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segment-cwd.go
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segment-cwd.go
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package main
import (
"os"
"sort"
"strings"
pwl "github.com/justjanne/powerline-go/powerline"
)
const ellipsis = "\u2026"
type pathSegment struct {
path string
home bool
root bool
ellipsis bool
alias bool
}
type byRevLength []string
func (s byRevLength) Len() int {
return len(s)
}
func (s byRevLength) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s byRevLength) Less(i, j int) bool {
return len(s[i]) > len(s[j])
}
func maybeAliasPathSegments(p *powerline, pathSegments []pathSegment) []pathSegment {
pathSeparator := string(os.PathSeparator)
if p.cfg.PathAliases == nil || len(p.cfg.PathAliases) == 0 {
return pathSegments
}
keys := make([]string, len(p.cfg.PathAliases))
for k := range p.cfg.PathAliases {
keys = append(keys, k)
}
sort.Sort(byRevLength(keys))
Aliases:
for _, k := range keys {
// This turns a string like "foo/bar/baz" into an array of strings.
path := strings.Split(strings.Trim(k, pathSeparator), pathSeparator)
// If the path has 3 elements, we know we should look at pathSegments
// in 3-element chunks.
size := len(path)
// If there aren't that many segments in our path we can skip to the
// next alias.
if size > len(pathSegments) {
continue Aliases
}
alias := p.cfg.PathAliases[k]
Segments:
// We want to see if that array of strings exists in pathSegments.
for i := range pathSegments {
// This is the upper index that we would look at. So if i is 0,
// then we'd look at pathSegments[0,1,2], then [1,2,3], etc.. If i
// is 2, we'd look at pathSegments[2,3,4] and so on.
max := (i size) - 1
// But if the upper index is out of bounds we can short-circuit
// and move on to the next alias.
if max > (len(pathSegments)-i)-1 {
continue Aliases
}
// Then we loop over the indices in path and compare the
// elements. If any element doesn't match we can move on to the
// next index in pathSegments.
for j := range path {
if path[j] != pathSegments[i j].path {
continue Segments
}
}
// They all matched! That means we can replace this slice with our
// alias and skip to the next alias.
pathSegments = append(
pathSegments[:i],
append(
[]pathSegment{{
path: alias,
alias: true,
}},
pathSegments[max 1:]...,
)...,
)
continue Aliases
}
}
return pathSegments
}
func cwdToPathSegments(p *powerline, cwd string) []pathSegment {
pathSeparator := string(os.PathSeparator)
pathSegments := make([]pathSegment, 0)
if cwd == p.userInfo.HomeDir {
pathSegments = append(pathSegments, pathSegment{
path: "~",
home: true,
})
cwd = ""
} else if strings.HasPrefix(cwd, p.userInfo.HomeDir pathSeparator) {
pathSegments = append(pathSegments, pathSegment{
path: "~",
home: true,
})
cwd = cwd[len(p.userInfo.HomeDir):]
} else if cwd == pathSeparator {
pathSegments = append(pathSegments, pathSegment{
path: pathSeparator,
root: true,
})
}
cwd = strings.Trim(cwd, pathSeparator)
names := strings.Split(cwd, pathSeparator)
if names[0] == "" {
names = names[1:]
}
for _, name := range names {
pathSegments = append(pathSegments, pathSegment{
path: name,
})
}
return maybeAliasPathSegments(p, pathSegments)
}
func maybeShortenName(p *powerline, pathSegment string) string {
if p.cfg.CwdMaxDirSize > 0 && len(pathSegment) > p.cfg.CwdMaxDirSize {
return pathSegment[:p.cfg.CwdMaxDirSize]
}
return pathSegment
}
func escapeVariables(p *powerline, pathSegment string) string {
pathSegment = strings.Replace(pathSegment, `\`, p.shell.EscapedBackslash, -1)
pathSegment = strings.Replace(pathSegment, "`", p.shell.EscapedBacktick, -1)
pathSegment = strings.Replace(pathSegment, `$`, p.shell.EscapedDollar, -1)
return pathSegment
}
func getColor(p *powerline, pathSegment pathSegment, isLastDir bool) (uint8, uint8, bool) {
if pathSegment.home && p.theme.HomeSpecialDisplay {
return p.theme.HomeFg, p.theme.HomeBg, true
} else if pathSegment.alias {
return p.theme.AliasFg, p.theme.AliasBg, true
} else if isLastDir {
return p.theme.CwdFg, p.theme.PathBg, false
}
return p.theme.PathFg, p.theme.PathBg, false
}
func segmentCwd(p *powerline) (segments []pwl.Segment) {
cwd := p.cwd
switch p.cfg.CwdMode {
case "plain":
if strings.HasPrefix(cwd, p.userInfo.HomeDir) {
cwd = "~" cwd[len(p.userInfo.HomeDir):]
}
segments = append(segments, pwl.Segment{
Name: "cwd",
Content: escapeVariables(p, cwd),
Foreground: p.theme.CwdFg,
Background: p.theme.PathBg,
})
default:
pathSegments := cwdToPathSegments(p, cwd)
if p.cfg.CwdMode == "dironly" {
pathSegments = pathSegments[len(pathSegments)-1:]
} else {
maxDepth := p.cfg.CwdMaxDepth
if maxDepth <= 0 {
warn("Ignoring -cwd-max-depth argument since it's smaller than or equal to 0")
} else if len(pathSegments) > maxDepth {
var nBefore int
if maxDepth > 2 {
nBefore = 2
} else {
nBefore = maxDepth - 1
}
firstPart := pathSegments[:nBefore]
secondPart := pathSegments[len(pathSegments) nBefore-maxDepth:]
pathSegments = make([]pathSegment, 0)
pathSegments = append(pathSegments, firstPart...)
pathSegments = append(pathSegments, pathSegment{
path: ellipsis,
ellipsis: true,
})
pathSegments = append(pathSegments, secondPart...)
}
if p.cfg.CwdMode == "semifancy" && len(pathSegments) > 1 {
var path string
for idx, pathSegment := range pathSegments {
if pathSegment.home || pathSegment.alias {
continue
}
path = pathSegment.path
if idx != len(pathSegments)-1 {
path = string(os.PathSeparator)
}
}
first := pathSegments[0]
pathSegments = make([]pathSegment, 0)
if first.home || first.alias {
pathSegments = append(pathSegments, first)
}
pathSegments = append(pathSegments, pathSegment{
path: path,
})
}
}
for idx, pathSegment := range pathSegments {
isLastDir := idx == len(pathSegments)-1
foreground, background, special := getColor(p, pathSegment, isLastDir)
segment := pwl.Segment{
Content: escapeVariables(p, maybeShortenName(p, pathSegment.path)),
Foreground: foreground,
Background: background,
}
if !special {
if p.align == alignRight && p.supportsRightModules() && idx != 0 {
segment.Separator = p.symbols.SeparatorReverseThin
segment.SeparatorForeground = p.theme.SeparatorFg
} else if (p.align == alignLeft || !p.supportsRightModules()) && !isLastDir {
segment.Separator = p.symbols.SeparatorThin
segment.SeparatorForeground = p.theme.SeparatorFg
}
}
segment.Name = "cwd-path"
if isLastDir {
segment.Name = "cwd"
}
segments = append(segments, segment)
}
}
return segments
}