Tiny key value db in im. inspired by https://github.com/capocasa/limdb

tinydb.nim

import tables, strutils, os

type
  TinyDB* = object
    filename: string
    data: Table[string, string]

proc init*(filename: string): TinyDB =
  result.filename = filename
  result.data = initTable[string, string]()
  
  if fileExists(result.filename):
    for line in lines(result.filename):
      let parts = line.split('\t', 1)
      if parts.len == 2:
        result.data[parts[0]] = parts[1]

proc save(db: TinyDB) =
  let file = open(db.filename, fmWrite)
  defer: file.close()
  
  for key, value in db.data:
    file.writeLine(key & "\t" & value)

proc `[]=`*[T](db: var TinyDB, key: string, value: T) =
  db.data[key] = $value
  db.save()

proc `[]`*(db: TinyDB, key: string): string =
  db.data.getOrDefault(key)

when isMainModule:
  var db: TinyDB = init("my")
  db["foo"] = "bar"
  echo db["foo"]