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https://github.com/spf13/cobra
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22953d8845
* Replace all non-alphanumerics in active help env var program prefix There are other characters besides the dash that are fine in program names, but are problematic in environment variable names. These include (but are not limited to) period, space, and non-ASCII letters. * Another change in docs to mention non-ASCII-alphanumeric instead of just dash
68 lines
2.8 KiB
Go
68 lines
2.8 KiB
Go
// Copyright 2013-2023 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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package cobra
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import (
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"fmt"
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"os"
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"regexp"
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"strings"
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)
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const (
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activeHelpMarker = "_activeHelp_ "
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// The below values should not be changed: programs will be using them explicitly
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// in their user documentation, and users will be using them explicitly.
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activeHelpEnvVarSuffix = "_ACTIVE_HELP"
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activeHelpGlobalEnvVar = "COBRA_ACTIVE_HELP"
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activeHelpGlobalDisable = "0"
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)
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var activeHelpEnvVarPrefixSubstRegexp = regexp.MustCompile(`[^A-Z0-9_]`)
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// AppendActiveHelp adds the specified string to the specified array to be used as ActiveHelp.
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// Such strings will be processed by the completion script and will be shown as ActiveHelp
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// to the user.
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// The array parameter should be the array that will contain the completions.
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// This function can be called multiple times before and/or after completions are added to
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// the array. Each time this function is called with the same array, the new
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// ActiveHelp line will be shown below the previous ones when completion is triggered.
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func AppendActiveHelp(compArray []string, activeHelpStr string) []string {
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return append(compArray, fmt.Sprintf("%s%s", activeHelpMarker, activeHelpStr))
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}
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// GetActiveHelpConfig returns the value of the ActiveHelp environment variable
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// <PROGRAM>_ACTIVE_HELP where <PROGRAM> is the name of the root command in upper
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// case, with all non-ASCII-alphanumeric characters replaced by `_`.
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// It will always return "0" if the global environment variable COBRA_ACTIVE_HELP
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// is set to "0".
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func GetActiveHelpConfig(cmd *Command) string {
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activeHelpCfg := os.Getenv(activeHelpGlobalEnvVar)
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if activeHelpCfg != activeHelpGlobalDisable {
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activeHelpCfg = os.Getenv(activeHelpEnvVar(cmd.Root().Name()))
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}
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return activeHelpCfg
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}
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// activeHelpEnvVar returns the name of the program-specific ActiveHelp environment
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// variable. It has the format <PROGRAM>_ACTIVE_HELP where <PROGRAM> is the name of the
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// root command in upper case, with all non-ASCII-alphanumeric characters replaced by `_`.
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func activeHelpEnvVar(name string) string {
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// This format should not be changed: users will be using it explicitly.
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activeHelpEnvVar := strings.ToUpper(fmt.Sprintf("%s%s", name, activeHelpEnvVarSuffix))
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activeHelpEnvVar = activeHelpEnvVarPrefixSubstRegexp.ReplaceAllString(activeHelpEnvVar, "_")
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return activeHelpEnvVar
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}
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