From 2c41acab4c97f584e8e199b31dc456194b8d7e6c Mon Sep 17 00:00:00 2001
From: tsne <tsne.dev@outlook.com>
Date: Mon, 6 Jul 2026 16:52:20 +0200
Subject: initial

---
 internal/cli/path_prefix.go | 51 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 internal/cli/path_prefix.go

(limited to 'internal/cli/path_prefix.go')

diff --git a/internal/cli/path_prefix.go b/internal/cli/path_prefix.go
new file mode 100644
index 0000000..355349e
--- /dev/null
+++ b/internal/cli/path_prefix.go
@@ -0,0 +1,51 @@
+package cli
+
+import (
+	"fmt"
+	"path"
+	"strings"
+
+	"github.com/spf13/pflag"
+)
+
+var _ pflag.Value = (*pathPrefixValue)(nil)
+
+type pathPrefixValue struct {
+	p    *string
+	name string
+}
+
+func registerPathPrefixFlag(flags *pflag.FlagSet, p *string, name string, val string, usage string) {
+	*p = val
+	flags.Var(&pathPrefixValue{p, name}, name, usage)
+}
+
+func (v *pathPrefixValue) Type() string   { return "string" }
+func (v *pathPrefixValue) String() string { return *v.p }
+
+func (v *pathPrefixValue) Set(raw string) error {
+	trimmed := strings.Trim(raw, "/")
+	if trimmed == "" {
+		*v.p = ""
+		return nil
+	}
+
+	cleaned := path.Clean(trimmed)
+	if cleaned == "." {
+		*v.p = ""
+		return nil
+	}
+	if cleaned == ".." || strings.HasPrefix(cleaned, "../") {
+		return usageError{fmt.Sprintf("%s %q escapes", v.name, raw)}
+	}
+
+	*v.p = cleaned
+	return nil
+}
+
+func prefixedPath(prefix string, filePath string) string {
+	if prefix == "" {
+		return filePath
+	}
+	return path.Join(prefix, filePath)
+}
-- 
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