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Tools Bringing Happiness
- 2. Code Inspection Tools • gotype • errcheck • go vet • golint • defercheck, structcheck, varcheck
- 3. gotype https://godoc.org/golang.org/x/tools/cmd/gotype “syntactic and semantic analysis of Go files and packages like the front-end of a Go compiler” go get golang.org/x/tools/cmd/gotype
- 8. errcheck https://github.com/kisielk/errcheck “Errcheck is a program for checking for unchecked errors in go programs” go get github.com/kisielk/errcheck
- 10. go vet http://godoc.org/golang.org/x/tools/cmd/vet “reports suspicious constructs” go get golang.org/x/tools/cmd/vet • Suspicious calls to functions in the Printf family • Locks that are erroneously passed by value • Unreachable code • Shadowed variables ...
- 11. Comparisons between functions and nil go vet
- 12. comparison of function useless != nil is always true Comparisons between functions and nil go vet
- 14. golint https://github.com/golang/lint “Golint makes suggestions for many of the mechanically checkable items listed in Effective Go and the CodeReviewComments wiki page.” go get github.com/golang/lint/golint
- 15. golint should replace x += 1 with x++ x++ and x--
- 16. golint • error var SomeErr should have name of the form ErrFoo • exported var SomeErr should have comment or be unexported global error vars & doc comments
- 17. defercheck, structcheck, varcheck https://github.com/opennota/check • defercheck Find repeating defers • structcheck Find unused struct fields • varcheck Find unused global variables and constants go get github.com/opennota/check/cmd/...
- 23. Code Comprehension Tools • godoc -analysis https://golang.org/lib/godoc/analysis/help.html • oracle http://golang.org/s/oracle-user-manual https://github.com/fzipp/pythia
- 24. godoc -analysis https://golang.org/lib/godoc/analysis/help.html $ godoc -http=:6060 -analysis=type,pointer
- 25. godoc -analysis https://golang.org/lib/godoc/analysis/help.html $ godoc -http=:6060 -analysis=type,pointer
- 26. godoc -analysis https://golang.org/lib/godoc/analysis/help.html $ godoc -http=:6060 -analysis=type,pointer
- 27. godoc -analysis https://golang.org/lib/godoc/analysis/help.html $ godoc -http=:6060 -analysis=type,pointer
- 28. godoc -analysis https://golang.org/lib/godoc/analysis/help.html $ godoc -http=:6060 -analysis=type,pointer
- 29. godoc -analysis https://golang.org/lib/godoc/analysis/help.html $ godoc -http=:6060 -analysis=type,pointer
- 30. oracle http://golang.org/s/oracle-user-manual go get golang.org/x/tools/cmd/oracle $ oracle -pos='./src/github.com/boltdb/bolt/tx.go:#1630' -format=plain callers github.com/boltdb/bolt ./src/github.com/boltdb/bolt/tx.go:66:15: (*github.com/boltdb/bolt.Tx). Size is called from these 1 sites: ./src/github.com/boltdb/bolt/tx.go:285:35: static method call from (*github.com/boltdb/bolt.Tx).WriteTo
- 31. oracle + pythia https://github.com/fzipp/pythia $ pythia -v github.com/boltdb/bolt/cmd/bolt github.com/boltdb/bolt go get github.com/fzipp/pythia
- 37. Refactoring Tools • gorename • gofmt -r • ed
- 38. gorename https://godoc.org/golang.org/x/tools/cmd/gorename “The gorename command performs precise type-safe renaming of identifiers in Go source code.” go get golang.org/x/tools/cmd/oracle
- 39. $ gorename -v -from='"demo".handler' -to='rootHandler'❚
- 40. $ gorename -v -from='"demo".handler' -to='rootHandler' Renamed 2 occurrences in 1 file in 1 package. $ ❚
- 41. gofmt -r https://golang.org/cmd/gofmt/ “Apply the rewrite rule to the source before reformatting”
- 42. $ gofmt -w -r 'x.Write([]byte(y)) -> x.Write([]byte(strings.ToLower (y)))' src/demo/main.go ❚
- 43. $ gofmt -w -r 'x.Write([]byte(y)) -> x.Write([]byte(strings.ToLower (y)))' src/demo/main.go $ ❚
- 44. $ gofmt -w -r 'http.ListenAndServe(x, y) -> http.ListenAndServe(x, y, "BAD THING")' src/demo/main.go ❚
- 45. $ gofmt -w -r 'http.ListenAndServe(x, y) -> http.ListenAndServe(x, y, "BAD THING")' src/demo/main.go $ ❚
- 46. eg “Example-based refactoring of expressions...” go get golang.org/x/tools/cmd/eg
- 47. 1
- 48. 2
- 49. 3
- 50. 5 $ eg -w -t eg-template.go demo ❚
- 51. 6 $ eg -w -t eg-template.go demo === eg/src/demo/demo.go (1 matches) $ ❚
- 52. 7 $ eg -w -t eg-template.go demo === eg/src/demo/demo.go (1 matches) $ gorename -from='"demo".NewPoint' -to='NewPoint__OLD__' ❚
- 53. 8 $ eg -w -t eg-template.go demo === eg/src/demo/demo.go (1 matches) $ gorename -from='"demo".NewPoint' -to='NewPoint__OLD__' $ ❚
- 54. 9 $ eg -w -t eg-template.go demo === eg/src/demo/demo.go (1 matches) $ gorename -from='"demo".NewPoint' -to='NewPoint__OLD__' $ gorename -from='"demo".NewPoint__NEW__' -to='NewPoint' ❚
- 55. 10 $ eg -w -t eg-template.go demo === eg/src/demo/demo.go (1 matches) $ gorename -from='"demo".NewPoint' -to='NewPoint__OLD__' $ gorename -from='"demo".NewPoint__NEW__' -to='NewPoint' $ ❚
- 57. gocyclo https://github.com/fzipp/gocyclo “calculates cyclomatic complexities of functions” 1 is the base complexity of a function +1 for each 'if', 'for', 'case', '&&' or '||'
- 58. MOAR TOOLZ • https://godoc.org/golang.org/x/tools • https://github.com/golang/tools/tree/master/cmd • http://dominik.honnef.co/posts/2014/12/an_incomplete_list_of_go_tools/
- 59. package main import "fmt" func main() { contact := struct { name, email string }{ "Konstantin Cherkasov", "k.cherkasoff@gmail.com", } fmt.Println(contact) }