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gosource.go
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gosource.go
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// This file defines a Source that goes to and completes paths for Go.
package main
import (
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
// NewGoSource returns a Source that goes to and completes paths for
// Go. It respects the current $GOROOT and the directories on the
// $GOPATH just as `go build` does.
func NewGoSource() Source {
sources := mergedSource{NewDirSource(os.Getenv("GOROOT") +
string(os.PathSeparator) + "src" + string(os.PathSeparator) + "pkg")}
for _, source := range filepath.SplitList(os.Getenv("GOPATH")) {
sources = append(sources, NewDirSource(source+string(os.PathSeparator)+"src"))
}
return sources
}
// NewDirSource returns a Source that provides recursive completions
// of subdirectories of the given directory.
func NewDirSource(dir string) Source {
return &dirSource{dir}
}
type dirSource struct {
dir string
}
// Goto goes to the given subdirectory if it exists on the filesystem.
func (s *dirSource) Goto(dest string) (string, error) {
dir := s.dir + string(os.PathSeparator) + dest
_, err := ioutil.ReadDir(dir)
if err != nil {
return "", errors.New(fmt.Sprintf("No such shortcut %s", dest))
}
return dir, nil
}
// Complete returns recursive completion of all (sub)+directories of
// the current directory source.
func (s *dirSource) Complete(prefix string) []string {
n := strings.LastIndex(prefix, string(os.PathSeparator))
if n == -1 {
return completionsForDir(s.dir, prefix)
} else {
dir := s.dir + string(os.PathSeparator) + prefix[:n]
var completions []string
for _, completion := range completionsForDir(dir, prefix[n+1:]) {
completions = append(completions, prefix[:n]+string(os.PathSeparator)+completion)
}
return completions
}
}
func completionsForDir(dir, prefix string) []string {
paths, err := ioutil.ReadDir(dir)
if err != nil {
return nil
}
var completions []string
for _, path := range paths {
if path.IsDir() && strings.HasPrefix(path.Name(), prefix) {
completions = append(completions, path.Name()+string(os.PathSeparator))
}
}
return completions
}