refactor(pkg/semanticrelease): clean up code

internal/calculator/calculator.go

@@ -0,0 +1,68 @@
+package calculator
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/Masterminds/semver"
+	"github.com/Nightapes/go-semantic-release/internal/analyzer"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// Calculator struct
+type Calculator struct{}
+
+// New Calculator struct
+func New() *Calculator {
+	return &Calculator{}
+}
+
+//IncPrerelease increase prerelease by one
+func (c *Calculator) IncPrerelease(preReleaseType string, version *semver.Version) (semver.Version, error) {
+	defaultPrerelease := preReleaseType + ".0"
+	if version.Prerelease() == "" || !strings.HasPrefix(version.Prerelease(), preReleaseType) {
+		return version.SetPrerelease(defaultPrerelease)
+	}
+
+	parts := strings.Split(version.Prerelease(), ".")
+	if len(parts) == 2 {
+		i, err := strconv.Atoi(parts[1])
+		if err != nil {
+			log.Warnf("Could not parse release tag %s, use version %s", version.Prerelease(), version.String())
+			return version.SetPrerelease(defaultPrerelease)
+		}
+		return version.SetPrerelease(preReleaseType + "." + strconv.Itoa((i + 1)))
+
+	}
+	log.Warnf("Could not parse release tag %s, use version %s", version.Prerelease(), version.String())
+	return version.SetPrerelease(defaultPrerelease)
+}
+
+//CalculateNewVersion from given commits and lastversion
+func (c *Calculator) CalculateNewVersion(commits map[analyzer.Release][]analyzer.AnalyzedCommit, lastVersion *semver.Version, releaseType string, firstRelease bool) (semver.Version, bool) {
+	switch releaseType {
+	case "beta", "alpha":
+		if len(commits["major"]) > 0 || len(commits["minor"]) > 0 || len(commits["patch"]) > 0 {
+			version, _ := c.IncPrerelease(releaseType, lastVersion)
+			return version, true
+		}
+	case "rc":
+		if len(commits["major"]) > 0 || len(commits["minor"]) > 0 || len(commits["patch"]) > 0 {
+			version, _ := c.IncPrerelease(releaseType, lastVersion)
+			return version, false
+		}
+	case "release":
+		if !firstRelease {
+			if len(commits["major"]) > 0 {
+				return lastVersion.IncMajor(), false
+			} else if len(commits["minor"]) > 0 {
+				return lastVersion.IncMinor(), false
+			} else if len(commits["patch"]) > 0 {
+				return lastVersion.IncPatch(), false
+			}
+		}
+	}
+
+	return *lastVersion, false
+}