plebeia

Functional storage using Merkle Patricia tree
package plebeia
Legend:
Library
Module
Module type
Parameter
Class
Class type
Library plebeia
Module Plebeia . Fs_tree . Make . Op
type 'a t = tree -> ( tree * 'a, Error.t ) Stdlib.result

Monad for synchronous file system operations

include Monad.S1 with type 'a t := 'a t
val return : 'a -> 'a t
val bind : 'a t -> ( 'a -> 'b t ) -> 'b t
val map : ( 'a -> 'b ) -> 'a t -> 'b t
val mapM : ( 'a -> 'b t ) -> 'a list -> 'b list t
val mapM_ : ( 'a -> unit t ) -> 'a list -> unit t
val iterM : ( 'a -> unit t ) -> 'a list -> unit t

alias of mapM_

val fold_leftM : ( 'a -> 'b -> 'a t ) -> 'a -> 'b list -> 'a t
val parseM : ( 'a -> 'b list -> ('a * 'b list) t ) -> 'a -> 'b list -> 'a t
module Infix : sig ... end
module Syntax : sig ... end
val lift_result : ( 'a, Error.t ) Stdlib.result -> 'a t
val check_tree_invariant : unit t

For debugging. Check the invariant of the current tree.

val fail : error -> 'a t

Fail with the given error

val raw_cursor : raw_cursor t

Get the current underlying raw cursor

val copy : Path.t -> Path.t -> unit t

copy src dst sets the tree at src to dst. dst must not be empty.

val cat : Path.t -> Value.t t

Regular file read access.

val write : Path.t -> Value.t -> unit t

Create or update a regular file. Directories are created if necessary. The path must not be empty.

val rm : ?recursive:bool -> ?ignore_error:bool -> Path.t -> bool t

Remove a regular file or a directory. The path must not be empty.

recursive=false : fails when the target is a directory recursive=true : removes the target recursively if it is a directory ignore_error=false : fails when the target does not exist ignore_error=true : does not fail even if the target does not exist

Returns true if the target is really removed. Returns false if the target does not exist.

val rmdir : ?ignore_error:bool -> Path.t -> bool t

Recursive removal of a directory. The path must not be empty.

ignore_error=false : fails when the target does not exist ignore_error=true : does not fail even if the target does not exist

Returns true if the target is really removed. Returns false if the target does not exist.

val compute_hash : Path.t -> hash t

Compute the Merkle hash of the tree specified by the path

val may_forget : Path.t -> unit t

Clear the memory cache of the tree under the current tree, if it is already persisted on the disk.

val get_tree : Path.t -> (tree * view) t

Get the subtree of the specified path. It also returns the view of the subtree.

val set_tree : Path.t -> tree -> unit t

Set the tree at the specified path

val cursor : cursor t

Get the cursor for `Fs` module

val run : tree -> 'a t -> ( tree * 'a, Error.t ) Stdlib.result

Monad runner

val do_then : ( tree -> unit ) -> 'a t -> 'a t

For debugging. do_then f op executes f against the current tree, then performs op.