The package was created before Go introduced their own "errors" package. Trade the better juju errors semantic for a smaller dependency tree.
181 lines
4.5 KiB
Go
181 lines
4.5 KiB
Go
package format
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import (
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"context"
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"errors"
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"fmt"
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"os/exec"
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"time"
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"github.com/charmbracelet/log"
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"github.com/gobwas/glob"
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)
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// ErrFormatterNotFound is returned when the Command for a Formatter is not available.
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var ErrFormatterNotFound = errors.New("formatter not found")
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// Formatter represents a command which should be applied to a filesystem.
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type Formatter struct {
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// Command is the command invoke when applying this Formatter.
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Command string
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// Options are an optional list of args to be passed to Command.
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Options []string
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// Includes is a list of glob patterns used to determine whether this Formatter should be applied against a path.
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Includes []string
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// Excludes is an optional list of glob patterns used to exclude certain files from this Formatter.
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Excludes []string
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name string
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log *log.Logger
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// internal compiled versions of Includes and Excludes.
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includes []glob.Glob
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excludes []glob.Glob
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// inbox is used to accept new paths for formatting.
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inbox chan string
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// Entries from inbox are batched according to batchSize and stored in batch for processing when the batchSize has
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// been reached or Close is invoked.
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batch []string
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batchSize int
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}
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func (f *Formatter) Init(name string) error {
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// capture the name from the config file
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f.name = name
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// test if the formatter is available
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if err := exec.Command(f.Command, "--help").Run(); err != nil {
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return ErrFormatterNotFound
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}
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// initialise internal state
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f.log = log.WithPrefix("format | " + name)
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f.batchSize = 1024
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f.inbox = make(chan string, f.batchSize)
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f.batch = make([]string, f.batchSize)
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f.batch = f.batch[:0]
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// todo refactor common code below
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if len(f.Includes) > 0 {
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for _, pattern := range f.Includes {
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g, err := glob.Compile("**/" + pattern)
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if err != nil {
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return fmt.Errorf("%w: failed to compile include pattern '%v' for formatter '%v'", err, pattern, f.name)
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}
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f.includes = append(f.includes, g)
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}
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}
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if len(f.Excludes) > 0 {
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for _, pattern := range f.Excludes {
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g, err := glob.Compile("**/" + pattern)
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if err != nil {
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return fmt.Errorf("%w: failed to compile exclude pattern '%v' for formatter '%v'", err, pattern, f.name)
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}
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f.excludes = append(f.excludes, g)
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}
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}
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return nil
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}
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// Wants is used to test if a Formatter wants path based on it's configured Includes and Excludes patterns.
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// Returns true if the Formatter should be applied to path, false otherwise.
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func (f *Formatter) Wants(path string) bool {
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match := !PathMatches(path, f.excludes) && PathMatches(path, f.includes)
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if match {
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f.log.Debugf("match: %v", path)
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}
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return match
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}
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// Put add path into this Formatter's inbox for processing.
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func (f *Formatter) Put(path string) {
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f.inbox <- path
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}
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// Run is the main processing loop for this Formatter.
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// It accepts a context which is used to lookup certain dependencies and for cancellation.
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func (f *Formatter) Run(ctx context.Context) (err error) {
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LOOP:
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// keep processing until ctx has been cancelled or inbox has been closed
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for {
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select {
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case <-ctx.Done():
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// ctx has been cancelled
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err = ctx.Err()
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break LOOP
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case path, ok := <-f.inbox:
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// check if the inbox has been closed
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if !ok {
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break LOOP
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}
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// add path to the current batch
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f.batch = append(f.batch, path)
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if len(f.batch) == f.batchSize {
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// drain immediately
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if err := f.apply(ctx); err != nil {
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break LOOP
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}
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}
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}
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}
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// check if LOOP was exited due to an error
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if err != nil {
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return
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}
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// processing any lingering batch
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return f.apply(ctx)
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}
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// apply executes Command against the latest batch of paths.
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// It accepts a context which is used to lookup certain dependencies and for cancellation.
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func (f *Formatter) apply(ctx context.Context) error {
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// empty check
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if len(f.batch) == 0 {
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return nil
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}
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// construct args, starting with config
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args := f.Options
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// append each file path
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for _, path := range f.batch {
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args = append(args, path)
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}
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// execute
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start := time.Now()
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cmd := exec.CommandContext(ctx, f.Command, args...)
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if _, err := cmd.CombinedOutput(); err != nil {
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// todo log output
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return err
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}
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f.log.Infof("%v files processed in %v", len(f.batch), time.Now().Sub(start))
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// mark each path in this batch as completed
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for _, path := range f.batch {
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MarkFormatComplete(ctx, path)
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}
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// reset batch
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f.batch = f.batch[:0]
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return nil
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}
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// Close is used to indicate that a Formatter should process any remaining paths and then stop it's processing loop.
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func (f *Formatter) Close() {
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close(f.inbox)
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}
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