feat: Add ability to use ~ tidle in configuration file

We no longer need to provide absolute paths in the configuraion
file.  This does not affect the defaults.

.portsync.example

@@ -1,8 +1,9 @@
 # Path to your local ports directory.
-#base = "/usr/ports"
+#base = "/usr/ports"  # Default
+#base = "~/git/ports"
 
 # Default maintainer used by portscout.
-#maintainer = "ports@FreeBSD.org"
+#maintainer = "ports@FreeBSD.org"  # Default
 
 # By default all packages associated with a
 # maintainer are used.  You can limit this
@@ -12,4 +13,5 @@
 
 # Location in which the Makefile scripts
 # are located.
-#scriptDir = "/usr/lcoal/share/portsync/Mk"
+#scriptDir = "/usr/lcoal/share/portsync/Mk"  # Default
+#scriptDir = "~/Mk"

internal/fetcher/portscout.go

@@ -10,6 +10,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"slices"
 	"strings"
 	"sync"
@@ -87,6 +88,10 @@ func (ps Portscout) Fetch(cmd *cobra.Command) (*Packages, error) {
 
 func (ps Portscout) Transform(cmd *cobra.Command, pkg *Package) (*Package, error) {
 	base := viper.GetString("base")
+	if strings.HasPrefix(base, "~/") {
+		dir, _ := os.UserHomeDir()
+		base = filepath.Join(dir, base[2:])
+	}
 	if !strings.HasSuffix(base, "/") {
 		base += "/"
 	}

internal/mk/mk.go

@@ -9,6 +9,7 @@ package mk
 import (
 	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 
 	. "github.com/lcook/portsync/internal/_package"
@@ -17,6 +18,10 @@ import (
 
 func run(pkg *Package, makefile string) {
 	base := viper.GetString("base")
+	if strings.HasPrefix(base, "~/") {
+		dir, _ := os.UserHomeDir()
+		base = filepath.Join(dir, base[2:])
+	}
 	if !strings.HasSuffix(base, "/") {
 		base += "/"
 	}
@@ -31,6 +36,10 @@ func run(pkg *Package, makefile string) {
 		os.Setenv(k, v)
 	}
 	scriptDir := viper.GetString("scriptdir")
+	if strings.HasPrefix(scriptDir, "~/") {
+		dir, _ := os.UserHomeDir()
+		base = filepath.Join(dir, scriptDir[2:])
+	}
 	if !strings.HasSuffix(scriptDir, "/") {
 		scriptDir += "/"
 	}