example_test.go

Documentation: text/tabwriter

		 1  // Copyright 2012 The Go Authors. All rights reserved.
		 2  // Use of this source code is governed by a BSD-style
		 3  // license that can be found in the LICENSE file.
		 4  
		 5  package tabwriter_test
		 6  
		 7  import (
		 8  	"fmt"
		 9  	"os"
		10  	"text/tabwriter"
		11  )
		12  
		13  func ExampleWriter_Init() {
		14  	w := new(tabwriter.Writer)
		15  
		16  	// Format in tab-separated columns with a tab stop of 8.
		17  	w.Init(os.Stdout, 0, 8, 0, '\t', 0)
		18  	fmt.Fprintln(w, "a\tb\tc\td\t.")
		19  	fmt.Fprintln(w, "123\t12345\t1234567\t123456789\t.")
		20  	fmt.Fprintln(w)
		21  	w.Flush()
		22  
		23  	// Format right-aligned in space-separated columns of minimal width 5
		24  	// and at least one blank of padding (so wider column entries do not
		25  	// touch each other).
		26  	w.Init(os.Stdout, 5, 0, 1, ' ', tabwriter.AlignRight)
		27  	fmt.Fprintln(w, "a\tb\tc\td\t.")
		28  	fmt.Fprintln(w, "123\t12345\t1234567\t123456789\t.")
		29  	fmt.Fprintln(w)
		30  	w.Flush()
		31  
		32  	// output:
		33  	// a	b	c	d		.
		34  	// 123	12345	1234567	123456789	.
		35  	//
		36  	//		 a		 b			 c				 d.
		37  	//	 123 12345 1234567 123456789.
		38  }
		39  
		40  func Example_elastic() {
		41  	// Observe how the b's and the d's, despite appearing in the
		42  	// second cell of each line, belong to different columns.
		43  	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, '.', tabwriter.AlignRight|tabwriter.Debug)
		44  	fmt.Fprintln(w, "a\tb\tc")
		45  	fmt.Fprintln(w, "aa\tbb\tcc")
		46  	fmt.Fprintln(w, "aaa\t") // trailing tab
		47  	fmt.Fprintln(w, "aaaa\tdddd\teeee")
		48  	w.Flush()
		49  
		50  	// output:
		51  	// ....a|..b|c
		52  	// ...aa|.bb|cc
		53  	// ..aaa|
		54  	// .aaaa|.dddd|eeee
		55  }
		56  
		57  func Example_trailingTab() {
		58  	// Observe that the third line has no trailing tab,
		59  	// so its final cell is not part of an aligned column.
		60  	const padding = 3
		61  	w := tabwriter.NewWriter(os.Stdout, 0, 0, padding, '-', tabwriter.AlignRight|tabwriter.Debug)
		62  	fmt.Fprintln(w, "a\tb\taligned\t")
		63  	fmt.Fprintln(w, "aa\tbb\taligned\t")
		64  	fmt.Fprintln(w, "aaa\tbbb\tunaligned") // no trailing tab
		65  	fmt.Fprintln(w, "aaaa\tbbbb\taligned\t")
		66  	w.Flush()
		67  
		68  	// output:
		69  	// ------a|------b|---aligned|
		70  	// -----aa|-----bb|---aligned|
		71  	// ----aaa|----bbb|unaligned
		72  	// ---aaaa|---bbbb|---aligned|
		73  }
		74
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