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|
package exec
import (
"context"
"flag"
"fmt"
"os"
"os/exec"
"path/filepath"
"syscall"
"time"
"github.com/google/subcommands"
"github.com/loov/goda/internal/memory"
"github.com/loov/goda/internal/templates"
)
type Command struct {
format string
}
func (*Command) Name() string { return "exec" }
func (*Command) Synopsis() string { return "Run command with extended statistics." }
func (*Command) Usage() string {
return `calc <command>:
Run command with extended statistics.
Example:
go build -toolexec "goda exec" .
`
}
func (cmd *Command) SetFlags(f *flag.FlagSet) {
f.StringVar(&cmd.format, "f", "{{.Command}} {{.PackageName}} user:{{.UserTime}} system:{{.SystemTime}} in:{{.InputsSize}} out:{{.OutputSize}}", "formatting")
}
func (cmd *Command) Execute(ctx context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {
if f.NArg() == 0 {
return subcommands.ExitSuccess
}
args := f.Args()
t, err := templates.Parse(cmd.format)
if err != nil {
fmt.Fprintf(os.Stderr, "invalid format string: %v\n", err)
return subcommands.ExitFailure
}
command := exec.CommandContext(ctx, args[0], args[1:]...)
command.Stdin, command.Stdout, command.Stderr = os.Stdin, os.Stdout, os.Stderr
var info Info
startError := command.Start()
if startError != nil {
fmt.Fprintf(os.Stderr, "failed to start: %v\n", startError)
return subcommands.ExitFailure
}
info.Start = time.Now()
exitError := command.Wait()
info.Finish = time.Now()
if command.ProcessState != nil {
info.UserTime = command.ProcessState.UserTime()
info.SystemTime = command.ProcessState.SystemTime()
}
ParseArgs(&info, args)
err = t.Execute(os.Stdout, &info)
if err != nil {
fmt.Fprintf(os.Stderr, "template error: %v\n", err)
}
fmt.Fprintln(os.Stdout)
if exitError != nil {
if err, ok := exitError.(*exec.ExitError); ok {
if status, ok := err.Sys().(syscall.WaitStatus); ok {
return subcommands.ExitStatus(status.ExitStatus())
}
}
fmt.Fprintf(os.Stderr, "failed to run: %v\n", exitError)
return subcommands.ExitFailure
}
return subcommands.ExitSuccess
}
type Info struct {
Command string
PackageName string
Args []string
Output string
OutputSize memory.Bytes
Inputs []string
InputsSize memory.Bytes
Start time.Time
Finish time.Time
UserTime time.Duration
SystemTime time.Duration
}
func ParseArgs(info *Info, args []string) {
cmdname := filepath.Base(args[0])
ext := filepath.Ext(cmdname)
info.Command = cmdname[:len(cmdname)-len(ext)]
for i := 1; i < len(args); i++ {
switch args[i] {
case "":
case "-I", "-D", "-trimpath":
i++
case "-o":
i++
if i < len(args) {
info.Output = args[i]
}
case "-p":
i++
if i < len(args) {
info.PackageName = args[i]
}
default:
// ignore flags
if args[i][0] == '-' {
continue
}
ext := filepath.Ext(args[i])
if ext == ".a" || ext == ".o" || ext == ".h" || ext == ".s" || ext == ".c" || ext == ".go" {
info.Inputs = append(info.Inputs, args[i])
}
}
}
//TODO: take into account $WORK variable
if info.Output != "" {
if stat, err := os.Lstat(info.Output); err == nil {
info.OutputSize = memory.Bytes(stat.Size())
}
}
for _, input := range info.Inputs {
if stat, err := os.Lstat(input); err == nil {
info.InputsSize += memory.Bytes(stat.Size())
}
}
}
|
