Add example with lua built-in function

.gitignore

@@ -1,6 +1,2 @@
 /01-LoadJsonFile
-/02-TestLuaScript
-/03-UseGoFuncInLua
-/doll
-/doll-master
 /*.exe

Makefile

@@ -2,20 +2,22 @@
 
 GOOPTS=CGO_ENABLED=0
 BUILDOPTS=-ldflags="-s -w" -a -gcflags=all=-l -trimpath -buildvcs=false
-MYNAME1=doll-master
+MYNAME1=doll
+MYNAME2=doll-master
 BINARY1=${MYNAME1}
-UNIX_BINARY1=${MYNAME1}
-WINDOWS_BINARY1=${MYNAME1}.exe
-MYNAME2=doll
 BINARY2=${MYNAME2}
+UNIX_BINARY1=${MYNAME1}
 UNIX_BINARY2=${MYNAME2}
+WINDOWS_BINARY1=${MYNAME1}.exe
 WINDOWS_BINARY2=${MYNAME2}.exe
-RMCMD=rm -rf
 EXAMPLE01=01-LoadJsonFile
 EXAMPLE02=02-TestLuaScript
 EXAMPLE03=03-UseGoFuncInLua
 
-# On windows binary name can depend not only on platform selected, but target too, we need no .exe suffix for linux bin.
+RMCMD=rm -rf
+
+# На windows имя бинарника может зависеть не только от платформы, но и от выбранной цели, для linux-а суффикс .exe
+# не нужен
 ifeq ($(OS),Windows_NT)
 ifdef GOOS
 ifeq ($(GOOS),windows)
@@ -34,7 +36,7 @@ RMCMD=DEL /Q /F
 endif
 endif
 
-# Set newline symbol explicitly to aboud undefined behaviour in windows.
+# Явно определяем символ новой строки, чтобы избежать неоднозначности на windows
 define IFS
 
 endef
@@ -62,7 +64,7 @@ else  # not ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 endif # ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 else  # not  ($(OS),Windows_NT)
 	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${BINARY1} ./cmd/${MYNAME1}
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${BINARY1} ./cmd/${MYNAME2}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${BINARY2} ./cmd/${MYNAME2}
 endif # ifeq ($(OS),Windows_NT)
 
 
@@ -73,27 +75,28 @@ ifeq ($(SHELL),sh.exe)
 	if exist ${WINDOWS_BINARY1} ${RMCMD} ${WINDOWS_BINARY1}
 	if exist ${UNIX_BINARY1} ${RMCMD} ${UNIX_BINARY1}
 	if exist ${WINDOWS_BINARY2} ${RMCMD} ${WINDOWS_BINARY2}
+	if exist ${UNIX_BINARY2} ${RMCMD} ${UNIX_BINARY2}
 	if exist ${EXAMPLE01}.exe ${RMCMD} ${EXAMPLE01}.exe
 	if exist ${EXAMPLE01} ${RMCMD} ${EXAMPLE01}
 	if exist ${EXAMPLE02}.exe ${RMCMD} ${EXAMPLE02}.exe
 	if exist ${EXAMPLE02} ${RMCMD} ${EXAMPLE02}
-		if exist ${EXAMPLE03}.exe ${RMCMD} ${EXAMPLE03}.exe
+	if exist ${EXAMPLE03}.exe ${RMCMD} ${EXAMPLE03}.exe
 	if exist ${EXAMPLE03} ${RMCMD} ${EXAMPLE03}
 else  # not ifeq ($(SHELL),sh.exe)
-	${RMCMD} ./${WINDOWS_BINARY1}
-	${RMCMD} ./${UNIX_BINARY1}
-	${RMCMD} ./${WINDOWS_BINARY2}
-	${RMCMD} ./${UNIX_BINARY2}
-	${RMCMD} ./${EXAMPLE01}.exe
-	${RMCMD} ./${EXAMPLE01}
-	${RMCMD} ./${EXAMPLE02}.exe
-	${RMCMD} ./${EXAMPLE02}
-	${RMCMD} ./${EXAMPLE03}.exe
-	${RMCMD} ./${EXAMPLE03}
+	${RMCMD} ${WINDOWS_BINARY1}
+	${RMCMD} ${UNIX_BINARY1}
+	${RMCMD} ${WINDOWS_BINARY2}
+	${RMCMD} ${UNIX_BINARY2}
+	${RMCMD} ${EXAMPLE01}.exe
+	${RMCMD} ${EXAMPLE01}
+	${RMCMD} ${EXAMPLE02}.exe
+	${RMCMD} ${EXAMPLE02}
+	${RMCMD} ${EXAMPLE03}.exe
+	${RMCMD} ${EXAMPLE03}
 endif # ifeq ($(SHELL),sh.exe)
 else  # not ifeq ($(OS),Windows_NT)
-	${RMCMD} ./${UNIX_BINARY1}
-	${RMCMD} ./${UNIX_BINARY2}
+	${RMCMD} ${BINARY1}
+	${RMCMD} ${BINARY2}
 	${RMCMD} ${EXAMPLE01}
 	${RMCMD} ${EXAMPLE02}
 	${RMCMD} ${EXAMPLE03}
@@ -112,17 +115,17 @@ ifeq ($(OS),Windows_NT)
 ifeq ($(SHELL), sh.exe)
 #       # Vanilla cmd.exe / powershell.
 	SET "CGO_ENABLED=0"
-	go build ${BUILDOPTS} -o ${EXAMPLE01}.exe ./cmd/${EXAMPLE01}
+	go build ${BUILDOPTS} -o ${EXAMPLE01}.exe ./examples/${EXAMPLE01}
 else ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 #       # git-bash
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE01}.exe ./cmd/${EXAMPLE01}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE01}.exe ./examples/${EXAMPLE01}
 else  # not ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 #       # Some other shell.
 #       # TODO: handle it.
 	$(info "-- Dunno how to handle this shell: ${SHELL}")
 endif # ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 else  # not  ($(OS),Windows_NT)
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE01} ./cmd/${EXAMPLE01}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE01} ./examples/${EXAMPLE01}
 endif # ifeq ($(OS),Windows_NT)
 
 
@@ -132,17 +135,17 @@ ifeq ($(OS),Windows_NT)
 ifeq ($(SHELL), sh.exe)
 #       # Vanilla cmd.exe / powershell.
 	SET "CGO_ENABLED=0"
-	go build ${BUILDOPTS} -o ${EXAMPLE02}.exe ./cmd/${EXAMPLE02}
+	go build ${BUILDOPTS} -o ${EXAMPLE02}.exe ./examples/${EXAMPLE02}
 else ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 #       # git-bash
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE02}.exe ./cmd/${EXAMPLE02}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE02}.exe ./examples/${EXAMPLE02}
 else  # not ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 #       # Some other shell.
 #       # TODO: handle it.
 	$(info "-- Dunno how to handle this shell: ${SHELL}")
 endif # ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 else  # not  ($(OS),Windows_NT)
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE02} ./cmd/${EXAMPLE02}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE02} ./examples/${EXAMPLE02}
 endif # ifeq ($(OS),Windows_NT)
 
 
@@ -152,18 +155,18 @@ ifeq ($(OS),Windows_NT)
 ifeq ($(SHELL), sh.exe)
 #       # Vanilla cmd.exe / powershell.
 	SET "CGO_ENABLED=0"
-	go build ${BUILDOPTS} -o ${EXAMPLE03}.exe ./cmd/${EXAMPLE03}
+	go build ${BUILDOPTS} -o ${EXAMPLE03}.exe ./examples/${EXAMPLE03}
 else ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 #       # git-bash
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE03}.exe ./cmd/${EXAMPLE03}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE03}.exe ./examples/${EXAMPLE03}
 else  # not ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 #       # Some other shell.
 #       # TODO: handle it.
 	$(info "-- Dunno how to handle this shell: ${SHELL}")
 endif # ifeq (,$(findstring(Git/usr/bin/sh.exe, $(SHELL))))
 else  # not  ($(OS),Windows_NT)
-	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE03} ./cmd/${EXAMPLE03}
+	CGO_ENABLED=0 go build ${BUILDOPTS} -o ${EXAMPLE03} ./examples/${EXAMPLE03}
 endif # ifeq ($(OS),Windows_NT)
 
 
-# vim: set ft=make noet ai ts=4 sw=4 sts=4:
+# vim: set ft=make noet ai ts=4 sw=4 sts=4:

example_data/01-config.json

@@ -1,4 +1,4 @@
 {
 	"loglevel": "info",
 	"logfile": "/var/log/messages"
-}
+}

examples/01-LoadJsonFile/main.go

@@ -9,21 +9,14 @@ import (
 )
 
 func main() {
-	// Init log subsystem.
-	log.Init("info", os.Stderr)
-
 	file := "example_data/01-config.json"
 
-	// Load the Lua script file.
-	log.Infof("Loading %s", file)
+	log.Init("info", os.Stderr)
+	log.Infof("loading %s", file)
 
-	data, err := doll.LoadJsonFile(file)
+	data := doll.LoadJsonFile(file)
 
-	if err != nil {
-		log.Fatalf("Unable to unmarshal %s to map: %s", file, err)
-	}
-
-	log.Infof("Map unmarshalled from %s", file)
+	log.Infof("data from %s", file)
 
 	spew.Dump(data)
 }

examples/02-TestLuaScript/main.go

@@ -30,7 +30,9 @@ func main() {
 
 	log.Info("Evaluating Lua code")
 	if err := L.DoString(string(luaCode)); err != nil {
-		log.Fatalf("Error evaluating Lua code: %s", err)
+		log.Errorf("Error evaluating Lua code: %s", err)
+
+		os.Exit(1)
 	}
 }
 

examples/03-UseGoFuncInLua/main.go

@@ -1,6 +1,6 @@
 package main
 
-// This exmple taken from https://otm.github.io/2015/07/embedding-lua-in-go/ .
+// https://otm.github.io/2015/07/embedding-lua-in-go/
 
 import (
 	"doll/internal/log"

internal/doll/jsonfile.go

@@ -1,30 +1,30 @@
 package doll
 
 import (
+	"doll/internal/log"
 	"encoding/json"
-	"fmt"
 	"os"
 )
 
 // LoadJsonFile loads data from json to Instance global variable map.
-func LoadJsonFile(file string) (map[string]any, error) {
+func LoadJsonFile(file string) map[string]any {
 	var (
-		err   error
-		data  []byte
-		myMap map[string]any
+		err  error
+		data []byte
 	)
 
 	data, err = os.ReadFile(file)
 
 	if err != nil {
-		return myMap, fmt.Errorf("Unable to load %s: %w", file, err)
+		log.Fatalf("Unable to load %s: %s", file, err)
 	}
 
-	if err = json.Unmarshal([]byte(data), &myMap); err != nil {
-		return myMap, fmt.Errorf("Unable to unmarshal JSON data from %s: %w", file, err)
+	err = json.Unmarshal([]byte(data), &Instance)
+	if err != nil {
+		log.Fatalf("Unable to marshal JSON data from %s: %s", file, err)
 	}
 
-	return myMap, err
+	return Instance
 }
 
 /* vim: set ft=go noet ai ts=4 sw=4 sts=4: */

internal/serverConfig/readConfig.go

@@ -1,4 +1,4 @@
-package serverSonfig
+package serverConfig
 
 import (
 	"encoding/json"