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ls.go
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// Copyright 2013-2017 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// ls prints the contents of a directory.
//
// Synopsis:
// ls [OPTIONS] [DIRS]...
//
// Options:
// -l: long form
// -Q: quoted
// -R: equivalent to findutil's find
// -F: append indicator (one of */=>@|) to entries
//
// Bugs:
// With the `-R` flag, directories are only ever printed once.
package main
import (
"fmt"
"io"
"log"
"os"
"path/filepath"
"text/tabwriter"
flag "github.com/spf13/pflag"
"github.com/u-root/u-root/pkg/ls"
)
var (
all = flag.BoolP("all", "a", false, "show hidden files")
human = flag.BoolP("human-readable", "h", false, "human readable sizes")
directory = flag.BoolP("directory", "d", false, "list directories but not their contents")
long = flag.BoolP("long", "l", false, "long form")
quoted = flag.BoolP("quote-name", "Q", false, "quoted")
recurse = flag.BoolP("recursive", "R", false, "equivalent to findutil's find")
classify = flag.BoolP("classify", "F", false, "append indicator (one of */=>@|) to entries")
)
func listName(stringer ls.Stringer, d string, w io.Writer, prefix bool) error {
return filepath.Walk(d, func(path string, osfi os.FileInfo, err error) error {
// Soft error. Useful when a permissions are insufficient to
// stat one of the files.
if err != nil {
log.Printf("%s: %v\n", path, err)
return nil
}
fi := ls.FromOSFileInfo(path, osfi
8000
)
if *recurse {
// Mimic find command
fi.Name = path
} else if path == d {
if *directory {
fmt.Fprintln(w, stringer.FileString(fi))
return filepath.SkipDir
}
// Starting directory is a dot when non-recursive
if osfi.IsDir() {
fi.Name = "."
if prefix {
if *quoted {
fmt.Fprintf(w, "%q:\n", d)
} else {
fmt.Fprintf(w, "%v:\n", d)
}
}
}
}
// Hide .files unless -a was given
if *all || fi.Name[0] != '.' {
// Print the file in the proper format.
if *classify {
fi.Name = fi.Name + indicator(fi)
}
fmt.Fprintln(w, stringer.FileString(fi))
}
// Skip directories when non-recursive.
if path != d && fi.Mode.IsDir() && !*recurse {
return filepath.SkipDir
}
return nil
})
}
func indicator(fi ls.FileInfo) string {
if fi.Mode.IsRegular() && fi.Mode&0111 != 0 {
return "*"
}
if fi.Mode&os.ModeDir != 0 {
return "/"
}
if fi.Mode&os.ModeSymlink != 0 {
return "@"
}
if fi.Mode&os.ModeSocket != 0 {
return "="
}
if fi.Mode&os.ModeNamedPipe != 0 {
return "|"
}
return ""
}
func main() {
flag.Parse()
// Write output in tabular form.
w := &tabwriter.Writer{}
w.Init(os.Stdout, 0, 0, 1, ' ', 0)
defer w.Flush()
var s ls.Stringer = ls.NameStringer{}
if *quoted {
s = ls.QuotedStringer{}
}
if *long {
s = ls.LongStringer{Human: *human, Name: s}
}
// Array of names to list.
names := flag.Args()
if len(names) == 0 {
names = []string{"."}
}
// Is a name a directory? If so, list it in its own section.
prefix := len(names) > 1
for _, d := range names {
if err := listName(s, d, w, prefix); err != nil {
log.Printf("error while listing %#v: %v", d, err)
}
w.Flush()
}
}