332 lines
7.0 KiB
Go
332 lines
7.0 KiB
Go
package cli
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import (
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"bufio"
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"context"
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"errors"
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"fmt"
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"io/fs"
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"os"
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"os/signal"
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"path/filepath"
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"runtime"
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"slices"
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"strings"
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"syscall"
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"time"
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"git.numtide.com/numtide/treefmt/format"
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"github.com/gobwas/glob"
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"git.numtide.com/numtide/treefmt/cache"
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"git.numtide.com/numtide/treefmt/config"
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"git.numtide.com/numtide/treefmt/walk"
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"github.com/charmbracelet/log"
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"golang.org/x/sync/errgroup"
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)
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const (
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BatchSize = 1024
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)
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var (
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start time.Time
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globalExcludes []glob.Glob
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formatters map[string]*format.Formatter
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pipelines map[string]*format.Pipeline
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pathsCh chan string
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processedCh chan string
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ErrFailOnChange = errors.New("unexpected changes detected, --fail-on-change is enabled")
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)
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func (f *Format) Run() (err error) {
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start = time.Now()
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Cli.Configure()
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l := log.WithPrefix("format")
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defer func() {
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if err := cache.Close(); err != nil {
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l.Errorf("failed to close cache: %v", err)
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}
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}()
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// read config
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cfg, err := config.ReadFile(Cli.ConfigFile)
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if err != nil {
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return fmt.Errorf("%w: failed to read config file", err)
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}
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if globalExcludes, err = format.CompileGlobs(cfg.Global.Excludes); err != nil {
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return fmt.Errorf("%w: failed to compile global globs", err)
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}
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pipelines = make(map[string]*format.Pipeline)
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formatters = make(map[string]*format.Formatter)
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// filter formatters
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if len(Cli.Formatters) > 0 {
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// first check the cli formatter list is valid
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for _, name := range Cli.Formatters {
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_, ok := cfg.Formatters[name]
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if !ok {
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return fmt.Errorf("formatter not found in config: %v", name)
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}
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}
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// next we remove any formatter configs that were not specified
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for name := range cfg.Formatters {
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if !slices.Contains(Cli.Formatters, name) {
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delete(cfg.Formatters, name)
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}
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}
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}
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// init formatters
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for name, formatterCfg := range cfg.Formatters {
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formatter, err := format.NewFormatter(name, Cli.TreeRoot, formatterCfg, globalExcludes)
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if errors.Is(err, format.ErrCommandNotFound) && Cli.AllowMissingFormatter {
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l.Debugf("formatter not found: %v", name)
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continue
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} else if err != nil {
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return fmt.Errorf("%w: failed to initialise formatter: %v", err, name)
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}
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formatters[name] = formatter
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if formatterCfg.Pipeline == "" {
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pipeline := format.Pipeline{}
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pipeline.Add(formatter)
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pipelines[name] = &pipeline
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} else {
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key := fmt.Sprintf("p:%s", formatterCfg.Pipeline)
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pipeline, ok := pipelines[key]
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if !ok {
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pipeline = &format.Pipeline{}
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pipelines[key] = pipeline
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}
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pipeline.Add(formatter)
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}
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}
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// open the cache
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if err = cache.Open(Cli.TreeRoot, Cli.ClearCache, formatters); err != nil {
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return err
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}
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// create an app context and listen for shutdown
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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go func() {
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exit := make(chan os.Signal, 1)
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signal.Notify(exit, os.Interrupt, syscall.SIGTERM)
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<-exit
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cancel()
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}()
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// create some groups for concurrent processing and control flow
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eg, ctx := errgroup.WithContext(ctx)
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// create a channel for paths to be processed
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// we use a multiple of batch size here to allow for greater concurrency
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pathsCh = make(chan string, BatchSize*runtime.NumCPU())
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// create a channel for tracking paths that have been processed
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processedCh = make(chan string, cap(pathsCh))
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// start concurrent processing tasks
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eg.Go(updateCache(ctx))
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eg.Go(applyFormatters(ctx))
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eg.Go(walkFilesystem(ctx))
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// wait for everything to complete
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return eg.Wait()
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}
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func walkFilesystem(ctx context.Context) func() error {
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return func() error {
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paths := Cli.Paths
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if len(paths) == 0 && Cli.Stdin {
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cwd, err := os.Getwd()
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if err != nil {
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return fmt.Errorf("%w: failed to determine current working directory", err)
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}
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// read in all the paths
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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path := scanner.Text()
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if !strings.HasPrefix(path, "/") {
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// append the cwd
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path = filepath.Join(cwd, path)
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}
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paths = append(paths, path)
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}
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}
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walker, err := walk.New(Cli.Walk, Cli.TreeRoot, paths)
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if err != nil {
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return fmt.Errorf("failed to create walker: %w", err)
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}
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defer close(pathsCh)
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if Cli.NoCache {
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return walker.Walk(ctx, func(path string, info fs.FileInfo, err error) error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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// ignore symlinks and directories
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if !(info.IsDir() || info.Mode()&os.ModeSymlink == os.ModeSymlink) {
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pathsCh <- path
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}
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return nil
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}
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})
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}
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if err = cache.ChangeSet(ctx, walker, pathsCh); err != nil {
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return fmt.Errorf("failed to generate change set: %w", err)
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}
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return nil
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}
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}
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func updateCache(ctx context.Context) func() error {
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return func() error {
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batch := make([]string, 0, BatchSize)
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var changes int
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processBatch := func() error {
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if Cli.NoCache {
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changes += len(batch)
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} else {
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count, err := cache.Update(Cli.TreeRoot, batch)
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if err != nil {
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return err
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}
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changes += count
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}
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batch = batch[:0]
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return nil
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}
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LOOP:
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case path, ok := <-processedCh:
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if !ok {
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break LOOP
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}
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batch = append(batch, path)
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if len(batch) == BatchSize {
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if err := processBatch(); err != nil {
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return err
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}
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}
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}
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}
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// final flush
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if err := processBatch(); err != nil {
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return err
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}
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if Cli.FailOnChange && changes != 0 {
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return ErrFailOnChange
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}
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fmt.Printf("%v files changed in %v\n", changes, time.Now().Sub(start))
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return nil
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}
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}
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func applyFormatters(ctx context.Context) func() error {
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fg, ctx := errgroup.WithContext(ctx)
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batches := make(map[string][]string)
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tryApply := func(key string, path string) {
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batch, ok := batches[key]
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if !ok {
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batch = make([]string, 0, BatchSize)
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}
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batch = append(batch, path)
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batches[key] = batch
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if len(batch) == BatchSize {
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pipeline := pipelines[key]
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// copy the batch
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paths := make([]string, len(batch))
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copy(paths, batch)
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fg.Go(func() error {
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if err := pipeline.Apply(ctx, paths); err != nil {
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return err
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}
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for _, path := range paths {
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processedCh <- path
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}
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return nil
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})
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batches[key] = batch[:0]
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}
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}
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flushBatches := func() {
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for key, pipeline := range pipelines {
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batch := batches[key]
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pipeline := pipeline // capture for closure
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if len(batch) > 0 {
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fg.Go(func() error {
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if err := pipeline.Apply(ctx, batch); err != nil {
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return fmt.Errorf("%s failure: %w", key, err)
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}
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for _, path := range batch {
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processedCh <- path
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}
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return nil
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})
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}
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}
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}
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return func() error {
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defer func() {
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// close processed channel
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close(processedCh)
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}()
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for path := range pathsCh {
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for key, pipeline := range pipelines {
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if !pipeline.Wants(path) {
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continue
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}
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tryApply(key, path)
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}
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}
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// flush any partial batches which remain
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flushBatches()
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// wait for all outstanding formatting tasks to complete
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if err := fg.Wait(); err != nil {
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return fmt.Errorf("pipeline processing failure: %w", err)
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}
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return nil
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}
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}
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