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module(...,package.seeall)
local eb = require("exec_epub")
local dom = require("luaxml-domobject")
local ext = "xhtml"
local outputdir = nil
local input = nil
function prepare(params)
local basedir = params.input.."-".. params.format
local outputdir_name="OEBPS"
outputdir= basedir.."/"..outputdir_name
input = params.input
params.ext = ext
params.tex4ht_sty_par = params.tex4ht_sty_par .. ",html5"
params.packages = params.packages .. string.format("\\Configure{ext}{%s}",ext)
return eb.prepare(params)
end
function run(out,params)
return eb.run(out, params)
end
local function makeTOC(document)
local template = [[
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:epub="http://www.idpf.org/2007/ops"
>
<head><title>TOC</title></head>
<body>
<nav id="pub-toc" epub:type="toc">
<h1>Table of contents</h1>
<ol class="toc" hidden="hidden">
<li>
<a href="${document}">Document</a>
</li>
</ol>
</nav>
</body>
</html>
]] % {document=document}
return template
end
local function add_media_overlays(content)
local add_meta = function(package, attributes, text)
local meta = package:create_element("meta",attributes)
local dur_el = meta:create_text_node(text)
meta:add_child_node(dur_el)
package:add_child_node(meta)
end
-- calculate total audio time
local calc_times = function(times)
local time = 0
for _, curr in ipairs(times) do
-- smil file contains timestamps in the H:M:S format, we need to parse it
local hours, minutes, seconds = curr:match("(%d+):(%d+):(%d+)")
time = time + os.time({year=1970, day=1, month=1, hour=hours, min=minutes, sec=seconds})
end
return os.date("%H:%M:%S",time)
end
local opfdom = dom.parse(content)
local items = opfdom:query_selector("manifest item")
local ref = {}
local times = {}
local package = opfdom:query_selector("metadata")[1]
-- we must read all smil files and find references to html files
-- it is necessary to add media-overlay attribute to the referenced items
for _, item in ipairs(items) do
local href = item:get_attribute("href")
ref[href] = item
-- we must read audio length from the smil file and add it as a <meta> property
if href:match("smil$") then
local f = io.open(outputdir .. "/" .. href, "r")
if not f then break end
local smil = f:read("*all")
f:close()
local smildom = dom.parse(smil)
local audios = smildom:query_selector("audio")
local last = audios[#audios]
-- add audio duration to the metadata section
if last then
local duration = last:get_attribute("clipend")
if duration then
-- todo: calculate total audio length
table.insert(times, duration)
local audio_id = item:get_attribute("id")
add_meta(package, {property="media:duration", refines="#"..audio_id}, duration)
end
end
-- add the media-overlay attribute
local textref = smil:match('epub:textref="(.-)"')
local id = item:get_attribute("id")
local referenced = ref[textref]
if referenced then
referenced:set_attribute("media-overlay", id)
end
end
end
-- calculate length of all media overlay audio files
if #times > 0 then
local totaltime = calc_times(times)
add_meta(package,{property="media:duration"}, totaltime)
end
local serialized = opfdom:serialize()
return serialized
end
local function cleanOPF()
-- in epub3, there must be table of contents
-- if there is no toc in the document, we must add generic one
local opf = "content.opf"
local f = io.open(opf,"r")
if not f then
print("Cannot open "..opf .. " for toc searching")
return nil
end
local content = f:read("*all")
f:close()
if content:find "properties[%s]*=[%s]*\"[^\"]*nav" then
print "TOC nav found"
else
print "no TOC, using generic one"
local inputfile = input .. "." .. ext
print("Main file name", inputfile)
-- write toc file
local toc_name = "generic_toc" .."."..ext
local f = io.open(outputdir .. "/" .. toc_name, "w")
f:write(makeTOC(inputfile))
f:close()
-- add toc file to the conten.opf
content = content:gsub("<manifest>","<manifest>\n<item id='htmltoc'" ..
" properties=\"nav\" media-type=\"application/xhtml+xml\" href=\""..
toc_name .."\" />\n")
content = content:gsub("<spine([^>]*)>", "<spine%1>\n<itemref idref=\"htmltoc\" linear=\"no\"/>\n")
-- remove empty guide element
end
-- content = content:gsub("<guide>%s*</guide>","")
content = eb.remove_empty_guide(content)
content = add_media_overlays(content)
f = io.open(outputdir .. "/" ..opf,"w")
f:write(content)
f:close()
--makeTOC(inputfile)
end
function writeContainer()
--local ret = eb.writeContainer()
eb.make_opf()
cleanOPF()
local ret = eb.pack_container()
return ret
end
function clean()
return eb.clean()
end
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