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selector.go
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selector.go
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// Copyright 2020 Dmitry Ermolov
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"fmt"
"os"
"path/filepath"
"strings"
)
type Selector interface {
MatchString(s string) bool
}
func CompileSelector(glob, homeDir string) (g Selector, err error) {
if strings.HasPrefix(glob, "~/") {
if len(homeDir) == 0 {
err = fmt.Errorf("cannot expand %q pattern, home directory is unknown", homeDir)
return
}
glob = filepath.Join(homeDir, strings.TrimPrefix(glob, "~/"))
}
dir, name := filepath.Split(glob)
check := func(s string) error {
if strings.IndexRune(s, '*') != -1 {
return fmt.Errorf("bad glob: '*' and '**' are supported only as last component of the path")
}
return nil
}
if name == "*" {
err = check(dir)
if err != nil {
return
}
g = starGlob(dir)
} else if name == "**" {
err = check(dir)
if err != nil {
return
}
g = starStarGlob(dir)
} else if strings.ContainsRune(glob, os.PathSeparator) {
err = check(glob)
if err != nil {
return
}
g = noStarGlob(glob)
} else {
err = check(glob)
if err != nil {
return
}
g = baseNameGlob(glob)
}
return
}
type baseNameGlob string
func (g baseNameGlob) MatchString(s string) bool {
return string(g) == filepath.Base(s)
}
type noStarGlob string
func (g noStarGlob) MatchString(s string) bool {
return string(g) == s
}
type starGlob string
func (g starGlob) MatchString(s string) bool {
dir, _ := filepath.Split(s)
return string(g) == dir
}
type starStarGlob string
func (g starStarGlob) MatchString(s string) bool {
return strings.HasPrefix(s, string(g))
}