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if not modules then modules = { } end modules ['mtx-pdf'] = {
version = 1.001,
comment = "companion to mtxrun.lua",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local tonumber = tonumber
local format, gmatch = string.format, string.gmatch
local utfchar = utf.char
local concat = table.concat
local setmetatableindex, sortedhash, sortedkeys = table.setmetatableindex, table.sortedhash, table.sortedkeys
local helpinfo = [[
<?xml version="1.0"?>
<application>
<metadata>
<entry name="name">mtx-pdf</entry>
<entry name="detail">ConTeXt PDF Helpers</entry>
<entry name="version">0.10</entry>
</metadata>
<flags>
<category name="basic">
<subcategory>
<flag name="info"><short>show some info about the given file</short></flag>
<flag name="metadata"><short>show metadata xml blob</short></flag>
<flag name="fonts"><short>show used fonts (<ref name="detail)"/></short></flag>
<flag name="linearize"><short>linearize given file</short></flag>
</subcategory>
</category>
</flags>
</application>
]]
local application = logs.application {
name = "mtx-pdf",
banner = "ConTeXt PDF Helpers 0.10",
helpinfo = helpinfo,
}
local report = application.report
dofile(resolvers.findfile("lpdf-epd.lua","tex"))
scripts = scripts or { }
scripts.pdf = scripts.pdf or { }
local function loadpdffile(filename)
if not filename or filename == "" then
report("no filename given")
elseif not lfs.isfile(filename) then
report("unknown file '%s'",filename)
else
local pdffile = lpdf.epdf.load(filename)
if pdffile then
return pdffile
else
report("no valid pdf file '%s'",filename)
end
end
end
function scripts.pdf.info(filename)
local pdffile = loadpdffile(filename)
if pdffile then
local catalog = pdffile.Catalog
local info = pdffile.Info
local pages = pdffile.pages
local nofpages = pages.n -- no # yet. will be in 5.2
report("filename > %s",filename)
report("pdf version > %s",catalog.Version)
report("number of pages > %s",nofpages)
report("title > %s",info.Title)
report("creator > %s",info.Creator)
report("producer > %s",info.Producer)
report("creation date > %s",info.CreationDate)
report("modification date > %s",info.ModDate)
local width, height, start
for i=1, nofpages do
local page = pages[i]
local bbox = page.CropBox or page.MediaBox
local w, h = bbox[4]-bbox[2],bbox[3]-bbox[1]
if w ~= width or h ~= height then
if start then
report("cropbox > pages: %s-%s, width: %s, height: %s",start,i-1,width,height)
end
width, height, start = w, h, i
end
end
report("cropbox > pages: %s-%s, width: %s, height: %s",start,nofpages,width,height)
end
end
function scripts.pdf.metadata(filename)
local pdffile = loadpdffile(filename)
if pdffile then
local catalog = pdffile.Catalog
local metadata = catalog.Metadata
if metadata then
report("metadata > \n\n%s\n",metadata())
else
report("no metadata")
end
end
end
local function getfonts(pdffile)
local usedfonts = { }
for i=1,pdffile.pages.n do
local page = pdffile.pages[i]
local fontlist = page.Resources.Font
for k, v in next, lpdf.epdf.expand(fontlist) do
usedfonts[k] = lpdf.epdf.expand(v)
end
end
return usedfonts
end
local function getunicodes(font)
local cid = font.ToUnicode
if cid then
cid = cid()
local counts = { }
-- for s in gmatch(cid,"begincodespacerange%s*(.-)%s*endcodespacerange") do
-- for a, b in gmatch(s,"<([^>]+)>%s+<([^>]+)>") do
-- print(a,b)
-- end
-- end
setmetatableindex(counts, function(t,k) t[k] = 0 return 0 end)
for s in gmatch(cid,"beginbfrange%s*(.-)%s*endbfrange") do
for first, last, offset in gmatch(s,"<([^>]+)>%s+<([^>]+)>%s+<([^>]+)>") do
first = tonumber(first,16)
last = tonumber(last,16)
offset = tonumber(offset,16)
offset = offset - first
for i=first,last do
local c = i + offset
counts[c] = counts[c] + 1
end
end
end
for s in gmatch(cid,"beginbfchar%s*(.-)%s*endbfchar") do
for old, new in gmatch(s,"<([^>]+)>%s+<([^>]+)>") do
for n in gmatch(new,"....") do
local c = tonumber(n,16)
counts[c] = counts[c] + 1
end
end
end
return counts
end
end
function scripts.pdf.fonts(filename)
local pdffile = loadpdffile(filename)
if pdffile then
local usedfonts = getfonts(pdffile)
local found = { }
for k, v in table.sortedhash(usedfonts) do
local counts = getunicodes(v)
local codes = { }
local chars = { }
local freqs = { }
if counts then
codes = sortedkeys(counts)
for i=1,#codes do
local k = codes[i]
local c = utfchar(k)
chars[i] = c
freqs[i] = format("U+%05X %s %s",k,counts[k] > 1 and "+" or " ", c)
end
for i=1,#codes do
codes[i] = format("U+%05X",codes[i])
end
end
found[k] = {
basefont = v.BaseFont or "no basefont",
encoding = v.Encoding or "no encoding",
subtype = v.Subtype or "no subtype",
unicode = v.ToUnicode and "unicode" or "no unicode",
chars = chars,
codes = codes,
freqs = freqs,
}
end
if environment.argument("detail") then
for k, v in sortedhash(found) do
report("id : %s",k)
report("basefont : %s",v.basefont)
report("encoding : %s",v.encoding)
report("subtype : %s",v.subtype)
report("unicode : %s",v.unicode)
report("characters : %s", concat(v.chars," "))
report("codepoints : %s", concat(v.codes," "))
report("")
end
else
local results = { { "id", "basefont", "encoding", "subtype", "unicode", "characters" } }
for k, v in sortedhash(found) do
results[#results+1] = { k, v.basefont, v.encoding, v.subtype, v.unicode, concat(v.chars," ") }
end
utilities.formatters.formatcolumns(results)
report(results[1])
report("")
for i=2,#results do
report(results[i])
end
report("")
end
end
end
-- this is a quick hack ... proof of concept .. will change (derived from luigi's example) ...
-- i will make a ctx wrapper
local qpdf
function scripts.pdf.linearize(filename)
qpdf = qpdf or swiglib("qpdf.core")
local oldfile = filename or environment.files[1]
if not oldfile then
return
end
file.addsuffix(oldfile,"pdf")
if not lfs.isfile(oldfile) then
return
end
local newfile = environment.files[2]
if not newfile or file.removesuffix(oldfile) == file.removesuffix(newfile)then
newfile = file.addsuffix(file.removesuffix(oldfile) .. "-linearized","pdf")
end
local password = environment.arguments.password
local instance = qpdf.qpdf_init()
if bit32.band(qpdf.qpdf_read(instance,oldfile,password),qpdf.QPDF_ERRORS) ~= 0 then
report("unable to open input file")
elseif bit32.band(qpdf.qpdf_init_write(instance,newfile),qpdf.QPDF_ERRORS) ~= 0 then
report("unable to open output file")
else
report("linearizing %a into %a",oldfile,newfile)
qpdf.qpdf_set_static_ID(instance,qpdf.QPDF_TRUE)
qpdf.qpdf_set_linearization(instance,qpdf.QPDF_TRUE)
qpdf.qpdf_write(instance)
end
while qpdf.qpdf_more_warnings(instance) ~= 0 do
report("warning: %s",qpdf.qpdf_get_error_full_text(instance,qpdf.qpdf_next_warning(qpdf)))
end
if qpdf.qpdf_has_error(instance) ~= 0 then
report("error: %s",qpdf.qpdf_get_error_full_text(instance,qpdf.qpdf_get_error(qpdf)))
end
qpdf.qpdf_cleanup_p(instance)
end
-- scripts.pdf.info("e:/tmp/oeps.pdf")
-- scripts.pdf.metadata("e:/tmp/oeps.pdf")
-- scripts.pdf.fonts("e:/tmp/oeps.pdf")
-- scripts.pdf.linearize("e:/tmp/oeps.pdf")
local filename = environment.files[1] or ""
if filename == "" then
application.help()
elseif environment.argument("info") then
scripts.pdf.info(filename)
elseif environment.argument("metadata") then
scripts.pdf.metadata(filename)
elseif environment.argument("fonts") then
scripts.pdf.fonts(filename)
elseif environment.argument("linearize") then
scripts.pdf.linearize(filename)
elseif environment.argument("exporthelp") then
application.export(environment.argument("exporthelp"),filename)
else
application.help()
end
-- a variant on an experiment by hartmut
--~ function downloadlinks(filename)
--~ local document = lpdf.epdf.load(filename)
--~ if document then
--~ local pages = document.pages
--~ for p = 1,#pages do
--~ local annotations = pages[p].Annots
--~ if annotations then
--~ for a=1,#annotations do
--~ local annotation = annotations[a]
--~ local uri = annotation.Subtype == "Link" and annotation.A and annotation.A.URI
--~ if uri and string.find(uri,"^http") then
--~ os.execute("wget " .. uri)
--~ end
--~ end
--~ end
--~ end
--~ end
--~ end
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