diff options
| -rw-r--r-- | tool/listpkgs/listpkgs.go | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/tool/listpkgs/listpkgs.go b/tool/listpkgs/listpkgs.go index 3cb4ab790..b29db94b1 100644 --- a/tool/listpkgs/listpkgs.go +++ b/tool/listpkgs/listpkgs.go @@ -31,6 +31,7 @@ var ( shard = flag.String("shard", "", "if non-empty, a string of the form 'N/M' to only print packages in shard N of M (e.g. '1/3', '2/3', '3/3/' for different thirds of the list)") affectedByTag = flag.String("affected-by-tag", "", "if non-empty, only list packages whose test binary would be affected by the presence or absence of this build tag") hasRootTests = flag.Bool("has-root-tests", false, "list packages (as ./relative/path) containing _test.go files that call tstest.RequireRoot") + hasGoGenerate = flag.Bool("has-go-generate", false, "only list packages that contain at least one //go:generate directive") ) func main() { @@ -121,6 +122,9 @@ Pkg: continue Pkg } } + if *hasGoGenerate && !pkgHasGoGenerate(pkg) { + continue Pkg + } matches++ if *shard != "" { @@ -291,6 +295,65 @@ func fileMentionsTag(filename, tag string) (bool, error) { return tags[tag], nil } +// pkgHasGoGenerate reports whether any source file in pkg contains a +// //go:generate directive. +func pkgHasGoGenerate(pkg *packages.Package) bool { + // Include IgnoredFiles so directives behind build constraints are still + // found; the caller can narrow by tag via -with-tags-all/-without-tags-any + // if they care. + all := slices.Concat(pkg.CompiledGoFiles, pkg.OtherFiles, pkg.IgnoredFiles) + for _, name := range all { + ok, err := fileHasGoGenerate(name) + if err != nil { + log.Printf("reading %s: %v", name, err) + continue + } + if ok { + return true + } + } + return false +} + +var ( + goGenerateMu sync.Mutex + goGenerate = map[string]bool{} // abs path -> whether file has //go:generate +) + +func fileHasGoGenerate(filename string) (bool, error) { + goGenerateMu.Lock() + v, ok := goGenerate[filename] + goGenerateMu.Unlock() + if ok { + return v, nil + } + + f, err := os.Open(filename) + if err != nil { + return false, err + } + defer f.Close() + + has := false + s := bufio.NewScanner(f) + for s.Scan() { + // go:generate directives must start at column 1 (no leading + // whitespace) to be recognized by the go tool. + if strings.HasPrefix(s.Text(), "//go:generate") { + has = true + break + } + } + if err := s.Err(); err != nil { + return false, fmt.Errorf("reading %s: %w", filename, err) + } + + goGenerateMu.Lock() + goGenerate[filename] = has + goGenerateMu.Unlock() + return has, nil +} + // printRootTestPkgs walks the current directory tree looking for _test.go // files that contain "tstest.RequireRoot" and prints the unique package // directories as ./relative/path. |