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external.go
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external.go
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// Package ca65 provides helpers to create ca65 assembler compatible asm output.
package ca65
import (
"fmt"
"os"
"os/exec"
"runtime"
"strings"
)
const (
assemblerName = "ca65"
linkerName = "ld65"
)
// Config holds the ROM building configuration.
type Config struct {
PrgBase int
PRGSize int
CHRSize int
}
// AssembleUsingExternalApp calls the external assembler and linker to generate a .nes
// ROM from the given asm file.
func AssembleUsingExternalApp(asmFile, objectFile, outputFile string, conf Config) error {
assembler := assemblerName
linker := linkerName
if runtime.GOOS == "windows" {
assembler += ".exe"
linker += ".exe"
}
if _, err := exec.LookPath(assembler); err != nil {
return fmt.Errorf("%s is not installed", assembler)
}
if _, err := exec.LookPath(linker); err != nil {
return fmt.Errorf("%s is not installed", linker)
}
cmd := exec.Command(assembler, asmFile, "-o", objectFile)
if out, err := cmd.CombinedOutput(); err != nil {
return fmt.Errorf("assembling file: %s: %w", strings.TrimSpace(string(out)), err)
}
configFile, err := os.CreateTemp("", "rom"+".*.cfg")
if err != nil {
return fmt.Errorf("creating temp file: %w", err)
}
defer func() {
_ = os.Remove(configFile.Name())
}()
mapperConfig := GenerateMapperConfig(conf)
if err := os.WriteFile(configFile.Name(), []byte(mapperConfig), 0444); err != nil {
return fmt.Errorf("writing linker config: %w", err)
}
cmd = exec.Command(linker, "-C", configFile.Name(), "-o", outputFile, objectFile)
if out, err := cmd.CombinedOutput(); err != nil {
return fmt.Errorf("linking file: %s: %w", string(out), err)
}
return nil
}