mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-16 12:58:48 +08:00
334 lines
6.9 KiB
Go
334 lines
6.9 KiB
Go
package edit
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import (
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"errors"
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"os"
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"path"
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"github.com/elves/elvish/parse"
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)
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// Navigation subsystem.
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// Interface.
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type navigation struct {
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current *navColumn
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parent *navColumn
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dirPreview *navColumn
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showHidden bool
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}
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func (*navigation) Mode() ModeType {
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return modeNavigation
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}
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func (*navigation) ModeLine(width int) *buffer {
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return makeModeLine(" NAVIGATING ", width)
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}
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func startNav(ed *Editor) {
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initNavigation(&ed.navigation)
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ed.mode = &ed.navigation
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}
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func navUp(ed *Editor) {
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ed.navigation.prev()
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}
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func navDown(ed *Editor) {
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ed.navigation.next()
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}
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func navLeft(ed *Editor) {
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ed.navigation.ascend()
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}
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func navRight(ed *Editor) {
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ed.navigation.descend()
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}
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func navTriggerShowHidden(ed *Editor) {
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ed.navigation.showHidden = !ed.navigation.showHidden
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ed.navigation.refresh()
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}
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func navInsertSelected(ed *Editor) {
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ed.insertAtDot(parse.Quote(ed.navigation.current.selectedName()) + " ")
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}
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func navigationDefault(ed *Editor) {
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// Use key binding for insert mode without exiting navigation mode.
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if f, ok := keyBindings[modeInsert][ed.lastKey]; ok {
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f.Call(ed)
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} else {
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keyBindings[modeInsert][Default].Call(ed)
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}
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}
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// Implementation.
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// TODO(xiaq): Support file preview in navigation mode
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// TODO(xiaq): Remember which file was selected in each directory.
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var (
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errorEmptyCwd = errors.New("current directory is empty")
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errorNoCwdInParent = errors.New("could not find current directory in ..")
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)
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func initNavigation(n *navigation) {
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*n = navigation{}
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n.refresh()
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}
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func (n *navigation) maintainSelected(name string) {
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n.current.selected = -1
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for i, s := range n.current.all {
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if s.text > name {
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break
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}
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n.current.selected = i
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}
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}
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func (n *navigation) refreshCurrent() {
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selectedName := n.current.selectedName()
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all, err := n.loaddir(".")
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if err != nil {
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n.current = newErrNavColumn(err)
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return
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}
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// Try to select the old selected file.
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// XXX(xiaq): This would break when we support alternative ordering.
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n.current = newNavColumn(all, func(i int) bool {
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return i == 0 || all[i].text <= selectedName
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})
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}
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func (n *navigation) refreshParent() {
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wd, err := os.Getwd()
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if err != nil {
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n.parent = newErrNavColumn(err)
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return
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}
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if wd == "/" {
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n.parent = newNavColumn(nil, nil)
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} else {
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all, err := n.loaddir("..")
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if err != nil {
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n.parent = newErrNavColumn(err)
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return
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}
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cwd, err := os.Stat(".")
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if err != nil {
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n.parent = newErrNavColumn(err)
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return
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}
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n.parent = newNavColumn(all, func(i int) bool {
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d, _ := os.Lstat("../" + all[i].text)
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return os.SameFile(d, cwd)
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})
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}
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}
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func (n *navigation) refreshDirPreview() {
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if n.current.selected != -1 {
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name := n.current.selectedName()
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fi, err := os.Stat(name)
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if err != nil {
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n.dirPreview = newErrNavColumn(err)
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return
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}
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if fi.Mode().IsDir() {
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all, err := n.loaddir(name)
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if err != nil {
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n.dirPreview = newErrNavColumn(err)
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return
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}
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n.dirPreview = newNavColumn(all, func(int) bool { return false })
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} else {
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// TODO(xiaq): Support regular file preview in navigation mode
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n.dirPreview = nil
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}
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} else {
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n.dirPreview = nil
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}
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}
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// refresh rereads files in current and parent directories and maintains the
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// selected file if possible.
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func (n *navigation) refresh() {
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n.refreshCurrent()
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n.refreshParent()
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n.refreshDirPreview()
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}
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// ascend changes current directory to the parent.
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// TODO(xiaq): navigation.{ascend descend} bypasses the cd builtin. This can be
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// problematic if cd acquires more functionality (e.g. trigger a hook).
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func (n *navigation) ascend() error {
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wd, err := os.Getwd()
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if err != nil {
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return err
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}
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if wd == "/" {
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return nil
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}
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name := n.parent.selectedName()
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err = os.Chdir("..")
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if err != nil {
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return err
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}
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n.refresh()
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n.maintainSelected(name)
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// XXX Refresh dir preview again. We should perhaps not have used refresh
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// above.
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n.refreshDirPreview()
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return nil
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}
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// descend changes current directory to the selected file, if it is a
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// directory.
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func (n *navigation) descend() error {
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if n.current.selected == -1 {
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return errorEmptyCwd
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}
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name := n.current.selectedName()
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err := os.Chdir(name)
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if err != nil {
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return err
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}
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n.current.selected = -1
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n.refresh()
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n.refreshDirPreview()
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return nil
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}
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// prev selects the previous file.
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func (n *navigation) prev() {
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if n.current.selected > 0 {
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n.current.selected--
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}
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n.refresh()
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}
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// next selects the next file.
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func (n *navigation) next() {
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if n.current.selected != -1 && n.current.selected < len(n.current.all)-1 {
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n.current.selected++
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}
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n.refresh()
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}
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// navColumn is a column in the navigation layout.
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type navColumn struct {
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all []styled
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selected int
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err error
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}
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func newNavColumn(all []styled, sel func(int) bool) *navColumn {
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nc := &navColumn{all, 0, nil}
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nc.selected = -1
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for i := range all {
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if sel(i) {
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nc.selected = i
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}
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}
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return nc
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}
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func newErrNavColumn(err error) *navColumn {
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return &navColumn{err: err}
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}
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func (nc *navColumn) selectedName() string {
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if nc == nil || nc.selected == -1 {
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return ""
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}
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return nc.all[nc.selected].text
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}
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func (n *navigation) loaddir(dir string) ([]styled, error) {
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f, err := os.Open(dir)
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if err != nil {
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return nil, err
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}
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infos, err := f.Readdir(0)
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if err != nil {
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return nil, err
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}
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var all []styled
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for _, info := range infos {
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if n.showHidden || info.Name()[0] != '.' {
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name := info.Name()
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all = append(all, styled{name, defaultLsColor.getStyle(path.Join(dir, name))})
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}
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}
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sortStyleds(all)
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return all, nil
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}
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const (
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navigationListingColMargin = 1
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navigationListingColPadding = 1
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navigationListingMinWidthForPadding = 5
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)
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func (nav *navigation) List(width, maxHeight int) *buffer {
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margin := navigationListingColMargin
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var ratioParent, ratioCurrent, ratioPreview int
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if nav.dirPreview != nil {
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ratioParent = 15
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ratioCurrent = 40
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ratioPreview = 45
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} else {
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ratioParent = 15
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ratioCurrent = 75
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// Leave some space at the right side
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}
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w := width - margin*2
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wParent := w * ratioParent / 100
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wCurrent := w * ratioCurrent / 100
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wPreview := w * ratioPreview / 100
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b := renderNavColumn(nav.parent, wParent, maxHeight)
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bCurrent := renderNavColumn(nav.current, wCurrent, maxHeight)
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b.extendHorizontal(bCurrent, wParent, margin)
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if wPreview > 0 {
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bPreview := renderNavColumn(nav.dirPreview, wPreview, maxHeight)
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b.extendHorizontal(bPreview, wParent+wCurrent+margin, margin)
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}
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return b
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}
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func renderNavColumn(nc *navColumn, w, h int) *buffer {
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b := newBuffer(w)
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low, high := findWindow(len(nc.all), nc.selected, h)
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for i := low; i < high; i++ {
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if i > low {
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b.newline()
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}
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text := nc.all[i].text
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style := nc.all[i].style
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if i == nc.selected {
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style += styleForSelected
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}
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if w >= navigationListingMinWidthForPadding {
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padding := navigationListingColPadding
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b.writePadding(padding, style)
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b.writes(ForceWcWidth(text, w-2), style)
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b.writePadding(padding, style)
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} else {
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b.writes(ForceWcWidth(text, w), style)
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}
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}
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return b
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}
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