Add env parsing

.gitignore

@@ -1,3 +1,5 @@
 node_modules
 frontend/dist
 build
+backend/.env
+backend/plan

backend/go.mod

@@ -1,3 +1,5 @@
 module grapher-backend
 
 go 1.23.2
+
+require github.com/joho/godotenv v1.5.1

backend/go.sum

@@ -0,0 +1,2 @@
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

backend/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+var Error *log.Logger
+var Warning *log.Logger
+func init() {
+	log.SetFlags(log.Lmicroseconds | log.Lshortfile)
+	logFile, err := os.Create("main.log")
+	if err != nil {
+		log.Printf("Error creating log file: %v", err)
+		return
+	}
+	logger := io.MultiWriter(os.Stdout, logFile)
+	log.SetOutput(logger)
+
+	Error = log.New(io.MultiWriter(logFile, os.Stderr, os.Stdout),
+		fmt.Sprintf("%sERROR:%s ", "\033[0;101m", "\033[0m"),
+		log.Lmicroseconds|log.Lshortfile)
+	Warning = log.New(io.MultiWriter(logFile, os.Stdout),
+		fmt.Sprintf("%sWarning:%s ", "\033[0;93m", "\033[0m"),
+		log.Lmicroseconds|log.Lshortfile)
+}
+
+var env map[string]string
+
+func main() {
+	envfile := flag.String("envfile", ".env", "")
+	flag.Parse()
+
+	var err error
+	env, err = LoadEnv(*envfile)
+	if err != nil {
+		Error.Printf("Error leading env file: %v", err)
+		return
+	}
+}

backend/utils.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/joho/godotenv"
+)
+
+func LoadEnv(fpath string) (map[string]string, error) {
+	res := make(map[string]string)
+
+	fpath = filepath.Clean(fpath)
+	log.Printf("Trying to open env file at '%s'", fpath)
+
+	file, err := os.Open(fpath)
+	if err != nil {
+		return res, fmt.Errorf("error opening env file: %w", err)
+	}
+	defer file.Close()
+
+	res, err = godotenv.Parse(file)
+	if err != nil {
+		return res, fmt.Errorf("error parsing env file: %w", err)
+	}
+
+	return res, nil
+}