template_filter.lua

    require 'inifile'

    if ngx.header.content_type == "text/html" then
        local file = ngx.var.request_filename
        local dir, cnt, err = ngx.re.gsub(file, "[^/]+$", "")
        local ini = dir .. "template.ini"

        local fh = io.open(ini, "r")
        if fh ~= nil then
            io.close(fh)

            if ngx.get_phase() == "header_filter" then
                ngx.header.content_length = nil

            elseif ngx.get_phase() == "body_filter" then
                local tmpl = ngx.ctx.template_variables
                local buff = ngx.ctx.chunk_buffer
                local matched = 0
                local last_chunk = ngx.arg[2]

                if not tmpl then
                    tmpl = inifile.parse(ini, false)
                    ngx.ctx.template_variables = tmpl
                end
                if buff then
                    ngx.arg[1] = buff .. ngx.arg[1]
                end

                if not last_chunk then
                    grp, err = ngx.re.match(ngx.arg[1], "<(!(-(-(\\{([^\\}]+(\\}(-(-(>)?)?)?)?)?)?)?)?)?$")
                    if err then
                        ngx.log(ngx.ERR, "re.match error: ", err)
                    else
                        ngx.log(ngx.DEBUG, "possible chunked template tag: ", grp[0])
                        matched = 1
                    end
                end
                if not last_chunk and matched then
                    buff = ngx.arg[1]
                    ngx.arg[1] = nil
                else
                    for tmplvar, tmplstr in pairs(tmpl["html"]) do
                        local str, cnt, err = ngx.re.gsub(ngx.arg[1], "<!--\\{" .. tmplvar .. "\\}-->", tmplstr)
                        if str then
                            ngx.arg[1] = str
                        else
                            ngx.log(ngx.ERR, "re.gsub error: ", err)
                        end
                    end
                end

                ngx.ctx.chunk_buffer = buff
            end
        end
    end