chore: system env support added (#5)

README.md

@@ -32,21 +32,21 @@ Download and install executable binary from GitHub releases page.
 
 ### Linux Installation
 ```sh
-curl -sL https://github.com/tech-thinker/chatz/releases/download/v1.1.0/chatz-linux-amd64 -o chatz
+curl -sL https://github.com/tech-thinker/chatz/releases/download/v1.1.1/chatz-linux-amd64 -o chatz
 chmod +x chatz
 sudo mv chatz /usr/bin
 ```
 
 ### MacOS Installation
 ```sh
-curl -sL https://github.com/tech-thinker/chatz/releases/download/v1.1.0/chatz-darwin-amd64 -o chatz
+curl -sL https://github.com/tech-thinker/chatz/releases/download/v1.1.1/chatz-darwin-amd64 -o chatz
 chmod +x chatz
 sudo mv chatz /usr/bin
 ```
 
 ### Windows Installation
 ```sh
-curl -sL https://github.com/tech-thinker/chatz/releases/download/v1.1.0/chatz-windows-amd64.exe -o chatz.exe
+curl -sL https://github.com/tech-thinker/chatz/releases/download/v1.1.1/chatz-windows-amd64.exe -o chatz.exe
 chatz.exe
 ```
 
@@ -102,6 +102,16 @@ CONNECTION_URL=<redis-connection-url>
 CHANNEL_ID=<redis-publish-channel>
 ```
 
+### System Environment Support
+Chatz also support system environment variable. To use system environment variable then use `--from-env` or `-e` flag.
+Name of the environment variable is same as `chatz.ini` config key, for example `export PROVIDER=slack`.
+
+```sh
+chatz -e "Test"
+# Or
+chatz --from-env "Test"
+```
+
 ## Usage
 - Send message using `default` profile
 ```sh

main.go

@@ -21,6 +21,7 @@ func main() {
     var profile string
     var threadId string
     var output bool
+    var fromEnv bool
 
     app := cli.NewApp()
     app.Name = "chatz"
@@ -52,6 +53,12 @@ func main() {
             Usage: "Print the version number",
             Destination: &version,
         },
+        &cli.BoolFlag{
+            Name: "from-env",
+            Aliases: []string{"e"},
+            Usage: "To use config from environment variables",
+            Destination: &fromEnv,
+        },
     }
     app.Action = func(ctx *cli.Context) error {
         if version {
@@ -75,7 +82,7 @@ func main() {
             message = fmt.Sprintf("%s %s",message, a)
         }
 
-        env, err := utils.LoadEnv(profile)
+        env, err := utils.LoadEnv(profile, fromEnv)
         if err!=nil {
             return nil
         }

utils/common.go

@@ -10,7 +10,39 @@ import (
 )
 
 
-func LoadEnv(profile string) (*config.Config, error) {
+func LoadEnv(profile string, fromEnv bool) (*config.Config, error) {
+    if fromEnv {
+        return loadEnvFromSystemEnv()
+    } else {
+        return loadEnvFromFile(profile)
+    }
+}
+
+func loadEnvFromSystemEnv() (*config.Config, error) {
+    v := viper.New()
+    v.AutomaticEnv()
+
+    // Get values from system environment
+    provider := v.GetString("PROVIDER")
+    token := v.GetString("TOKEN")
+    channelId := v.GetString("CHANNEL_ID")
+    webHookURL := v.GetString("WEB_HOOK_URL")
+    chatId := v.GetString("CHAT_ID")
+    connectionURL := v.GetString("CONNECTION_URL")
+
+    var env config.Config
+
+    env.Provider = provider
+    env.WebHookURL = webHookURL
+    env.Token = token
+    env.ChannelId = channelId
+    env.ChatId = chatId
+    env.ConnectionURL = connectionURL
+
+    return &env, nil
+}
+
+func loadEnvFromFile(profile string) (*config.Config, error) {
     // Get the home directory of the user
     homeDir, err := os.UserHomeDir()
     if err != nil {
@@ -34,7 +66,7 @@ func LoadEnv(profile string) (*config.Config, error) {
 
     // Get values from the INI file
     provider := viper.GetString(fmt.Sprintf("%s.PROVIDER", profile))
-    slackToken := viper.GetString(fmt.Sprintf("%s.TOKEN", profile))
+    token := viper.GetString(fmt.Sprintf("%s.TOKEN", profile))
     channelId := viper.GetString(fmt.Sprintf("%s.CHANNEL_ID", profile))
     webHookURL := viper.GetString(fmt.Sprintf("%s.WEB_HOOK_URL", profile))
     chatId := viper.GetString(fmt.Sprintf("%s.CHAT_ID", profile))
@@ -44,7 +76,7 @@ func LoadEnv(profile string) (*config.Config, error) {
     var env config.Config
     env.Provider = provider
     env.WebHookURL = webHookURL
-    env.Token = slackToken
+    env.Token = token
     env.ChannelId = channelId
     env.ChatId = chatId
     env.ConnectionURL = connectionURL