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package main
import (
"fmt"
"io/ioutil"
"sort"
"gopkg.in/yaml.v2"
)
// Config represents the structure of the yaml file
type Config struct {
URL string `yaml:"url"`
Packages map[string]Package `yaml:"packages"`
}
// Package details the options available for each repo
type Package struct {
Repo string `yaml:"repo"`
}
// ensureAlphabetical checks that the packages are listed alphabetically in the configuration.
func ensureAlphabetical(data []byte) bool {
// A yaml.MapSlice perservers ordering of keys: https://godoc.org/gopkg.in/yaml.v2#MapSlice
var c struct {
Packages yaml.MapSlice `yaml:"packages"`
}
if err := yaml.Unmarshal(data, &c); err != nil {
return false
}
packageNames := make([]string, 0, len(c.Packages))
for _, v := range c.Packages {
name, ok := v.Key.(string)
if !ok {
return false
}
packageNames = append(packageNames, name)
}
return sort.StringsAreSorted(packageNames)
}
// Parse takes a path to a yaml file and produces a parsed Config
func Parse(path string) (*Config, error) {
var c Config
data, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
if err := yaml.Unmarshal(data, &c); err != nil {
return nil, err
}
if !ensureAlphabetical(data) {
return nil, fmt.Errorf("packages in %s must be alphabetically ordered", path)
}
return &c, err
}
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