1 files changed, 109 insertions, 0 deletions
diff --git a/internal/config/initializer.go b/internal/config/initializer.go
new file mode 100644
index 0000000..f1a9ec4
--- /dev/null
+++ b/internal/config/initializer.go
@@ -0,0 +1,109 @@
+package config
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+)
+
+// Used to initialize the configuration.
+type initializer struct {
+	Common *CommonConfig
+	Server *ServerConfig
+	Client *ClientConfig
+}
+
+func (c *initializer) parseConfig(args *Args) {
+	if strings.ToUpper(args.ConfigFile) == "NONE" {
+		return
+	}
+
+	if args.ConfigFile != "" {
+		c.parseSpecificConfig(args.ConfigFile)
+		return
+	}
+
+	if homeDir, err := os.UserHomeDir(); err != nil {
+		var paths []string
+		paths = append(paths, fmt.Sprintf("%s/.config/dtail/dtail.conf", homeDir))
+		paths = append(paths, fmt.Sprintf("%s/.dtail.conf", homeDir))
+		for _, configPath := range paths {
+			if _, err := os.Stat(configPath); !os.IsNotExist(err) {
+				c.parseSpecificConfig(configPath)
+			}
+		}
+	}
+}
+
+func (c *initializer) parseSpecificConfig(configFile string) {
+	fd, err := os.Open(configFile)
+	if err != nil {
+		panic(fmt.Sprintf("Unable to read config file: %v", err))
+	}
+	defer fd.Close()
+
+	cfgBytes, err := ioutil.ReadAll(fd)
+	if err != nil {
+		panic(fmt.Sprintf("Unable to read config file %s: %v", configFile, err))
+	}
+
+	err = json.Unmarshal([]byte(cfgBytes), c)
+	if err != nil {
+		panic(fmt.Sprintf("Unable to parse config file %s: %v", configFile, err))
+	}
+}
+
+func (c *initializer) transformConfig(args *Args, additionalArgs []string,
+	client *ClientConfig, server *ServerConfig, common *CommonConfig) (*ClientConfig, *ServerConfig, *CommonConfig) {
+	if args.LogDir != "" {
+		common.LogDir = args.LogDir
+	}
+	if strings.Contains(common.LogDir, "~/") {
+		homeDir, err := os.UserHomeDir()
+		if err != nil {
+			panic(err)
+		}
+		common.LogDir = strings.ReplaceAll(common.LogDir, "~/", fmt.Sprintf("%s/", homeDir))
+	}
+	if common.LogStrategy == "" {
+		common.LogStrategy = "daily"
+	}
+
+	if args.LogLevel != "" {
+		common.LogLevel = args.LogLevel
+	} else if args.ServersStr == "" && args.Discovery == "" {
+		// We are in serverless mode. Default log level is WARN.
+		common.LogLevel = "WARN"
+	}
+
+	if args.SSHPort != DefaultSSHPort {
+		common.SSHPort = args.SSHPort
+	}
+	if args.NoColor {
+		client.TermColorsEnable = false
+	}
+
+	if args.Spartan {
+		args.Quiet = true
+		args.NoColor = true
+	}
+
+	if args.Discovery == "" && args.ServersStr == "" {
+		// We are not connecting to any servers.
+		args.Serverless = true
+	}
+
+	// Interpret additional args as file list.
+	if args.What == "" {
+		var files []string
+		for _, file := range flag.Args() {
+			files = append(files, file)
+		}
+		args.What = strings.Join(files, ",")
+	}
+
+	return client, server, common
+}