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Add example with lua built-in function

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eleksir
2025-10-27 18:54:51 +03:00
parent b0c28ef87f
commit a2aa5270f0
5 changed files with 111 additions and 23 deletions
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58
Makefile
View File

@@ -12,6 +12,7 @@ WINDOWS_BINARY1=${MYNAME1}.exe
WINDOWS_BINARY2=${MYNAME2}.exe
EXAMPLE01=01-LoadJsonFile
EXAMPLE02=02-TestLuaScript
EXAMPLE03=03-UseGoFuncInLua
RMCMD=rm -rf
@@ -71,29 +72,34 @@ clean:
ifeq ($(OS),Windows_NT)
ifeq ($(SHELL),sh.exe)
# # Vanilla cmd.exe / powershell.
if exist 01-LoadJsonFile.exe ${RMCMD} ${WINDOWS_BINARY1}
if exist 01-LoadJsonFile.exe ${RMCMD} ${UNIX_BINARY1}
if exist 01-LoadJsonFile.exe ${RMCMD} ${WINDOWS_BINARY2}
if exist 01-LoadJsonFile.exe ${RMCMD} ${UNIX_BINARY2}
if exist 01-LoadJsonFile.exe ${RMCMD} 01-LoadJsonFile.exe
if exist 01-LoadJsonFile ${RMCMD} 01-LoadJsonFile
if exist 02-TestLuaScript.exe ${RMCMD} 02-TestLuaScript.exe
if exist 02-TestLuaScript ${RMCMD} 02-TestLuaScript
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} ${RMCMD} ${EXAMPLE03}
else # not ifeq ($(SHELL),sh.exe)
${RMCMD} ${WINDOWS_BINARY1}
${RMCMD} ${UNIX_BINARY1}
${RMCMD} ${WINDOWS_BINARY2}
${RMCMD} ${UNIX_BINARY2}
${RMCMD} ./01-LoadJsonFile.exe
${RMCMD} ./01-LoadJsonFile
${RMCMD} ./02-TestLuaScript.exe
${RMCMD} ./02-TestLuaScript
${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} ${BINARY1}
${RMCMD} ${BINARY2}
${RMCMD} ./01-LoadJsonFile
${RMCMD} ./02-TestLuaScript
${RMCMD} ${EXAMPLE01}
${RMCMD} ${EXAMPLE02}
${RMCMD} ${EXAMPLE03}
endif
@@ -103,7 +109,7 @@ upgrade:
go mod vendor
01-LoadJsonFile: clean
${EXAMPLE01}: clean
ifeq ($(OS),Windows_NT)
# Looks like on windows gnu make explicitly set SHELL to sh.exe, if it was not set.
ifeq ($(SHELL), sh.exe)
@@ -123,7 +129,7 @@ else # not ($(OS),Windows_NT)
endif # ifeq ($(OS),Windows_NT)
02-TestLuaScript: clean
${EXAMPLE02}: clean
ifeq ($(OS),Windows_NT)
# Looks like on windows gnu make explicitly set SHELL to sh.exe, if it was not set.
ifeq ($(SHELL), sh.exe)
@@ -143,4 +149,24 @@ else # not ($(OS),Windows_NT)
endif # ifeq ($(OS),Windows_NT)
${EXAMPLE03}: clean
ifeq ($(OS),Windows_NT)
# Looks like on windows gnu make explicitly set SHELL to sh.exe, if it was not set.
ifeq ($(SHELL), sh.exe)
# # Vanilla cmd.exe / powershell.
SET "CGO_ENABLED=0"
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 ${EXAMPLE03}.exe ./examples/${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 ${EXAMPLE03} ./examples/${EXAMPLE03}
endif # ifeq ($(OS),Windows_NT)
# vim: set ft=make noet ai ts=4 sw=4 sts=4:

2
example_data/02-test.lua
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@@ -1,3 +1,3 @@
print ("Hello World!")
-- vim: set ft=go noet ai ts=4 sw=4 sts=4:
-- vim: set ft=lua noet ai ts=4 sw=4 sts=4:

3
example_data/03-test.lua Normal file
View File

@@ -0,0 +1,3 @@
print("4 * 4 = " .. square(4))
-- vim: set ft=lua noet ai ts=4 sw=4 sts=4:

14
examples/02-TestLuaScript/main.go
View File

@@ -8,11 +8,10 @@ import (
)
func main() {
file := "example_data/02-test.lua"
// Init log subsystem.
log.Init("info", os.Stderr)
L := lua.NewState()
defer L.Close()
file := "example_data/02-test.lua"
// Load the Lua script file.
log.Infof("Loading %s", file)
@@ -22,11 +21,14 @@ func main() {
luaCode, err := os.ReadFile(file)
if err != nil {
log.Errorf("Error reading Lua file %s: %s", file, err)
os.Exit(1)
log.Fatalf("Error reading Lua file %s: %s", file, err)
}
log.Info("Creating new Lua state")
L := lua.NewState()
defer L.Close()
log.Info("Evaluating Lua code")
if err := L.DoString(string(luaCode)); err != nil {
log.Errorf("Error evaluating Lua code: %s", err)

57
examples/03-UseGoFuncInLua/main.go Normal file
View File

@@ -0,0 +1,57 @@
package main
import (
"doll/internal/log"
"os"
lua "github.com/yuin/gopher-lua"
)
// square multiplies number by itself.
func square(L *lua.LState) int {
// get first (1) function argument and convert to int
i := L.ToInt(1)
// make calculation and cast to LNumber
ln := lua.LNumber(i * i)
// Push it to the stack
L.Push(ln)
// Notify that we pushed one value to the stack
return 1
}
func main() {
// Init log subsystem.
log.Init("info", os.Stderr)
file := "example_data/03-test.lua"
// Load the Lua script file.
log.Infof("Loading %s", file)
// We can execute script directly via L.DoFile("./example_data/03-test.lua") but in practice we'll get scripts as
// strings - snippets from templates - so, testing/checking how it works is not use for project.
luaCode, err := os.ReadFile(file)
if err != nil {
log.Fatalf("Error reading Lua file %s: %s", file, err)
}
log.Info("Creating new Lua state")
L := lua.NewState()
defer L.Close()
log.Info("Registering go function as lua built-in function")
L.SetGlobal("square", L.NewFunction(square))
log.Info("Evaluating Lua code")
if err := L.DoString(string(luaCode)); err != nil {
log.Errorf("Error evaluating Lua code: %s", err)
os.Exit(1)
}
}
/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */