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exit() should support a dying message, closes #261 #266

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Aug 17, 2019
Merged

exit() should support a dying message, closes #261 #266

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12 changes: 10 additions & 2 deletions docs/types/builtin-function.md
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Original file line number Diff line number Diff line change
Expand Up @@ -75,14 +75,22 @@ for input in stdin {
...
```

### exit(code)
### exit(code [, message])

Exists the script with status `code`:
Exits the script with status `code`:

``` bash
exit(99)
```

You can specify a message that's going to be outputted right
before exiting:

``` bash
⧐ exit(99, "Got problems...")
Got problems...%
```

### rand(max)

Returns a random integer number between 0 and `max`:
Expand Down
18 changes: 16 additions & 2 deletions evaluator/functions.go
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Expand Up @@ -396,12 +396,26 @@ func randFn(tok token.Token, args ...object.Object) object.Object {
}

// exit(code:0)
// exit(code:0, message:"Adios!")
func exitFn(tok token.Token, args ...object.Object) object.Object {
err := validateArgs(tok, "exit", args, 1, [][]string{{object.NUMBER_OBJ}})
var err object.Object
var message string

if len(args) == 2 {
err = validateArgs(tok, "exit", args, 2, [][]string{{object.NUMBER_OBJ}, {object.STRING_OBJ}})
message = args[1].(*object.String).Value
} else {
err = validateArgs(tok, "exit", args, 1, [][]string{{object.NUMBER_OBJ}})
}

if err != nil {
return err
}

if message != "" {
fmt.Fprintf(globalEnv.Writer, message)
}

arg := args[0].(*object.Number)
os.Exit(int(arg.Value))
return arg
Expand Down Expand Up @@ -715,7 +729,7 @@ func typeFn(tok token.Token, args ...object.Object) object.Object {
return &object.String{Token: tok, Value: string(args[0].Type())}
}

// split(string:"hello")
// split(string:"hello world!", sep:" ")
func splitFn(tok token.Token, args ...object.Object) object.Object {
err := validateArgs(tok, "split", args, 2, [][]string{{object.STRING_OBJ}, {object.STRING_OBJ}})
if err != nil {
Expand Down