search.go

Documentation: cmd/go/internal/load

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package load
     6  
     7  import (
     8  	"path/filepath"
     9  	"strings"
    10  
    11  	"cmd/go/internal/search"
    12  	"cmd/internal/pkgpattern"
    13  )
    14  
    15  // MatchPackage(pattern, cwd)(p) reports whether package p matches pattern in the working directory cwd.
    16  func MatchPackage(pattern, cwd string) func(*Package) bool {
    17  	switch {
    18  	case search.IsRelativePath(pattern):
    19  		// Split pattern into leading pattern-free directory path
    20  		// (including all . and .. elements) and the final pattern.
    21  		var dir string
    22  		i := strings.Index(pattern, "...")
    23  		if i < 0 {
    24  			dir, pattern = pattern, ""
    25  		} else {
    26  			j := strings.LastIndex(pattern[:i], "/")
    27  			dir, pattern = pattern[:j], pattern[j+1:]
    28  		}
    29  		dir = filepath.Join(cwd, dir)
    30  		if pattern == "" {
    31  			return func(p *Package) bool { return p.Dir == dir }
    32  		}
    33  		matchPath := pkgpattern.MatchPattern(pattern)
    34  		return func(p *Package) bool {
    35  			// Compute relative path to dir and see if it matches the pattern.
    36  			rel, err := filepath.Rel(dir, p.Dir)
    37  			if err != nil {
    38  				// Cannot make relative - e.g. different drive letters on Windows.
    39  				return false
    40  			}
    41  			rel = filepath.ToSlash(rel)
    42  			if rel == ".." || strings.HasPrefix(rel, "../") {
    43  				return false
    44  			}
    45  			return matchPath(rel)
    46  		}
    47  	case pattern == "all":
    48  		return func(p *Package) bool { return true }
    49  	case pattern == "std":
    50  		return func(p *Package) bool { return p.Standard }
    51  	case pattern == "cmd":
    52  		return func(p *Package) bool { return p.Standard && strings.HasPrefix(p.ImportPath, "cmd/") }
    53  	default:
    54  		matchPath := pkgpattern.MatchPattern(pattern)
    55  		return func(p *Package) bool { return matchPath(p.ImportPath) }
    56  	}
    57  }
    58
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