From 3554232ccc8e1f7a121eb25c31867bab2de85b64 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg42.2a@gmail.com>
Date: Fri, 17 May 2013 13:34:36 +0200
Subject: add script to extract parts of ``char-def.lua``

---
 mkcharacters | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100755 mkcharacters

diff --git a/mkcharacters b/mkcharacters
new file mode 100755
index 0000000..0ec871e
--- /dev/null
+++ b/mkcharacters
@@ -0,0 +1,120 @@
+#!/usr/bin/env texlua
+-----------------------------------------------------------------------
+--         FILE:  mkcharacters.lua
+--        USAGE:  ./mkcharacters.lua 
+--  DESCRIPTION:  import parts of char-def.lua
+-- REQUIREMENTS:  lua, lpeg, ConTeXt, the lualibs package
+--       AUTHOR:  Philipp Gesang (Phg), <phg42.2a@gmail.com>
+--      VERSION:  1.0
+--      CREATED:  2013-05-17 12:41:39+0200
+-----------------------------------------------------------------------
+-- we create a stripped-down version of char-def.lua
+-----------------------------------------------------------------------
+
+
+-----------------------------------------------------------------------
+--                              config
+-----------------------------------------------------------------------
+local charfile      = "./luaotfload-characters.lua"
+local chardef       = "~phg/base/char-def.lua"
+local import        = { "direction", "mirror", } --> πολυγλωσσία/uax9
+
+-----------------------------------------------------------------------
+--                             includes
+-----------------------------------------------------------------------
+
+kpse.set_program_name"luatex"
+
+for _, lib in next, { "lualibs-lua.lua",
+                      "lualibs-lpeg.lua",
+                      "lualibs-table.lua", } do
+  local found = assert(kpse.find_file(lib, "lua"),
+                       "Could not locate " .. lib .. ".\n"
+                       .. "Please install the lualibs package.")
+  require(found)
+end
+
+if not (chardef and lfs.isfile(chardef)) then
+  --- we could grab the file from contextgarden but as Context is part
+  --- of TL it’s not worth bothering 
+  chardef = assert(kpse.find_file("char-def.lua", "lua"),
+                   "Could not find ConTeXt.")
+end
+
+-----------------------------------------------------------------------
+--                           functionality
+-----------------------------------------------------------------------
+
+local get_characters = function ( )
+  local data
+  local inchan = io.open(chardef, "r")
+  if not inchan then
+    io.write("Could not open file for reading: "..chardef.."\n.")
+    goto fail
+  end
+  data = inchan:read "*all"
+  inchan:close()
+  data = loadstring(data)
+  if data then
+    data() --> characters.data
+    data = nil
+    collectgarbage "collect"
+    if characters.data and next(characters.data) then
+      return characters.data
+    end
+    io.write "Character table empty.\n"
+    goto fail
+  end
+  io.write(chardef .. " is not a valid Lua file.\n")
+  ::fail::
+  io.write "Emergency exit.\n"
+  os.exit(1)
+end
+
+local extract_fields_indeed
+extract_fields_indeed = function (data, acc, lastidx)
+  local idx, char = next(data, lastidx)
+  if idx then
+    local imported = { }
+    for i=1, #import do
+      local field = import[i]
+      imported[field] = char[field]
+    end
+    acc[idx] = imported
+    return extract_fields_indeed(data, acc, idx)
+  end
+  return acc
+end
+
+local extract_fields = function (data)
+  return extract_fields_indeed(data, {}, nil)
+end
+
+local writedata = function (data)
+  local outchan = io.open(charfile, "w")
+  if not outchan then
+    io.write("Could not open "..charfile.." for writing.\n")
+    return false
+  end
+  outchan:write(data)
+  outchan:close()
+  return true
+end
+
+do
+  local chardata    = get_characters()
+  local stripped    = extract_fields(chardata)
+  local serialized  = table.serialize(stripped)
+  if writedata(serialized) then
+    goto done
+  end
+  goto fail
+end
+
+::done::
+  os.exit(0)
+
+::fail::
+  io.write "Emergency exit.\n"
+  os.exit(1)
+
-- 
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