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%D \module
%D [ file=m-zint,
%D version=2010.12.07,
%D title=\CONTEXT\ Extra Modules,
%D subtitle=Zint Barcode Generator,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=PRAGMA]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D Using \type {zint} seems to be the easiest way to generate
%D (PDF417) barcodes so therefore we now have this module. There
%D are proper (also windows) binaries at:
%D
%D \starttyping
%D http://www.zint.org.uk
%D \stoptyping
%D
%D There is a bit more code than needed as we want to be able to
%D feed names.
\startluacode
moduledata.zint = { }
local format, lower, gsub = string.format, string.lower, string.gsub
local patterns = lpeg.patterns
local zint = "zint" -- '"c:/program files/zint/zint.exe"'
local whitespace = patterns.whitespace
local spaces = whitespace^0
local key = (spaces / "") * patterns.digit^0 * (patterns.colon * spaces / "")
local value = (whitespace / "" + (1 - key))^1
local pattern = lpeg.Cf(lpeg.Ct("") * (lpeg.Cg((lpeg.Cs(key) / tonumber) * (lpeg.Cs(value) / lower)) + patterns.anything)^0,rawset)
local reverse
local function cleancode(code)
return lower(gsub(code," ",""))
end
local function numberofcode(code)
if not reverse then
local types = os.resultof(format("%s --types",zint)) or ""
local formats = lpeg.match(pattern,types)
reverse = table.swapped(formats) or { }
end
code = cleancode(code)
return reverse[code] or code
end
function moduledata.zint.generate(code,data,suffix,options)
if not data or data == "" then
data = "unset"
end
local code = cleancode(code)
local base = format("zint-%s-%s",code,md5.hex(data))
local name = file.addsuffix(base,suffix or "eps")
if not lfs.isfile(name) then
local temp = file.addsuffix(base,"tmp")
local code = numberofcode(code)
logs.simple("using 'zint' to generate '%s'",base)
io.savedata(temp,data)
os.execute(format('%s --barcode=%s --output="%s" --input="%s"',zint,code,name,temp,options or ""))
end
return name
end
\stopluacode
\doifnotmode{demo}{\endinput}
\starttext
\externalfigure[\cldcontext{moduledata.zint.generate("PDF417",[[Hans Hagen]])}]
\blank
\externalfigure[\cldcontext{moduledata.zint.generate("PDF417","Ton Otten")}]
\blank
\externalfigure[\cldcontext{moduledata.zint.generate("ISBN","9789490688011")}]
\stoptext
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