Don't assert() around io.popen() and use generic FileExists().

fileinfo.lua

@@ -35,10 +35,20 @@ function FileInfo:FormatSize(size)
 	end
 end
 
+function FileExists(path)
+	local f = io.open(path, "r")
+	if f then
+		f:close()
+		return true
+	else
+		return false
+	end
+end
+
 function getUnpackedZipSize(zipfile)
 	-- adding quotes allows us to avoid crash on zips which filename contains space(s)
 	local cmd='unzip -l \"'..zipfile..'\" | tail -1 | sed -e "s/^ *\\([0-9][0-9]*\\) *.*/\\1/"'
-	local p = assert(io.popen(cmd, "r"))
+	local p = io.popen(cmd, "r")
 	local res = assert(p:read("*a"))
 	p:close()
 	res = string.gsub(res, "[\n\r]+", "")
@@ -60,7 +70,7 @@ end
 
 function FileInfo:getFolderContent()
 	InfoMessage:show("Scanning folder...", 1)
-	local tmp = assert(io.popen('du -a \"'..self.pathfile..'\"', "r"))
+	local tmp = io.popen('du -a \"'..self.pathfile..'\"', "r")
 	local dirs, files, books, size, name, output, ftype, j = -1, 0, 0, 0
 	for output in tmp:lines() do
 		j = output:find("/")
@@ -136,8 +146,7 @@ function FileInfo:init(path, fname)
 	if fname then
 		-- if the document was already opened
 		local history = DocToHistory(self.pathfile)
-		local file, msg = io.open(history, "r")
-		if not file then 
+		if not FileExists(history) then
 			table.insert(self.result, {dir = "Last read", name = "Never"})
 		else
 			table.insert(self.result, {dir = "Last read", name = self:FileCreated(history, "change")})
@@ -161,7 +170,7 @@ end
 
 function FileInfo:show(path, name)
 	-- at first, one has to test whether the file still exists or not: necessary for last documents
-	if name and not io.open(path.."/"..name,"r") then return nil end
+	if name and not FileExists(path.."/"..name) then return nil end
 	-- then goto main functions
 	self:init(path,name)
 	-- local variables