github.com/go-asm/go@v1.21.1-0.20240213172139-40c5ead50c48/cmd/go/test/internal/genflags/vetflag.go (about)

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package genflags
     6  
     7  import (
     8  	"bytes"
     9  	"encoding/json"
    10  	"fmt"
    11  	"os/exec"
    12  	"regexp"
    13  	"sort"
    14  
    15  	"github.com/go-asm/go/cmd/go/base"
    16  )
    17  
    18  // VetAnalyzers computes analyzers and their aliases supported by vet.
    19  func VetAnalyzers() ([]string, error) {
    20  	// get supported vet flag information
    21  	tool := base.Tool("vet")
    22  	vetcmd := exec.Command(tool, "-flags")
    23  	out := new(bytes.Buffer)
    24  	vetcmd.Stdout = out
    25  	if err := vetcmd.Run(); err != nil {
    26  		return nil, fmt.Errorf("go vet: can't execute %s -flags: %v\n", tool, err)
    27  	}
    28  	var analysisFlags []struct {
    29  		Name  string
    30  		Bool  bool
    31  		Usage string
    32  	}
    33  	if err := json.Unmarshal(out.Bytes(), &analysisFlags); err != nil {
    34  		return nil, fmt.Errorf("go vet: can't unmarshal JSON from %s -flags: %v", tool, err)
    35  	}
    36  
    37  	// parse the flags to figure out which ones stand for analyses
    38  	analyzerSet := make(map[string]bool)
    39  	rEnable := regexp.MustCompile("^enable .+ analysis$")
    40  	for _, flag := range analysisFlags {
    41  		if rEnable.MatchString(flag.Usage) {
    42  			analyzerSet[flag.Name] = true
    43  		}
    44  	}
    45  
    46  	rDeprecated := regexp.MustCompile("^deprecated alias for -(?P<analyzer>(.+))$")
    47  	// Returns the original value matched by rDeprecated on input value.
    48  	// If there is no match, "" is returned.
    49  	originalValue := func(value string) string {
    50  		match := rDeprecated.FindStringSubmatch(value)
    51  		if len(match) < 2 {
    52  			return ""
    53  		}
    54  		return match[1]
    55  	}
    56  	// extract deprecated aliases for existing analyses
    57  	for _, flag := range analysisFlags {
    58  		if o := originalValue(flag.Usage); analyzerSet[o] {
    59  			analyzerSet[flag.Name] = true
    60  		}
    61  	}
    62  
    63  	var analyzers []string
    64  	for a := range analyzerSet {
    65  		analyzers = append(analyzers, a)
    66  	}
    67  	sort.Strings(analyzers)
    68  	return analyzers, nil
    69  }