// Package gotool contains utility functions used to implement the standard
// "cmd/go" tool, provided as a convenience to developers who want to write
// tools with similar semantics.
package gotool

import "go/build"

// Export functions here to make it easier to keep the implementations up to date with upstream.

// DefaultContext is the default context that uses build.Default.
var DefaultContext = Context{
	BuildContext: build.Default,
}

// A Context specifies the supporting context.
type Context struct {
	// BuildContext is the build.Context that is used when computing import paths.
	BuildContext build.Context
}

// ImportPaths returns the import paths to use for the given command line.
//
// The path "all" is expanded to all packages in $GOPATH and $GOROOT.
// The path "std" is expanded to all packages in the Go standard library.
// The path "cmd" is expanded to all Go standard commands.
// The string "..." is treated as a wildcard within a path.
// When matching recursively, directories are ignored if they are prefixed with
// a dot or an underscore (such as ".foo" or "_foo"), or are named "testdata".
// Relative import paths are not converted to full import paths.
// If args is empty, a single element "." is returned.
func (c *Context) ImportPaths(args []string) []string {
	return c.importPaths(args)
}

// ImportPaths returns the import paths to use for the given command line
// using default context.
//
// The path "all" is expanded to all packages in $GOPATH and $GOROOT.
// The path "std" is expanded to all packages in the Go standard library.
// The path "cmd" is expanded to all Go standard commands.
// The string "..." is treated as a wildcard within a path.
// When matching recursively, directories are ignored if they are prefixed with
// a dot or an underscore (such as ".foo" or "_foo"), or are named "testdata".
// Relative import paths are not converted to full import paths.
// If args is empty, a single element "." is returned.
func ImportPaths(args []string) []string {
	return DefaultContext.importPaths(args)
}