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if not modules then modules = { } end modules ['util-lib-imp-gs'] = {
version = 1.001,
comment = "a mkiv swiglib module",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
local insert = table.insert
local formatters = string.formatters
local ghostscript = utilities.ghostscript or { }
utilities.ghostscript = ghostscript
local report_gs = logs.reporter("swiglib ghostscript")
local gs = swiglib("ghostscript.core")
local helpers = swiglib("helpers.core")
if gs then
report_gs("library loaded")
-- inspect(table.sortedkeys(gs))
else
return
end
-- these could be generic helpers
local function luatable_to_c_array(t)
local gsargv = helpers.new_char_p_array(#t)
for i=1,#t do
helpers.char_p_array_setitem(gsargv,i-1,t[i])
end
return gsargv
end
-- the more abstract interface
local interface = { }
ghostscript.interface = interface
function interface.new()
local instance = helpers.new_void_p_p()
local result = gs.gsapi_new_instance(instance,nil)
local buffer = nil
local object = { }
local function reader(instance,str,len)
return 0
end
local function writer(instance,str,len)
if buffer then
str = buffer .. str
buffer = nil
end
if not string.find(str,"[\n\r]$") then
str, buffer = string.match(str,"(.-)([^\n\r]+)$")
end
local log = object.log
for s in string.gmatch(str,"[^\n\r]+") do
insert(log,s)
report_gs(s)
end
return len
end
if result < 0 then
return nil
else
local job = helpers.void_p_p_value(instance)
gs.gsapi_set_stdio_callback(job,reader,writer,writer) -- could be option
object.instance = instance
object.job = job
object.result = 0
object.log = { }
return object
end
end
function interface.dispose(run)
if run.job then
gs.gsapi_delete_instance(run.job)
run.job = nil
end
if run.instance then
helpers.delete_void_p_p(run.instance)
run.instance = nil
end
end
function interface.init(run,options)
if run.job then
if not options then
options = { "ps2pdf" }
else
insert(options,1,"ps2pdf") -- a dummy
end
run.log = { }
local ct = luatable_to_c_array(options)
local result = gs.gsapi_init_with_args(run.job,#options,ct)
helpers.delete_char_p_array(ct)
run.initresult = result
return result >= 0
end
end
function interface.exit(run)
if run.job then
local result = gs.gsapi_exit(run.job)
if run.initresult == 0 or run.initresult == gs.e_Quit then
run.result = result
end
run.exitresult = result
return run.result >= 0
end
end
function interface.process(run,options)
interface.init(run,options)
return interface.exit(run)
end
-- end of more abstract interface
local nofruns = 0
function ghostscript.convert(specification)
--
nofruns = nofruns + 1
statistics.starttiming(ghostscript)
--
local inputname = specification.inputname
if not inputname or inputname == "" then
report_gs("invalid run %s, no inputname specified",nofruns)
statistics.stoptiming(ghostscript)
return false
end
local outputname = specification.outputname
if not outputname or outputname == "" then
outputname = file.replacesuffix(inputname,"pdf")
end
--
if not lfs.isfile(inputname) then
report_gs("invalid run %s, input file %a is not found",nofruns,inputname)
statistics.stoptiming(ghostscript)
return false
end
--
local device = specification.device
if not device or device == "" then
device = "pdfwrite"
end
--
local code = specification.code
if not code or code == "" then
code = ".setpdfwrite"
end
--
local run = interface.new()
if gsinstance then
report_gs("invalid run %s, initialization error",nofruns)
statistics.stoptiming(ghostscript)
return false
end
--
local options = specification.options or { }
--
insert(options,"-dNOPAUSE")
insert(options,"-dBATCH")
insert(options,"-dSAFER")
insert(options,formatters["-sDEVICE=%s"](device))
insert(options,formatters["-sOutputFile=%s"](outputname))
insert(options,"-c")
insert(options,code)
insert(options,"-f")
insert(options,inputname)
--
report_gs("run %s, input file %a, outputfile %a",nofruns,inputname,outputname)
report_gs("")
local okay = interface.process(run,options)
report_gs("")
--
interface.dispose(run)
--
statistics.stoptiming(ghostscript)
if okay then
return outputname
else
report_gs("run %s quit with errors",nofruns)
return false
end
end
function ghostscript.statistics(report)
local runtime = statistics.elapsedtime(ghostscript)
if report then
report_gs("nofruns %s, runtime %s",nofruns,runtime)
else
return {
runtime = runtime,
nofruns = nofruns,
}
end
end
-- for i=1,100 do
-- ghostscript.convert { inputname = "temp.eps" }
-- ghostscript.convert { inputname = "t:/escrito/tiger.eps" }
-- end
-- ghostscript.statistics(true)
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