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feat(graph): add Root() helper method

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Add Root() method to TaskfileGraph to get the root vertex (entrypoint
Taskfile). This will be used for lazy variable resolution.

Note: Tasks already have Location.Taskfile which can be used to find
their source Taskfile in the graph, so GetVertexByNamespace is not
needed.
This commit is contained in:
Valentin Maerten
2025-12-26 21:00:02 +01:00
parent 9732f7e08b
commit da927ad5fe
1 changed files with 12 additions and 0 deletions
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12
taskfile/ast/graph.go
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@@ -45,6 +45,18 @@ func (tfg *TaskfileGraph) Visualize(filename string) error {
return draw.DOT(tfg.Graph, f)
}
// Root returns the root vertex of the graph (the entrypoint Taskfile).
func (tfg *TaskfileGraph) Root() (*TaskfileVertex, error) {
hashes, err := graph.TopologicalSort(tfg.Graph)
if err != nil {
return nil, err
}
if len(hashes) == 0 {
return nil, fmt.Errorf("task: graph has no vertices")
}
return tfg.Vertex(hashes[0])
}
func (tfg *TaskfileGraph) Merge() (*Taskfile, error) {
hashes, err := graph.TopologicalSort(tfg.Graph)
if err != nil {