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Source file src/text/tabwriter/example_test.go

Documentation: text/tabwriter

  // 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.
  
  package tabwriter_test
  
  import (
  	"fmt"
  	"os"
  	"text/tabwriter"
  )
  
  func ExampleWriter_Init() {
  	w := new(tabwriter.Writer)
  
  	// Format in tab-separated columns with a tab stop of 8.
  	w.Init(os.Stdout, 0, 8, 0, '\t', 0)
  	fmt.Fprintln(w, "a\tb\tc\td\t.")
  	fmt.Fprintln(w, "123\t12345\t1234567\t123456789\t.")
  	fmt.Fprintln(w)
  	w.Flush()
  
  	// Format right-aligned in space-separated columns of minimal width 5
  	// and at least one blank of padding (so wider column entries do not
  	// touch each other).
  	w.Init(os.Stdout, 5, 0, 1, ' ', tabwriter.AlignRight)
  	fmt.Fprintln(w, "a\tb\tc\td\t.")
  	fmt.Fprintln(w, "123\t12345\t1234567\t123456789\t.")
  	fmt.Fprintln(w)
  	w.Flush()
  
  	// output:
  	// a	b	c	d		.
  	// 123	12345	1234567	123456789	.
  	//
  	//     a     b       c         d.
  	//   123 12345 1234567 123456789.
  }
  
  func Example_elastic() {
  	// Observe how the b's and the d's, despite appearing in the
  	// second cell of each line, belong to different columns.
  	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, '.', tabwriter.AlignRight|tabwriter.Debug)
  	fmt.Fprintln(w, "a\tb\tc")
  	fmt.Fprintln(w, "aa\tbb\tcc")
  	fmt.Fprintln(w, "aaa\t") // trailing tab
  	fmt.Fprintln(w, "aaaa\tdddd\teeee")
  	w.Flush()
  
  	// output:
  	// ....a|..b|c
  	// ...aa|.bb|cc
  	// ..aaa|
  	// .aaaa|.dddd|eeee
  }
  
  func Example_trailingTab() {
  	// Observe that the third line has no trailing tab,
  	// so its final cell is not part of an aligned column.
  	const padding = 3
  	w := tabwriter.NewWriter(os.Stdout, 0, 0, padding, '-', tabwriter.AlignRight|tabwriter.Debug)
  	fmt.Fprintln(w, "a\tb\taligned\t")
  	fmt.Fprintln(w, "aa\tbb\taligned\t")
  	fmt.Fprintln(w, "aaa\tbbb\tunaligned") // no trailing tab
  	fmt.Fprintln(w, "aaaa\tbbbb\taligned\t")
  	w.Flush()
  
  	// output:
  	// ------a|------b|---aligned|
  	// -----aa|-----bb|---aligned|
  	// ----aaa|----bbb|unaligned
  	// ---aaaa|---bbbb|---aligned|
  }
  

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