Ported update command

v2/internal/github/github.go

@@ -0,0 +1,103 @@
+package github
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"sort"
+	"strings"
+)
+
+// GetVersionTags gets the list of tags on the Wails repo
+// It returns a list of sorted tags in descending order
+func GetVersionTags() ([]*SemanticVersion, error) {
+
+	result := []*SemanticVersion{}
+	var err error
+
+	resp, err := http.Get("https://api.github.com/repos/wailsapp/wails/tags")
+	if err != nil {
+		return result, err
+	}
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return result, err
+	}
+
+	data := []map[string]interface{}{}
+	err = json.Unmarshal(body, &data)
+	if err != nil {
+		return result, err
+	}
+
+	// Convert tag data to Version structs
+	for _, tag := range data {
+		version := tag["name"].(string)
+		if !strings.HasPrefix(version, "v2") {
+			continue
+		}
+		semver, err := NewSemanticVersion(version)
+		if err != nil {
+			return result, err
+		}
+		result = append(result, semver)
+	}
+
+	// Reverse Sort
+	sort.Sort(sort.Reverse(SemverCollection(result)))
+
+	return result, err
+}
+
+// GetLatestStableRelease gets the latest stable release on GitHub
+func GetLatestStableRelease() (result *SemanticVersion, err error) {
+
+	tags, err := GetVersionTags()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, tag := range tags {
+		if tag.IsRelease() {
+			return tag, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no release tag found")
+}
+
+// GetLatestPreRelease gets the latest prerelease on GitHub
+func GetLatestPreRelease() (result *SemanticVersion, err error) {
+
+	tags, err := GetVersionTags()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, tag := range tags {
+		if tag.IsPreRelease() {
+			return tag, nil
+		}
+	}
+
+	return nil, fmt.Errorf("no prerelease tag found")
+}
+
+// IsValidTag returns true if the given string is a valid tag
+func IsValidTag(tagVersion string) (bool, error) {
+	if tagVersion[0] == 'v' {
+		tagVersion = tagVersion[1:]
+	}
+	tags, err := GetVersionTags()
+	if err != nil {
+		return false, err
+	}
+
+	for _, tag := range tags {
+		if tag.String() == tagVersion {
+			return true, nil
+		}
+	}
+	return false, nil
+}

v2/internal/github/semver.go

@@ -0,0 +1,106 @@
+package github
+
+import (
+	"fmt"
+
+	"github.com/Masterminds/semver"
+)
+
+// SemanticVersion is a struct containing a semantic version
+type SemanticVersion struct {
+	Version *semver.Version
+}
+
+// NewSemanticVersion creates a new SemanticVersion object with the given version string
+func NewSemanticVersion(version string) (*SemanticVersion, error) {
+	semverVersion, err := semver.NewVersion(version)
+	if err != nil {
+		return nil, err
+	}
+	return &SemanticVersion{
+		Version: semverVersion,
+	}, nil
+}
+
+// IsRelease returns true if it's a release version
+func (s *SemanticVersion) IsRelease() bool {
+	// Limit to v2
+	if s.Version.Major() != 2 {
+		return false
+	}
+	return len(s.Version.Prerelease()) == 0 && len(s.Version.Metadata()) == 0
+}
+
+// IsPreRelease returns true if it's a prerelease version
+func (s *SemanticVersion) IsPreRelease() bool {
+	// Limit to v1
+	if s.Version.Major() != 2 {
+		return false
+	}
+	return len(s.Version.Prerelease()) > 0
+}
+
+func (s *SemanticVersion) String() string {
+	return s.Version.String()
+}
+
+// IsGreaterThan returns true if this version is greater than the given version
+func (s *SemanticVersion) IsGreaterThan(version *SemanticVersion) (bool, error) {
+	// Set up new constraint
+	constraint, err := semver.NewConstraint("> " + version.Version.String())
+	if err != nil {
+		return false, err
+	}
+
+	// Check if the desired one is greater than the requested on
+	success, msgs := constraint.Validate(s.Version)
+	if !success {
+		return false, msgs[0]
+	}
+	return true, nil
+}
+
+// IsGreaterThanOrEqual returns true if this version is greater than or equal the given version
+func (s *SemanticVersion) IsGreaterThanOrEqual(version *SemanticVersion) (bool, error) {
+	// Set up new constraint
+	constraint, err := semver.NewConstraint(">= " + version.Version.String())
+	if err != nil {
+		return false, err
+	}
+
+	// Check if the desired one is greater than the requested on
+	success, msgs := constraint.Validate(s.Version)
+	if !success {
+		return false, msgs[0]
+	}
+	return true, nil
+}
+
+// MainVersion returns the main version of any version+prerelease+metadata
+// EG: MainVersion("1.2.3-pre") => "1.2.3"
+func (s *SemanticVersion) MainVersion() *SemanticVersion {
+	mainVersion := fmt.Sprintf("%d.%d.%d", s.Version.Major(), s.Version.Minor(), s.Version.Patch())
+	result, _ := NewSemanticVersion(mainVersion)
+	return result
+}
+
+// SemverCollection is a collection of SemanticVersion objects
+type SemverCollection []*SemanticVersion
+
+// Len returns the length of a collection. The number of Version instances
+// on the slice.
+func (c SemverCollection) Len() int {
+	return len(c)
+}
+
+// Less is needed for the sort interface to compare two Version objects on the
+// slice. If checks if one is less than the other.
+func (c SemverCollection) Less(i, j int) bool {
+	return c[i].Version.LessThan(c[j].Version)
+}
+
+// Swap is needed for the sort interface to replace the Version objects
+// at two different positions in the slice.
+func (c SemverCollection) Swap(i, j int) {
+	c[i], c[j] = c[j], c[i]
+}