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Add pre-Call initialization and validation

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This commit is contained in:
Rob Muhlestein 2022-11-06 22:31:14 -05:00
parent 4ad14d6290
commit cbb7b625a4
1 changed files with 9 additions and 0 deletions
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9
z/cmd.go
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@ -59,6 +59,7 @@ type Cmd struct {
// where the work happens
Caller *Cmd `json:"-"`
Call Method `json:"-"`
Init Method `json:"-"` // before Commands/Call, good for validation
// pass bulk input efficiently (when args won't do)
Input io.Reader
@ -298,6 +299,13 @@ func (x *Cmd) Run() {
return
}
// initialize before delegation and Call
if cmd.Init != nil {
if err := cmd.Init(cmd, args...); err != nil {
ExitError(err)
}
}
// default to first Command if no Call defined
if cmd.Call == nil {
if len(cmd.Commands) > 0 {
@ -339,6 +347,7 @@ func (x *Cmd) Run() {
if cmd.Caller == nil {
cmd.Caller = x
}
if err := cmd.Call(cmd, args...); err != nil {
ExitError(err)
return