Updates ryanuber/columnize.

vendor/github.com/ryanuber/columnize/.travis.yml

@@ -1,3 +0,0 @@
-language: go
-go:
-  - tip

vendor/github.com/ryanuber/columnize/README.md

@@ -4,6 +4,7 @@ Columnize
 Easy column-formatted output for golang
 
 [![Build Status](https://travis-ci.org/ryanuber/columnize.svg)](https://travis-ci.org/ryanuber/columnize)
+[![GoDoc](https://godoc.org/github.com/ryanuber/columnize?status.svg)](https://godoc.org/github.com/ryanuber/columnize)
 
 Columnize is a really small Go package that makes building CLI's a little bit
 easier. In some CLI designs, you want to output a number similar items in a
@@ -65,11 +66,4 @@ config.Empty = ""
 You can then pass the `Config` in using the `Format` method (signature below) to
 have text formatted to your liking.
 
-Usage
-=====
-
-```go
-SimpleFormat(intput []string) string
-
-Format(input []string, config *Config) string
-```
+See the [godoc](https://godoc.org/github.com/ryanuber/columnize) page for usage.

vendor/github.com/ryanuber/columnize/columnize.go

@@ -1,10 +1,13 @@
 package columnize
 
 import (
+	"bytes"
 	"fmt"
 	"strings"
 )
 
+// Config can be used to tune certain parameters which affect the way
+// in which Columnize will format output text.
 type Config struct {
 	// The string by which the lines of input will be split.
 	Delim string
@@ -19,66 +22,16 @@ type Config struct {
 	Empty string
 }
 
-// Returns a Config with default values.
+// DefaultConfig returns a *Config with default values.
 func DefaultConfig() *Config {
 	return &Config{
 		Delim:  "|",
 		Glue:   "  ",
 		Prefix: "",
+		Empty:  "",
 	}
 }
 
-// Returns a list of elements, each representing a single item which will
-// belong to a column of output.
-func getElementsFromLine(config *Config, line string) []interface{} {
-	elements := make([]interface{}, 0)
-	for _, field := range strings.Split(line, config.Delim) {
-		value := strings.TrimSpace(field)
-		if value == "" && config.Empty != "" {
-			value = config.Empty
-		}
-		elements = append(elements, value)
-	}
-	return elements
-}
-
-// Examines a list of strings and determines how wide each column should be
-// considering all of the elements that need to be printed within it.
-func getWidthsFromLines(config *Config, lines []string) []int {
-	var widths []int
-
-	for _, line := range lines {
-		elems := getElementsFromLine(config, line)
-		for i := 0; i < len(elems); i++ {
-			l := len(elems[i].(string))
-			if len(widths) <= i {
-				widths = append(widths, l)
-			} else if widths[i] < l {
-				widths[i] = l
-			}
-		}
-	}
-	return widths
-}
-
-// Given a set of column widths and the number of columns in the current line,
-// returns a sprintf-style format string which can be used to print output
-// aligned properly with other lines using the same widths set.
-func (c *Config) getStringFormat(widths []int, columns int) string {
-	// Start with the prefix, if any was given.
-	stringfmt := c.Prefix
-
-	// Create the format string from the discovered widths
-	for i := 0; i < columns && i < len(widths); i++ {
-		if i == columns-1 {
-			stringfmt += "%s\n"
-		} else {
-			stringfmt += fmt.Sprintf("%%-%ds%s", widths[i], c.Glue)
-		}
-	}
-	return stringfmt
-}
-
 // MergeConfig merges two config objects together and returns the resulting
 // configuration. Values from the right take precedence over the left side.
 func MergeConfig(a, b *Config) *Config {
@@ -105,21 +58,103 @@ func MergeConfig(a, b *Config) *Config {
 	return &result
 }
 
-// Format is the public-facing interface that takes either a plain string
-// or a list of strings and returns nicely aligned output.
-func Format(lines []string, config *Config) string {
-	var result string
+// stringFormat, given a set of column widths and the number of columns in
+// the current line, returns a sprintf-style format string which can be used
+// to print output aligned properly with other lines using the same widths set.
+func stringFormat(c *Config, widths []int, columns int) string {
+	// Create the buffer with an estimate of the length
+	buf := bytes.NewBuffer(make([]byte, 0, (6+len(c.Glue))*columns))
 
+	// Start with the prefix, if any was given. The buffer will not return an
+	// error so it does not need to be handled
+	buf.WriteString(c.Prefix)
+
+	// Create the format string from the discovered widths
+	for i := 0; i < columns && i < len(widths); i++ {
+		if i == columns-1 {
+			buf.WriteString("%s\n")
+		} else {
+			fmt.Fprintf(buf, "%%-%ds%s", widths[i], c.Glue)
+		}
+	}
+	return buf.String()
+}
+
+// elementsFromLine returns a list of elements, each representing a single
+// item which will belong to a column of output.
+func elementsFromLine(config *Config, line string) []interface{} {
+	seperated := strings.Split(line, config.Delim)
+	elements := make([]interface{}, len(seperated))
+	for i, field := range seperated {
+		value := strings.TrimSpace(field)
+
+		// Apply the empty value, if configured.
+		if value == "" && config.Empty != "" {
+			value = config.Empty
+		}
+		elements[i] = value
+	}
+	return elements
+}
+
+// widthsFromLines examines a list of strings and determines how wide each
+// column should be considering all of the elements that need to be printed
+// within it.
+func widthsFromLines(config *Config, lines []string) []int {
+	widths := make([]int, 0, 8)
+
+	for _, line := range lines {
+		elems := elementsFromLine(config, line)
+		for i := 0; i < len(elems); i++ {
+			l := len(elems[i].(string))
+			if len(widths) <= i {
+				widths = append(widths, l)
+			} else if widths[i] < l {
+				widths[i] = l
+			}
+		}
+	}
+	return widths
+}
+
+// Format is the public-facing interface that takes a list of strings and
+// returns nicely aligned column-formatted text.
+func Format(lines []string, config *Config) string {
 	conf := MergeConfig(DefaultConfig(), config)
-	widths := getWidthsFromLines(conf, lines)
+	widths := widthsFromLines(conf, lines)
+
+	// Estimate the buffer size
+	glueSize := len(conf.Glue)
+	var size int
+	for _, w := range widths {
+		size += w + glueSize
+	}
+	size *= len(lines)
+
+	// Create the buffer
+	buf := bytes.NewBuffer(make([]byte, 0, size))
+
+	// Create a cache for the string formats
+	fmtCache := make(map[int]string, 16)
 
 	// Create the formatted output using the format string
 	for _, line := range lines {
-		elems := getElementsFromLine(conf, line)
-		stringfmt := conf.getStringFormat(widths, len(elems))
-		result += fmt.Sprintf(stringfmt, elems...)
+		elems := elementsFromLine(conf, line)
+
+		// Get the string format using cache
+		numElems := len(elems)
+		stringfmt, ok := fmtCache[numElems]
+		if !ok {
+			stringfmt = stringFormat(conf, widths, numElems)
+			fmtCache[numElems] = stringfmt
+		}
+
+		fmt.Fprintf(buf, stringfmt, elems...)
 	}
 
+	// Get the string result
+	result := buf.String()
+
 	// Remove trailing newline without removing leading/trailing space
 	if n := len(result); n > 0 && result[n-1] == '\n' {
 		result = result[:n-1]
@@ -128,7 +163,7 @@ func Format(lines []string, config *Config) string {
 	return result
 }
 
-// Convenience function for using Columnize as easy as possible.
+// SimpleFormat is a convenience function to format text with the defaults.
 func SimpleFormat(lines []string) string {
 	return Format(lines, nil)
 }

vendor/vendor.json

@@ -462,9 +462,11 @@
 			"revisionTime": "2016-08-09T12:22:04Z"
 		},
 		{
+			"checksumSHA1": "ExnVEVNT8APpFTm26cUb5T09yR4=",
 			"comment": "v2.0.1-8-g983d3a5",
 			"path": "github.com/ryanuber/columnize",
-			"revision": "983d3a5fab1bf04d1b412465d2d9f8430e2e917e"
+			"revision": "9b3edd62028f107d7cabb19353292afd29311a4e",
+			"revisionTime": "2016-07-12T16:32:29Z"
 		},
 		{
 			"checksumSHA1": "9jjO5GjLa0XF/nfWihF02RoH4qc=",