DiscoverSQLMigrationsFromFilesystem: assume underlaying fs use '/' as…

[bearsh]

… separator

when DiscoverSQLMigrations() is called, a 'os nativ' fs is assumed, so
convert the path to slash. when opening a file on such a fs, convert to
back from slash to native separator.

#107

[landru29]

As there's nothing new since 2021, I propose a workaround:

import (
	"net/http"
	"path"
)

type fsMove struct {
	folder     string
	originalFS http.FileSystem
}

func newFSMove(originalFS http.FileSystem, folder string) http.FileSystem {
	return fsMove{
		folder:     folder,
		originalFS: originalFS,
	}
}

func (f fsMove) Open(name string) (http.File, error) {
	return f.originalFS.Open(path.Join(f.folder, name))
}

Then, you can use it with:

collection := migrations.NewCollection()
if err := collection.DiscoverSQLMigrationsFromFilesystem(
    newFSMove(migrationFS, "where/are/located/my/embed/files"),
    "",
); err != nil {
	panic(err)
}