text: // Copyright © 2013 Steve Francia <spf@spf13.com>.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  // http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  // Commands similar to git, go tools and other modern CLI tools
  // inspired by go, go-Commander, gh and subcommand
  
  package cobra
  
  import (
  	"fmt"
  	"io"
  	"reflect"
  	"strconv"
  	"strings"
  	"text/template"
  	"unicode"
  )
  
  var templateFuncs template.FuncMap = template.FuncMap{
  	"trim":           strings.TrimSpace,
  	"trimRightSpace": trimRightSpace,
  	"rpad":           rpad,
  	"gt":             Gt,
  	"eq":             Eq,
  }
  
  var initializers []func()
  
  // automatic prefix matching can be a dangerous thing to automatically enable in CLI tools.
  // Set this to true to enable it
  var EnablePrefixMatching bool = false
  
  // enables an information splash screen on Windows if the CLI is started from explorer.exe.
  var EnableWindowsMouseTrap bool = true
  
  var MousetrapHelpText string = `This is a command line tool
  
  You need to open cmd.exe and run it from there.
  `
  
  //AddTemplateFunc adds a template function that's available to Usage and Help
  //template generation.
  func AddTemplateFunc(name string, tmplFunc interface{}) {
  	templateFuncs[name] = tmplFunc
  }
  
  //AddTemplateFuncs adds multiple template functions availalble to Usage and
  //Help template generation.
  func AddTemplateFuncs(tmplFuncs template.FuncMap) {
  	for k, v := range tmplFuncs {
  		templateFuncs[k] = v
  	}
  }
  
  //OnInitialize takes a series of func() arguments and appends them to a slice of func().
  func OnInitialize(y ...func()) {
  	for _, x := range y {
  		initializers = append(initializers, x)
  	}
  }
  
  //Gt takes two types and checks whether the first type is greater than the second. In case of types Arrays, Chans,
  //Maps and Slices, Gt will compare their lengths. Ints are compared directly while strings are first parsed as
  //ints and then compared.
  func Gt(a interface{}, b interface{}) bool {
  	var left, right int64
  	av := reflect.ValueOf(a)
  
  	switch av.Kind() {
  	case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
  		left = int64(av.Len())
  	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
  		left = av.Int()
  	case reflect.String:
  		left, _ = strconv.ParseInt(av.String(), 10, 64)
  	}
  
  	bv := reflect.ValueOf(b)
  
  	switch bv.Kind() {
  	case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
  		right = int64(bv.Len())
  	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
  		right = bv.Int()
  	case reflect.String:
  		right, _ = strconv.ParseInt(bv.String(), 10, 64)
  	}
  
  	return left > right
  }
  
  //Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic.
  func Eq(a interface{}, b interface{}) bool {
  	av := reflect.ValueOf(a)
  	bv := reflect.ValueOf(b)
  
  	switch av.Kind() {
  	case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
  		panic("Eq called on unsupported type")
  	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
  		return av.Int() == bv.Int()
  	case reflect.String:
  		return av.String() == bv.String()
  	}
  	return false
  }
  
  func trimRightSpace(s string) string {
  	return strings.TrimRightFunc(s, unicode.IsSpace)
  }
  
  //rpad adds padding to the right of a string
  func rpad(s string, padding int) string {
  	template := fmt.Sprintf("%%-%ds", padding)
  	return fmt.Sprintf(template, s)
  }
  
  // tmpl executes the given template text on data, writing the result to w.
  func tmpl(w io.Writer, text string, data interface{}) error {
  	t := template.New("top")
  	t.Funcs(templateFuncs)
  	template.Must(t.Parse(text))
  	return t.Execute(w, data)
  }
  
  // ld compares two strings and returns the levenshtein distance between them
  func ld(s, t string, ignoreCase bool) int {
  	if ignoreCase {
  		s = strings.ToLower(s)
  		t = strings.ToLower(t)
  	}
  	d := make([][]int, len(s)+1)
  	for i := range d {
  		d[i] = make([]int, len(t)+1)
  	}
  	for i := range d {
  		d[i][0] = i
  	}
  	for j := range d[0] {
  		d[0][j] = j
  	}
  	for j := 1; j <= len(t); j++ {
  		for i := 1; i <= len(s); i++ {
  			if s[i-1] == t[j-1] {
  				d[i][j] = d[i-1][j-1]
  			} else {
  				min := d[i-1][j]
  				if d[i][j-1] < min {
  					min = d[i][j-1]
  				}
  				if d[i-1][j-1] < min {
  					min = d[i-1][j-1]
  				}
  				d[i][j] = min + 1
  			}
  		}
  
  	}
  	return d[len(s)][len(t)]
  }
  