feat(graph): code change impact graph with blast-radius queries (#30)#65
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Implements issue #30. Builds an in-memory directed dependency graph and answers blast-radius queries: given a set of changed files, which other files are transitively affected? - Graph: nodes (files/packages) + directed edges with weights - BlastRadius: BFS over reverse edges, returns affected nodes ranked by impact score (1.0 at depth 1, halved per level) - BuildFromGoFiles: walks a directory tree and extracts Go import edges using line-by-line parsing (no cgo/go/packages dependency) - Stats: node/edge counts, max in/out degree, top-5 hub nodes Co-authored-by: Ona <no-reply@ona.com>
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Closes #30
Summary
Adds
pkg/graph— an in-memory directed dependency graph that answers blast-radius queries: given a set of changed files, which other files are transitively affected?Features
Graph— nodes (files/packages/modules) + directed weighted edges, O(1) node lookup, O(degree) neighbour traversalBlastRadius— BFS over reverse edges from the changed set; returns affected nodes ranked by impact score with configurablemaxDepthBuildFromGoFiles— walks a directory tree and extracts Go import edges using line-by-line parsing (nogo/packages, no cgo)Stats— node/edge counts, max in/out degree, top-5 hub nodes by in-degreeImpact scoring
Nodes at depth 1 (direct dependents) score 1.0; each additional level halves the score. Results are sorted by score descending.
Files
pkg/graph/graph.go—Graph,Node,Edge,BlastRadius,Statspkg/graph/builder.go—BuildFromGoFiles,parseGoImportspkg/graph/graph_test.go— 13 tests