fzf/src/core.go

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/*
Package fzf implements fzf, a command-line fuzzy finder.
The MIT License (MIT)
Copyright (c) 2015 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"
"runtime"
"time"
)
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const COORDINATOR_DELAY_MAX time.Duration = 100 * time.Millisecond
const COORDINATOR_DELAY_STEP time.Duration = 10 * time.Millisecond
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func initProcs() {
runtime.GOMAXPROCS(runtime.NumCPU())
}
/*
Reader -> EVT_READ_FIN
Reader -> EVT_READ_NEW -> Matcher (restart)
Terminal -> EVT_SEARCH_NEW -> Matcher (restart)
Matcher -> EVT_SEARCH_PROGRESS -> Terminal (update info)
Matcher -> EVT_SEARCH_FIN -> Terminal (update list)
*/
func Run(options *Options) {
initProcs()
opts := ParseOptions()
if opts.Version {
fmt.Println(VERSION)
os.Exit(0)
}
// Event channel
eventBox := NewEventBox()
// Chunk list
var chunkList *ChunkList
if len(opts.WithNth) == 0 {
chunkList = NewChunkList(func(data *string, index int) *Item {
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return &Item{text: data, rank: Rank{0, 0, uint32(index)}}
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})
} else {
chunkList = NewChunkList(func(data *string, index int) *Item {
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tokens := Tokenize(data, opts.Delimiter)
item := Item{
text: Transform(tokens, opts.WithNth).whole,
origText: data,
rank: Rank{0, 0, uint32(index)}}
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return &item
})
}
// Reader
reader := Reader{func(str string) { chunkList.Push(str) }, eventBox}
go reader.ReadSource()
// Matcher
patternBuilder := func(runes []rune) *Pattern {
return BuildPattern(
opts.Mode, opts.Case, opts.Nth, opts.Delimiter, runes)
}
matcher := NewMatcher(patternBuilder, opts.Sort > 0, eventBox)
// Defered-interactive / Non-interactive
// --select-1 | --exit-0 | --filter
if filtering := opts.Filter != nil; filtering || opts.Select1 || opts.Exit0 {
limit := 0
var patternString string
if filtering {
patternString = *opts.Filter
} else {
if opts.Select1 || opts.Exit0 {
limit = 1
}
patternString = opts.Query
}
pattern := patternBuilder([]rune(patternString))
looping := true
eventBox.Unwatch(EVT_READ_NEW)
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for looping {
eventBox.Wait(func(events *Events) {
for evt, _ := range *events {
switch evt {
case EVT_READ_FIN:
looping = false
return
}
}
})
}
snapshot, _ := chunkList.Snapshot()
merger, cancelled := matcher.scan(MatchRequest{
chunks: snapshot,
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pattern: pattern}, limit)
if !cancelled && (filtering ||
opts.Exit0 && merger.Length() == 0 ||
opts.Select1 && merger.Length() == 1) {
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if opts.PrintQuery {
fmt.Println(patternString)
}
for i := 0; i < merger.Length(); i++ {
merger.Get(i).Print()
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}
os.Exit(0)
}
}
// Go interactive
go matcher.Loop()
// Terminal I/O
terminal := NewTerminal(opts, eventBox)
go terminal.Loop()
// Event coordination
reading := true
ticks := 0
eventBox.Watch(EVT_READ_NEW)
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for {
delay := true
ticks += 1
eventBox.Wait(func(events *Events) {
defer events.Clear()
for evt, value := range *events {
switch evt {
case EVT_READ_NEW, EVT_READ_FIN:
reading = reading && evt == EVT_READ_NEW
snapshot, count := chunkList.Snapshot()
terminal.UpdateCount(count, !reading)
matcher.Reset(snapshot, terminal.Input(), false)
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case EVT_SEARCH_NEW:
snapshot, _ := chunkList.Snapshot()
matcher.Reset(snapshot, terminal.Input(), true)
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delay = false
case EVT_SEARCH_PROGRESS:
switch val := value.(type) {
case float32:
terminal.UpdateProgress(val)
}
case EVT_SEARCH_FIN:
switch val := value.(type) {
case *Merger:
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terminal.UpdateList(val)
}
}
}
})
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if delay && reading {
dur := DurWithin(
time.Duration(ticks)*COORDINATOR_DELAY_STEP,
0, COORDINATOR_DELAY_MAX)
time.Sleep(dur)
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}
}
}