internal: semver support for pseudoversions (#1564)

* support for prerelease tag / pseudoversion

* build version first

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>

* use strings.Cut

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>

---------

Co-authored-by: Daniel Weiße <66256922+daniel-weisse@users.noreply.github.com>

internal/semver/semver.go

@@ -23,6 +23,7 @@ type Semver struct {
 	Major      int
 	Minor      int
 	Patch      int
+	Prerelease string
 }
 
 // New returns a Version from a string.
@@ -39,6 +40,7 @@ func New(version string) (Semver, error) {
 	version = semver.Canonical(version)
 
 	var major, minor, patch int
+	_, pre, _ := strings.Cut(version, "-")
 	_, err := fmt.Sscanf(version, "v%d.%d.%d", &major, &minor, &patch)
 	if err != nil {
 		return Semver{}, fmt.Errorf("parsing semver parts: %w", err)
@@ -48,12 +50,17 @@ func New(version string) (Semver, error) {
 		Major:      major,
 		Minor:      minor,
 		Patch:      patch,
+		Prerelease: pre,
 	}, nil
 }
 
 // String returns the string representation of the version.
 func (v Semver) String() string {
-	return fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
+	version := fmt.Sprintf("v%d.%d.%d", v.Major, v.Minor, v.Patch)
+	if v.Prerelease != "" {
+		return fmt.Sprintf("%s-%s", version, v.Prerelease)
+	}
+	return version
 }
 
 // Compare compares two versions. It relies on the semver.Compare function internally.

internal/semver/semver_test.go

@@ -15,6 +15,8 @@ import (
 
 var (
 	v1_18_0         = Semver{Major: 1, Minor: 18, Patch: 0}
+	v1_18_0Pre      = Semver{Major: 1, Minor: 18, Patch: 0, Prerelease: "pre"}
+	v1_18_0PreExtra = Semver{Major: 1, Minor: 18, Patch: 0, Prerelease: "pre.1"}
 	v1_19_0         = Semver{Major: 1, Minor: 19, Patch: 0}
 	v1_18_1         = Semver{Major: 1, Minor: 18, Patch: 1}
 	v1_20_0         = Semver{Major: 1, Minor: 20, Patch: 0}
@@ -24,24 +26,69 @@ var (
 func TestNewVersion(t *testing.T) {
 	testCases := map[string]struct {
 		version string
+		want    Semver
 		wantErr bool
 	}{
-		"valid version":    {"v1.18.0", false},
-		"invalid version":  {"v1.18. 0", true},
-		"add prefix":       {"1.18.0", false},
-		"only major.minor": {"v1.18", false},
-		"only major":       {"v1", false},
+		"valid version": {
+			version: "v1.18.0",
+			want: Semver{
+				Major: 1,
+				Minor: 18,
+				Patch: 0,
+			},
+			wantErr: false,
+		},
+		"valid version prerelease": {
+			version: "v1.18.0-pre+yyyymmddhhmmss-abcdefabcdef",
+			want: Semver{
+				Major:      1,
+				Minor:      18,
+				Patch:      0,
+				Prerelease: "pre",
+			},
+			wantErr: false,
+		},
+		"only prerelease": {version: "v-pre.0.yyyymmddhhmmss-abcdefabcdef", wantErr: true},
+		"invalid version": {version: "v1.18. 0", wantErr: true},
+		"add prefix": {
+			version: "1.18.0",
+			want: Semver{
+				Major: 1,
+				Minor: 18,
+				Patch: 0,
+			},
+			wantErr: false,
+		},
+		"only major.minor": {
+			version: "v1.18",
+			want: Semver{
+				Major: 1,
+				Minor: 18,
+				Patch: 0,
+			},
+			wantErr: false,
+		},
+		"only major": {
+			version: "v1",
+			want: Semver{
+				Major: 1,
+				Minor: 0,
+				Patch: 0,
+			},
+			wantErr: false,
+		},
 	}
 
 	for name, tc := range testCases {
 		t.Run(name, func(t *testing.T) {
 			assert := assert.New(t)
 
-			_, err := New(tc.version)
+			ver, err := New(tc.version)
 			if tc.wantErr {
 				assert.Error(err)
 			} else {
 				assert.NoError(err)
+				assert.Equal(tc.want, ver)
 			}
 		})
 	}
@@ -57,6 +104,10 @@ func TestJSONMarshal(t *testing.T) {
 			version:    v1_18_0,
 			wantString: `"v1.18.0"`,
 		},
+		"prerelease": {
+			version:    v1_18_0Pre,
+			wantString: `"v1.18.0-pre"`,
+		},
 	}
 
 	for name, tc := range testCases {
@@ -89,6 +140,10 @@ func TestJSONUnmarshal(t *testing.T) {
 			version: `"v1. 18.0"`,
 			wantErr: true,
 		},
+		"prerelease": {
+			version:    `"v1.18.0-pre"`,
+			wantString: "v1.18.0-pre",
+		},
 	}
 
 	for name, tc := range testCases {
@@ -129,6 +184,26 @@ func TestComparison(t *testing.T) {
 			version2: v1_18_0,
 			want:     1,
 		},
+		"prerelease less than": {
+			version1: v1_18_0Pre,
+			version2: v1_18_0,
+			want:     -1,
+		},
+		"prerelease greater than": {
+			version1: v1_18_0,
+			version2: v1_18_0Pre,
+			want:     1,
+		},
+		"prerelease equal": {
+			version1: v1_18_0Pre,
+			version2: v1_18_0Pre,
+			want:     0,
+		},
+		"prerelease extra less than": {
+			version1: v1_18_0Pre,
+			version2: v1_18_0PreExtra,
+			want:     -1,
+		},
 	}
 
 	for name, tc := range testCases {
@@ -176,6 +251,26 @@ func TestCanUpgrade(t *testing.T) {
 			version2: v1_18_0,
 			want:     false,
 		},
+		"prerelease less than": {
+			version1: v1_18_0Pre,
+			version2: v1_18_0,
+			want:     true,
+		},
+		"prerelease greater than": {
+			version1: v1_18_0,
+			version2: v1_18_0Pre,
+			want:     false,
+		},
+		"prerelease equal": {
+			version1: v1_18_0Pre,
+			version2: v1_18_0Pre,
+			want:     false,
+		},
+		"prerelease extra": {
+			version1: v1_18_0Pre,
+			version2: v1_18_0PreExtra,
+			want:     true,
+		},
 	}
 
 	for name, tc := range testCases {
@@ -196,6 +291,10 @@ func TestNextMinor(t *testing.T) {
 			version: v1_18_0,
 			want:    "v1.19",
 		},
+		"prerelease": {
+			version: v1_18_0Pre,
+			want:    "v1.19",
+		},
 	}
 
 	for name, tc := range testCases {