forked from mirror/cobra
151 lines
3.2 KiB
Go
151 lines
3.2 KiB
Go
// Copyright © 2015 Steve Francia <spf@spf13.com>.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cmd
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"text/template"
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)
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var cmdDirs = [...]string{"cmd", "cmds", "command", "commands"}
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var srcPaths []string
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func init() {
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// Initialize srcPaths.
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envGoPath := os.Getenv("GOPATH")
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goPaths := filepath.SplitList(envGoPath)
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if len(goPaths) == 0 {
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er("$GOPATH is not set")
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}
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srcPaths = make([]string, 0, len(goPaths))
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for _, goPath := range goPaths {
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srcPaths = append(srcPaths, filepath.Join(goPath, "src"))
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}
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}
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func er(msg interface{}) {
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fmt.Println("Error:", msg)
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os.Exit(1)
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}
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// isEmpty checks if a given path is empty.
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// Hidden files in path are ignored.
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func isEmpty(path string) bool {
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fi, err := os.Stat(path)
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if err != nil {
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er(err)
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}
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if !fi.IsDir() {
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return fi.Size() == 0
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}
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f, err := os.Open(path)
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if err != nil {
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er(err)
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}
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defer f.Close()
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names, err := f.Readdirnames(-1)
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if err != nil && err != io.EOF {
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er(err)
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}
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for _, name := range names {
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if len(name) > 0 && name[0] != '.' {
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return false
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}
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}
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return true
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}
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// exists checks if a file or directory exists.
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func exists(path string) bool {
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if path == "" {
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return false
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}
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_, err := os.Stat(path)
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if err == nil {
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return true
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}
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if !os.IsNotExist(err) {
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er(err)
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}
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return false
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}
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func executeTemplate(tmplStr string, data interface{}) (string, error) {
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tmpl, err := template.New("").Funcs(template.FuncMap{"comment": commentifyString}).Parse(tmplStr)
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if err != nil {
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return "", err
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}
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buf := new(bytes.Buffer)
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err = tmpl.Execute(buf, data)
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return buf.String(), err
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}
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func writeStringToFile(path string, s string) error {
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return writeToFile(path, strings.NewReader(s))
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}
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// writeToFile writes r to file with path only
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// if file/directory on given path doesn't exist.
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// If file/directory exists on given path, then
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// it terminates app and prints an appropriate error.
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func writeToFile(path string, r io.Reader) error {
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if exists(path) {
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return fmt.Errorf("%v already exists", path)
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}
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dir := filepath.Dir(path)
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if dir != "" {
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if err := os.MkdirAll(dir, 0777); err != nil {
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return err
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}
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}
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file, err := os.Create(path)
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if err != nil {
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return err
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}
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defer file.Close()
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_, err = io.Copy(file, r)
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return err
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}
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// commentfyString comments every line of in.
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func commentifyString(in string) string {
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var newlines []string
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lines := strings.Split(in, "\n")
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for _, line := range lines {
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if strings.HasPrefix(line, "//") {
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newlines = append(newlines, line)
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} else {
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if line == "" {
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newlines = append(newlines, "//")
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} else {
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newlines = append(newlines, "// "+line)
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}
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}
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}
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return strings.Join(newlines, "\n")
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}
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