mirror of https://github.com/cheat/cheat.git
72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gocommand
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import (
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"context"
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"fmt"
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"regexp"
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"strings"
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)
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// GoVersion reports the minor version number of the highest release
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// tag built into the go command on the PATH.
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//
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// Note that this may be higher than the version of the go tool used
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// to build this application, and thus the versions of the standard
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// go/{scanner,parser,ast,types} packages that are linked into it.
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// In that case, callers should either downgrade to the version of
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// go used to build the application, or report an error that the
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// application is too old to use the go command on the PATH.
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func GoVersion(ctx context.Context, inv Invocation, r *Runner) (int, error) {
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inv.Verb = "list"
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inv.Args = []string{"-e", "-f", `{{context.ReleaseTags}}`, `--`, `unsafe`}
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inv.BuildFlags = nil // This is not a build command.
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inv.ModFlag = ""
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inv.ModFile = ""
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inv.Env = append(inv.Env[:len(inv.Env):len(inv.Env)], "GO111MODULE=off")
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stdoutBytes, err := r.Run(ctx, inv)
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if err != nil {
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return 0, err
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}
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stdout := stdoutBytes.String()
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if len(stdout) < 3 {
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return 0, fmt.Errorf("bad ReleaseTags output: %q", stdout)
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}
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// Split up "[go1.1 go1.15]" and return highest go1.X value.
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tags := strings.Fields(stdout[1 : len(stdout)-2])
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for i := len(tags) - 1; i >= 0; i-- {
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var version int
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if _, err := fmt.Sscanf(tags[i], "go1.%d", &version); err != nil {
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continue
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}
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return version, nil
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}
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return 0, fmt.Errorf("no parseable ReleaseTags in %v", tags)
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}
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// GoVersionOutput returns the complete output of the go version command.
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func GoVersionOutput(ctx context.Context, inv Invocation, r *Runner) (string, error) {
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inv.Verb = "version"
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goVersion, err := r.Run(ctx, inv)
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if err != nil {
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return "", err
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}
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return goVersion.String(), nil
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}
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// ParseGoVersionOutput extracts the Go version string
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// from the output of the "go version" command.
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// Given an unrecognized form, it returns an empty string.
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func ParseGoVersionOutput(data string) string {
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re := regexp.MustCompile(`^go version (go\S+|devel \S+)`)
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m := re.FindStringSubmatch(data)
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if len(m) != 2 {
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return "" // unrecognized version
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}
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return m[1]
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}
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