author | Mikael Berthe <mikael@lilotux.net> |
Sat, 04 Feb 2023 12:58:35 +0100 | |
changeset 265 | 05c40b36d3b2 |
parent 256 | 6d9efbef00a9 |
permissions | -rw-r--r-- |
265
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// Copyright 2013-2022 The Cobra Authors |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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|
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// Commands similar to git, go tools and other modern CLI tools |
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// inspired by go, go-Commander, gh and subcommand |
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package cobra |
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import ( |
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"fmt" |
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"io" |
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"os" |
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"reflect" |
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"strconv" |
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"strings" |
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"text/template" |
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"time" |
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"unicode" |
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) |
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var templateFuncs = template.FuncMap{ |
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"trim": strings.TrimSpace, |
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"trimRightSpace": trimRightSpace, |
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"trimTrailingWhitespaces": trimRightSpace, |
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"appendIfNotPresent": appendIfNotPresent, |
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"rpad": rpad, |
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"gt": Gt, |
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"eq": Eq, |
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} |
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var initializers []func() |
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var finalizers []func() |
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const ( |
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defaultPrefixMatching = false |
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defaultCommandSorting = true |
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defaultCaseInsensitive = false |
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) |
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// EnablePrefixMatching allows to set automatic prefix matching. Automatic prefix matching can be a dangerous thing |
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// to automatically enable in CLI tools. |
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// Set this to true to enable it. |
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var EnablePrefixMatching = defaultPrefixMatching |
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// EnableCommandSorting controls sorting of the slice of commands, which is turned on by default. |
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// To disable sorting, set it to false. |
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var EnableCommandSorting = defaultCommandSorting |
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// EnableCaseInsensitive allows case-insensitive commands names. (case sensitive by default) |
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var EnableCaseInsensitive = defaultCaseInsensitive |
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// MousetrapHelpText enables an information splash screen on Windows |
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// if the CLI is started from explorer.exe. |
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// To disable the mousetrap, just set this variable to blank string (""). |
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// Works only on Microsoft Windows. |
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var MousetrapHelpText = `This is a command line tool. |
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You need to open cmd.exe and run it from there. |
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` |
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// MousetrapDisplayDuration controls how long the MousetrapHelpText message is displayed on Windows |
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// if the CLI is started from explorer.exe. Set to 0 to wait for the return key to be pressed. |
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// To disable the mousetrap, just set MousetrapHelpText to blank string (""). |
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// Works only on Microsoft Windows. |
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var MousetrapDisplayDuration = 5 * time.Second |
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// AddTemplateFunc adds a template function that's available to Usage and Help |
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// template generation. |
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func AddTemplateFunc(name string, tmplFunc interface{}) { |
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templateFuncs[name] = tmplFunc |
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} |
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// AddTemplateFuncs adds multiple template functions that are available to Usage and |
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// Help template generation. |
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func AddTemplateFuncs(tmplFuncs template.FuncMap) { |
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for k, v := range tmplFuncs { |
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templateFuncs[k] = v |
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} |
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} |
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// OnInitialize sets the passed functions to be run when each command's |
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// Execute method is called. |
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func OnInitialize(y ...func()) { |
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initializers = append(initializers, y...) |
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} |
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97 |
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// OnFinalize sets the passed functions to be run when each command's |
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// Execute method is terminated. |
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func OnFinalize(y ...func()) { |
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finalizers = append(finalizers, y...) |
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} |
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103 |
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// 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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105 |
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// 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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// Maps and Slices, Gt will compare their lengths. Ints are compared directly while strings are first parsed as |
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// ints and then compared. |
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func Gt(a interface{}, b interface{}) bool { |
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110 |
var left, right int64 |
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111 |
av := reflect.ValueOf(a) |
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112 |
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113 |
switch av.Kind() { |
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114 |
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice: |
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left = int64(av.Len()) |
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116 |
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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left = av.Int() |
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case reflect.String: |
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left, _ = strconv.ParseInt(av.String(), 10, 64) |
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120 |
} |
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121 |
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122 |
bv := reflect.ValueOf(b) |
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123 |
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124 |
switch bv.Kind() { |
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parents:
diff
changeset
|
125 |
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice: |
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parents:
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|
126 |
right = int64(bv.Len()) |
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parents:
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changeset
|
127 |
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
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parents:
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|
128 |
right = bv.Int() |
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parents:
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|
129 |
case reflect.String: |
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parents:
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changeset
|
130 |
right, _ = strconv.ParseInt(bv.String(), 10, 64) |
2a9ec03fe5a1
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parents:
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|
131 |
} |
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parents:
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changeset
|
132 |
|
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parents:
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|
133 |
return left > right |
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parents:
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changeset
|
134 |
} |
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parents:
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changeset
|
135 |
|
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parents:
diff
changeset
|
136 |
// FIXME Eq is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra. |
2a9ec03fe5a1
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parents:
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changeset
|
137 |
|
2a9ec03fe5a1
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parents:
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changeset
|
138 |
// Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic. |
2a9ec03fe5a1
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parents:
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changeset
|
139 |
func Eq(a interface{}, b interface{}) bool { |
2a9ec03fe5a1
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parents:
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changeset
|
140 |
av := reflect.ValueOf(a) |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
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|
141 |
bv := reflect.ValueOf(b) |
2a9ec03fe5a1
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parents:
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changeset
|
142 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
143 |
switch av.Kind() { |
2a9ec03fe5a1
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parents:
diff
changeset
|
144 |
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice: |
2a9ec03fe5a1
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parents:
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changeset
|
145 |
panic("Eq called on unsupported type") |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
146 |
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
2a9ec03fe5a1
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parents:
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changeset
|
147 |
return av.Int() == bv.Int() |
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parents:
diff
changeset
|
148 |
case reflect.String: |
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parents:
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changeset
|
149 |
return av.String() == bv.String() |
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|
150 |
} |
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parents:
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changeset
|
151 |
return false |
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parents:
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changeset
|
152 |
} |
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parents:
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changeset
|
153 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
154 |
func trimRightSpace(s string) string { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
155 |
return strings.TrimRightFunc(s, unicode.IsSpace) |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
156 |
} |
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parents:
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changeset
|
157 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
158 |
// FIXME appendIfNotPresent is unused by cobra and should be removed in a version 2. It exists only for compatibility with users of cobra. |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
159 |
|
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parents:
diff
changeset
|
160 |
// appendIfNotPresent will append stringToAppend to the end of s, but only if it's not yet present in s. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
161 |
func appendIfNotPresent(s, stringToAppend string) string { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
162 |
if strings.Contains(s, stringToAppend) { |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
163 |
return s |
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
164 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
165 |
return s + " " + stringToAppend |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
166 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
167 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
168 |
// rpad adds padding to the right of a string. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
169 |
func rpad(s string, padding int) string { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
170 |
template := fmt.Sprintf("%%-%ds", padding) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
171 |
return fmt.Sprintf(template, s) |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
172 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
173 |
|
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
174 |
// tmpl executes the given template text on data, writing the result to w. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
175 |
func tmpl(w io.Writer, text string, data interface{}) error { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
176 |
t := template.New("top") |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
177 |
t.Funcs(templateFuncs) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
178 |
template.Must(t.Parse(text)) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
179 |
return t.Execute(w, data) |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
180 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
181 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
182 |
// ld compares two strings and returns the levenshtein distance between them. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
183 |
func ld(s, t string, ignoreCase bool) int { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
184 |
if ignoreCase { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
185 |
s = strings.ToLower(s) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
186 |
t = strings.ToLower(t) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
187 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
188 |
d := make([][]int, len(s)+1) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
189 |
for i := range d { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
190 |
d[i] = make([]int, len(t)+1) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
191 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
192 |
for i := range d { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
193 |
d[i][0] = i |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
194 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
195 |
for j := range d[0] { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
196 |
d[0][j] = j |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
197 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
198 |
for j := 1; j <= len(t); j++ { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
199 |
for i := 1; i <= len(s); i++ { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
200 |
if s[i-1] == t[j-1] { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
201 |
d[i][j] = d[i-1][j-1] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
202 |
} else { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
203 |
min := d[i-1][j] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
204 |
if d[i][j-1] < min { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
205 |
min = d[i][j-1] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
206 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
207 |
if d[i-1][j-1] < min { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
208 |
min = d[i-1][j-1] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
209 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
210 |
d[i][j] = min + 1 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
211 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
212 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
213 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
214 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
215 |
return d[len(s)][len(t)] |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
216 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
217 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
218 |
func stringInSlice(a string, list []string) bool { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
219 |
for _, b := range list { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
220 |
if b == a { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
221 |
return true |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
222 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
223 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
224 |
return false |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
225 |
} |
256 | 226 |
|
227 |
// CheckErr prints the msg with the prefix 'Error:' and exits with error code 1. If the msg is nil, it does nothing. |
|
228 |
func CheckErr(msg interface{}) { |
|
229 |
if msg != nil { |
|
230 |
fmt.Fprintln(os.Stderr, "Error:", msg) |
|
231 |
os.Exit(1) |
|
232 |
} |
|
233 |
} |
|
234 |
||
235 |
// WriteStringAndCheck writes a string into a buffer, and checks if the error is not nil. |
|
236 |
func WriteStringAndCheck(b io.StringWriter, s string) { |
|
237 |
_, err := b.WriteString(s) |
|
238 |
CheckErr(err) |
|
239 |
} |