github.com/wolfd/bazel-gazelle@v0.14.0/internal/pathtools/path.go (about)

     1  /* Copyright 2018 The Bazel Authors. All rights reserved.
     2  
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7     http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package pathtools
    17  
    18  import (
    19  	"path"
    20  	"path/filepath"
    21  	"strings"
    22  )
    23  
    24  // HasPrefix returns whether the slash-separated path p has the given
    25  // prefix. Unlike strings.HasPrefix, this function respects component
    26  // boundaries, so "/home/foo" is not a prefix is "/home/foobar/baz". If the
    27  // prefix is empty, this function always returns true.
    28  func HasPrefix(p, prefix string) bool {
    29  	return prefix == "" || p == prefix || strings.HasPrefix(p, prefix+"/")
    30  }
    31  
    32  // TrimPrefix returns p without the provided prefix. If p doesn't start
    33  // with prefix, it returns p unchanged. Unlike strings.HasPrefix, this function
    34  // respects component boundaries (assuming slash-separated paths), so
    35  // TrimPrefix("foo/bar", "foo") returns "baz".
    36  func TrimPrefix(p, prefix string) string {
    37  	if prefix == "" {
    38  		return p
    39  	}
    40  	if prefix == p {
    41  		return ""
    42  	}
    43  	return strings.TrimPrefix(p, prefix+"/")
    44  }
    45  
    46  // RelBaseName returns the base name for rel, a slash-separated path relative
    47  // to the repository root. If rel is empty, RelBaseName returns the base name
    48  // of prefix. If prefix is empty, RelBaseName returns the base name of root,
    49  // the absolute file path of the repository root directory. If that's empty
    50  // to, then RelBaseName returns "root".
    51  func RelBaseName(rel, prefix, root string) string {
    52  	base := path.Base(rel)
    53  	if base == "." || base == "/" {
    54  		base = path.Base(prefix)
    55  	}
    56  	if base == "." || base == "/" {
    57  		base = filepath.Base(root)
    58  	}
    59  	if base == "." || base == "/" {
    60  		base = "root"
    61  	}
    62  	return base
    63  }