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package cache
import (
"bufio"
"errors"
"io"
"io/fs"
"os"
"path"
"pik/model"
"pik/paths"
"strings"
)
type Cache struct {
Entries []Entry
}
func (c Cache) Merge(other Cache) Cache {
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 Path = path.Join(paths.Cache, "contexts")
var UnexpectedEntryError = errors.New("unexpected cache entry")
func Load() (Cache, error) {
fd, err := os.Open(Path)
if errors.Is(err, os.ErrNotExist) {
return Cache{}, nil
} else if err != nil {
return Cache{}, err
}
defer fd.Close()
return FromReader(fd)
}
func FromReader(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
}
func (c Cache) String() string {
b := strings.Builder{}
for _, e := range c.Entries {
b.WriteString(e.Path)
b.WriteString(" # ")
b.WriteString(e.Label)
b.WriteString("\n")
}
return b.String()
}
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 Save(s *model.State) error {
ld, err := Load()
if err != nil {
return err
}
c := New(s).Merge(ld)
return os.WriteFile(Path, []byte(c.String()), os.ModePerm)
}
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)
}
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