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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package fmtcmd implements the “go fmt” command.
package fmtcmd
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"cmd/go/internal/base"
"cmd/go/internal/cfg"
"cmd/go/internal/load"
"cmd/go/internal/modload"
"cmd/internal/sys"
)
func init() {
base.AddBuildFlagsNX(&CmdFmt.Flag)
base.AddChdirFlag(&CmdFmt.Flag)
base.AddModFlag(&CmdFmt.Flag)
base.AddModCommonFlags(&CmdFmt.Flag)
}
var CmdFmt = &base.Command{
Run: runFmt,
UsageLine: "go fmt [-n] [-x] [packages]",
Short: "gofmt (reformat) package sources",
Long: `
Fmt runs the command 'gofmt -l -w' on the packages named
by the import paths. It prints the names of the files that are modified.
For more about gofmt, see 'go doc cmd/gofmt'.
For more about specifying packages, see 'go help packages'.
The -n flag prints commands that would be executed.
The -x flag prints commands as they are executed.
The -mod flag's value sets which module download mode
to use: readonly or vendor. See 'go help modules' for more.
To run gofmt with specific options, run gofmt itself.
See also: go fix, go vet.
`,
}
func runFmt(ctx context.Context, cmd *base.Command, args []string) {
printed := false
gofmt := gofmtPath()
gofmtArgs := []string{gofmt, "-l", "-w"}
gofmtArgLen := len(gofmt) + len(" -l -w")
baseGofmtArgs := len(gofmtArgs)
baseGofmtArgLen := gofmtArgLen
for _, pkg := range load.PackagesAndErrors(ctx, load.PackageOpts{}, args) {
if modload.Enabled() && pkg.Module != nil && !pkg.Module.Main {
if !printed {
fmt.Fprintf(os.Stderr, "go: not formatting packages in dependency modules\n")
printed = true
}
continue
}
if pkg.Error != nil {
var nogo *load.NoGoError
var embed *load.EmbedError
if (errors.As(pkg.Error, &nogo) || errors.As(pkg.Error, &embed)) && len(pkg.InternalAllGoFiles()) > 0 {
// Skip this error, as we will format
// all files regardless.
} else {
base.Errorf("%v", pkg.Error)
continue
}
}
// Use pkg.gofiles instead of pkg.Dir so that
// the command only applies to this package,
// not to packages in subdirectories.
files := base.RelPaths(pkg.InternalAllGoFiles())
for _, file := range files {
gofmtArgs = append(gofmtArgs, file)
gofmtArgLen += 1 + len(file) // plus separator
if gofmtArgLen >= sys.ExecArgLengthLimit {
base.Run(gofmtArgs)
gofmtArgs = gofmtArgs[:baseGofmtArgs]
gofmtArgLen = baseGofmtArgLen
}
}
}
if len(gofmtArgs) > baseGofmtArgs {
base.Run(gofmtArgs)
}
}
func gofmtPath() string {
gofmt := "gofmt" + cfg.ToolExeSuffix()
gofmtPath := filepath.Join(cfg.GOBIN, gofmt)
if _, err := os.Stat(gofmtPath); err == nil {
return gofmtPath
}
gofmtPath = filepath.Join(cfg.GOROOT, "bin", gofmt)
if _, err := os.Stat(gofmtPath); err == nil {
return gofmtPath
}
// fallback to looking for gofmt in $PATH
return "gofmt"
}
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