1// Copyright © 2015 Steve Francia <spf@spf13.com>. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// http://www.apache.org/licenses/LICENSE-2.0 7// 8// Unless required by applicable law or agreed to in writing, software 9// distributed under the License is distributed on an "AS IS" BASIS, 10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11// See the License for the specific language governing permissions and 12// limitations under the License. 13 14package cmd 15 16import ( 17 "bytes" 18 "fmt" 19 "io" 20 "os" 21 "os/exec" 22 "path/filepath" 23 "strings" 24 "text/template" 25) 26 27var srcPaths []string 28 29func init() { 30 // Initialize srcPaths. 31 envGoPath := os.Getenv("GOPATH") 32 goPaths := filepath.SplitList(envGoPath) 33 if len(goPaths) == 0 { 34 // Adapted from https://github.com/Masterminds/glide/pull/798/files. 35 // As of Go 1.8 the GOPATH is no longer required to be set. Instead there 36 // is a default value. If there is no GOPATH check for the default value. 37 // Note, checking the GOPATH first to avoid invoking the go toolchain if 38 // possible. 39 40 goExecutable := os.Getenv("COBRA_GO_EXECUTABLE") 41 if len(goExecutable) <= 0 { 42 goExecutable = "go" 43 } 44 45 out, err := exec.Command(goExecutable, "env", "GOPATH").Output() 46 if err != nil { 47 er(err) 48 } 49 50 toolchainGoPath := strings.TrimSpace(string(out)) 51 goPaths = filepath.SplitList(toolchainGoPath) 52 if len(goPaths) == 0 { 53 er("$GOPATH is not set") 54 } 55 } 56 srcPaths = make([]string, 0, len(goPaths)) 57 for _, goPath := range goPaths { 58 srcPaths = append(srcPaths, filepath.Join(goPath, "src")) 59 } 60} 61 62func er(msg interface{}) { 63 fmt.Println("Error:", msg) 64 os.Exit(1) 65} 66 67// isEmpty checks if a given path is empty. 68// Hidden files in path are ignored. 69func isEmpty(path string) bool { 70 fi, err := os.Stat(path) 71 if err != nil { 72 er(err) 73 } 74 75 if !fi.IsDir() { 76 return fi.Size() == 0 77 } 78 79 f, err := os.Open(path) 80 if err != nil { 81 er(err) 82 } 83 defer f.Close() 84 85 names, err := f.Readdirnames(-1) 86 if err != nil && err != io.EOF { 87 er(err) 88 } 89 90 for _, name := range names { 91 if len(name) > 0 && name[0] != '.' { 92 return false 93 } 94 } 95 return true 96} 97 98// exists checks if a file or directory exists. 99func exists(path string) bool { 100 if path == "" { 101 return false 102 } 103 _, err := os.Stat(path) 104 if err == nil { 105 return true 106 } 107 if !os.IsNotExist(err) { 108 er(err) 109 } 110 return false 111} 112 113func executeTemplate(tmplStr string, data interface{}) (string, error) { 114 tmpl, err := template.New("").Funcs(template.FuncMap{"comment": commentifyString}).Parse(tmplStr) 115 if err != nil { 116 return "", err 117 } 118 119 buf := new(bytes.Buffer) 120 err = tmpl.Execute(buf, data) 121 return buf.String(), err 122} 123 124func writeStringToFile(path string, s string) error { 125 return writeToFile(path, strings.NewReader(s)) 126} 127 128// writeToFile writes r to file with path only 129// if file/directory on given path doesn't exist. 130func writeToFile(path string, r io.Reader) error { 131 if exists(path) { 132 return fmt.Errorf("%v already exists", path) 133 } 134 135 dir := filepath.Dir(path) 136 if dir != "" { 137 if err := os.MkdirAll(dir, 0777); err != nil { 138 return err 139 } 140 } 141 142 file, err := os.Create(path) 143 if err != nil { 144 return err 145 } 146 defer file.Close() 147 148 _, err = io.Copy(file, r) 149 return err 150} 151 152// commentfyString comments every line of in. 153func commentifyString(in string) string { 154 var newlines []string 155 lines := strings.Split(in, "\n") 156 for _, line := range lines { 157 if strings.HasPrefix(line, "//") { 158 newlines = append(newlines, line) 159 } else { 160 if line == "" { 161 newlines = append(newlines, "//") 162 } else { 163 newlines = append(newlines, "// "+line) 164 } 165 } 166 } 167 return strings.Join(newlines, "\n") 168} 169