feat: add td diff command for semantic code change analysis#72
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feat: add td diff command for semantic code change analysis#72
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Parses unified git diffs and uses Go AST analysis to identify symbol-level changes (functions/types/methods/imports added/removed/modified). Supports --staged, --ref HEAD~N, --issue (diff since start snapshot), and --json. Fixes correctness bug from v1: new file content is now retrieved from the working tree (non-staged) or git index (staged) instead of always reading from HEAD, which gave wrong results for staged diffs and uncommitted changes. Nightshift-Task: semantic-diff Nightshift-Ref: https://github.com/marcus/nightshift Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
td diffcommand that parses unified git diffs and uses Go AST analysis to identify symbol-level changes (functions, types, methods, imports added/removed/modified)--staged,--ref HEAD~N,--issue(diff since issue start snapshot), and--jsonoutputgit show :pathfor staged) instead of always reading from HEAD, which gave wrong results for staged diffs and uncommitted changesArchitecture
internal/diff/parse.go— unified diff parser:FileDiff,Hunk,Parse()internal/diff/semantic.go— Go AST symbol extraction and comparison:AnalyzeGoFile()internal/diff/summarize.go— orchestrator: reads old/new content, runs AST analysis on.gofiles, file-level categories for non-Gointernal/git/git.go— new helpers:GetDiffContent,GetDiffContentStaged,GetFileAtRef,GetStagedFilecmd/diff.go— cobra command wiring with flagsTest plan
internal/diffunit tests: parser (add/delete/modify/rename/multi-file), AST analysis (functions, types, methods, imports, consts, vars)cmdtests: command registration, flag defaults, parse+summarize integrationgo test ./...passesNightshift-Task: semantic-diff
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