func ExampleCommand_withError() {
err := stream.Run(stream.Command("no_such_command"))
if err == nil {
fmt.Println("execution of missing command succeeded unexpectedly")
}
// Output:
}
func ExampleFind_error() {
err := stream.Run(stream.Find("/no_such_dir"))
if err == nil {
fmt.Println("stream.Find did not return expected error")
}
// Output:
}
func ExampleSample() {
stream.Run(
stream.Numbers(100, 200),
stream.Sample(4),
stream.WriteLines(os.Stdout),
)
// Output not checked since it is non-deterministic.
}
func BenchmarkFive(b *testing.B) {
f := stream.FilterFunc(func(arg stream.Arg) error {
for s := range arg.In {
arg.Out <- s
}
return nil
})
stream.Run(stream.Repeat("", b.N), f, f, f, f)
}
func ExampleXargs() {
stream.Run(
stream.Numbers(1, 5),
stream.Xargs("echo"),
stream.WriteLines(os.Stdout),
)
// Output:
// 1 2 3 4 5
}
func ExampleItems() {
stream.Run(
stream.Items("hello", "world"),
stream.WriteLines(os.Stdout),
)
// Output:
// hello
// world
}
func ExampleCommand() {
stream.Run(
stream.Numbers(1, 100),
stream.Command("wc", "-l"),
stream.WriteLines(os.Stdout),
)
// Output:
// 100
}
func ExampleCat() {
stream.Run(
stream.Cat("stream_test.go"),
stream.Grep("^func ExampleCat"),
stream.WriteLines(os.Stdout),
)
// Output:
// func ExampleCat() {
}
func ExampleColumns() {
stream.Run(
stream.Items("hello world"),
stream.Columns(2, 3, 1),
stream.WriteLines(os.Stdout),
)
// Output:
// world hello
}
func ExampleNumberLines() {
stream.Run(
stream.Items("a", "b"),
stream.NumberLines(),
stream.WriteLines(os.Stdout),
)
// Output:
// 1 a
// 2 b
}
func ExampleWriteLines() {
stream.Run(
stream.Numbers(1, 3),
stream.WriteLines(os.Stdout),
)
// Output:
// 1
// 2
// 3
}
func ExampleFindFilter_SkipDirIf() {
stream.Run(
stream.Find(".").SkipDirIf(func(d string) bool { return d == ".git" }),
stream.Grep("x"),
stream.WriteLines(os.Stdout),
)
// Output:
// regexp.go
// xargs.go
}
func ExampleFind() {
stream.Run(
stream.Find(".").IfMode(os.FileMode.IsRegular),
stream.Grep("stream"),
stream.WriteLines(os.Stdout),
)
// Output:
// stream.go
// stream_test.go
}
func ExampleDropFirst() {
stream.Run(
stream.Numbers(1, 10),
stream.DropFirst(8),
stream.WriteLines(os.Stdout),
)
// Output:
// 9
// 10
}
func ExampleLast() {
stream.Run(
stream.Numbers(1, 10),
stream.Last(2),
stream.WriteLines(os.Stdout),
)
// Output:
// 9
// 10
}
func ExampleReverse() {
stream.Run(
stream.Items("a", "b"),
stream.Reverse(),
stream.WriteLines(os.Stdout),
)
// Output:
// b
// a
}
func ExampleUniqWithCount() {
stream.Run(
stream.Items("a", "b", "b", "c"),
stream.UniqWithCount(),
stream.WriteLines(os.Stdout),
)
// Output:
// 1 a
// 2 b
// 1 c
}
func ExampleRun() {
err := stream.Run(
stream.Items("line 1", "line 2"),
stream.WriteLines(os.Stdout),
)
fmt.Println("error:", err)
// Output:
// line 1
// line 2
// error: <nil>
}
func ExampleSorter_By() {
stream.Run(
stream.Items("bananas", "apples", "pears"),
stream.Sort().By(func(a, b string) bool { return len(a) < len(b) }),
stream.WriteLines(os.Stdout),
)
// Output:
// pears
// apples
// bananas
}
func ExampleFirst() {
stream.Run(
stream.Numbers(1, 10),
stream.First(3),
stream.WriteLines(os.Stdout),
)
// Output:
// 1
// 2
// 3
}
func ExampleSampleWithSeed() {
stream.Run(
stream.Numbers(1, 100),
stream.SampleWithSeed(2, 100),
stream.Sort().Num(1),
stream.WriteLines(os.Stdout),
)
// Output:
// 11
// 46
}
func BenchmarkWrite(b *testing.B) {
f, err := os.Create("/dev/null")
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
stream.Run(
stream.Repeat("hello", b.N),
stream.WriteLines(f),
)
}
func ExampleGrepNot() {
stream.Run(
stream.Numbers(1, 12),
stream.GrepNot("^.$"),
stream.WriteLines(os.Stdout),
)
// Output:
// 10
// 11
// 12
}
func ExampleIf() {
stream.Run(
stream.Numbers(1, 12),
stream.If(func(s string) bool { return len(s) > 1 }),
stream.WriteLines(os.Stdout),
)
// Output:
// 10
// 11
// 12
}
func ExampleNumbers() {
stream.Run(
stream.Numbers(2, 5),
stream.WriteLines(os.Stdout),
)
// Output:
// 2
// 3
// 4
// 5
}
func ExampleXargsFilter_LimitArgs() {
stream.Run(
stream.Numbers(1, 5),
stream.Xargs("echo").LimitArgs(2),
stream.WriteLines(os.Stdout),
)
// Output:
// 1 2
// 3 4
// 5
}
func ExampleSort() {
stream.Run(
stream.Items("banana", "apple", "cheese", "apple"),
stream.Sort(),
stream.WriteLines(os.Stdout),
)
// Output:
// apple
// apple
// banana
// cheese
}
func ExampleXargs_splitArguments() {
// Xargs should split the long list of arguments into
// three executions to keep command length below 4096.
stream.Run(
stream.Numbers(1, 2000),
stream.Xargs("echo"),
stream.Command("wc", "-l"),
stream.WriteLines(os.Stdout),
)
// Output:
// 3
}
func ExampleReadLines() {
stream.Run(
stream.ReadLines(bytes.NewBufferString("the\nquick\nbrown\nfox\n")),
stream.Sort(),
stream.WriteLines(os.Stdout),
)
// Output:
// brown
// fox
// quick
// the
}
func ExampleCommand_outputOnly() {
stream.Run(
stream.Command("find", ".", "-type", "f", "-print"),
stream.Grep(`^\./stream.*\.go$`),
stream.Sort(),
stream.WriteLines(os.Stdout),
)
// Output:
// ./stream.go
// ./stream_test.go
}