added --goto page comamnd-line argument

reader.lua

@@ -35,16 +35,18 @@ KEY_BTN = 92
 -- option parsing:
 longopts = {
 	password = "p",
+	goto = "g",
 	gamma = "G",
 	device = "d",
 	help = "h"
 }
-optarg, optind = alt_getopt.get_opts(ARGV, "p:G:h", longopts)
+optarg, optind = alt_getopt.get_opts(ARGV, "p:G:hg:", longopts)
 if optarg["h"] or ARGV[optind] == nil then
 	print("usage: ./reader.lua [OPTION] ... DOCUMENT.PDF")
 	print("Read PDFs on your E-Ink reader")
 	print("")
 	print("-p, --password=PASSWORD   set password for reading PDF document")
+	print("-g, --goto=page           start reading on page")
 	print("-G, --gamma=GAMMA         set gamma correction")
 	print("                          (floating point notation, e.g. \"1.5\")")
 	print("-d, --device=DEVICE       set device specific configuration,")
@@ -213,6 +215,6 @@ function mainloop()
 	end
 end
 
-goto(1)
+goto(tonumber(optarg["g"]) or 1)
 
 mainloop()