Beginned rewritting of whoison

- Beginned rewritting of whoison, using second-precise features

mods/whoison/functions.lua

@@ -0,0 +1,74 @@
+-- Functions
+--
+
+function whoison.functions.load(param)
+    --[[
+        Values for param :
+            * `E` : Everyone
+            * <name> : name
+    ]]--
+
+    if param == "E" then
+        for line in whoison.presence_file:lines() do
+            local datas = minetest.deserialize(line)
+            if not datas then
+                minetest.log("error", "[whoison] Cannot load line (" .. line ..
+                    ") : invalid line")
+                return false
+            end
+            return {[datas.name] = datas.time}
+        end
+        return table
+    elseif minetest.get_player_by_name(param) then
+        for line in whoison.presence_file:lines() do
+            local datas = minetest.deserialize(line)
+            if datas then
+                if datas.name == name then
+                    return datas.time
+                end
+            end
+        end
+        minetest.log("error", "[whoison] Cannot load datas for " .. param ..
+            " : player not registered")
+        return false
+    else
+        minetest.log("error", "[whoison] Cannot load datas for " .. param ..
+            " : not a player nor 'Everyone'")
+        return false
+    end
+end
+
+function whoison.functions.save(param)
+    --[[
+        Values for param :
+            * E : Everyone
+            * <name> : name
+    ]]--
+
+    if param == "E" then
+        -- TODO
+    else
+        for line in whoison.presence_file:lines() do
+            local datas = minetest.deserialize(line)
+            if datas then
+                if datas.name == name then
+                    -- Erase line
+                    local i = 0
+                    whoison.presence_file:seek(string.len(line),"cur")
+                    while i < string.len(line) do
+                        whoison.presence_file:write("\b")
+                        i = i + 1
+                    end
+                    whoison.presence_file:write(minetest.serialize(
+                        {name = param, time = whoison.datas[param]}
+                    ) .. "\n")
+                    return true
+                end
+            end
+        end
+        whoison.presence_file:write(minetest.serialize(
+            {name = param, time = whoison.datas[param]}
+        ) .. "\n")
+        return true
+    end
+end