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package cache
import (
"bufio"
"errors"
"git.ewy.one/pik/model"
"git.ewy.one/pik/paths"
"io"
"io/fs"
"os"
"path"
"strings"
)
type Cache struct {
Entries []Entry
}
type cacheInit struct{}
// Path is the file path to the "contexts" cache file
var Path string
// FsPath is the Path with the leading slash removed, to be opened from fs.FS
var FsPath string
var Init model.Initializer = &cacheInit{}
func (i *cacheInit) Init() error {
Path = path.Join(paths.Cache, "contexts")
FsPath = Path[1:]
return nil
}
// Merge combines two caches and filters duplicate keys
func (c *Cache) Merge(other *Cache) *Cache {
if other == nil && c != nil {
return c
}
if c == nil && other != nil {
return other
}
if c == nil {
return nil
}
mp := make(map[string]string)
for _, e := range append(c.Entries, other.Entries...) {
mp[e.Path] = e.Label
}
result := &Cache{}
for p, l := range mp {
result.Entries = append(result.Entries, Entry{Label: l, Path: p})
}
return result
}
type Entry struct {
Path string
Label string
}
var Empty = Cache{}
var UnexpectedEntryError = errors.New("unexpected cache entry")
// LoadFile creates a Cache from a file or an empty one if the file does not exist
// this handles opening a reader for Unmarshal
func LoadFile(root fs.FS, path string) (*Cache, error) {
fd, err := root.Open(path)
if errors.Is(err, fs.ErrNotExist) {
return nil, nil
} else if err != nil {
return nil, err
}
if fd != nil {
defer fd.Close()
}
return Unmarshal(fd)
}
// Unmarshal attempts to create a Cache from reader content
func Unmarshal(r io.Reader) (*Cache, error) {
c := &Cache{}
scanner := bufio.NewScanner(r)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if line == "" || line[0] == '#' || line[0:2] == "//" {
continue
}
entry := &Entry{}
parts := strings.SplitN(line, "#", 2)
switch len(parts) {
case 2:
entry.Label = strings.TrimSpace(parts[1])
fallthrough
case 1:
entry.Path = strings.TrimSpace(parts[0])
default:
return c, UnexpectedEntryError
}
c.Entries = append(c.Entries, *entry)
}
return c, nil
}
// Marshal returns the file representation of the Cache
func (c *Cache) Marshal() []byte {
b := strings.Builder{}
for _, e := range c.Entries {
b.WriteString(e.Path)
b.WriteString(" # ")
b.WriteString(e.Label)
b.WriteString("\n")
}
return []byte(b.String())
}
func (c *Cache) String() string {
return string(c.Marshal())
}
func New(st *model.State) *Cache {
c := &Cache{}
for _, s := range st.Sources {
c.Entries = append(c.Entries, Entry{
Path: s.Path,
Label: s.Label(),
})
}
return c
}
func Insert(in *model.State) error {
f := os.DirFS("/")
loaded, err := LoadFile(f, FsPath)
if err != nil {
return err
}
insert := New(in)
result := loaded.Merge(insert)
return SaveFile(Path, result)
}
// SaveFile helps you use Save with a file path instead of a reader
func SaveFile(path string, loaded *Cache) error {
fd, err := os.Create(path)
if err != nil {
return err
}
if fd != nil {
defer fd.Close()
}
return Save(fd, loaded)
}
// Save writes a cache to the contexts file
func Save(w io.Writer, loaded *Cache) error {
_, err := w.Write(loaded.Marshal())
return err
}
// LoadState creates a state with model.NewState based on cache content
func LoadState(f fs.FS, cache *Cache, indexers []model.Indexer, runners []model.Runner) (*model.State, []error) {
var locs []string
for _, e := range cache.Entries {
locs = append(locs, e.Path)
}
return model.NewState(f, locs, indexers, runners)
}
// Strip removes the needle's entries from the receiver's entries when they have matching paths.
// used to skip already indexed locations when auto-all-ing
func (c *Cache) Strip(needle Cache) Cache {
var result []Entry
outer:
for _, e := range c.Entries {
for _, t := range needle.Entries {
if t.Path == e.Path {
continue outer
}
}
result = append(result, e)
}
return Cache{
Entries: result,
}
}
|
