forked from TrueCloudLab/distribution
112 lines
3.3 KiB
Go
112 lines
3.3 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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"reflect"
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"strconv"
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"strings"
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"text/template"
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)
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var initializers []func()
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// automatic prefix matching can be a dangerous thing to automatically enable in CLI tools.
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// Set this to true to enable it
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var EnablePrefixMatching bool = false
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// enables an information splash screen on Windows if the CLI is started from explorer.exe.
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var EnableWindowsMouseTrap bool = true
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var MousetrapHelpText string = `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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//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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for _, x := range y {
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initializers = append(initializers, x)
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}
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}
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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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var left, right int64
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av := reflect.ValueOf(a)
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switch av.Kind() {
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case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
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left = int64(av.Len())
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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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}
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bv := reflect.ValueOf(b)
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switch bv.Kind() {
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case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
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right = int64(bv.Len())
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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right = bv.Int()
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case reflect.String:
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right, _ = strconv.ParseInt(bv.String(), 10, 64)
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}
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return left > right
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}
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//Eq takes two types and checks whether they are equal. Supported types are int and string. Unsupported types will panic.
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func Eq(a interface{}, b interface{}) bool {
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av := reflect.ValueOf(a)
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bv := reflect.ValueOf(b)
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switch av.Kind() {
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case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
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panic("Eq called on unsupported type")
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return av.Int() == bv.Int()
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case reflect.String:
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return av.String() == bv.String()
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}
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return false
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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")
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t.Funcs(template.FuncMap{
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"trim": strings.TrimSpace,
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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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template.Must(t.Parse(text))
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return t.Execute(w, data)
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}
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