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|
package cli
import (
"bytes"
"regexp"
"strings"
"github.com/mitchellh/cli"
"github.com/mitchellh/go-glint"
)
// formatHelp takes a raw help string and attempts to colorize it automatically.
func formatHelp(v string) string {
// Trim the empty space
v = strings.TrimSpace(v)
var buf bytes.Buffer
d := glint.New()
d.SetRenderer(&glint.TerminalRenderer{
Output: &buf,
// We set rows/cols here manually. The important bit is the cols
// needs to be wide enough so glint doesn't clamp any text and
// lets the terminal just autowrap it. Rows doesn't make a big
// difference.
Rows: 10,
Cols: 180,
})
for _, line := range strings.Split(v, "\n") {
// Usage: prefix lines
prefix := "Usage: "
if strings.HasPrefix(line, prefix) {
d.Append(glint.Layout(
glint.Style(
glint.Text(prefix),
glint.Color("lightMagenta"),
),
glint.Text(line[len(prefix):]),
).Row())
continue
}
// Alias: prefix lines
prefix = "Alias: "
if strings.HasPrefix(line, prefix) {
d.Append(glint.Layout(
glint.Style(
glint.Text(prefix),
glint.Color("lightMagenta"),
),
glint.Text(line[len(prefix):]),
).Row())
continue
}
// A header line
if reHelpHeader.MatchString(line) {
d.Append(glint.Style(
glint.Text(line),
glint.Bold(),
))
continue
}
// If we have a command in the line, then highlight that.
if matches := reCommand.FindAllStringIndex(line, -1); len(matches) > 0 {
var cs []glint.Component
idx := 0
for _, match := range matches {
start := match[0] + 1
end := match[1] - 1
cs = append(
cs,
glint.Text(line[idx:start]),
glint.Style(
glint.Text(line[start:end]),
glint.Color("lightMagenta"),
),
)
idx = end
}
// Add the rest of the text
cs = append(cs, glint.Text(line[idx:]))
d.Append(glint.Layout(cs...).Row())
continue
}
// Normal line
d.Append(glint.Text(line))
}
d.RenderFrame()
return buf.String()
}
type helpCommand struct {
SynopsisText string
HelpText string
}
func (c *helpCommand) Run(args []string) int {
return cli.RunResultHelp
}
func (c *helpCommand) Synopsis() string {
return strings.TrimSpace(c.SynopsisText)
}
func (c *helpCommand) Help() string {
if c.HelpText == "" {
return c.SynopsisText
}
return formatHelp(c.HelpText)
}
func (c *helpCommand) HelpTemplate() string {
return formatHelp(helpTemplate)
}
var (
reHelpHeader = regexp.MustCompile(`^[a-zA-Z0-9_-].*:$`)
reCommand = regexp.MustCompile(`"vagrant \w+"`)
)
const helpTemplate = `
Usage: {{.Name}} {{.SubcommandName}} SUBCOMMAND
{{indent 2 (trim .Help)}}{{if gt (len .Subcommands) 0}}
Subcommands:
{{- range $value := .Subcommands }}
{{ $value.NameAligned }} {{ $value.Synopsis }}{{ end }}
{{- end }}
`
|
