fzf/src/core.go

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/*
Package fzf implements fzf, a command-line fuzzy finder.
The MIT License (MIT)
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Copyright (c) 2017 Junegunn Choi
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
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package fzf
import (
"fmt"
"os"
"time"
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"github.com/junegunn/fzf/src/util"
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)
/*
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Reader -> EvtReadFin
Reader -> EvtReadNew -> Matcher (restart)
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Terminal -> EvtSearchNew:bool -> Matcher (restart)
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Matcher -> EvtSearchProgress -> Terminal (update info)
Matcher -> EvtSearchFin -> Terminal (update list)
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Matcher -> EvtHeader -> Terminal (update header)
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*/
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// Run starts fzf
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func Run(opts *Options, revision string) {
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sort := opts.Sort > 0
sortCriteria = opts.Criteria
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if opts.Version {
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if len(revision) > 0 {
fmt.Printf("%s (%s)\n", version, revision)
} else {
fmt.Println(version)
}
os.Exit(exitOk)
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}
// Event channel
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eventBox := util.NewEventBox()
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// ANSI code processor
ansiProcessor := func(data []byte) (util.Chars, *[]ansiOffset) {
return util.ToChars(data), nil
}
var lineAnsiState, prevLineAnsiState *ansiState
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if opts.Ansi {
if opts.Theme != nil {
ansiProcessor = func(data []byte) (util.Chars, *[]ansiOffset) {
prevLineAnsiState = lineAnsiState
trimmed, offsets, newState := extractColor(string(data), lineAnsiState, nil)
lineAnsiState = newState
return util.ToChars([]byte(trimmed)), offsets
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}
} else {
// When color is disabled but ansi option is given,
// we simply strip out ANSI codes from the input
ansiProcessor = func(data []byte) (util.Chars, *[]ansiOffset) {
trimmed, _, _ := extractColor(string(data), nil, nil)
return util.ToChars([]byte(trimmed)), nil
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}
}
}
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// Chunk list
var chunkList *ChunkList
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var itemIndex int32
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header := make([]string, 0, opts.HeaderLines)
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if len(opts.WithNth) == 0 {
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chunkList = NewChunkList(func(item *Item, data []byte) bool {
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if len(header) < opts.HeaderLines {
header = append(header, string(data))
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eventBox.Set(EvtHeader, header)
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return false
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}
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item.text, item.colors = ansiProcessor(data)
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item.text.Index = itemIndex
itemIndex++
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return true
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})
} else {
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chunkList = NewChunkList(func(item *Item, data []byte) bool {
tokens := Tokenize(string(data), opts.Delimiter)
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if opts.Ansi && opts.Theme != nil && len(tokens) > 1 {
var ansiState *ansiState
if prevLineAnsiState != nil {
ansiStateDup := *prevLineAnsiState
ansiState = &ansiStateDup
}
for _, token := range tokens {
prevAnsiState := ansiState
_, _, ansiState = extractColor(token.text.ToString(), ansiState, nil)
if prevAnsiState != nil {
token.text.Prepend("\x1b[m" + prevAnsiState.ToString())
} else {
token.text.Prepend("\x1b[m")
}
}
}
trans := Transform(tokens, opts.WithNth)
transformed := joinTokens(trans)
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if len(header) < opts.HeaderLines {
header = append(header, transformed)
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eventBox.Set(EvtHeader, header)
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return false
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}
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item.text, item.colors = ansiProcessor([]byte(transformed))
item.text.TrimTrailingWhitespaces()
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item.text.Index = itemIndex
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item.origText = &data
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itemIndex++
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return true
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})
}
// Reader
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streamingFilter := opts.Filter != nil && !sort && !opts.Tac && !opts.Sync
var reader *Reader
if !streamingFilter {
reader = NewReader(func(data []byte) bool {
return chunkList.Push(data)
}, eventBox, opts.ReadZero, opts.Filter == nil)
go reader.ReadSource()
}
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// Matcher
forward := true
for _, cri := range opts.Criteria[1:] {
if cri == byEnd {
forward = false
break
}
if cri == byBegin {
break
}
}
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patternBuilder := func(runes []rune) *Pattern {
return BuildPattern(
opts.Fuzzy, opts.FuzzyAlgo, opts.Extended, opts.Case, opts.Normalize, forward,
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opts.Filter == nil, opts.Nth, opts.Delimiter, runes)
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}
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matcher := NewMatcher(patternBuilder, sort, opts.Tac, eventBox)
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// Filtering mode
if opts.Filter != nil {
if opts.PrintQuery {
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opts.Printer(*opts.Filter)
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}
pattern := patternBuilder([]rune(*opts.Filter))
matcher.sort = pattern.sortable
found := false
if streamingFilter {
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slab := util.MakeSlab(slab16Size, slab32Size)
reader := NewReader(
func(runes []byte) bool {
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item := Item{}
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if chunkList.trans(&item, runes) {
if result, _, _ := pattern.MatchItem(&item, false, slab); result != nil {
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opts.Printer(item.text.ToString())
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found = true
}
}
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return false
}, eventBox, opts.ReadZero, false)
reader.ReadSource()
} else {
eventBox.Unwatch(EvtReadNew)
eventBox.WaitFor(EvtReadFin)
snapshot, _ := chunkList.Snapshot()
merger, _ := matcher.scan(MatchRequest{
chunks: snapshot,
pattern: pattern})
for i := 0; i < merger.Length(); i++ {
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opts.Printer(merger.Get(i).item.AsString(opts.Ansi))
found = true
}
}
if found {
os.Exit(exitOk)
}
os.Exit(exitNoMatch)
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}
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// Synchronous search
if opts.Sync {
eventBox.Unwatch(EvtReadNew)
eventBox.WaitFor(EvtReadFin)
}
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// Go interactive
go matcher.Loop()
// Terminal I/O
terminal := NewTerminal(opts, eventBox)
deferred := opts.Select1 || opts.Exit0
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go terminal.Loop()
if !deferred {
terminal.startChan <- true
}
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// Event coordination
reading := true
ticks := 0
var nextCommand *string
restart := func(command string) {
reading = true
chunkList.Clear()
header = make([]string, 0, opts.HeaderLines)
go reader.restart(command)
}
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eventBox.Watch(EvtReadNew)
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for {
delay := true
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ticks++
input := func() []rune {
if opts.Phony {
return []rune{}
}
return []rune(terminal.Input())
}
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eventBox.Wait(func(events *util.Events) {
if _, fin := (*events)[EvtReadFin]; fin {
delete(*events, EvtReadNew)
}
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for evt, value := range *events {
switch evt {
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case EvtReadNew, EvtReadFin:
clearCache := false
if evt == EvtReadFin && nextCommand != nil {
clearCache = true
restart(*nextCommand)
nextCommand = nil
} else {
reading = reading && evt == EvtReadNew
}
snapshot, count := chunkList.Snapshot()
terminal.UpdateCount(count, !reading, value.(*string))
if opts.Sync {
terminal.UpdateList(PassMerger(&snapshot, opts.Tac))
}
matcher.Reset(snapshot, input(), false, !reading, sort, clearCache)
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case EvtSearchNew:
var command *string
switch val := value.(type) {
case searchRequest:
sort = val.sort
command = val.command
}
if command != nil {
if reading {
reader.terminate()
nextCommand = command
} else {
restart(*command)
}
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}
snapshot, _ := chunkList.Snapshot()
matcher.Reset(snapshot, input(), true, !reading, sort, command != nil)
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delay = false
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case EvtSearchProgress:
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switch val := value.(type) {
case float32:
terminal.UpdateProgress(val)
}
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case EvtHeader:
terminal.UpdateHeader(value.([]string))
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case EvtSearchFin:
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switch val := value.(type) {
case *Merger:
if deferred {
count := val.Length()
if opts.Select1 && count > 1 || opts.Exit0 && !opts.Select1 && count > 0 {
deferred = false
terminal.startChan <- true
} else if val.final {
if opts.Exit0 && count == 0 || opts.Select1 && count == 1 {
if opts.PrintQuery {
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opts.Printer(opts.Query)
}
if len(opts.Expect) > 0 {
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opts.Printer("")
}
for i := 0; i < count; i++ {
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opts.Printer(val.Get(i).item.AsString(opts.Ansi))
}
if count > 0 {
os.Exit(exitOk)
}
os.Exit(exitNoMatch)
}
deferred = false
terminal.startChan <- true
}
}
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terminal.UpdateList(val)
}
}
}
events.Clear()
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})
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if delay && reading {
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dur := util.DurWithin(
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time.Duration(ticks)*coordinatorDelayStep,
0, coordinatorDelayMax)
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time.Sleep(dur)
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}
}
}