bashdb

bashdb

#!/bin/bash

DBNAME=${DBNAME:-database}

help() {
  echo "A very lol key/value database written in bash.

usage: bashdb <command> <args>

  get <key>           Get a value from the database
  set <key> <value>   Set a value"
}

db_set() {
  touch $DBNAME
  local offset=$(( $(wc -c $DBNAME | tr -dc '0-9') + 1 ))
  echo "$1,$2" >> $DBNAME
  index_set $1 $offset
}

db_get() {
  # If a byte offset is found in the index, seek to it and return the value
  local offset=$(index_get "$1")
  if [ -n "$offset" ]; then
    echo $(tail -c +${offset} $DBNAME | get_value)
  else
    echo "Key not found" >&2
    exit 1
  fi
}

index_set() {
  echo "$1,$2" >> "${DBNAME}_index"
}

index_get() {
  echo $(grep "^$1," ${DBNAME}_index | get_value)
}

get_value() {
  # Using , as a delimiter, split the input on the first occurrence and output the rest
  IFS=',' read -r key value; echo $value
}


subcommand=$1

case $subcommand in
  "" | "-h" | "--help")
    help
    ;;
  *)
    shift
    db_${subcommand} "$@"
    if [ $? = 127 ]; then
      echo "Error: '$subcommand' is not a known subcommand." >&2
      exit 1
    fi
    ;;
esac