fix: increase patch on prerelease if current version not prerelease (#230)

closes #229

Signed-off-by: Carlos Alexandro Becker <[email protected]>

Author: caarlos0

internal/svu/svu.go

@@ -143,6 +143,13 @@ func nextPreRelease(current, next *semver.Version, prerelease string) (semver.Ve
 
 	currentWithoutPreRelease, _ := current.SetPrerelease("")
 
+	// If current is a normal release (no prerelease) and the computed next is not greater than current,
+	// bump the base version (patch) so that the prerelease targets the next normal version.
+	if current.Prerelease() == "" && !next.GreaterThan(&currentWithoutPreRelease) {
+		bumped := current.IncPatch()
+		next = &bumped
+	}
+
 	if !next.GreaterThan(&currentWithoutPreRelease) {
 		preReleaseVersion = -1
 		if len(splitSuffix) == 2 {

internal/svu/svu_test.go

@@ -368,6 +368,16 @@ func Test_nextPreRelease(t *testing.T) {
 			want:    *semver.MustParse("1.2.3-alpha123.2"),
 			wantErr: false,
 		},
+		{
+			name: "from normal version, bump base to next patch when creating prerelease",
+			args: args{
+				current:    semver.MustParse("0.8.0"),
+				next:       semver.MustParse("0.8.0"),
+				preRelease: "dev",
+			},
+			want:    *semver.MustParse("0.8.1-dev.0"),
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {