/
go-nyet.go
171 lines (152 loc) · 3.55 KB
/
go-nyet.go
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
package main
import (
"flag"
"fmt"
"go/ast"
"go/build"
"go/parser"
"go/token"
"go/types"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
var debug = flag.Bool("debug", false, "Enable debug printing.")
var exitWith = flag.Int("exitWith", 1, "Error code to exit with, if there are errors")
var hasErrors = false
type fileMetadata struct {
pkg *pkg
f *ast.File
fset *token.FileSet
src []byte
filename string
}
func usage() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
fmt.Fprintf(os.Stderr, "\tgo-nyet [flags] # runs on package in current directory\n")
fmt.Fprintf(os.Stderr, "\tgo-nyet [flags] package\n")
fmt.Fprintf(os.Stderr, "\tgo-nyet [flags] directory\n")
fmt.Fprintf(os.Stderr, "\tgo-nyet [flags] files... # must be a single package\n")
fmt.Fprintf(os.Stderr, "Flags:\n")
flag.PrintDefaults()
}
func main() {
flag.Usage = usage
flag.Parse()
switch flag.NArg() {
case 0:
doDir(".")
case 1:
arg := flag.Arg(0)
if strings.HasSuffix(arg, "/...") && isDir(arg[:len(arg)-4]) {
for _, dirname := range allPackagesInFS(arg) {
doDir(dirname)
}
} else if isDir(arg) {
doDir(arg)
} else if exists(arg) {
doFiles(arg)
} else {
for _, pkgname := range importPaths([]string{arg}) {
doPackage(pkgname)
}
}
default:
doFiles(flag.Args()...)
}
}
func isDir(filename string) bool {
fi, err := os.Stat(filename)
return err == nil && fi.IsDir()
}
func exists(filename string) bool {
_, err := os.Stat(filename)
return err == nil
}
// pkg represents a package being checked.
type pkg struct {
fset *token.FileSet
files map[string]*fileMetadata
typesPkg *types.Package
typesInfo *types.Info
}
func doFiles(filenames ...string) {
files := make(map[string][]byte)
for _, filename := range filenames {
src, err := ioutil.ReadFile(filename)
if err != nil {
if *debug {
fmt.Fprintln(os.Stderr, err)
}
continue
}
files[filename] = src
}
pkg := &pkg{
fset: token.NewFileSet(),
files: make(map[string]*fileMetadata),
typesInfo: &types.Info{
Types: make(map[ast.Expr]types.TypeAndValue),
},
}
var pkgName string
for filename, src := range files {
if *debug {
fmt.Println("Checking file", filename, "...")
}
f, err := parser.ParseFile(pkg.fset, filename, src, parser.ParseComments)
if err != nil {
fmt.Printf("%s: %s\n", filename, err)
return
}
if pkgName == "" {
pkgName = f.Name.Name
} else if f.Name.Name != pkgName {
fmt.Printf("%s is in package %s, not %s", filename, f.Name.Name, pkgName)
return
}
file := fileMetadata{
pkg: pkg,
f: f,
fset: pkg.fset,
src: src,
filename: filename,
}
CheckNoShadow(file)
CheckNoAssignUnused(file)
}
}
func doDir(dirname string) {
pkg, err := build.ImportDir(dirname, 0)
doImportedPackage(pkg, err)
}
func doPackage(pkgname string) {
pkg, err := build.Import(pkgname, ".", 0)
doImportedPackage(pkg, err)
}
func doImportedPackage(pkg *build.Package, err error) {
if err != nil {
if _, nogo := err.(*build.NoGoError); nogo {
// Don't complain if the failure is due to no Go source files.
return
}
fmt.Fprintln(os.Stderr, err)
return
}
var files []string
files = append(files, pkg.GoFiles...)
files = append(files, pkg.CgoFiles...)
files = append(files, pkg.TestGoFiles...)
files = append(files, pkg.SFiles...)
doLocalFiles(pkg, files...)
doLocalFiles(pkg, pkg.XTestGoFiles...)
}
func doLocalFiles(pkg *build.Package, files ...string) {
if pkg.Dir != "." {
for i, f := range files {
files[i] = filepath.Join(pkg.Dir, f)
}
}
doFiles(files...)
}