diff options
author | Tianon Gravi <admwiggin@gmail.com> | 2015-01-15 11:54:00 -0700 |
---|---|---|
committer | Tianon Gravi <admwiggin@gmail.com> | 2015-01-15 11:54:00 -0700 |
commit | f154da9e12608589e8d5f0508f908a0c3e88a1bb (patch) | |
tree | f8255d51e10c6f1e0ed69702200b966c9556a431 /src/pkg/flag/example_test.go | |
parent | 8d8329ed5dfb9622c82a9fbec6fd99a580f9c9f6 (diff) | |
download | golang-upstream/1.4.tar.gz |
Imported Upstream version 1.4upstream/1.4
Diffstat (limited to 'src/pkg/flag/example_test.go')
-rw-r--r-- | src/pkg/flag/example_test.go | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/src/pkg/flag/example_test.go b/src/pkg/flag/example_test.go deleted file mode 100644 index 04a0d20ee..000000000 --- a/src/pkg/flag/example_test.go +++ /dev/null @@ -1,83 +0,0 @@ -// Copyright 2012 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// These examples demonstrate more intricate uses of the flag package. -package flag_test - -import ( - "errors" - "flag" - "fmt" - "strings" - "time" -) - -// Example 1: A single string flag called "species" with default value "gopher". -var species = flag.String("species", "gopher", "the species we are studying") - -// Example 2: Two flags sharing a variable, so we can have a shorthand. -// The order of initialization is undefined, so make sure both use the -// same default value. They must be set up with an init function. -var gopherType string - -func init() { - const ( - defaultGopher = "pocket" - usage = "the variety of gopher" - ) - flag.StringVar(&gopherType, "gopher_type", defaultGopher, usage) - flag.StringVar(&gopherType, "g", defaultGopher, usage+" (shorthand)") -} - -// Example 3: A user-defined flag type, a slice of durations. -type interval []time.Duration - -// String is the method to format the flag's value, part of the flag.Value interface. -// The String method's output will be used in diagnostics. -func (i *interval) String() string { - return fmt.Sprint(*i) -} - -// Set is the method to set the flag value, part of the flag.Value interface. -// Set's argument is a string to be parsed to set the flag. -// It's a comma-separated list, so we split it. -func (i *interval) Set(value string) error { - // If we wanted to allow the flag to be set multiple times, - // accumulating values, we would delete this if statement. - // That would permit usages such as - // -deltaT 10s -deltaT 15s - // and other combinations. - if len(*i) > 0 { - return errors.New("interval flag already set") - } - for _, dt := range strings.Split(value, ",") { - duration, err := time.ParseDuration(dt) - if err != nil { - return err - } - *i = append(*i, duration) - } - return nil -} - -// Define a flag to accumulate durations. Because it has a special type, -// we need to use the Var function and therefore create the flag during -// init. - -var intervalFlag interval - -func init() { - // Tie the command-line flag to the intervalFlag variable and - // set a usage message. - flag.Var(&intervalFlag, "deltaT", "comma-separated list of intervals to use between events") -} - -func Example() { - // All the interesting pieces are with the variables declared above, but - // to enable the flag package to see the flags defined there, one must - // execute, typically at the start of main (not init!): - // flag.Parse() - // We don't run it here because this is not a main function and - // the testing suite has already parsed the flags. -} |