mirror of
https://github.com/spf13/cobra
synced 2024-06-01 17:39:09 +00:00
4d2c4afa04
* Delete Eq, Gt, appendIfNotPresent and trim functions * Add "[flags]" in UseLine * Simplify other functions * Simplify templates Minor performance improvement. Benchmark for command with 4 flags and one child command: benchmark old ns/op new ns/op delta BenchmarkCmdUsageFunc-4 335860 319290 -4.93% benchmark old allocs new allocs delta BenchmarkCmdUsageFunc-4 562 543 -3.38% benchmark old bytes new bytes delta BenchmarkCmdUsageFunc-4 21623 21037 -2.71%
113 lines
3 KiB
Go
113 lines
3 KiB
Go
// Copyright © 2013 Steve Francia <spf@spf13.com>.
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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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// 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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// 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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"strings"
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"text/template"
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"unicode"
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)
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var templateFuncs = template.FuncMap{
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"trimTrailingWhitespaces": trimTrailingWhitespaces,
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"rpad": rpad,
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}
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var initializers []func()
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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 = false
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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 = true
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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 takes a series of func() arguments and appends them to a slice of func().
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func OnInitialize(y ...func()) {
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initializers = append(initializers, y...)
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}
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func trimTrailingWhitespaces(s string) string {
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return strings.TrimRightFunc(s, unicode.IsSpace)
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}
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// rpad adds padding to the right of a string.
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func rpad(s string, padding int) string {
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template := fmt.Sprintf("%%-%ds", padding)
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return fmt.Sprintf(template, s)
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}
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// tmpl executes the given template text on data, writing the result to w.
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func tmpl(w io.Writer, text string, data interface{}) error {
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t := template.New("top").Funcs(templateFuncs)
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return template.Must(t.Parse(text)).Execute(w, data)
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}
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// ld compares two strings and returns the levenshtein distance between them.
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func ld(s, t string, ignoreCase bool) int {
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if ignoreCase {
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s = strings.ToLower(s)
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t = strings.ToLower(t)
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}
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d := make([][]int, len(s)+1)
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for i := range d {
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d[i] = make([]int, len(t)+1)
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}
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for i := range d {
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d[i][0] = i
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}
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for j := range d[0] {
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d[0][j] = j
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}
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for j := 1; j <= len(t); j++ {
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for i := 1; i <= len(s); i++ {
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if s[i-1] == t[j-1] {
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d[i][j] = d[i-1][j-1]
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} else {
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min := d[i-1][j]
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if d[i][j-1] < min {
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min = d[i][j-1]
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}
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if d[i-1][j-1] < min {
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min = d[i-1][j-1]
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}
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d[i][j] = min + 1
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}
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}
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}
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return d[len(s)][len(t)]
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}
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