1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
package parser
import (
"bytes"
"fmt"
"go/build"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"strings"
"sync"
)
func getPkgPath(fname string, isDir bool) (string, error) {
if !filepath.IsAbs(fname) {
pwd, err := os.Getwd()
if err != nil {
return "", err
}
fname = filepath.Join(pwd, fname)
}
goModPath, _ := goModPath(fname, isDir)
if strings.Contains(goModPath, "go.mod") {
pkgPath, err := getPkgPathFromGoMod(fname, isDir, goModPath)
if err != nil {
return "", err
}
return pkgPath, nil
}
return getPkgPathFromGOPATH(fname, isDir)
}
var goModPathCache = struct {
paths map[string]string
sync.RWMutex
}{
paths: make(map[string]string),
}
// empty if no go.mod, GO111MODULE=off or go without go modules support
func goModPath(fname string, isDir bool) (string, error) {
root := fname
if !isDir {
root = filepath.Dir(fname)
}
goModPathCache.RLock()
goModPath, ok := goModPathCache.paths[root]
goModPathCache.RUnlock()
if ok {
return goModPath, nil
}
defer func() {
goModPathCache.Lock()
goModPathCache.paths[root] = goModPath
goModPathCache.Unlock()
}()
cmd := exec.Command("go", "env", "GOMOD")
cmd.Dir = root
stdout, err := cmd.Output()
if err != nil {
return "", err
}
goModPath = string(bytes.TrimSpace(stdout))
return goModPath, nil
}
func getPkgPathFromGoMod(fname string, isDir bool, goModPath string) (string, error) {
modulePath := getModulePath(goModPath)
if modulePath == "" {
return "", fmt.Errorf("cannot determine module path from %s", goModPath)
}
rel := path.Join(modulePath, filePathToPackagePath(strings.TrimPrefix(fname, filepath.Dir(goModPath))))
if !isDir {
return path.Dir(rel), nil
}
return path.Clean(rel), nil
}
var pkgPathFromGoModCache = struct {
paths map[string]string
sync.RWMutex
}{
paths: make(map[string]string),
}
func getModulePath(goModPath string) string {
pkgPathFromGoModCache.RLock()
pkgPath, ok := pkgPathFromGoModCache.paths[goModPath]
pkgPathFromGoModCache.RUnlock()
if ok {
return pkgPath
}
defer func() {
pkgPathFromGoModCache.Lock()
pkgPathFromGoModCache.paths[goModPath] = pkgPath
pkgPathFromGoModCache.Unlock()
}()
data, err := ioutil.ReadFile(goModPath)
if err != nil {
return ""
}
pkgPath = modulePath(data)
return pkgPath
}
func getPkgPathFromGOPATH(fname string, isDir bool) (string, error) {
gopath := os.Getenv("GOPATH")
if gopath == "" {
gopath = build.Default.GOPATH
}
for _, p := range strings.Split(gopath, string(filepath.ListSeparator)) {
prefix := filepath.Join(p, "src") + string(filepath.Separator)
rel, err := filepath.Rel(prefix, fname)
if err == nil && !strings.HasPrefix(rel, ".."+string(filepath.Separator)) {
if !isDir {
return path.Dir(filePathToPackagePath(rel)), nil
} else {
return path.Clean(filePathToPackagePath(rel)), nil
}
}
}
return "", fmt.Errorf("file '%v' is not in GOPATH '%v'", fname, gopath)
}
func filePathToPackagePath(path string) string {
return filepath.ToSlash(path)
}
|
