Add localdb.lua

localdb.lua

@@ -0,0 +1,86 @@
+local db = {}
+local file = fs.open("data.db","r+")
+if not file then error("failed to open db file") end
+
+local function readTable()
+    file.seek("set")
+    return textutils.unserialise(file.readAll() or "{}") or {}
+end
+
+local function writeTable(t)
+    file.seek("set")
+    file.write(textutils.serialise(t))
+    file.flush()
+end
+
+---returns a list of all materials
+---@return string[]
+function db.getMaterials()
+    local table = readTable()
+    local materials = {}
+    for k,_ in pairs(table.materials or {}) do
+        materials[#materials+1] = k
+    end
+    return materials
+end
+
+---gets the price of a material
+---@param mat string
+---@return number
+function db.getPrice(mat)
+    return (readTable().materials or {})[mat]
+end
+
+---returns a list of all currencies
+---@return string[]
+function db.getCurrencies()
+    local table = readTable()
+    local currencies = {}
+    for k,_ in pairs(table.currencies or {}) do
+        currencies[#currencies+1] = k
+    end
+    return currencies
+end
+
+---gets the worth of a currency
+---@param cur string
+---@return number
+function db.getCurrencyWorth(cur)
+    return (readTable().currencies or {})[cur]
+end
+
+---sets the price of a material
+---@param mat string
+---@param price number
+function db.setPrice(mat,price)
+    local table = readTable()
+    if not table.materials then table.materials = {} end
+    table.materials[mat] = price
+    writeTable(table)
+end
+
+---sets the worth of a currency
+---@param cur string
+---@param worth number
+function db.setWorth(cur,worth)
+    local table = readTable()
+    if not table.currencies then table.currencies = {} end
+    table.currencies[cur] = worth
+    writeTable(table)
+end
+
+---gets the currency unit string
+---@return string
+function db.getCurrencyUnit()
+    return readTable().currency_unit or "cr"
+end
+
+---sets the currency unit string
+---@param unit string
+function db.setCurrencyUnit(unit)
+    local table = readTable()
+    table.currency_unit = unit
+    writeTable(table)
+end
+
+return db