Add base structure and logger

config/.gitignore

@@ -0,0 +1 @@
+build

config/Makefile

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+.PHONY: build
+
+build:
+	mkdir -p build/
+	go build -o build/

config/go.mod

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+module git.faercol.me/faercol/http-boot-config/config
+
+go 1.20

config/logger/logger.go

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+package logger
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+const (
+	NC     = "\033[0m"
+	red    = "\033[0;31m"
+	yellow = "\033[0;33m"
+)
+
+const (
+	errorPrefix   = "Error: "
+	fatalPrefix   = "Fatal: "
+	warningprefix = "Warning: "
+)
+
+type SimpleLogger struct {
+	enableColour bool
+}
+
+func (sl *SimpleLogger) printMsg(msg string, dest io.Writer) {
+	if msg[len(msg)-1:] != "\n" {
+		msg = msg + "\n"
+	}
+
+	n, err := fmt.Fprint(dest, msg)
+	if err != nil {
+		panic(fmt.Errorf("failed to write message to %v: %w", dest, err))
+	}
+	if n != len(msg) {
+		panic(fmt.Errorf("failed to write the entire message (%d/%d)", n, len(msg)))
+	}
+}
+
+func (sl *SimpleLogger) colourText(msg string, colour string) string {
+	if !sl.enableColour {
+		return msg
+	}
+	return colour + msg + NC
+}
+
+func (sl *SimpleLogger) Info(msg string) {
+	sl.printMsg(msg, os.Stdout)
+}
+
+func (sl *SimpleLogger) Infof(format string, a ...any) {
+	sl.printMsg(fmt.Sprintf(format, a...), os.Stdout)
+}
+
+func (sl *SimpleLogger) Error(msg string) {
+	sl.printMsg(sl.colourText(errorPrefix+msg, red), os.Stderr)
+}
+
+func (sl *SimpleLogger) Errorf(format string, a ...any) {
+	sl.printMsg(sl.colourText(errorPrefix+fmt.Sprintf(format, a...), red), os.Stderr)
+}
+
+func (sl *SimpleLogger) Warning(msg string) {
+	sl.printMsg(sl.colourText(warningprefix+msg, yellow), os.Stdout)
+}
+
+func (sl *SimpleLogger) Warningf(format string, a ...any) {
+	sl.printMsg(sl.colourText(warningprefix+fmt.Sprintf(format, a...), yellow), os.Stdout)
+}
+
+func (sl *SimpleLogger) Fatal(msg string) {
+	sl.printMsg(sl.colourText(fatalPrefix+msg, red), os.Stderr)
+	os.Exit(1)
+}
+
+func (sl *SimpleLogger) Fatalf(format string, a ...any) {
+	sl.printMsg(sl.colourText(fatalPrefix+fmt.Sprintf(format, a...), red), os.Stderr)
+	os.Exit(1)
+}
+
+func WithColour() *SimpleLogger {
+	return &SimpleLogger{enableColour: true}
+}
+
+func NoColour() *SimpleLogger {
+	return &SimpleLogger{enableColour: false}
+}

config/main.go

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+package main
+
+import "git.faercol.me/faercol/http-boot-config/config/logger"
+
+func main() {
+	l := logger.NoColour()
+
+	l.Info("test message")
+	l.Warning("this is a warning")
+	l.Error("this is an error")
+
+	l.Fatal("this is fatal")
+	l.Info("This should not be displayed")
+}