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Add word-wrap support, with wrap length provided by the user

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We could try to automatically detect the terminal width and wrap at that
point, but this would increase the binary footprint for all users even
if not using this feature.

Instead, we can allow users to specify their preferred line length limit
(if any), and those who want to bear the cost of checking the terminal
size can do so if they wish. This also makes the feature more testable.

Original patch by Sascha Grunert <sgrunert@suse.com>
This commit is contained in:
Mostyn Bramley-Moore
2022-05-23 08:08:02 +02:00
parent 595cabc60c
commit 4fd56cb22d
3 changed files with 306 additions and 10 deletions
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20
template.go
View File

@@ -4,16 +4,16 @@ package cli
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var AppHelpTemplate = `NAME:
{{.Name}}{{if .Usage}} - {{.Usage}}{{end}}
{{$v := offset .Name 6}}{{wrap .Name 3}}{{if .Usage}} - {{wrap .Usage $v}}{{end}}
USAGE:
{{if .UsageText}}{{.UsageText | nindent 3 | trim}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
{{if .UsageText}}{{wrap .UsageText 3}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
VERSION:
{{.Version}}{{end}}{{end}}{{if .Description}}
DESCRIPTION:
{{.Description | nindent 3 | trim}}{{end}}{{if len .Authors}}
{{wrap .Description 3}}{{end}}{{if len .Authors}}
AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
{{range $index, $author := .Authors}}{{if $index}}
@@ -31,26 +31,26 @@ GLOBAL OPTIONS:{{range .VisibleFlagCategories}}
GLOBAL OPTIONS:
{{range $index, $option := .VisibleFlags}}{{if $index}}
{{end}}{{$option}}{{end}}{{end}}{{end}}{{if .Copyright}}
{{end}}{{wrap $option.String 6}}{{end}}{{end}}{{end}}{{if .Copyright}}
COPYRIGHT:
{{.Copyright}}{{end}}
{{wrap .Copyright 3}}{{end}}
`
// CommandHelpTemplate is the text template for the command help topic.
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var CommandHelpTemplate = `NAME:
{{.HelpName}} - {{.Usage}}
{{$v := offset .HelpName 6}}{{wrap .HelpName 3}}{{if .Usage}} - {{wrap .Usage $v}}{{end}}
USAGE:
{{if .UsageText}}{{.UsageText | nindent 3 | trim}}{{else}}{{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Category}}
{{if .UsageText}}{{wrap .UsageText 3}}{{else}}{{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Category}}
CATEGORY:
{{.Category}}{{end}}{{if .Description}}
DESCRIPTION:
{{.Description | nindent 3 | trim}}{{end}}{{if .VisibleFlagCategories}}
{{wrap .Description 3}}{{end}}{{if .VisibleFlagCategories}}
OPTIONS:{{range .VisibleFlagCategories}}
{{if .Name}}{{.Name}}
@@ -69,10 +69,10 @@ var SubcommandHelpTemplate = `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{if .UsageText}}{{.UsageText | nindent 3 | trim}}{{else}}{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Description}}
{{if .UsageText}}{{wrap .UsageText 3}}{{else}}{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Description}}
DESCRIPTION:
{{.Description | nindent 3 | trim}}{{end}}
{{wrap .Description 3}}{{end}}
COMMANDS:{{range .VisibleCategories}}{{if .Name}}
{{.Name}}:{{range .VisibleCommands}}