Plumbing flags

link.go

@@ -34,11 +34,17 @@ type link struct {
 	Src string
 }
 
-func preparePath(loc string, force, clobber bool) error {
+func preparePath(loc string, flags int) error {
+	clobber := flags&optClobber == optClobber
+	force := flags&optForce == optForce
+	verbose := flags&optVerbose == optVerbose
+
 	if force {
 		parentDir, _ := path.Split(loc)
 		if _, err := os.Stat(parentDir); os.IsNotExist(err) {
+			if verbose {
 				log.Printf("Force creating path: '%s'", parentDir)
+			}
 			if err := os.MkdirAll(parentDir, 0777); err != nil {
 				return err
 			}
@@ -47,12 +53,16 @@ func preparePath(loc string, force, clobber bool) error {
 
 	if info, _ := os.Lstat(loc); info != nil {
 		if info.Mode()&os.ModeSymlink == os.ModeSymlink {
+			if verbose {
 				log.Printf("Removing symlink: '%s'", loc)
+			}
 			if err := os.Remove(loc); err != nil {
 				return err
 			}
 		} else if clobber {
+			if verbose {
 				log.Print("Clobbering path: '%s'", loc)
+			}
 			if err := os.RemoveAll(loc); err != nil {
 				return err
 			}
@@ -62,7 +72,7 @@ func preparePath(loc string, force, clobber bool) error {
 	return nil
 }
 
-func (this link) install(srcDir, dstDir string) error {
+func (this link) install(srcDir, dstDir string, flags int) error {
 	if len(this.Dst) == 0 {
 		this.Dst = this.Src
 	}
@@ -70,22 +80,17 @@ func (this link) install(srcDir, dstDir string) error {
 	srcPath := path.Join(srcDir, this.Src)
 	dstPath := path.Join(dstDir, this.Dst)
 
-	if !path.IsAbs(dstPath) {
-		return fmt.Errorf("Destination path is not absolute: '%s'", dstPath)
-	}
-
-	if !path.IsAbs(srcPath) {
-		return fmt.Errorf("Source path is not absolute: '%s'", srcPath)
-	}
-
 	if _, err := os.Stat(srcPath); os.IsNotExist(err) {
 		return fmt.Errorf("Source path does not exist in filesystem: '%s'", srcPath)
 	}
 
-	if err := preparePath(dstPath, true, true); err != nil {
+	if err := preparePath(dstPath, flags); err != nil {
 		return err
 	}
 
+	if flags&optVerbose == optVerbose {
 		log.Printf("Linking: '%s' => '%s'", srcPath, dstPath)
+	}
+
 	return os.Symlink(srcPath, dstPath)
 }

main.go

@@ -31,6 +31,7 @@ import (
 	"os"
 	"os/user"
 	"path"
+	"path/filepath"
 )
 
 const (
@@ -53,16 +54,25 @@ func parse(filename string) (*config, error) {
 	return conf, nil
 }
 
-func printUsageAndExit() {
+func fatalUsage() {
 	_, executable := path.Split(os.Args[0])
-	fmt.Errorf("Usage: %s [options] config_file [target_path]", executable)
+	fmt.Printf("Usage: %s [options] config_file [target_path]\n", executable)
 	flag.PrintDefaults()
 	os.Exit(1)
 }
 
+func absPath(path string) string {
+	path, err := filepath.Abs(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return path
+}
+
 func main() {
 	currUsr, err := user.Current()
-	if err == nil {
+	if err != nil {
 		log.Fatal(err)
 	}
 
@@ -87,7 +97,7 @@ func main() {
 	}
 
 	if flag.NArg() == 0 {
-		printUsageAndExit()
+		fatalUsage()
 	}
 
 	conf, err := parse(flag.Arg(0))
@@ -98,17 +108,17 @@ func main() {
 	switch *action {
 	case "install":
 		if flag.NArg() >= 2 {
-			if err := conf.install(flag.Arg(1), *dstDir, *taskName, flags); err != nil {
+			if err := conf.install(absPath(flag.Arg(1)), absPath(*dstDir), *taskName, flags); err != nil {
 				log.Fatal(err)
 			}
 		} else {
-			printUsageAndExit()
+			fatalUsage()
 		}
 	case "uninstall":
-		if err := conf.uninstall(*dstDir, *taskName, flags); err != nil {
+		if err := conf.uninstall(absPath(*dstDir), *taskName, flags); err != nil {
 			log.Fatal(err)
 		}
 	default:
-		printUsageAndExit()
+		fatalUsage()
 	}
 }

task.go

@@ -42,7 +42,7 @@ func (this task) install(srcDir, dstDir string, conf *config, flags int) error {
 	}
 
 	for _, link := range this.Links {
-		if err := link.install(srcDir, dstDir); err != nil {
+		if err := link.install(srcDir, dstDir, flags); err != nil {
 			return err
 		}
 	}