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util.go
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util.go
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// dmake - a build tool on top of dcc
//
// Copyright (C) 2017 A.Newman.
//
// This source code is released under version 2 of the GNU Public
// License. See the file LICENSE for details.
//
package main
import (
"bufio"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
)
var (
// File name extensions for the different languages.
//
languageExtension = map[Language][]string{
CplusplusLanguage: {"*.cpp", "*.cc", "*.cxx", "*.c++"},
CLanguage: {"*.c"},
ObjcLanguage: {"*.m"},
ObjcplusplusLanguage: {"*.mm"},
}
// Regular expression to match a definition of a, well-formed,
// C/C++ main() function.
//
// int main()
// int main(void)
// int main(int
//
mainFunctionRegexp = regexp.MustCompile("^[ \t]*(func|int)?[ \t]*main[ \t]*\\((void|int|)")
)
func Getenv(name, defaultValue string) string {
if s := os.Getenv(name); s != "" {
return s
}
return defaultValue
}
func AddDetail(err error, format string, args ...interface{}) error {
return fmt.Errorf("%s (%s)", err, fmt.Sprintf(format, args...))
}
func DefinesMain(path string) bool {
file, err := os.Open(path)
if err != nil {
log.Print(err)
return false
}
defer file.Close()
for scanner := bufio.NewScanner(file); scanner.Scan(); {
line := scanner.Text()
if mainFunctionRegexp.MatchString(line) {
return true
}
}
return false
}
func ObjectFilename(srcfile string, objsdir string) string {
dirname, basename := filepath.Dir(srcfile), filepath.Base(srcfile)
path := filepath.Clean(filepath.Join(filepath.Join(dirname, objsdir), basename))
return platform.ObjFilename(strings.TrimSuffix(path, filepath.Ext(basename)))
}
func DependenciesFilename(ofile string, depsdir string) string {
dirname, basename := filepath.Dir(ofile), filepath.Base(ofile)
if strings.HasSuffix(dirname, objsdir) {
return filepath.Join(dirname, basename)
} else {
return filepath.Join(dirname, depsdir, basename)
}
}
func Glob(pattern string) (filenames []string, matched bool, err error) {
var matches []string
matches, err = filepath.Glob(pattern)
if err != nil {
return
}
if len(matches) > 0 {
filenames = make([]string, 0, len(matches))
for _, name := range matches {
if otherPlatformNamesRegexp.MatchString(name) {
if *debugFlag {
log.Printf("DEBUG: glob ignoring %q", name)
}
continue
}
filenames = append(filenames, name)
}
}
matched = len(filenames) > 0
return
}
func ExpandGlobs(patterns string) ([]string, error) {
var filenames []string
for _, pattern := range strings.Fields(patterns) {
if names, matched, err := Glob(pattern); err != nil {
return nil, err
} else if matched {
filenames = append(filenames, names...)
}
}
return filenames, nil
}
func CreateFile(path string, content string) error {
file, err := os.Create(path)
if err != nil {
return err
}
fmt.Fprint(file, content)
err = file.Close()
if err != nil {
os.Remove(path)
}
return err
}
func SourceFiles() ([]string, Language, error) {
for lang, patterns := range languageExtension {
for _, pattern := range patterns {
paths, matches, err := Glob(pattern)
if err != nil {
return nil, UnknownLanguage, err
}
if matches {
if langflag != UnknownLanguage {
lang = langflag
}
return paths, lang, nil
}
}
}
return nil, UnknownLanguage, nil
}
func FilenameForType(outputtype OutputType, name string) string {
switch outputtype {
case DllOutputType:
return platform.DllFilename(name)
case PluginOutputType:
return platform.PluginFilename(name)
case ExeOutputType:
return platform.ExeFilename(name)
case LibOutputType:
return platform.LibFilename(name)
default:
panic("unexpected outputtype: " + outputtype.String())
}
}
type CwdRestorer struct {
path string
err error
}
func ChangeDirectory(path string) (CwdRestorer, error) {
r := CwdRestorer{}
r.path, r.err = os.Getwd()
if r.err != nil {
r.err = AddDetail(r.err, "os.Getwd")
return r, r.err
}
if r.err = os.Chdir(path); r.err != nil {
r.err = AddDetail(r.err, "os.Chdir %q", path)
}
return r, r.err
}
func (r CwdRestorer) Restore() {
if r.err == nil {
r.err = os.Chdir(r.path)
if r.err != nil {
r.err = AddDetail(r.err, "os.Chdir %q", r.path)
}
}
}
func installWithUsrBinInstall(filename, destdir string, filemode os.FileMode) error {
args := []string{"-c", "-m", fmt.Sprintf("%o", int(filemode)), filename, filepath.Join(destdir, filename)}
if *debugFlag {
log.Printf("RUN: /usr/bin/install %v", args)
}
cmd := exec.Command("/usr/bin/install", args...)
cmd.Stdin, cmd.Stdout, cmd.Stderr = nil, os.Stdout, os.Stderr
return cmd.Run()
}
func installByCopyingFile(filename, destdir string, filemode os.FileMode) error {
dstFilename := filepath.Join(destdir, filename)
if *debugFlag {
log.Printf("COPY: %q -> %q", filename, dstFilename)
}
src, err := os.Open(filename)
if err != nil {
return err
}
defer src.Close()
dst, err := os.OpenFile(dstFilename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, filemode)
if err != nil {
return err
}
_, err = io.Copy(dst, src)
if err != nil {
dst.Close()
os.Remove(dstFilename)
}
return dst.Close()
}