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added SortCommands to enable sorting of sub commands #144

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added SortCommands to enable sorting of sub commands #144

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20 changes: 20 additions & 0 deletions cmd.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ package kingpin

import (
"fmt"
"sort"
"strings"
)

Expand Down Expand Up @@ -181,6 +182,25 @@ func (c *cmdGroup) have() bool {
return len(c.commands) > 0
}

// SortCommand sort the command list lexicographically
// (affect usage printing)
// if recursive, it will apply the sort also on each sub-command
func (c *cmdGroup) SortCommands(recursive bool) {
names := c.cmdNames()
sort.Strings(names)
for i, cmd := range names {
c.commandOrder[i] = c.commands[cmd]
}

if !recursive {
return
}

for _, cmd := range c.commandOrder {
cmd.SortCommands(true)
}
}

type CmdClauseValidator func(*CmdClause) error

// A CmdClause is a single top-level command. It encapsulates a set of flags
Expand Down