gopkg.in/tools/godep.v60@v60.0.0-20160318205742-530caa84a45c/diff.go (about) 1 package main 2 3 import ( 4 "bytes" 5 "fmt" 6 "log" 7 8 "github.com/tools/godep/Godeps/_workspace/src/github.com/pmezard/go-difflib/difflib" 9 ) 10 11 var cmdDiff = &Command{ 12 Name: "diff", 13 Short: "shows the diff between current and previously saved set of dependencies", 14 Long: ` 15 Shows the difference, in a unified diff format, between the 16 current set of dependencies and those generated on a 17 previous 'go save' execution. 18 `, 19 Run: runDiff, 20 OnlyInGOPATH: true, 21 } 22 23 func runDiff(cmd *Command, args []string) { 24 gold, err := loadDefaultGodepsFile() 25 if err != nil { 26 log.Fatalln(err) 27 } 28 29 pkgs := []string{"."} 30 dot, err := LoadPackages(pkgs...) 31 if err != nil { 32 log.Fatalln(err) 33 } 34 35 gnew := &Godeps{ 36 ImportPath: dot[0].ImportPath, 37 GoVersion: gold.GoVersion, 38 } 39 40 err = gnew.fill(dot, dot[0].ImportPath) 41 if err != nil { 42 log.Fatalln(err) 43 } 44 45 diff, err := diffStr(&gold, gnew) 46 if err != nil { 47 log.Fatalln(err) 48 } 49 fmt.Println(diff) 50 } 51 52 // diffStr returns a unified diff string of two Godeps. 53 func diffStr(a, b *Godeps) (string, error) { 54 var ab, bb bytes.Buffer 55 56 _, err := a.writeTo(&ab) 57 if err != nil { 58 log.Fatalln(err) 59 } 60 61 _, err = b.writeTo(&bb) 62 if err != nil { 63 log.Fatalln(err) 64 } 65 66 diff := difflib.UnifiedDiff{ 67 A: difflib.SplitLines(ab.String()), 68 B: difflib.SplitLines(bb.String()), 69 FromFile: b.file(), 70 ToFile: "$GOPATH", 71 Context: 10, 72 } 73 return difflib.GetUnifiedDiffString(diff) 74 }