feat: lazysecrets list prints everything lazysecrets can find, for fzf and editor pickers (#70)

`lazysecrets list` prints every source, vault and secret lazysecrets can find, one per line, for fzf, editor pickers and scripts: what Go to searches, without the TUI. What's cached prints at once; what's missing or older than `--max-age` loads in the background and streams in. It stops when the reader goes (a pick in fzf), saving what it loaded.

- Text: kind, mark (✗/⚠, ★, ◷ and the provider icon), name, status (why it couldn't be read, or expired / expires in 12d), note, account and link, tab-separated; kind first and account and link last, so new fields go between. Coloured from the theme; `--color never`, `--icons=false`, `--stars=false`, `--recent`, `--notes=false`, `--expiry=false`.
- `--format json`: an object per line, with starred, recent, lastUsed and uses, expires, enabled, note, reference and url too.
- `--kind` lists only some kinds, and doesn't load lists only other kinds need; `--cached` loads nothing.
- `lazysecrets open --action go|copy|show` skips the "what to do" menu and ends in the list, like Go to; `open` and `get` take `--account`, the account list printed, rather than asking which.
- The cache file moved to `internal/cachefile`: saves merge with the file under a lock, so list and the TUI don't undo each other.
- `ui.recentIcon` marks items used lately with ◷ in the TUI's lists too; Recent now means the last 90 days.
- --demo has stars, notes, recent use, and expired, expiring and disabled secrets.
- docs/integration.md documents get, list and an fzf picker; docs/links.md is docs/sharing.md.

Reviewed-on: #70
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/cachefile/cachefile_test.go

@@ -0,0 +1,122 @@
+package cachefile
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.kebcloud.no/keb/lazysecrets/internal/provider"
+)
+
+func list(at time.Time, names ...string) Stamped[[]provider.Container] {
+	var cs []provider.Container
+	for _, n := range names {
+		cs = append(cs, provider.Container{Name: n})
+	}
+	return Stamped[[]provider.Container]{At: at, Value: cs}
+}
+
+func TestSaveMerges(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "cache.json")
+	now := time.Now()
+	all := func(string) bool { return true }
+
+	// The TUI saved two lists.
+	tui := New()
+	tui.Containers["az|a"] = list(now.Add(-time.Hour), "kv-a-old")
+	tui.Containers["az|b"] = list(now.Add(-time.Minute), "kv-b")
+	tui.Cursor["az|b"] = "kv-b"
+	if err := Save(path, tui, all, now); err != nil {
+		t.Fatal(err)
+	}
+	// lazysecrets list loads a again, and c.
+	listed := Read(path)
+	listed.Containers["az|a"] = list(now, "kv-a-new")
+	listed.Containers["az|c"] = list(now, "kv-c")
+	if err := Save(path, listed, all, now); err != nil {
+		t.Fatal(err)
+	}
+	// The TUI saves what it has, older: list's lists stay.
+	if err := Save(path, tui, all, now); err != nil {
+		t.Fatal(err)
+	}
+	f := Read(path)
+	for key, want := range map[string]string{"az|a": "kv-a-new", "az|b": "kv-b", "az|c": "kv-c"} {
+		if got := f.Containers[key].Value; len(got) != 1 || got[0].Name != want {
+			t.Errorf("%s = %v, want %s", key, got, want)
+		}
+	}
+	if f.Cursor["az|b"] != "kv-b" {
+		t.Error("cursor lost")
+	}
+}
+
+func TestSaveDrops(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "cache.json")
+	now := time.Now()
+	f := New()
+	f.Containers["az|old"] = list(now.Add(-MaxAge-time.Hour), "kv-old")
+	f.Containers["gone|x"] = list(now, "kv-gone")
+	f.Containers["az|x"] = list(now, "kv-x")
+	if err := Save(path, f, func(id string) bool { return true }, now); err != nil {
+		t.Fatal(err)
+	}
+	// Signed out of "gone" since: dropped from the file too.
+	if err := Save(path, New(), func(id string) bool { return id == "az" }, now); err != nil {
+		t.Fatal(err)
+	}
+	got := Read(path).Containers
+	if _, ok := got["az|old"]; ok {
+		t.Error("kept a list older than MaxAge")
+	}
+	if _, ok := got["gone|x"]; ok {
+		t.Error("kept a signed-out account's list")
+	}
+	if _, ok := got["az|x"]; !ok {
+		t.Error("dropped a list on disk the save didn't have")
+	}
+}
+
+func TestReadOtherVersion(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "cache.json")
+	f := New()
+	f.Version = Version + 1
+	f.Containers["az|x"] = list(time.Now(), "kv-x")
+	if err := write(path, f); err != nil {
+		t.Fatal(err)
+	}
+	if got := Read(path); len(got.Containers) != 0 || got.Version != Version {
+		t.Errorf("read another version's file: %+v", got)
+	}
+}
+
+func TestSaveDroppedAndCursors(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "cache.json")
+	now := time.Now()
+	all := func(string) bool { return true }
+	f := New()
+	f.Containers["az|bad"] = list(now, "kv-old")
+	f.Cursor["az|x"] = "kv-tui"
+	if err := Save(path, f, all, now); err != nil {
+		t.Fatal(err)
+	}
+	// The TUI fails to load it again and drops it: it stays gone.
+	f = New()
+	f.Dropped = map[string]bool{"az|bad": true}
+	if err := Save(path, f, all, now); err != nil {
+		t.Fatal(err)
+	}
+	if _, ok := Read(path).Containers["az|bad"]; ok {
+		t.Error("a dropped list came back")
+	}
+	// lazysecrets list saves without cursors: the TUI's stay.
+	listed := New()
+	listed.Cursor = nil
+	listed.Containers["az|y"] = list(now, "kv-y")
+	if err := Save(path, listed, all, now); err != nil {
+		t.Fatal(err)
+	}
+	if Read(path).Cursor["az|x"] != "kv-tui" {
+		t.Error("the TUI's cursor was lost")
+	}
+}