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main.go
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main.go
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package main
import (
"bytes"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"runtime/pprof"
"strings"
log "github.com/sirupsen/logrus"
prefixed "github.com/x-cray/logrus-prefixed-formatter"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
var (
// these values are provided automatically by Goreleaser
// ref: https://goreleaser.com/customization/builds/
version = "dev"
commit = "none"
date = "unknown"
// Flags
baseFormatterCmd = kingpin.Flag(
"base-formatter",
"Base formatter to use").Default("").String()
chainSplitDots = kingpin.Flag(
"chain-split-dots",
"Split chained methods on the dots as opposed to the arguments").
Default("true").Bool()
debug = kingpin.Flag(
"debug",
"Show debug output").Short('d').Default("false").Bool()
dotFile = kingpin.Flag(
"dot-file",
"Path to dot representation of AST graph").Default("").String()
dryRun = kingpin.Flag(
"dry-run",
"Show diffs without writing anything").Default("false").Bool()
ignoreGenerated = kingpin.Flag(
"ignore-generated",
"Ignore generated go files").Default("true").Bool()
ignoredDirs = kingpin.Flag(
"ignored-dirs",
"Directories to ignore").Default("vendor", "node_modules", ".git").Strings()
keepAnnotations = kingpin.Flag(
"keep-annotations",
"Keep shortening annotations in final output").Default("false").Bool()
listFiles = kingpin.Flag(
"list-files",
"List files that would be reformatted by this tool").Short('l').Default("false").Bool()
maxLen = kingpin.Flag(
"max-len",
"Target maximum line length").Short('m').Default("100").Int()
profile = kingpin.Flag(
"profile",
"Path to profile output").Default("").String()
reformatTags = kingpin.Flag(
"reformat-tags",
"Reformat struct tags").Default("true").Bool()
shortenComments = kingpin.Flag(
"shorten-comments",
"Shorten single-line comments").Default("false").Bool()
tabLen = kingpin.Flag(
"tab-len",
"Length of a tab").Short('t').Default("4").Int()
versionFlag = kingpin.Flag(
"version",
"Print out version and exit").Default("false").Bool()
writeOutput = kingpin.Flag(
"write-output",
"Write output to source instead of stdout").Short('w').Default("false").Bool()
// Args
paths = kingpin.Arg(
"paths",
"Paths to format",
).Strings()
)
func main() {
kingpin.Parse()
if *debug {
log.SetLevel(log.DebugLevel)
} else {
log.SetLevel(log.InfoLevel)
}
if *versionFlag {
fmt.Printf("golines v%s\n\nbuild information:\n\tbuild date: %s\n\tgit commit ref: %s\n",
version, date, commit)
return
}
if *profile != "" {
f, err := os.Create(*profile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
log.SetFormatter(&prefixed.TextFormatter{
TimestampFormat: "2006-01-02 15:04:05",
FullTimestamp: true,
ForceFormatting: true,
})
err := run()
if err != nil {
log.Fatal(err)
}
}
func run() error {
config := ShortenerConfig{
MaxLen: *maxLen,
TabLen: *tabLen,
KeepAnnotations: *keepAnnotations,
ShortenComments: *shortenComments,
ReformatTags: *reformatTags,
IgnoreGenerated: *ignoreGenerated,
DotFile: *dotFile,
BaseFormatterCmd: *baseFormatterCmd,
ChainSplitDots: *chainSplitDots,
}
shortener := NewShortener(config)
if len(*paths) == 0 {
// Read input from stdin
contents, err := io.ReadAll(os.Stdin)
if err != nil {
return err
}
result, err := shortener.Shorten(contents)
if err != nil {
return err
}
err = handleOutput("", contents, result)
if err != nil {
return err
}
} else {
// Read inputs from paths provided in arguments
for _, path := range *paths {
switch info, err := os.Stat(path); {
case err != nil:
return err
case info.IsDir():
// Path is a directory- walk it
err = filepath.Walk(
path,
func(subPath string, subInfo os.FileInfo, err error) error {
if err != nil {
return err
}
components := strings.Split(subPath, "/")
for _, component := range components {
for _, ignoredDir := range *ignoredDirs {
if component == ignoredDir {
return filepath.SkipDir
}
}
}
if !subInfo.IsDir() && strings.HasSuffix(subPath, ".go") {
// Shorten file and generate output
contents, result, err := processFile(shortener, subPath)
if err != nil {
return err
}
err = handleOutput(subPath, contents, result)
if err != nil {
return err
}
}
return nil
},
)
if err != nil {
return err
}
default:
// Path is a file
contents, result, err := processFile(shortener, path)
if err != nil {
return err
}
err = handleOutput(path, contents, result)
if err != nil {
return err
}
}
}
}
return nil
}
// processFile uses the provided Shortener instance to shorten the lines
// in a file. It returns the original contents (useful for debugging), the
// shortened version, and an error.
func processFile(shortener *Shortener, path string) ([]byte, []byte, error) {
_, fileName := filepath.Split(path)
if *ignoreGenerated && strings.HasPrefix(fileName, "generated_") {
return nil, nil, nil
}
log.Debugf("Processing file %s", path)
contents, err := os.ReadFile(path)
if err != nil {
return nil, nil, err
}
result, err := shortener.Shorten(contents)
return contents, result, err
}
// handleOutput generates output according to the value of the tool's
// flags; depending on the latter, the output might be written over
// the source file, printed to stdout, etc.
func handleOutput(path string, contents []byte, result []byte) error {
if contents == nil {
return nil
} else if *dryRun {
return PrettyDiff(path, contents, result)
} else if *listFiles {
if !bytes.Equal(contents, result) {
fmt.Println(path)
}
return nil
} else if *writeOutput {
if path == "" {
return errors.New("No path to write out to")
}
info, err := os.Stat(path)
if err != nil {
return err
}
if bytes.Equal(contents, result) {
log.Debugf("Contents unchanged, skipping write")
return nil
}
log.Debugf("Contents changed, writing output to %s", path)
return os.WriteFile(path, result, info.Mode())
}
fmt.Print(string(result))
return nil
}