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Start poking around at implementing a cli library for go
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package clago | ||
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import ( | ||
) | ||
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type Command struct { | ||
Name string | ||
options []Option | ||
} |
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package clago | ||
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import ( | ||
//"testing" | ||
) | ||
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//func TestFun(t *testing.T) { | ||
//c := Command{Name:"example"} | ||
//t.Errorf("Option: %v\n", c) | ||
//} |
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package clago | ||
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import ( | ||
"github.com/Sirupsen/logrus" | ||
) | ||
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var log = logrus.New() | ||
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func init() { | ||
log.Formatter = new(logrus.JSONFormatter) | ||
log.Level = logrus.Debug | ||
} | ||
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type Validator func(interface{}) error | ||
type Option struct { | ||
Name string | ||
Description string | ||
Parser Parser | ||
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validators []Validator | ||
value interface{} | ||
} | ||
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func (o *Option) Set(str string) { | ||
logger := log.WithFields(logrus.Fields{"option": o.Name, "value": str}) | ||
var err error | ||
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logger.Debug("Parsing") | ||
o.value, err = o.Parser.Parse(str) | ||
if err != nil { panic("parse failure") } | ||
logger.WithFields(logrus.Fields{"parsed": o.value}).Debug("Parsed") | ||
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logger.Debug("Validating") | ||
for _, validator := range o.validators { | ||
if err = validator(o.value); err != nil { panic("validate failure") } | ||
} | ||
} | ||
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func (o *Option) Value() interface{} { | ||
return o.value | ||
} | ||
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func (o *Option) AddValidation(v Validator) { | ||
o.validators = append(o.validators, v) | ||
} |
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package clago | ||
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import ( | ||
"strconv" | ||
) | ||
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type Parser int | ||
const ( | ||
String Parser = iota // default parser | ||
Bool | ||
Uint8 | ||
Uint16 | ||
Uint32 | ||
Uint64 | ||
Int8 | ||
Int16 | ||
Int32 | ||
Int64 | ||
Float32 | ||
Float64 | ||
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// Not really sure this is needed yet? ;) | ||
//Complex64 | ||
//Complex128 | ||
) | ||
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func (p Parser) Parse(value string) (interface{}, error) { | ||
switch p { | ||
case Bool: | ||
switch value { | ||
case "true", "yes", "1": return true, nil | ||
default: return false, nil | ||
} | ||
case Uint8: | ||
conv, err := strconv.ParseUint(value, 0, 8) | ||
return uint8(conv), err | ||
case Uint16: | ||
conv, err := strconv.ParseUint(value, 0, 16) | ||
return uint16(conv), err | ||
case Uint32: | ||
conv, err := strconv.ParseUint(value, 0, 32) | ||
return uint32(conv), err | ||
case Uint64: | ||
conv, err := strconv.ParseUint(value, 0, 64) | ||
return uint64(conv), err | ||
case Int8: | ||
conv, err := strconv.ParseInt(value, 0, 8) | ||
return int8(conv), err | ||
case Int16: | ||
conv, err := strconv.ParseInt(value, 0, 16) | ||
return int16(conv), err | ||
case Int32: | ||
conv, err := strconv.ParseInt(value, 0, 32) | ||
return int32(conv), err | ||
case Int64: | ||
conv, err := strconv.ParseInt(value, 0, 64) | ||
return int64(conv), err | ||
case Float32: | ||
conv, err := strconv.ParseFloat(value, 32) | ||
return float32(conv), err | ||
case Float64: | ||
conv, err := strconv.ParseFloat(value, 64) | ||
return float64(conv), err | ||
//case Complex64: | ||
//case Complex128: | ||
case String: | ||
return value, nil | ||
} | ||
return nil, nil | ||
} |
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package clago | ||
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import ( | ||
"testing" | ||
//"reflect" | ||
) | ||
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func TestDefaultParser(t *testing.T) { | ||
p := String | ||
str := "hello" | ||
v, err := p.Parse(str) | ||
if err != nil { | ||
t.Errorf("String failed to parse") | ||
} | ||
if str != v { | ||
t.Errorf("Strings didn't match") | ||
} | ||
} | ||
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func TestNumberParsers(t *testing.T) { | ||
parsers := [...]Parser{ Uint8, Uint16, Uint32, Uint64, Int8, Int16, Int32, Int64, Float32, Float64 } | ||
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for _, p := range parsers { | ||
testSpecificParser(t, p) | ||
} | ||
} | ||
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func testSpecificParser(t *testing.T, p Parser) { | ||
v, err := p.Parse("100") | ||
if err != nil { | ||
t.Errorf("'100' failed to parse") | ||
} | ||
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var ok bool | ||
var equal bool | ||
switch p { | ||
case Uint8: | ||
var i uint8 | ||
i, ok = v.(uint8) | ||
equal = i == uint8(100) | ||
case Uint16: | ||
var i uint16 | ||
i, ok = v.(uint16) | ||
equal = i == uint16(100) | ||
case Uint32: | ||
var i uint32 | ||
i, ok = v.(uint32) | ||
equal = i == uint32(100) | ||
case Uint64: | ||
var i uint64 | ||
i, ok = v.(uint64) | ||
equal = i == uint64(100) | ||
case Int8: | ||
var i int8 | ||
i, ok = v.(int8) | ||
equal = i == int8(100) | ||
case Int16: | ||
var i int16 | ||
i, ok = v.(int16) | ||
equal = i == int16(100) | ||
case Int32: | ||
var i int32 | ||
i, ok = v.(int32) | ||
equal = i == int32(100) | ||
case Int64: | ||
var i int64 | ||
i, ok = v.(int64) | ||
equal = i == int64(100) | ||
case Float32: | ||
var i float32 | ||
i, ok = v.(float32) | ||
equal = i == float32(100) | ||
case Float64: | ||
var i float64 | ||
i, ok = v.(float64) | ||
equal = i == float64(100) | ||
case String: | ||
ok = true | ||
equal = v == "100" | ||
} | ||
if !ok { | ||
t.Errorf("Parse %#v expected to return correct type. Got %t", p, v) | ||
} | ||
if !equal { | ||
t.Errorf("Expected %s == %s", v, "100") | ||
} | ||
} |