/
format.go
94 lines (84 loc) · 2.19 KB
/
format.go
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// Copyright 2020 Silvio Böhler
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package format
import (
"bufio"
"io"
"io/ioutil"
"os"
"path"
"github.com/spf13/cobra"
"go.uber.org/multierr"
"github.com/sboehler/knut/lib/format"
"github.com/sboehler/knut/lib/model"
"github.com/sboehler/knut/lib/parser"
)
// CreateCmd creates the command.
func CreateCmd() *cobra.Command {
return &cobra.Command{
Use: "format",
Short: "Format the given journal",
Long: `Format the given journal in-place. Any white space and comments between directives is preserved.`,
RunE: run,
}
}
type directive interface {
io.WriterTo
Position() model.Range
}
const concurrency = 10
func run(cmd *cobra.Command, args []string) (errors error) {
errCh := make(chan error)
defer close(errCh)
go func() {
for err := range errCh {
errors = multierr.Append(errors, err)
}
}()
sema := make(chan bool, concurrency)
for _, arg := range args {
sema <- true
go func(target string) {
defer func() { <-sema }()
if err := formatFile(target); err != nil {
errCh <- err
}
}(arg)
}
for i := 0; i < concurrency; i++ {
sema <- true
}
return nil
}
func formatFile(target string) error {
ch, err := parser.ParseOneFile(target)
if err != nil {
return err
}
srcFile, err := os.Open(target)
if err != nil {
return err
}
src := bufio.NewReader(srcFile)
tmpfile, err := ioutil.TempFile(path.Dir(target), "-format")
if err != nil {
return err
}
dest := bufio.NewWriter(tmpfile)
err = format.Format(ch, src, dest)
if err = multierr.Combine(err, dest.Flush(), srcFile.Close()); err != nil {
return multierr.Append(err, os.Remove(tmpfile.Name()))
}
return os.Rename(tmpfile.Name(), target)
}