Replace bash release helper scripts with Go progam

cmd/gorepomod/internal/semver/semver.go

@@ -0,0 +1,98 @@
+package semver
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// SemVer is the immutable semantic version per https://semver.org
+type SemVer struct {
+	major int
+	minor int
+	patch int
+}
+
+func New(major, minor, patch int) SemVer {
+	return SemVer{
+		major: major,
+		minor: minor,
+		patch: patch,
+	}
+}
+
+var zero = New(0, 0, 0)
+
+func Zero() SemVer {
+	return zero
+}
+
+// Versions implements sort.Interface to get decreasing order.
+type Versions []SemVer
+
+func (v Versions) Len() int           { return len(v) }
+func (v Versions) Less(i, j int) bool { return v[j].LessThan(v[i]) }
+func (v Versions) Swap(i, j int)      { v[i], v[j] = v[j], v[i] }
+
+func Parse(raw string) (SemVer, error) {
+	if len(raw) < 6 {
+		// e.g. minimal length is 6, e.g. "v1.2.3"
+		return zero, fmt.Errorf("%q too short to be a version", raw)
+	}
+	if raw[0] != 'v' {
+		return zero, fmt.Errorf("%q must start with letter 'v'", raw)
+	}
+	fields := strings.Split(raw[1:], ".")
+	if len(fields) < 3 {
+		return zero, fmt.Errorf("%q doesn't have the form v1.2.3", raw)
+	}
+	n := make([]int, 3)
+	for i := 0; i < 3; i++ {
+		var err error
+		n[i], err = strconv.Atoi(fields[i])
+		if err != nil {
+			return zero, err
+		}
+	}
+	return New(n[0], n[1], n[2]), nil
+}
+
+func (v SemVer) Bump(b SvBump) SemVer {
+	switch b {
+	case Major:
+		return New(v.major+1, 0, 0)
+	case Minor:
+		return New(v.major, v.minor+1, 0)
+	default:
+		return New(v.major, v.minor, v.patch+1)
+	}
+}
+
+func (v SemVer) BranchLabel() string {
+	return fmt.Sprintf("v%d.%d", v.major, v.minor)
+}
+
+func (v SemVer) String() string {
+	return fmt.Sprintf("v%d.%d.%d", v.major, v.minor, v.patch)
+}
+
+func (v SemVer) Pretty() string {
+	if v.IsZero() {
+		return ""
+	}
+	return v.String()
+}
+
+func (v SemVer) Equals(o SemVer) bool {
+	return v.major == o.major && v.minor == o.minor && v.patch == o.patch
+}
+
+func (v SemVer) LessThan(o SemVer) bool {
+	return v.major < o.major ||
+		(v.major == o.major && v.minor < o.minor) ||
+		(v.major == o.major && v.minor == o.minor && v.patch < o.patch)
+}
+
+func (v SemVer) IsZero() bool {
+	return v.Equals(zero)
+}

cmd/gorepomod/internal/semver/semver_test.go

@@ -0,0 +1,105 @@
+package semver
+
+import (
+	"testing"
+)
+
+func TestParse(t *testing.T) {
+	var testCases = map[string]struct {
+		raw    string
+		v      SemVer
+		errMsg string
+	}{
+		"one": {
+			raw:    "v1.2.3",
+			v:      SemVer{major: 1, minor: 2, patch: 3},
+			errMsg: "",
+		},
+		"two": {
+			raw:    "v2.0.9999",
+			v:      SemVer{major: 2, minor: 0, patch: 9999},
+			errMsg: "",
+		},
+		"three": {
+			raw:    "pizza",
+			v:      zero,
+			errMsg: "\"pizza\" too short to be a version",
+		},
+		"non-digit": {
+			raw:    "v1.x.222",
+			v:      zero,
+			errMsg: "strconv.Atoi: parsing \"x\": invalid syntax",
+		},
+		"bad fields": {
+			raw:    "v1.222",
+			v:      zero,
+			errMsg: "\"v1.222\" doesn't have the form v1.2.3",
+		},
+	}
+	for n, tc := range testCases {
+		v, err := Parse(tc.raw)
+		if err == nil {
+			if tc.errMsg != "" {
+				t.Errorf(
+					"%s: no error, but expected err %q", n, tc.errMsg)
+			}
+			if !v.Equals(tc.v) {
+				t.Errorf(
+					"%s: expected %v, got %v", n, tc.v, v)
+			}
+		} else {
+			if tc.errMsg == "" {
+				t.Errorf(
+					"%s: unexpected error %v", n, err)
+			} else {
+				if tc.errMsg != err.Error() {
+					t.Errorf(
+						"%s: expected err msg %q, but got %q",
+						n, tc.errMsg, err.Error())
+				}
+			}
+		}
+	}
+}
+
+func TestLessThan(t *testing.T) {
+	var testCases = map[string]struct {
+		v1       SemVer
+		v2       SemVer
+		expected bool
+	}{
+		"one": {
+			v1:       SemVer{major: 2, minor: 2, patch: 3},
+			v2:       SemVer{major: 1, minor: 2, patch: 3},
+			expected: false,
+		},
+		"two": {
+			v1:       SemVer{major: 1, minor: 3, patch: 3},
+			v2:       SemVer{major: 1, minor: 2, patch: 3},
+			expected: false,
+		},
+		"three": {
+			v1:       SemVer{major: 1, minor: 2, patch: 4},
+			v2:       SemVer{major: 1, minor: 2, patch: 3},
+			expected: false,
+		},
+		"eq": {
+			v1:       SemVer{major: 2, minor: 2, patch: 3},
+			v2:       SemVer{major: 2, minor: 2, patch: 3},
+			expected: false,
+		},
+		"four": {
+			v1:       zero,
+			v2:       SemVer{major: 0, minor: 0, patch: 1},
+			expected: true,
+		},
+	}
+	for n, tc := range testCases {
+		actual := tc.v1.LessThan(tc.v2)
+		if actual != tc.expected {
+			t.Errorf(
+				"%s: expected %v, got %v for %s LessThan %s",
+				n, tc.expected, actual, tc.v1.String(), tc.v2.String())
+		}
+	}
+}

cmd/gorepomod/internal/semver/svbump.go

@@ -0,0 +1,17 @@
+package semver
+
+type SvBump int
+
+const (
+	Patch SvBump = iota
+	Minor
+	Major
+)
+
+func (b SvBump) String() string {
+	return map[SvBump]string{
+		Patch: "Patch",
+		Minor: "Minor",
+		Major: "Major",
+	}[b]
+}