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narrow.go
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narrow.go
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package edit
import (
"container/list"
"strings"
"unicode/utf8"
"github.com/u-root/u-root/cmds/core/elvish/edit/eddefs"
"github.com/u-root/u-root/cmds/core/elvish/edit/ui"
"github.com/u-root/u-root/cmds/core/elvish/eval"
"github.com/u-root/u-root/cmds/core/elvish/eval/vals"
"github.com/u-root/u-root/cmds/core/elvish/eval/vars"
"github.com/u-root/u-root/cmds/core/elvish/parse/parseutil"
"github.com/u-root/u-root/cmds/core/elvish/hashmap"
)
// narrow implements a listing mode that supports the notion of selecting an
// entry and filtering entries.
type narrow struct {
binding eddefs.BindingMap
narrowState
}
func init() { atEditorInit(initNarrow) }
func initNarrow(ed *editor, ns eval.Ns) {
n := &narrow{binding: emptyBindingMap}
subns := eval.Ns{
"binding": vars.FromPtr(&n.binding),
}
subns.AddBuiltinFns("edit:narrow:", map[string]interface{}{
"up": func() { n.up(false) },
"up-cycle": func() { n.up(true) },
"page-up": func() { n.pageUp() },
"down": func() { n.down(false) },
"down-cycle": func() { n.down(true) },
"page-down": func() { n.pageDown() },
"backspace": func() { n.backspace() },
"accept": func() { n.accept(ed) },
"accept-close": func() {
n.accept(ed)
ed.SetModeInsert()
},
"toggle-ignore-duplication": func() {
n.opts.IgnoreDuplication = !n.opts.IgnoreDuplication
n.refresh()
},
"toggle-ignore-case": func() {
n.opts.IgnoreCase = !n.opts.IgnoreCase
n.refresh()
},
"default": func() { n.defaultBinding(ed) },
})
ns.AddNs("narrow", subns)
ns.AddBuiltinFn("edit:", "-narrow-read", n.NarrowRead)
}
type narrowState struct {
name string
selected int
filter string
pagesize int
headerWidth int
placehold string
source func() []narrowItem
action func(*editor, narrowItem)
match func(string, string) bool
filtered []narrowItem
opts narrowOptions
}
func (l *narrow) Teardown() {
l.narrowState = narrowState{}
}
func (l *narrow) Binding(k ui.Key) eval.Callable {
if l.opts.bindingMap != nil {
if f, ok := l.opts.bindingMap[k]; ok {
return f
}
}
return l.binding.GetOrDefault(k)
}
func (l *narrowState) ModeLine() ui.Renderer {
ml := l.opts.Modeline
var opt []string
if l.opts.AutoCommit {
opt = append(opt, "A")
}
if l.opts.IgnoreCase {
opt = append(opt, "C")
}
if l.opts.IgnoreDuplication {
opt = append(opt, "D")
}
if len(opt) != 0 {
ml += "[" + strings.Join(opt, " ") + "]"
}
return ui.NewModeLineRenderer(ml, l.filter)
}
func (l *narrowState) CursorOnModeLine() bool {
return true
}
func (l *narrowState) List(maxHeight int) ui.Renderer {
if l.opts.MaxLines > 0 && l.opts.MaxLines < maxHeight {
maxHeight = l.opts.MaxLines
}
if l.filtered == nil {
l.refresh()
}
n := len(l.filtered)
if n == 0 {
return placeholderRenderer(l.placehold)
}
// Collect the entries to show. We start from the selected entry and extend
// in both directions alternatingly. The entries are split into lines and
// then collected in a list.
low := l.selected
if low == -1 {
low = 0
}
high := low
height := 0
var listOfLines list.List
getEntry := func(i int) []ui.Styled {
display := l.filtered[i].Display()
lines := strings.Split(display.Text, "\n")
styles := display.Styles
if i == l.selected {
styles = append(styles, styleForSelected...)
}
styleds := make([]ui.Styled, len(lines))
for i, line := range lines {
styleds[i] = ui.Styled{line, styles}
}
return styleds
}
// We start by extending high, so that the first entry to include is
// l.selected.
extendLow := false
lastShownIncomplete := false
for height < maxHeight && !(low == 0 && high == n) {
var i int
if (extendLow && low > 0) || high == n {
low--
entry := getEntry(low)
// Prepend at most the last (height - maxHeight) lines.
for i = len(entry) - 1; i >= 0 && height < maxHeight; i-- {
listOfLines.PushFront(entry[i])
height++
}
if i >= 0 {
lastShownIncomplete = true
}
} else {
entry := getEntry(high)
// Append at most the first (height - maxHeight) lines.
for i = 0; i < len(entry) && height < maxHeight; i++ {
listOfLines.PushBack(entry[i])
height++
}
if i < len(entry) {
lastShownIncomplete = true
}
high++
}
extendLow = !extendLow
}
l.pagesize = high - low
// Convert the List to a slice.
lines := make([]ui.Styled, 0, listOfLines.Len())
for p := listOfLines.Front(); p != nil; p = p.Next() {
lines = append(lines, p.Value.(ui.Styled))
}
ls := listingRenderer{lines}
if low > 0 || high < n || lastShownIncomplete {
// Need scrollbar
return listingWithScrollBarRenderer{ls, n, low, high, height}
}
return ls
}
func (l *narrowState) refresh() {
var candidates []narrowItem
if l.source != nil {
candidates = l.source()
}
l.filtered = make([]narrowItem, 0, len(candidates))
filter := l.filter
if l.opts.IgnoreCase {
filter = strings.ToLower(filter)
}
set := make(map[string]struct{})
for _, item := range candidates {
text := item.FilterText()
s := text
if l.opts.IgnoreCase {
s = strings.ToLower(s)
}
if !l.match(s, filter) {
continue
}
if l.opts.IgnoreDuplication {
if _, ok := set[text]; ok {
continue
}
set[text] = struct{}{}
}
l.filtered = append(l.filtered, item)
}
if l.opts.KeepBottom {
l.selected = len(l.filtered) - 1
} else {
l.selected = 0
}
}
func (l *narrowState) changeFilter(newfilter string) {
l.filter = newfilter
l.refresh()
}
func (l *narrowState) backspace() bool {
_, size := utf8.DecodeLastRuneInString(l.filter)
if size > 0 {
l.changeFilter(l.filter[:len(l.filter)-size])
return true
}
return false
}
func (l *narrowState) up(cycle bool) {
n := len(l.filtered)
if n == 0 {
return
}
l.selected--
if l.selected == -1 {
if cycle {
l.selected += n
} else {
l.selected++
}
}
}
func (l *narrowState) pageUp() {
n := len(l.filtered)
if n == 0 {
return
}
l.selected -= l.pagesize
if l.selected < 0 {
l.selected = 0
}
}
func (l *narrowState) down(cycle bool) {
n := len(l.filtered)
if n == 0 {
return
}
l.selected++
if l.selected == n {
if cycle {
l.selected -= n
} else {
l.selected--
}
}
}
func (l *narrowState) pageDown() {
n := len(l.filtered)
if n == 0 {
return
}
l.selected += l.pagesize
if l.selected >= n {
l.selected = n - 1
}
}
func (l *narrowState) accept(ed *editor) {
if l.selected >= 0 {
l.action(ed, l.filtered[l.selected])
}
}
func (l *narrowState) handleFilterKey(ed *editor) bool {
k := ed.lastKey
if likeChar(k) {
l.changeFilter(l.filter + string(k.Rune))
if len(l.filtered) == 1 && l.opts.AutoCommit {
l.accept(ed)
ed.SetModeInsert()
}
return true
}
return false
}
func (l *narrowState) defaultBinding(ed *editor) {
if !l.handleFilterKey(ed) {
ed.SetModeInsert()
ed.SetAction(reprocessKey)
}
}
type narrowItem interface {
Display() ui.Styled
Content() string
FilterText() string
}
type narrowOptions struct {
AutoCommit bool
Bindings hashmap.Map
IgnoreDuplication bool
IgnoreCase bool
KeepBottom bool
MaxLines int
Modeline string
bindingMap map[ui.Key]eval.Callable
}
type narrowItemString struct {
String string
}
func (s *narrowItemString) Content() string {
return s.String
}
func (s *narrowItemString) Display() ui.Styled {
return ui.Unstyled(s.String)
}
func (s *narrowItemString) FilterText() string {
return s.Content()
}
type narrowItemComplex struct {
hashmap.Map
}
func (c *narrowItemComplex) Content() string {
if v, ok := c.Map.Index("content"); ok {
if s, ok := v.(string); ok {
return s
}
}
return ""
}
// TODO: add style
func (c *narrowItemComplex) Display() ui.Styled {
if v, ok := c.Map.Index("display"); ok {
if s, ok := v.(string); ok {
return ui.Unstyled(s)
}
}
return ui.Unstyled("")
}
func (c *narrowItemComplex) FilterText() string {
if v, ok := c.Map.Index("filter-text"); ok {
if s, ok := v.(string); ok {
return s
}
}
return c.Content()
}
func (n *narrow) NarrowRead(fm *eval.Frame, opts eval.RawOptions, source, action eval.Callable) {
l := &narrowState{
opts: narrowOptions{
Bindings: vals.EmptyMap,
},
}
opts.Scan(&l.opts)
for it := l.opts.Bindings.Iterator(); it.HasElem(); it.Next() {
k, v := it.Elem()
key := ui.ToKey(k)
val, ok := v.(eval.Callable)
if !ok {
throwf("should be fn")
}
if l.opts.bindingMap == nil {
l.opts.bindingMap = make(map[ui.Key]eval.Callable)
}
l.opts.bindingMap[key] = val
}
l.source = narrowGetSource(fm, source)
l.action = func(ed *editor, item narrowItem) {
ed.CallFn(action, item)
}
// TODO: user customize varible
l.match = strings.Contains
l.changeFilter("")
n.narrowState = *l
fm.Editor.(*editor).SetMode(n)
}
func narrowGetSource(ec *eval.Frame, source eval.Callable) func() []narrowItem {
return func() []narrowItem {
ed := ec.Editor.(*editor)
vs, err := ec.CaptureOutput(source, eval.NoArgs, eval.NoOpts)
if err != nil {
ed.Notify(err.Error())
return nil
}
var lis []narrowItem
for _, v := range vs {
switch raw := v.(type) {
case string:
lis = append(lis, &narrowItemString{raw})
case hashmap.Map:
lis = append(lis, &narrowItemComplex{raw})
}
}
return lis
}
}
func (ed *editor) replaceInput(text string) {
ed.buffer = text
}
func wordifyBuiltin(fm *eval.Frame, text string) {
out := fm.OutputChan()
for _, s := range parseutil.Wordify(text) {
out <- s
}
}