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package goenv
import (
"errors"
"fmt"
"io"
"strings"
)
// Version of TinyGo.
// Update this value before release of new version of software.
const version = "0.34.0-dev"
var (
// This variable is set at build time using -ldflags parameters.
// See: https://stackoverflow.com/a/11355611
GitSha1 string
)
// Return TinyGo version, either in the form 0.30.0 or as a development version
// (like 0.30.0-dev-abcd012).
func Version() string {
v := version
if strings.HasSuffix(version, "-dev") && GitSha1 != "" {
v += "-" + GitSha1
}
return v
}
// GetGorootVersion returns the major and minor version for a given GOROOT path.
// If the goroot cannot be determined, (0, 0) is returned.
func GetGorootVersion() (major, minor int, err error) {
s, err := GorootVersionString()
if err != nil {
return 0, 0, err
}
major, minor, _, err = Parse(s)
return major, minor, err
}
// Parse parses the Go version (like "go1.3.2") in the parameter and return the
// major, minor, and patch version: 1, 3, and 2 in this example.
// If there is an error, (0, 0, 0) and an error will be returned.
func Parse(version string) (major, minor, patch int, err error) {
if version == "" || version[:2] != "go" {
return 0, 0, 0, errors.New("could not parse Go version: version does not start with 'go' prefix")
}
parts := strings.Split(version[2:], ".")
if len(parts) < 2 {
return 0, 0, 0, errors.New("could not parse Go version: version has less than two parts")
}
// Ignore the errors, we don't really handle errors here anyway.
var trailing string
n, err := fmt.Sscanf(version, "go%d.%d.%d%s", &major, &minor, &patch, &trailing)
if n == 2 {
n, err = fmt.Sscanf(version, "go%d.%d%s", &major, &minor, &trailing)
}
if n >= 2 && err == io.EOF {
// Means there were no trailing characters (i.e., not an alpha/beta)
err = nil
}
if err != nil {
return 0, 0, 0, fmt.Errorf("failed to parse version: %s", err)
}
return major, minor, patch, nil
}
// Compare compares two Go version strings.
// The result will be 0 if a == b, -1 if a < b, and +1 if a > b.
// If either a or b is not a valid Go version, it is treated as "go0.0"
// and compared lexicographically.
// See [Parse] for more information.
func Compare(a, b string) int {
aMajor, aMinor, aPatch, _ := Parse(a)
bMajor, bMinor, bPatch, _ := Parse(b)
switch {
case aMajor < bMajor:
return -1
case aMajor > bMajor:
return +1
case aMinor < bMinor:
return -1
case aMinor > bMinor:
return +1
case aPatch < bPatch:
return -1
case aPatch > bPatch:
return +1
default:
return strings.Compare(a, b)
}
}
// GorootVersionString returns the version string as reported by the Go
// toolchain. It is usually of the form `go1.x.y` but can have some variations
// (for beta releases, for example).
func GorootVersionString() (string, error) {
err := readGoEnvVars()
return goEnvVars.GOVERSION, err
}
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