2014-03-08 15:43:05 +08:00
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package edit
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import (
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"os"
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"path"
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"strings"
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"syscall"
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)
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2016-02-12 20:31:24 +08:00
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// Color files based on their various features.
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//
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2014-03-08 15:43:05 +08:00
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// This is a reverse-engineered implementation of the parsing and
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// interpretation of the LS_COLORS environmental variable used by GNU
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// coreutils.
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type fileFeature int
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const (
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featureInvalid fileFeature = iota
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featureOrphanedSymlink
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featureSymlink
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featureMultiHardLink
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featureNamedPipe
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featureSocket
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featureDoor
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featureBlockDevice
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featureCharDevice
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featureWorldWritableStickyDirectory
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featureWorldWritableDirectory
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featureStickyDirectory
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featureDirectory
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featureCapability
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featureSetuid
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featureSetgid
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featureExecutable
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featureRegular
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)
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var featureForName = map[string]fileFeature{
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"rs": featureRegular,
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"di": featureDirectory,
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"ln": featureSymlink,
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"mh": featureMultiHardLink,
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"pi": featureNamedPipe,
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"so": featureSocket,
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"do": featureDoor,
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"bd": featureBlockDevice,
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"cd": featureCharDevice,
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"or": featureOrphanedSymlink,
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"su": featureSetuid,
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"sg": featureSetgid,
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"ca": featureCapability,
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"tw": featureWorldWritableStickyDirectory,
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"ow": featureWorldWritableDirectory,
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"st": featureStickyDirectory,
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"ex": featureExecutable,
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}
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type lsColor struct {
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2016-01-31 09:36:26 +08:00
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styleForFeature map[fileFeature]string
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styleForExt map[string]string
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2014-03-08 15:43:05 +08:00
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}
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2016-10-03 22:06:36 +08:00
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const defaultLsColorString = `rs=:di=01;34:ln=01;36:mh=:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=36:*.au=36:*.flac=36:*.mid=36:*.midi=36:*.mka=36:*.mp3=36:*.mpc=36:*.ogg=36:*.ra=36:*.wav=36:*.axa=36:*.oga=36:*.spx=36:*.xspf=36:`
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2014-03-08 15:43:05 +08:00
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2016-10-10 23:58:53 +08:00
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func getLsColorString() string {
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lsColorString := os.Getenv("LS_COLORS")
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if len(lsColorString) == 0 {
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return defaultLsColorString
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}
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return lsColorString
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}
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func getLsColor() *lsColor {
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return parseLsColor(getLsColorString())
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}
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2014-03-08 15:43:05 +08:00
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2015-01-23 07:38:44 +08:00
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// parseLsColor parses a string in the LS_COLORS format into lsColor. Erroneous
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// fields are silently ignored.
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2014-03-08 15:43:05 +08:00
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func parseLsColor(s string) *lsColor {
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lc := &lsColor{make(map[fileFeature]string), make(map[string]string)}
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for _, spec := range strings.Split(s, ":") {
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words := strings.Split(spec, "=")
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if len(words) != 2 {
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continue
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}
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key, value := words[0], words[1]
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filterValues := []string{}
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for _, splitValue := range strings.Split(value, ";") {
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if strings.Count(splitValue, "0") == len(splitValue) {
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continue
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}
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filterValues = append(filterValues, splitValue)
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}
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if len(filterValues) == 0 {
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continue
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}
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value = strings.Join(filterValues, ";")
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2014-03-08 15:43:05 +08:00
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if strings.HasPrefix(key, "*.") {
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2016-01-31 09:36:26 +08:00
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lc.styleForExt[key[2:]] = value
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2014-03-08 15:43:05 +08:00
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} else {
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feature, ok := featureForName[key]
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if !ok {
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continue
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}
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lc.styleForFeature[feature] = value
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2014-03-08 15:43:05 +08:00
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}
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}
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return lc
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}
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2014-03-08 16:05:13 +08:00
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func is(u, p uint32) bool {
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return u&p == p
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}
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2014-10-01 08:07:11 +08:00
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// Weirdly, permission masks for group and other are missing on platforms other
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// than linux, darwin and netbsd. So we replicate some of them here.
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const (
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S_IWOTH = 0x2 // Writable by other
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S_IXGRP = 0x8 // Executable by group
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S_IXOTH = 0x1 // Executable by other
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)
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2014-03-08 15:43:05 +08:00
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func determineFeature(fname string, mh bool) (fileFeature, error) {
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var stat syscall.Stat_t
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2014-03-08 16:19:18 +08:00
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err := syscall.Lstat(fname, &stat)
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2014-03-08 15:43:05 +08:00
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if err != nil {
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return 0, err
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}
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2014-09-28 00:17:55 +08:00
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// The type of syscall.Stat_t.Mode is uint32 on Linux and uint16 on Mac
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m := (uint32)(stat.Mode)
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// Symlink and OrphanedSymlink has highest precedence
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if is(m, syscall.S_IFLNK) {
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_, err := os.Stat(fname)
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2015-02-25 04:38:50 +08:00
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if err != nil {
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2014-03-08 15:43:05 +08:00
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return featureOrphanedSymlink, nil
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}
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2015-02-25 04:38:50 +08:00
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return featureSymlink, nil
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2014-03-08 15:43:05 +08:00
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}
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// featureMultiHardLink
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if mh && stat.Nlink > 1 {
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return featureMultiHardLink, nil
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}
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// type bits features
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switch {
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case is(m, syscall.S_IFIFO):
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2014-03-08 15:43:05 +08:00
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return featureNamedPipe, nil
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_IFSOCK):
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return featureSocket, nil
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/*
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case m | syscall.S_IFDOOR != 0:
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return featureDoor, nil
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*/
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_IFBLK):
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2014-03-08 15:43:05 +08:00
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return featureBlockDevice, nil
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_IFCHR):
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2014-03-08 15:43:05 +08:00
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return featureCharDevice, nil
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_IFDIR):
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2014-03-08 15:43:05 +08:00
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// Perm bits features for directory
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switch {
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2014-10-01 08:07:11 +08:00
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case is(m, S_IWOTH|syscall.S_ISVTX):
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2014-03-08 15:43:05 +08:00
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return featureWorldWritableStickyDirectory, nil
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2014-10-01 08:07:11 +08:00
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case is(m, S_IWOTH):
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2014-03-08 15:43:05 +08:00
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return featureWorldWritableDirectory, nil
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_ISVTX):
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2014-03-08 15:43:05 +08:00
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return featureStickyDirectory, nil
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default:
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return featureDirectory, nil
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}
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}
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// TODO(xiaq): Support featureCapacity
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// Perm bits features for regular files
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switch {
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_ISUID):
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2014-03-08 15:43:05 +08:00
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return featureSetuid, nil
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2014-03-08 16:05:13 +08:00
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case is(m, syscall.S_ISGID):
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2014-03-08 15:43:05 +08:00
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return featureSetgid, nil
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2014-10-01 08:07:11 +08:00
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case m&(syscall.S_IXUSR|S_IXGRP|S_IXOTH) != 0:
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2014-03-08 15:43:05 +08:00
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return featureExecutable, nil
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}
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// Check extension
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return featureRegular, nil
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}
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2016-01-31 09:36:26 +08:00
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func (lc *lsColor) getStyle(fname string) string {
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mh := strings.Trim(lc.styleForFeature[featureMultiHardLink], "0") != ""
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2014-03-08 15:43:05 +08:00
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// TODO Handle error from determineFeature
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feature, _ := determineFeature(fname, mh)
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if feature == featureRegular {
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if ext := path.Ext(fname); ext != "" {
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2016-01-31 09:36:26 +08:00
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if style, ok := lc.styleForExt[ext]; ok {
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return style
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2014-03-08 15:43:05 +08:00
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}
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}
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}
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2016-01-31 09:36:26 +08:00
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return lc.styleForFeature[feature]
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2014-03-08 15:43:05 +08:00
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}
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