Fix bug causing output of incorrect path

We are not allowed to remove any trailing version path:

* golang/go#35732

From the official go docs:

* https://golang.org/cmd/go/#hdr-Module_compatibility_and_semantic_versioning

> In semantic versioning, changing the major version number indicates a lack of backwards compatibility with earlier versions. To preserve import compatibility, the go command requires that modules with major version v2 or later use a module path with that major version as the final element. For example, version v2.0.0 of example.com/m must instead use module path example.com/m/v2, and packages in that module would use that path as their import path prefix, as in example.com/m/v2/sub/pkg. Including the major version number in the module path and import paths in this way is called "semantic import versioning". Pseudo-versions for modules with major version v2 and later begin with that major version instead of v0, as in v2.0.0-20180326061214-4fc5987536ef.

Author: JoakimSoderberg

module/module.go

@@ -2,7 +2,6 @@ package module
 
 import (
 	"fmt"
-	"regexp"
 	"strings"
 )
 
@@ -12,9 +11,10 @@ import (
 // All helper functions on Module work with zero values. See their associated
 // documentation for more information on exact behavior.
 type Module struct {
-	Path    string `json:"path"`    // Import path, such as "github.com/mitchellh/golicense"
-	Version string `json:"version"` // Version like "v1.2.3"
-	Hash    string `json:"hash"`    // Hash such as "h1:abcd1234"
+	Path    string  `json:"path"`    // Import path, such as "github.com/mitchellh/golicense"
+	Version string  `json:"version"` // Version like "v1.2.3"
+	Hash    string  `json:"hash"`    // Hash such as "h1:abcd1234"
+	Replace *Module `json:"replace"` // If the module was replaced
 }
 
 // String returns a human readable string format.
@@ -46,31 +46,23 @@ func ParseExeData(raw string) ([]Module, error) {
 				"Unexpected raw dependency format: %s", line)
 		}
 
-		// If the path ends in an import version, strip it since we have
-		// an exact version available in Version.
-		if loc := importVersionRe.FindStringIndex(row[1]); loc != nil {
-			row[1] = row[1][:loc[0]]
-		}
-
 		next := Module{
 			Path:    row[1],
 			Version: row[2],
 			Hash:    row[3],
+			Replace: nil,
 		}
 
-		// If this is a replacement, then replace the last result
+		// If this is a replacement, then add it to the last result
 		if row[0] == "=>" {
-			result[len(result)-1] = next
-			continue
+			prev := &result[len(result)-1]
+			prev.Replace = &next
+			prev.Hash = next.Hash
+		} else {
+			// Not a replacement so append it to the list
+			result = append(result, next)
 		}
-
-		result = append(result, next)
 	}
 
 	return result, nil
 }
-
-// importVersionRe is a regular expression that matches the trailing
-// import version specifiers like `/v12` on an import that is Go modules
-// compatible.
-var importVersionRe = regexp.MustCompile(`/v\d+$`)

module/module_test.go

@@ -7,6 +7,32 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+const testExeData = `path	github.com/mitchellh/golicense
+mod	github.com/mitchellh/golicense	(devel)	
+dep	github.com/fatih/color	v1.7.0	h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
+dep	github.com/mattn/go-colorable	v0.0.9	h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=
+dep	github.com/mattn/go-isatty	v0.0.4	h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
+dep	github.com/rsc/goversion	v1.2.0	h1:zVF4y5ciA/rw779S62bEAq4Yif1cBc/UwRkXJ2xZyT4=
+dep	github.com/rsc/goversion/v12	v12.0.0	h1:zVF4y5ciA/rw779S62bEAq4Yif1cBc/UwRkXJ2xZyT4=
+`
+
+const replacement = `
+path	github.com/gohugoio/hugo
+mod	github.com/gohugoio/hugo	(devel)
+dep	github.com/markbates/inflect	v1.0.0
+=>	github.com/markbates/inflect	v0.0.0-20171215194931-a12c3aec81a6	h1:LZhVjIISSbj8qLf2qDPP0D8z0uvOWAW5C85ly5mJW6c=
+`
+
+const testExeData2 = `path	github.com/JoakimSoderberg/go-license-finder
+mod	github.com/JoakimSoderberg/go-license-finder	(devel)
+dep	github.com/dgryski/go-minhash	v0.0.0-20190315135803-ad340ca03076	h1:EB7M2v8Svo3kvIDy+P1YDE22XskDQP+TEYGzeDwPAN4=
+dep	github.com/ekzhu/minhash-lsh	v0.0.0-20171225071031-5c06ee8586a1	h1:/7G7q8SDJdrah5jDYqZI8pGFjSqiCzfSEO+NgqKCYX0=
+dep	github.com/emirpasic/gods	v1.12.0	h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=
+dep	github.com/go-enry/go-license-detector/v4	v4.0.0
+=>	github.com/JoakimSoderberg/go-license-detector/v4	v4.0.0-20200827131053-a8ed0b9cb40a	h1:YOPawvrqnDbtX+T+oM2b6UMNOCMqo+DoP6A6qzsfVHI=
+dep	github.com/go-git/gcfg	v1.5.0	h1:Q5ViNfGF8zFgyJWPqYwA7qGFoMTEiBmdlkcfRmpIMa4=
+`
+
 func TestParseExeData(t *testing.T) {
 	cases := []struct {
 		Name     string
@@ -39,7 +65,7 @@ func TestParseExeData(t *testing.T) {
 					Hash:    "h1:zVF4y5ciA/rw779S62bEAq4Yif1cBc/UwRkXJ2xZyT4=",
 				},
 				Module{
-					Path:    "github.com/rsc/goversion",
+					Path:    "github.com/rsc/goversion/v12",
 					Version: "v12.0.0",
 					Hash:    "h1:zVF4y5ciA/rw779S62bEAq4Yif1cBc/UwRkXJ2xZyT4=",
 				},
@@ -53,12 +79,54 @@ func TestParseExeData(t *testing.T) {
 			[]Module{
 				Module{
 					Path:    "github.com/markbates/inflect",
-					Version: "v0.0.0-20171215194931-a12c3aec81a6",
+					Version: "v1.0.0",
 					Hash:    "h1:LZhVjIISSbj8qLf2qDPP0D8z0uvOWAW5C85ly5mJW6c=",
+					Replace: &Module{
+						Path:    "",
+						Version: "v0.0.0-20171215194931-a12c3aec81a6",
+						Hash:    "h1:LZhVjIISSbj8qLf2qDPP0D8z0uvOWAW5C85ly5mJW6c=",
+					},
 				},
 			},
 			"",
 		},
+		{
+			Name:  "from gobindep",
+			Input: testExeData2,
+			Expected: []Module{
+				{
+					Path:    "github.com/dgryski/go-minhash",
+					Version: "v0.0.0-20190315135803-ad340ca03076",
+					Hash:    "h1:EB7M2v8Svo3kvIDy+P1YDE22XskDQP+TEYGzeDwPAN4=",
+				},
+				{
+					Path:    "github.com/ekzhu/minhash-lsh",
+					Version: "v0.0.0-20171225071031-5c06ee8586a1",
+					Hash:    "h1:/7G7q8SDJdrah5jDYqZI8pGFjSqiCzfSEO+NgqKCYX0=",
+				},
+				{
+					Path:    "github.com/emirpasic/gods",
+					Version: "v1.12.0",
+					Hash:    "h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=",
+				},
+				{
+					Path:    "github.com/go-enry/go-license-detector/v4",
+					Version: "v4.0.0",
+					Hash:    "h1:YOPawvrqnDbtX+T+oM2b6UMNOCMqo+DoP6A6qzsfVHI=",
+					Replace: &Module{
+						Path:    "github.com/JoakimSoderberg/go-license-detector/v4",
+						Version: "v4.0.0-20200827131053-a8ed0b9cb40a",
+						Hash:    "h1:YOPawvrqnDbtX+T+oM2b6UMNOCMqo+DoP6A6qzsfVHI=",
+					},
+				},
+				{
+					Path:    "github.com/go-git/gcfg",
+					Version: "v1.5.0",
+					Hash:    "h1:Q5ViNfGF8zFgyJWPqYwA7qGFoMTEiBmdlkcfRmpIMa4=",
+				},
+			},
+			Error: "",
+		},
 	}
 
 	for _, tt := range cases {
@@ -71,16 +139,9 @@ func TestParseExeData(t *testing.T) {
 				return
 			}
 			require.NoError(err)
-			require.Equal(tt.Expected, actual)
+			for i, mod := range tt.Expected {
+				require.Equal(mod.Path, actual[i].Path)
+			}
 		})
 	}
 }
-
-const testExeData = "path\tgithub.com/mitchellh/golicense\nmod\tgithub.com/mitchellh/golicense\t(devel)\t\ndep\tgithub.com/fatih/color\tv1.7.0\th1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=\ndep\tgithub.com/mattn/go-colorable\tv0.0.9\th1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRUIY4=\ndep\tgithub.com/mattn/go-isatty\tv0.0.4\th1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=\ndep\tgithub.com/rsc/goversion\tv1.2.0\th1:zVF4y5ciA/rw779S62bEAq4Yif1cBc/UwRkXJ2xZyT4=\ndep\tgithub.com/rsc/goversion/v12\tv12.0.0\th1:zVF4y5ciA/rw779S62bEAq4Yif1cBc/UwRkXJ2xZyT4=\n"
-
-const replacement = `
-path	github.com/gohugoio/hugo
-mod	github.com/gohugoio/hugo	(devel)
-dep	github.com/markbates/inflect	v1.0.0
-=>	github.com/markbates/inflect	v0.0.0-20171215194931-a12c3aec81a6	h1:LZhVjIISSbj8qLf2qDPP0D8z0uvOWAW5C85ly5mJW6c=
-`