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go.tools/cmd/cover: better usage message 

R=adg, rsc
CC=golang-dev
https://golang.org/cl/10453044
This commit is contained in:
Rob Pike 2013-06-24 12:56:25 -07:00
parent c13bb422de
commit 40caf1ff72
1 changed files with 24 additions and 14 deletions
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38
cmd/cover/cover.go
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@ -36,15 +36,14 @@ import (
// is used primarily by the go tool.
var (
mode = flag.String("mode", "set", "coverage mode: set, count, atomic")
varVar = flag.String("var", "GoCover", "name of generated coverage variable")
output = flag.String("o", "", "file for output; standard output by default")
htmlOut = flag.Bool("html", false, "output HTML")
inProfile = flag.String("profile", "", "input profile data for HTML generation")
mode = flag.String("mode", "", "coverage mode: set, count, atomic")
varVar = flag.String("var", "GoCover", "name of coverage variable to generate")
output = flag.String("o", "", "file for output (static HTML or annotated Go source); default: stdout")
htmlOut = flag.String("html", "", "generate HTML representation of coverage profile")
)
var profile string // The profile to read; the value of -html but stored separately for future flexibility.
var counterStmt func(*File, ast.Expr) ast.Stmt
const (
@ -53,21 +52,32 @@ const (
)
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s [options] onefile.go\n", os.Args[0])
fmt.Fprintf(os.Stderr, "Usage:\n")
fmt.Fprintf(os.Stderr, " To display annotated source given a coverage profile produced by 'go test -coverprofile=c.out':\n")
fmt.Fprintf(os.Stderr, " go tool cover -html=c.out\n")
fmt.Fprintf(os.Stderr, " To generate modified source code with coverage annotations (what go test -cover does):\n")
fmt.Fprintf(os.Stderr, " go tool cover -mode=set -var=CoverageVariableName program.go\n")
fmt.Fprintf(os.Stderr, "Flags:\n")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
flag.Usage = usage
flag.Parse()
profile = *htmlOut
if *htmlOut {
if *inProfile == "" {
fmt.Fprintln(os.Stderr, "cover: must specify -profile with -html")
// Must either display a profile or rewrite Go source.
if (profile == "") == (*mode == "") {
flag.Usage()
}
// Generate HTML.
if *htmlOut != "" {
if flag.NArg() != 0 {
flag.Usage()
os.Exit(2)
}
err := htmlOutput(*inProfile, *output)
err := htmlOutput(profile, *output)
if err != nil {
fmt.Fprintf(os.Stderr, "cover: %v\n", err)
os.Exit(2)
@ -75,6 +85,7 @@ func main() {
return
}
// Generate coverage-annotated source.
switch *mode {
case "set":
counterStmt = setCounterStmt
@ -84,7 +95,6 @@ func main() {
counterStmt = atomicCounterStmt
default:
flag.Usage()
os.Exit(2)
}
if flag.NArg() != 1 {
flag.Usage()