From 9cfe9679c9b05d7180a1b31fb7d7145cc445a20f Mon Sep 17 00:00:00 2001
From: Matthias Hannig <matthias@hannig.cc>
Date: Tue, 16 May 2017 18:26:07 +0200
Subject: [PATCH] started with config loading

---
 backend/config.go      | 71 ++++++++++++++++++++++++++++++++++++++++++
 backend/config_test.go | 12 +++++++
 2 files changed, 83 insertions(+)
 create mode 100644 backend/config.go
 create mode 100644 backend/config_test.go

diff --git a/backend/config.go b/backend/config.go
new file mode 100644
index 0000000..561a1b7
--- /dev/null
+++ b/backend/config.go
@@ -0,0 +1,71 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"strings"
+
+	"github.com/BurntSushi/toml"
+	"github.com/imdario/mergo"
+)
+
+type ServerConfig struct {
+	Listen string `toml:"listen_http"`
+}
+
+type UiConfig struct {
+	ShowLastReboot bool `toml:"rs_show_last_reboot"`
+}
+
+type SourceConfig struct {
+	Name string
+}
+
+type Config struct {
+	Server ServerConfig
+	Ui     UiConfig
+
+	Sources []SourceConfig
+}
+
+// Try to load configfiles as specified in the files
+// list. For example:
+//
+//    ./etc/alicelg/alice.conf
+//    /etc/alicelg/alice.conf
+//    ./etc/alicelg/alice.local.conf
+//
+func LoadConfigs(configFiles []string) (*Config, error) {
+	config := &Config{}
+	hasConfig := false
+	var confError error
+
+	for _, filename := range configFiles {
+		tmp := &Config{}
+		_, err := toml.DecodeFile(filename, tmp)
+		if err != nil {
+			continue
+		} else {
+			log.Println("Using config file:", filename)
+			hasConfig = true
+			// Merge configs
+			if err := mergo.Merge(config, tmp); err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	if !hasConfig {
+		confError = fmt.Errorf("Could not load any config file")
+	}
+
+	return config, confError
+}
+
+func ConfigOptions(filename string) []string {
+	return []string{
+		strings.Join([]string{"/", filename}, ""),
+		strings.Join([]string{"./", filename}, ""),
+		strings.Replace(filename, ".conf", ".local.conf", 1),
+	}
+}
diff --git a/backend/config_test.go b/backend/config_test.go
new file mode 100644
index 0000000..b376dce
--- /dev/null
+++ b/backend/config_test.go
@@ -0,0 +1,12 @@
+package main
+
+import (
+	"testing"
+)
+
+// Test configuration loading and parsing
+// using the default config
+
+func TestLoadConfigs(t *testing.T) {
+
+}