-- Run this explicitly through -*- Lua -*-

-- Copyright 2012-2017 Daniel Silverstone <dsilvers@digital-scurf.org>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
--    notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
--    documentation and/or other materials provided with the distribution.
-- 3. Neither the name of the author nor the names of their contributors
--    may be used to endorse or promote products derived from this software
--    without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.

local lua_bin, inst_share_path, inst_bin_path, inst_mod_path, inst_plugin_path, input_name, output_name = ...

local input_fh = assert(io.open(input_name, "r"))
local output_fh = assert(io.open(output_name, "w"))

local line = input_fh:read "*l"

if not inst_mod_path:match("%?") then
   inst_mod_path = inst_mod_path .. "/?.lua"
   inst_mod_path = inst_mod_path:gsub("/+", "/")
end

local mod_path_present = false
for path_elem in package.path:gmatch("([^;]+)") do
   if path_elem == inst_mod_path then
      mod_path_present = true
      break
   end
end

do
   -- transform the plugin path from colon separated to a table
   -- for interpolation
   local path = {}
   for entry in string.gmatch(inst_plugin_path, "([^:]+)") do
      path[#path+1] = ("%q"):format(entry)
   end
   inst_plugin_path = ("{%s}"):format(table.concat(path, ", "))
end

while line do
   local token = line:match("^%-%- @@(.+)$")
   if token then
      if token == "SHEBANG" then
         output_fh:write(("#!%s\n"):format(lua_bin))
      elseif token == "GITANO_LUA_PATH" then
         if not mod_path_present then
            output_fh:write(("package.path = ('%%s;%%s'):" ..
                                "format(%q, package.path)" ..
                                "\n"):format(inst_mod_path))
         else
            output_fh:write("-- Gitano modules installed into " ..
                               inst_mod_path .. "\n")
         end
      elseif token == "GITANO_BIN_PATH" then
         output_fh:write(("gitano.config.lib_bin_path(%q)\n"):format(inst_bin_path))
      elseif token == "GITANO_SHARE_PATH" then
         output_fh:write(("gitano.config.share_path(%q)\n"):format(inst_share_path))
      elseif token == "GITANO_PLUGIN_PATH" then
         output_fh:write(("gitano.plugins.load_plugins %s\n"):format(inst_plugin_path))
      elseif token == "GITANO_I18N_PATH" then
         output_fh:write(("gitano.i18n.set_langpack_path(%q) gitano.i18n.set_category()\n"):format(inst_share_path .. "/lang"))
      else
         output_fh:write("-- Unknown token: " .. token .. "\n")
      end
   else
      output_fh:write(line .. "\n")
   end
   line = input_fh:read "*l"
end
