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join.go
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join.go
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// This file is part of Gopher2600.
//
// Gopher2600 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Gopher2600 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
package resources
import (
"os"
"path/filepath"
"strings"
"github.com/jetsetilly/gopher2600/resources/fs"
)
// JoinPath prepends the supplied path with a with OS/build specific base
// paths, if required.
//
// The function creates all folders necessary to reach the end of sub-path. It
// does not otherwise touch or create the file.
func JoinPath(path ...string) (string, error) {
// join supplied path
p := filepath.Join(path...)
// do not prepend OS/build specific base path if it is already present
b, err := baseResourcePath()
if err != nil {
return "", err
}
if !strings.HasPrefix(p, b) {
p = filepath.Join(b, filepath.Join(path...))
}
// check if path already exists
if _, err := os.Stat(p); err == nil {
return p, nil
}
// create path if necessary
if err := fs.MkdirAll(filepath.Dir(p), 0700); err != nil {
return "", err
}
return p, nil
}