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go.tools/cmd/cover: add -o outputfile option

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Makes it easier to get error output when run from the go tool.

R=adonovan
CC=golang-dev
https://golang.org/cl/10190043
This commit is contained in:
Rob Pike 2013-06-11 10:18:55 -07:00
parent 0d2f7d411b
commit 0ca15cc618
1 changed files with 21 additions and 17 deletions
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28
cmd/cover/cover.go
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@ -30,8 +30,10 @@ import (
var (
mode = flag.String("mode", "set", "coverage mode: set, count, atomic")
countVar = flag.String("count", "__count", "name of coverage count array variable")
posVar = flag.String("pos", "__pos", "name of coverage count position variable")
countVar = flag.String("count", "GoCoverCount", "name of coverage count array variable")
posVar = flag.String("pos", "GoCoverPos", "name of coverage position array variable")
output = flag.String("o", "", "file for output; standard output by default")
)
var counterStmt func(*File, ast.Expr) ast.Stmt
@ -42,7 +44,7 @@ const (
)
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s [options] file\n", os.Args[0])
fmt.Fprintf(os.Stderr, "Usage: %s [options] onefile.go\n", os.Args[0])
flag.PrintDefaults()
os.Exit(2)
}
@ -183,8 +185,6 @@ func (f *File) addImport(path string) string {
}
func cover(name string) {
var files []*File
var astFiles []*ast.File
fs := token.NewFileSet()
f, err := os.Open(name)
if err != nil {
@ -199,23 +199,27 @@ func cover(name string) {
if err != nil {
log.Fatalf("cover: %s: %s", name, err)
}
thisFile := &File{
file := &File{
fset: fs,
name: name,
astFile: parsedFile,
}
files = append(files, thisFile)
astFiles = append(astFiles, parsedFile)
for _, file := range files {
if *mode == "atomic" {
file.atomicPkg = file.addImport(atomicPackagePath)
}
ast.Walk(file, file.astFile)
file.print(os.Stdout)
fd := os.Stdout
if *output != "" {
var err error
fd, err = os.Create(*output)
if err != nil {
log.Fatalf("cover: %s", err)
}
}
file.print(fd)
// After printing the source tree, add some declarations for the counters etc.
// We could do this by adding to the tree, but it's easier just to print the text.
file.addVariables(os.Stdout)
}
file.addVariables(fd)
}
func (f *File) print(w io.Writer) {