6b9becd994
- Options.Args holds the command-line arguments; FromGlobals fills it from os.Args[1:], so the generated main needs no change - Bootstrap and Setup install the setup with Quiet when Args only ask for help (-h, --help) and no -v is given; files keep their levels - TestBootQuietSmoke runs the generated main's sequence with a plugin that logs from Register and Boot
56 lines
1.7 KiB
Go
56 lines
1.7 KiB
Go
package diary
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// helpOnly reports whether args, a binary's command line without the
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// program name, only ask for help: before "--" they hold --help or a
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// single-dash cluster that reaches h. It is a tolerant pre-scan of the raw
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// arguments, made before plugins boot, and reads them the way
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// bonfire.PeekGlobals does: it stops at "--", skips the value of --env and
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// reads a single-dash cluster letter by letter, stopping at the first
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// letter that is not a global shorthand (v, q, n, h). It never fails and
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// cannot tell a passthrough command (whose --help reaches its Run) from
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// another, so "<passthrough> --help" counts; the root's OnGlobals hook
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// (ApplyGlobals) restores the console levels before that command runs.
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func helpOnly(args []string) bool {
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for i := 0; i < len(args); i++ {
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a := args[i]
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switch {
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case a == "--":
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return false
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case a == "--env":
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i++
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case a == "--help":
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return true
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case len(a) >= 2 && a[0] == '-' && a[1] != '-':
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if clusterHasHelp(a[1:]) {
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return true
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}
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}
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}
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return false
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}
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// clusterHasHelp reports whether a shorthand cluster (the letters after the
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// dash) reaches h before a letter that is not a global shorthand.
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func clusterHasHelp(cluster string) bool {
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for i := 0; i < len(cluster); i++ {
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switch cluster[i] {
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case 'h':
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return true
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case 'v', 'q', 'n':
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default:
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return false
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}
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}
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return false
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}
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// bootQuiet applies the help-only rule of Bootstrap and Setup: with Args
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// set, no -v and arguments that only ask for help, the setup is installed
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// with Quiet, which raises only the console channels to warn.
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func bootQuiet(opts Options) Options {
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if opts.Args != nil && opts.Verbosity == 0 && helpOnly(opts.Args) {
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opts.Quiet = true
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}
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return opts
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}
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