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Set bpmodify usage function

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golang `flag` package's default FlagSet `flag.CommandLine` calls
`flag.Usage` and `os.Exit(2)` on error to print the usage string.
Set `flag.Usage` to our custom usage function.

Test: m bpmodify; bpmodify -h; bpmodify --help
Change-Id: Ida107b0dbb07c291c3d7ea90eda9147d04a7cd51
This commit is contained in:
Yo Chiang 2020-03-03 15:42:52 +08:00
parent 03d3ee51f6
commit 3edfbc214a
1 changed files with 2 additions and 2 deletions
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4
bpmodify/bpmodify.go
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@ -36,6 +36,7 @@ func init() {
flag.Var(targetedModules, "m", "comma or whitespace separated list of modules on which to operate") flag.Var(targetedModules, "m", "comma or whitespace separated list of modules on which to operate")
flag.Var(addIdents, "a", "comma or whitespace separated list of identifiers to add") flag.Var(addIdents, "a", "comma or whitespace separated list of identifiers to add")
flag.Var(removeIdents, "r", "comma or whitespace separated list of identifiers to remove") flag.Var(removeIdents, "r", "comma or whitespace separated list of identifiers to remove")
flag.Usage = usage
} }
var ( var (
@ -48,9 +49,8 @@ func report(err error) {
} }
func usage() { func usage() {
fmt.Fprintln(os.Stderr, "usage: bpmodify [flags] [path ...]") fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [flags] [path ...]\n", os.Args[0])
flag.PrintDefaults() flag.PrintDefaults()
os.Exit(2)
} }
// If in == nil, the source is the contents of the file with the given filename. // If in == nil, the source is the contents of the file with the given filename.