-
Notifications
You must be signed in to change notification settings - Fork 0
/
root.go
85 lines (69 loc) · 2.39 KB
/
root.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/*
Copyright © 2021 NAME HERE <EMAIL ADDRESS>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cmd
import (
"fmt"
"log"
"os"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var (
inputPath string
input *os.File
cfgFile string
)
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "advent-of-code-2021",
Short: "Ben Partridge's Advent of Code 2021",
Long: `Ben Partridge's Advent of Code 2021. Run the command followed by the day
to Execute. e.g. advent-of-code-2021 day1`,
PersistentPreRun: func(cmd *cobra.Command, args []string) {
inputFile, err := os.Open(inputPath)
if err != nil {
log.Fatalf("Error opening input file: %s\n", err.Error())
}
input = inputFile
},
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
cobra.CheckErr(rootCmd.Execute())
}
func init() {
cobra.OnInitialize(initConfig)
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.advent-of-code-2021.yaml)")
rootCmd.PersistentFlags().StringVar(&inputPath, "input-file", "input.txt", "Challenge input file path")
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := os.UserHomeDir()
cobra.CheckErr(err)
// Search config in home directory with name ".advent-of-code-2021" (without extension).
viper.AddConfigPath(home)
viper.SetConfigType("yaml")
viper.SetConfigName(".advent-of-code-2021")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Fprintln(os.Stderr, "Using config file:", viper.ConfigFileUsed())
}
}