src/Gargantext/Database/Bashql.hs

   1 {-# OPTIONS_GHC -fno-warn-unused-top-binds #-}
   2 {-|
   3 Module      : Gargantext.Database.Bashql
   4 Description : BASHQL to deal with Gargantext Database.
   5 Copyright   : (c) CNRS, 2017-Present
   6 License     : AGPL + CECILL v3
   7 Maintainer  : team@gargantext.org
   8 Stability   : experimental
   9 Portability : POSIX
  10
  11 * BASHQL is a Domain Specific Language to deal with the Database
  12
  13 * BASHQL = functional (Bash * SQL)
  14
  15 * Which language to chose when working with a database ? To make it
  16 simple, instead of all common Object Relational Mapping (ORM) [1]
  17 strategy used nowadays inspired more by object logic than functional
  18 logic, the semantics of BASHQL with focus on the function first.
  19
  20 * BASHQL focus on the function, i.e. use bash language function name,
  21 and make it with SQL behind the scene. Then BASHQL is inspired more
  22 by Bash language [2] than SQL and then follows its main commands as
  23 specification and documentation.
  24
  25 * Main arguments:
  26   1. Theoritical: database and FileSystems are each thought as a single
  27   category, assumption based on theoretical work on databases by David Spivak [0].
  28   2. Practical argument: basic bash commands are a daily practice among
  29   developper community.
  30
  31 * How to help ?
  32   1. Choose a command you like in Bash
  33   2. Implement it in Haskell-SQL according to Gargantext Shema (Tree like
  34   filesystem)
  35   3. Translate it in BASHQL (follow previous implementations)
  36   4. Make a pull request    (enjoy the community)
  37
  38 * Implementation strategy: Functional adapations are made to the
  39 gargantext languages options and SQL optimization are done continuously
  40 during the project. For the Haskellish part, you may be inspired by
  41 Turtle implementation written by Gabriel Gonzales [3] which shows how to
  42 write Haskell bash translations.
  43
  44 * Semantics
  45 - FileSystem is now a NodeSystem where each File is a Node in a Directed Graph (DG).
  46
  47 * References
  48
  49 [0] MIT Press has published "Category theory for the sciences". The book
  50 can also be purchased on Amazon. Here are reviews by the MAA, by the
  51 AMS, and by SIAM.
  52
  53 [1] https://en.wikipedia.org/wiki/Object-relational_mapping
  54
  55 [2] https://en.wikipedia.org/wiki/Bash_(Unix_shell)
  56
  57 [3] https://github.com/Gabriel439/Haskell-Turtle-Library
  58
  59 TODO-ACCESS: should the checks be done here or before.
  60
  61 -}
  62
  63 {-# LANGUAGE NoImplicitPrelude #-}
  64 {-# LANGUAGE FlexibleContexts  #-}
  65 {-# LANGUAGE RankNTypes        #-}
  66
  67 module Gargantext.Database.Bashql () {-( get
  68                                   , ls
  69                                   , home
  70                                   , post
  71                                   , del
  72                                   , mv
  73                                   , put
  74                                   , rename
  75                                   , tree
  76                                   -- , mkCorpus, mkAnnuaire
  77                                  )-}
  78     where
  79
  80 import Control.Monad.Reader -- (Reader, ask)
  81
  82 import Data.Text (Text)
  83 import Data.List (concat, last)
  84
  85 import Gargantext.Core.Types
  86 import Gargantext.Database.Utils (runOpaQuery, Cmd)
  87 import Gargantext.Database.Schema.Node
  88 import qualified Gargantext.Database.Node.Update as U (Update(..), update)
  89 import Gargantext.Prelude
  90
  91
  92 -- List of NodeId
  93 -- type PWD a = PWD UserId [a]
  94 type PWD = [NodeId]
  95 --data PWD' a = a | PWD' [a]
  96
  97 rename :: NodeId -> Text -> Cmd err [Int]
  98 rename n t = U.update $ U.Rename n t
  99
 100 mv :: NodeId -> ParentId -> Cmd err [Int]
 101 mv n p = U.update $ U.Move n p
 102
 103 -- | TODO get Children or Node
 104 get :: PWD -> Cmd err [Node HyperdataAny]
 105 get []  = pure []
 106 get pwd = runOpaQuery $ selectNodesWithParentID (last pwd)
 107
 108 -- | Home, need to filter with UserId
 109 {-
 110 home :: Cmd err PWD
 111 home = map _node_id <$> getNodesWithParentId 0 Nothing
 112 -}
 113
 114 -- | ls == get Children
 115 ls :: PWD -> Cmd err [Node HyperdataAny]
 116 ls = get
 117
 118 tree :: PWD -> Cmd err [Node HyperdataAny]
 119 tree p = do
 120   ns       <- get p
 121   children <- mapM (\n -> get [_node_id n]) ns
 122   pure $ ns <> concat children
 123
 124 -- | TODO
 125 post :: PWD -> [NodeWrite] -> Cmd err Int64
 126 post [] _   = pure 0
 127 post _ []   = pure 0
 128 post pth ns = insertNodesWithParent (Just $ last pth) ns
 129
 130 --postR :: PWD -> [NodeWrite'] -> Cmd err [Int]
 131 --postR [] _ _ = pure [0]
 132 --postR _ [] _ = pure [0]
 133 --postR pth ns c = mkNodeR (last pth) ns c
 134
 135 -- | WIP
 136 -- rm : mv to trash
 137 -- del : empty trash
 138 --rm :: PWD -> [NodeId] -> IO Int
 139 --rm = del
 140 del :: [NodeId] -> Cmd err Int
 141 del [] = pure 0
 142 del ns = deleteNodes ns
 143
 144 -- | TODO
 145 put :: U.Update -> Cmd err [Int]
 146 put = U.update
 147
 148 -- | TODO
 149 -- cd (Home UserId) | (Node NodeId)
 150 -- cd Path
 151 -- jump NodeId
 152 -- touch Dir
 153
 154 -- type Name = Text
 155