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|
package main
import (
"encoding/json"
"errors"
"fmt"
"os"
"path/filepath"
"sort"
)
const lockVersion = 1
type Manifest struct {
// Agents to install into; empty means every agent found on this machine.
Agents []string `json:"agents,omitempty"`
Sources map[string]Source `json:"sources"`
}
type Source struct {
// Source is the source as the user gave it, such as getadaa/plugins#main.
Source string `json:"source"`
// Skills limits the source to these skills; empty means all of them.
Skills []string `json:"skills,omitempty"`
}
type Lock struct {
Version int `json:"version"`
Sources map[string]LockedSource `json:"sources"`
}
type LockedSource struct {
URL string `json:"url"`
Rev string `json:"rev"`
// NarHash lets Nix find the source in its store without fetching it
// again. Only recorded when SKILLS_MANAGED_BY is set.
NarHash string `json:"narHash,omitempty"`
// Skills maps each skill's name to its directory within the source.
Skills map[string]string `json:"skills"`
}
func (l LockedSource) shortRev() string {
if len(l.Rev) >= 7 {
return l.Rev[:7]
}
return l.Rev
}
type workspace struct {
manifestPath string
lockPath string
manifest Manifest
lock Lock
}
func manifestPath(flag string) (string, error) {
if flag != "" {
return filepath.Abs(flag)
}
if p := os.Getenv("SKILLS_MANIFEST"); p != "" {
return p, nil
}
return filepath.Join(configDir(), "skills.json"), nil
}
func openWorkspace(path string) (*workspace, error) {
ws := &workspace{
manifestPath: path,
lockPath: filepath.Join(filepath.Dir(path), "skills.lock"),
manifest: Manifest{Sources: map[string]Source{}},
lock: Lock{Version: lockVersion, Sources: map[string]LockedSource{}},
}
if err := readJSON(ws.manifestPath, &ws.manifest); err != nil {
return nil, err
}
if err := readJSON(ws.lockPath, &ws.lock); err != nil {
return nil, err
}
if ws.lock.Version != lockVersion {
return nil, fmt.Errorf("%s has lock version %d, but this skills understands %d; upgrade skills", ws.lockPath, ws.lock.Version, lockVersion)
}
if ws.manifest.Sources == nil {
ws.manifest.Sources = map[string]Source{}
}
if ws.lock.Sources == nil {
ws.lock.Sources = map[string]LockedSource{}
}
return ws, nil
}
func (ws *workspace) save() error {
if err := os.MkdirAll(filepath.Dir(ws.manifestPath), 0o755); err != nil {
return err
}
if err := writeJSON(ws.lockPath, ws.lock); err != nil {
return err
}
return writeJSON(ws.manifestPath, ws.manifest)
}
// sourceNames returns the named sources, or every source when none are named.
func (ws *workspace) sourceNames(only []string) ([]string, error) {
if len(only) > 0 {
for _, n := range only {
if _, ok := ws.manifest.Sources[n]; !ok {
return nil, fmt.Errorf("no source named %q (see `skills list`)", n)
}
}
return only, nil
}
names := make([]string, 0, len(ws.manifest.Sources))
for n := range ws.manifest.Sources {
names = append(names, n)
}
sort.Strings(names)
return names, nil
}
// checkCollisions fails if another source already provides one of skills,
// since both would be installed under the same directory name.
func (ws *workspace) checkCollisions(source string, skills []Skill) error {
for other, l := range ws.lock.Sources {
if other == source {
continue
}
for _, s := range skills {
if _, ok := l.Skills[s.Name]; ok {
return fmt.Errorf("skill %q is already provided by source %q", s.Name, other)
}
}
}
return nil
}
// wanted maps every locked skill to its source.
func (ws *workspace) wanted() map[string]string {
m := map[string]string{}
for src, l := range ws.lock.Sources {
for s := range l.Skills {
m[s] = src
}
}
return m
}
func configDir() string {
if d := os.Getenv("XDG_CONFIG_HOME"); d != "" {
return filepath.Join(d, "skills")
}
home, _ := os.UserHomeDir()
return filepath.Join(home, ".config", "skills")
}
func dataDir() string {
if d := os.Getenv("XDG_DATA_HOME"); d != "" {
return filepath.Join(d, "skills")
}
home, _ := os.UserHomeDir()
return filepath.Join(home, ".local", "share", "skills")
}
func readJSON(path string, v any) error {
data, err := os.ReadFile(path)
if errors.Is(err, os.ErrNotExist) {
return nil
}
if err != nil {
return err
}
if err := json.Unmarshal(data, v); err != nil {
return fmt.Errorf("%s is not valid: %w", path, err)
}
return nil
}
func writeJSON(path string, v any) error {
data, err := json.MarshalIndent(v, "", " ")
if err != nil {
return err
}
tmp := path + ".tmp"
if err := os.WriteFile(tmp, append(data, '\n'), 0o644); err != nil {
return err
}
return os.Rename(tmp, path)
}
|
