feat: support reading CLI options from a config file (#18)

Author: LinuxSuRen

README.md

@@ -99,6 +99,18 @@ List the supported runtimes:
 new-dockerfile --runtime list
 ```
 
+## Read from Config file
+
+In the CI use case, you might need a very common step for generating a `Dockerfile`. You can create a config file for the
+CLI options. The default config file name is `new-dockerfile.yaml`, and it should be in the root directory of your git
+repository. Especially, there are multiple kinds of files, `new-dockerfile` might not be able to it a correct one.
+
+```yaml
+runtime: go
+```
+
+And, the CLI option will overwrite the values from config file.
+
 ## How it Works
 
 The tool searches for common files and directories in your project to determine the runtime and framework.

cmd/new-dockerfile/main.go

@@ -1,7 +1,9 @@
 package main
 
 import (
+	"errors"
 	"fmt"
+	"github.com/spf13/viper"
 	"log/slog"
 	"os"
 	"path/filepath"
@@ -43,11 +45,21 @@ func main() {
 	log := slog.New(handler)
 	df := dockerfile.New(log)
 
+	viper.SetConfigName("new-dockerfile")
+	viper.SetConfigType("yaml")
+	viper.SetConfigType("yml")
+	viper.AddConfigPath(".")
+	if err := viper.ReadInConfig(); err != nil && !errors.As(err, &viper.ConfigFileNotFoundError{}) {
+		log.Error("Fatal error: " + err.Error())
+		os.Exit(1)
+	}
+
 	var (
 		r   runtime.Runtime
 		err error
 	)
 
+	runtimeArg = viper.GetString("runtime")
 	if runtimeArg != "" {
 		runtimes := df.ListRuntimes()
 

go.mod

@@ -6,4 +6,26 @@ require (
 	github.com/lmittmann/tint v1.0.4
 	github.com/pelletier/go-toml v1.9.5
 	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.18.2
+)
+
+require (
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,6 +1,73 @@
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