This package contains Pluto's dependency sorting algorithm. Given a list of cell codes, PlutoDependencyExplorer can tell you in which order these cells should run. For example:

julia> import PlutoDependencyExplorer as PDE

julia> struct SimpleCell <: PDE.AbstractCell
           code
       end

julia> notebook = SimpleCell.([
           "x + y"
           "x = 1"
           "y = x + 2"
       ]);

julia> empty_topology = PDE.NotebookTopology{SimpleCell}();

julia> topology = PDE.updated_topology(
           empty_topology,
           notebook, notebook;
           get_code_str = c -> c.code,
           get_code_expr = c -> Meta.parse(c.code),
       );

julia> order = PDE.topological_order(topology);

julia> order.runnable
3-element Vector{SimpleCell}:
 SimpleCell("x = 1")
 SimpleCell("y = x + 2")
 SimpleCell("x + y")

PlutoDependencyExplorer.jl uses the low-level package ExpressionExplorer.jl to find the assignments and references of each cell. PlutoDependencyExplorer uses this information to build a dependency graph between cells (i.e. a NotebookTopology), which can be used to find the order to run them in (a TopologicalOrder).

If you are interested in ordering a list of expressions in execution order (the order that Pluto runs cells in), then use PlutoDependencyExplorer.jl. If you just want to know which variables are assigned or referenced in a single expression, use ExpressionExplorer.jl.

Take a look at the Documentation →

To work on this package, clone both the Pluto.jl and PlutoDependencyExplorer.jl repositories to your local drive. Then:

1. In your global environment (or another one), develop the Pluto and PlutoDependencyExplorer packages: (@1.10) pkg> dev ~/Documents/Pluto.jl (@1.10) pkg> dev ~/Documents/PlutoDependencyExplorer.jl
2. You can (@1.10) pkg> test PlutoDependencyExplorer to run the tests
3. You can also run Pluto, or (@1.10) pkg> test Pluto, and it will use your local copy of PlutoDependencyExplorer. This lets you test how your changes to PlutoDependencyExplorer integrate into Pluto.

If you are working on a change to PlutoDependencyExplorer that requires a matching change in Pluto, then you open a branch/PR on both repositories.

We need to tell PlutoDependencyExplorer which version of Pluto to use. To do this, edit the file PlutoDependencyExplorer.jl/test/pluto integration/DEV EDIT ME pluto pkg source.jl.