f = assert(io.open(fname, "r"))
    local bigstr = f:read("*a")
    f:close()
    return bigstr
  end
writefile = function (fname, bigstr)
    local f = assert(io.open(fname, "w+"))
    f:write(bigstr)
    f:close()
  end

-- (find-angg "LUA/lua50init.lua" "printf")
printf = function (...) io.write(string.format(...)) end

-- (find-angg "LUA/lua50init.lua" "pack-and-unpack")
pack   = table.pack or function (...) return {n=select("#", ...), ...} end
unpack = function (T) return table.unpack(T, 1, T.n) end

-- (find-angg "LUA/lua50init.lua" "mapconcat")
map = function (f, arr, n)
    local brr = {}
    for i=1,(n or #arr) do table.insert(brr, f(arr[i])) end
    return brr
  end
mapconcat = function (f, tbl, sep) return table.concat(map(f, tbl), sep) end
nop = function () end
id  = function (...) return ... end

-- (find-angg "LUA/lua50init.lua" "gformat")
-- Examples: gformat "<%1_%1>" "foo"                  --> "<foo_foo>"
-- mapconcat(gformat "<%1_%1>", split "foo ba", ", ") --> "<foo_foo>, <ba_ba>"
gformat = function (fmt, pat)
    return function (str)
        return (str:gsub((pat or "^.*$"), fmt))
      end
  end


-- (find-angg "LUA/lua50init.lua" "split")
split = function (str, pat)
    local T = {}
    string.gsub(str, pat or "([^%s]+)", function (word) T[#T+1] = word end)
    return T
  end

-- (find-angg "LUA/lua50init.lua" "splitlines")
splitlines = function (bigstr)
    local lines = split(bigstr, "([^\n]*)\n?")
    table.remove(lines)
    return lines
  end
maplines = function (f, bigstr)
    return mapconcat(f, splitlines(bigstr), "\n")
  end

-- (find-angg "LUA/lua50init.lua" "mytostring")
tos_compare_pairs = function (pair1, pair2)
    local key1,  key2  = pair1.key,  pair2.key
    local type1, type2 = type(key1), type(key2)
    if type1 == type2 then
      if type1 == "number" then return key1 < key2 end
      if type1 == "string" then return key1 < key2 end
      return tostring(key1) < tostring(key2)  -- fast
    else
      return type1 < type2   -- numbers before strings before tables, etc
    end
  end
tos_sorted_pairs = function (T)
    local Tpairs = {}
    for key,val in pairs(T) do
      table.insert(Tpairs, {key=key, val=val})
    end
    return sorted(Tpairs, tos_compare_pairs)
  end
tos_table_orig = function (T, sep)
    return "{"..mapconcat(tos_pair, tos_sorted_pairs(T), sep or ", ").."}"
  end
tos_table = tos_table_orig
tos = function (o)
    local t = type(o)
    if t=="number" then return tostring(o) end
    if t=="string" then return string.format("%q", o) end
    if t=="table"  then return tos_table(o) end
    return "<"..tostring(o)..">"
  end
tos_key = tos              -- change this to print string keys differently
tos_pair = function (pair)
    return tos_key(pair.key).."="..tos(pair.val)
  end

mysort = tos_sorted_pairs   -- compatibility
mytostring = tos            -- compatibility
mytostring_arg = function (T, sep)
    return mapconcat(tos, T, sep or " ", T.n)
  end

-- Tools for building extensions
tos_good_string_key = function (key)
    return type(key) == "string" and key:match("^[A-Za-z_][A-Za-z_0-9]*$")
  end
tos_has_tostring = function (o)
    return getmetatable(T) and getmetatable(T).__tostring
  end
tos_has_eootype = function (o)
    return type(o) == "table" and getmetatable(o) and getmetatable(o).type
  end

-- (find-angg "LUA/lua50init.lua" "PP")
PP = function (...)
    local arg = pack(...)
    for i=1,arg.n do printf(" %s", tos(arg[i])) end
    printf("\n")
    return ...
  end

-- (find-angg "LUA/lua50init.lua" "translatechars")
translatechars = function (str, re, tbl)
    return (str:gsub(re, function (c) return tbl[c] or c end))
  end

-- (find-angg "LUA/lua50init.lua" "each2")
each2 = function (T)
    local i = 1
    return function ()
        if i <= #T then i = i+2; return T[i-2], T[i-1] end
      end
  end

-- (find-blogme3 "blogme3.lua" "blogmedir")
fnamedirectory    = function (fname) return fname:match"^(.*/)[^/]*$"  end
fnamenondirectory = function (fname) return fname:match     "([^/]*)$" end

-- «pathto»  (to ".pathto")
-- (find-blogme4 "options.lua" "dooption_o")
pathtoroot  = ""
pathtoroot_ = function (path)
    local _, nslashes = path:gsub("/", "/")
    return ("../"):rep(nslashes)
  end
pathto = function (path) return pathtoroot..path end



-- dump-to: tests
--[==[
* (eepitch-lua51)
* (eepitch-kill)
* (eepitch-lua51)
require "common"
PP(maplines(gformat "<%1>", "foo\nbar\nplic"))

--]==]


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-- ee-anchor-format:   "«%s»"
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