github.com/joshdk/godel@v0.0.0-20170529232908-862138a45aee/apps/distgo/pkg/osarch/osarch.go (about)

     1  // Copyright 2016 Palantir Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package osarch
    16  
    17  import (
    18  	"fmt"
    19  	"runtime"
    20  	"strings"
    21  )
    22  
    23  type OSArch struct {
    24  	OS   string
    25  	Arch string
    26  }
    27  
    28  // String returns a string representation of the form "GOOS-GOARCH".
    29  func (o OSArch) String() string {
    30  	return fmt.Sprintf("%v-%v", o.OS, o.Arch)
    31  }
    32  
    33  // Current returns and OSArch that reflects the GOOS/GOARCH value for the current runtime.
    34  func Current() OSArch {
    35  	return OSArch{
    36  		OS:   runtime.GOOS,
    37  		Arch: runtime.GOARCH,
    38  	}
    39  }
    40  
    41  // New returns an OSArch value for the provided input. Returns an error if the provided input is not of the correct
    42  // format, which is defined as two non-empty alphanumeric strings separated by a single hyphen ("-").
    43  func New(input string) (OSArch, error) {
    44  	if parts := strings.Split(input, "-"); len(parts) == 2 && isAlphaNumericOnly(parts[0]) && isAlphaNumericOnly(parts[1]) {
    45  		return OSArch{OS: parts[0], Arch: parts[1]}, nil
    46  	}
    47  	return OSArch{}, fmt.Errorf("not a valid OSArch value: %s", input)
    48  }
    49  
    50  func isAlphaNumericOnly(input string) bool {
    51  	if input == "" {
    52  		return false
    53  	}
    54  	for _, r := range input {
    55  		if !((r >= '0' && r <= '9') || (r >= 'A' && r <= 'Z') || (r >= 'a' && r <= 'z')) {
    56  			return false
    57  		}
    58  	}
    59  	return true
    60  }