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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
}
return Parse(s)
}
// Parse parses the Go version (like "go1.3.2") in the parameter and return the
// major and minor version: 1 and 3 in this example. If there is an error, (0,
// 0) and an error will be returned.
func Parse(version string) (major, minor int, err error) {
if version == "" || version[:2] != "go" {
return 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, 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%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, fmt.Errorf("failed to parse version: %s", err)
}
return
}
// 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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