author | Mikael Berthe <mikael@lilotux.net> |
Sun, 16 Feb 2020 18:54:01 +0100 | |
changeset 251 | 1c52a0eeb952 |
parent 242 | 2a9ec03fe5a1 |
child 256 | 6d9efbef00a9 |
permissions | -rw-r--r-- |
242
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1 |
// Copyright © 2013 Steve Francia <spf@spf13.com>. |
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2 |
// |
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3 |
// Licensed under the Apache License, Version 2.0 (the "License"); |
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4 |
// you may not use this file except in compliance with the License. |
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5 |
// You may obtain a copy of the License at |
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6 |
// http://www.apache.org/licenses/LICENSE-2.0 |
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7 |
// |
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8 |
// Unless required by applicable law or agreed to in writing, software |
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9 |
// distributed under the License is distributed on an "AS IS" BASIS, |
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10 |
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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11 |
// See the License for the specific language governing permissions and |
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12 |
// limitations under the License. |
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13 |
|
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14 |
// Commands similar to git, go tools and other modern CLI tools |
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15 |
// inspired by go, go-Commander, gh and subcommand |
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16 |
|
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17 |
package cobra |
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18 |
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19 |
import ( |
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20 |
"fmt" |
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21 |
"io" |
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22 |
"reflect" |
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23 |
"strconv" |
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24 |
"strings" |
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25 |
"text/template" |
251 | 26 |
"time" |
242
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27 |
"unicode" |
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28 |
) |
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29 |
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30 |
var templateFuncs = template.FuncMap{ |
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31 |
"trim": strings.TrimSpace, |
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32 |
"trimRightSpace": trimRightSpace, |
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33 |
"trimTrailingWhitespaces": trimRightSpace, |
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"appendIfNotPresent": appendIfNotPresent, |
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35 |
"rpad": rpad, |
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36 |
"gt": Gt, |
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37 |
"eq": Eq, |
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38 |
} |
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39 |
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40 |
var initializers []func() |
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41 |
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42 |
// EnablePrefixMatching allows to set automatic prefix matching. Automatic prefix matching can be a dangerous thing |
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43 |
// to automatically enable in CLI tools. |
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44 |
// Set this to true to enable it. |
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45 |
var EnablePrefixMatching = false |
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46 |
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// EnableCommandSorting controls sorting of the slice of commands, which is turned on by default. |
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48 |
// To disable sorting, set it to false. |
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49 |
var EnableCommandSorting = true |
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50 |
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51 |
// MousetrapHelpText enables an information splash screen on Windows |
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52 |
// if the CLI is started from explorer.exe. |
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53 |
// To disable the mousetrap, just set this variable to blank string (""). |
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54 |
// Works only on Microsoft Windows. |
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55 |
var MousetrapHelpText string = `This is a command line tool. |
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56 |
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57 |
You need to open cmd.exe and run it from there. |
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58 |
` |
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59 |
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251 | 60 |
// MousetrapDisplayDuration controls how long the MousetrapHelpText message is displayed on Windows |
61 |
// if the CLI is started from explorer.exe. Set to 0 to wait for the return key to be pressed. |
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62 |
// To disable the mousetrap, just set MousetrapHelpText to blank string (""). |
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63 |
// Works only on Microsoft Windows. |
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64 |
var MousetrapDisplayDuration time.Duration = 5 * time.Second |
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65 |
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66 |
// AddTemplateFunc adds a template function that's available to Usage and Help |
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67 |
// template generation. |
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68 |
func AddTemplateFunc(name string, tmplFunc interface{}) { |
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69 |
templateFuncs[name] = tmplFunc |
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70 |
} |
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71 |
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72 |
// AddTemplateFuncs adds multiple template functions that are available to Usage and |
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73 |
// Help template generation. |
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74 |
func AddTemplateFuncs(tmplFuncs template.FuncMap) { |
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75 |
for k, v := range tmplFuncs { |
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76 |
templateFuncs[k] = v |
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77 |
} |
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78 |
} |
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79 |
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80 |
// OnInitialize sets the passed functions to be run when each command's |
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81 |
// Execute method is called. |
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82 |
func OnInitialize(y ...func()) { |
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83 |
initializers = append(initializers, y...) |
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84 |
} |
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85 |
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86 |
// FIXME Gt is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra. |
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87 |
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88 |
// Gt takes two types and checks whether the first type is greater than the second. In case of types Arrays, Chans, |
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89 |
// Maps and Slices, Gt will compare their lengths. Ints are compared directly while strings are first parsed as |
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90 |
// ints and then compared. |
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91 |
func Gt(a interface{}, b interface{}) bool { |
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92 |
var left, right int64 |
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93 |
av := reflect.ValueOf(a) |
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94 |
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95 |
switch av.Kind() { |
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96 |
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice: |
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97 |
left = int64(av.Len()) |
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98 |
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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99 |
left = av.Int() |
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100 |
case reflect.String: |
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101 |
left, _ = strconv.ParseInt(av.String(), 10, 64) |
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102 |
} |
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103 |
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104 |
bv := reflect.ValueOf(b) |
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105 |
|
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106 |
switch bv.Kind() { |
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107 |
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice: |
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108 |
right = int64(bv.Len()) |
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109 |
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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110 |
right = bv.Int() |
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111 |
case reflect.String: |
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112 |
right, _ = strconv.ParseInt(bv.String(), 10, 64) |
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113 |
} |
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114 |
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115 |
return left > right |
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116 |
} |
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117 |
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118 |
// FIXME Eq is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra. |
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119 |
|
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120 |
// Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic. |
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121 |
func Eq(a interface{}, b interface{}) bool { |
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122 |
av := reflect.ValueOf(a) |
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123 |
bv := reflect.ValueOf(b) |
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124 |
|
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125 |
switch av.Kind() { |
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126 |
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice: |
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127 |
panic("Eq called on unsupported type") |
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128 |
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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129 |
return av.Int() == bv.Int() |
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130 |
case reflect.String: |
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131 |
return av.String() == bv.String() |
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132 |
} |
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133 |
return false |
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134 |
} |
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135 |
|
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136 |
func trimRightSpace(s string) string { |
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137 |
return strings.TrimRightFunc(s, unicode.IsSpace) |
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138 |
} |
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139 |
|
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140 |
// FIXME appendIfNotPresent is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra. |
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141 |
|
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142 |
// appendIfNotPresent will append stringToAppend to the end of s, but only if it's not yet present in s. |
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parents:
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143 |
func appendIfNotPresent(s, stringToAppend string) string { |
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parents:
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|
144 |
if strings.Contains(s, stringToAppend) { |
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|
145 |
return s |
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|
146 |
} |
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147 |
return s + " " + stringToAppend |
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148 |
} |
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149 |
|
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150 |
// rpad adds padding to the right of a string. |
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151 |
func rpad(s string, padding int) string { |
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|
152 |
template := fmt.Sprintf("%%-%ds", padding) |
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153 |
return fmt.Sprintf(template, s) |
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154 |
} |
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155 |
|
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|
156 |
// tmpl executes the given template text on data, writing the result to w. |
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parents:
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|
157 |
func tmpl(w io.Writer, text string, data interface{}) error { |
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|
158 |
t := template.New("top") |
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|
159 |
t.Funcs(templateFuncs) |
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|
160 |
template.Must(t.Parse(text)) |
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|
161 |
return t.Execute(w, data) |
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|
162 |
} |
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|
163 |
|
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parents:
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changeset
|
164 |
// ld compares two strings and returns the levenshtein distance between them. |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
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changeset
|
165 |
func ld(s, t string, ignoreCase bool) int { |
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parents:
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|
166 |
if ignoreCase { |
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parents:
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|
167 |
s = strings.ToLower(s) |
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parents:
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|
168 |
t = strings.ToLower(t) |
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parents:
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|
169 |
} |
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parents:
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changeset
|
170 |
d := make([][]int, len(s)+1) |
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parents:
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changeset
|
171 |
for i := range d { |
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parents:
diff
changeset
|
172 |
d[i] = make([]int, len(t)+1) |
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parents:
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changeset
|
173 |
} |
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parents:
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changeset
|
174 |
for i := range d { |
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parents:
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changeset
|
175 |
d[i][0] = i |
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parents:
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changeset
|
176 |
} |
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parents:
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changeset
|
177 |
for j := range d[0] { |
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parents:
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changeset
|
178 |
d[0][j] = j |
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parents:
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changeset
|
179 |
} |
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parents:
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changeset
|
180 |
for j := 1; j <= len(t); j++ { |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
181 |
for i := 1; i <= len(s); i++ { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
182 |
if s[i-1] == t[j-1] { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
183 |
d[i][j] = d[i-1][j-1] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
184 |
} else { |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
185 |
min := d[i-1][j] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
186 |
if d[i][j-1] < min { |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
187 |
min = d[i][j-1] |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
188 |
} |
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
189 |
if d[i-1][j-1] < min { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
190 |
min = d[i-1][j-1] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
191 |
} |
2a9ec03fe5a1
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parents:
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changeset
|
192 |
d[i][j] = min + 1 |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
193 |
} |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
194 |
} |
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
195 |
|
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
196 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
197 |
return d[len(s)][len(t)] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
198 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
199 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
200 |
func stringInSlice(a string, list []string) bool { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
201 |
for _, b := range list { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
202 |
if b == a { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
203 |
return true |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
204 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
205 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
206 |
return false |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
207 |
} |