feat(completions): add key and store completion helpers

cmd/completions.go

@@ -0,0 +1,83 @@
+package cmd
+
+import (
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+// completeKeys returns key[@store] completions for the current toComplete prefix.
+// It handles three cases:
+//   - No "@" typed yet: return all keys from all stores (as "key@store")
+//   - "@" typed with partial store: return store-scoped completions
+//   - "key@store" with known store: return keys from that store
+func completeKeys(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	store := &Store{}
+	stores, err := store.AllStores()
+	if err != nil || len(stores) == 0 {
+		return nil, cobra.ShellCompDirectiveNoFileComp
+	}
+
+	var completions []string
+	parts := strings.SplitN(toComplete, "@", 2)
+
+	if len(parts) == 2 {
+		// User typed "something@" — complete keys within matching stores.
+		prefix := parts[0]
+		dbFilter := strings.ToLower(parts[1])
+		for _, db := range stores {
+			if !strings.HasPrefix(db, dbFilter) {
+				continue
+			}
+			keys, err := store.Keys(db)
+			if err != nil {
+				continue
+			}
+			for _, k := range keys {
+				if prefix == "" || strings.HasPrefix(k, strings.ToLower(prefix)) {
+					completions = append(completions, k+"@"+db)
+				}
+			}
+		}
+	} else {
+		// No "@" yet — offer key@store for every key in every store.
+		lowerPrefix := strings.ToLower(toComplete)
+		for _, db := range stores {
+			keys, err := store.Keys(db)
+			if err != nil {
+				continue
+			}
+			for _, k := range keys {
+				full := k + "@" + db
+				if strings.HasPrefix(full, lowerPrefix) || strings.HasPrefix(k, lowerPrefix) {
+					completions = append(completions, full)
+				}
+			}
+		}
+	}
+
+	return completions, cobra.ShellCompDirectiveNoFileComp
+}
+
+// completeStores returns store name completions.
+func completeStores(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	store := &Store{}
+	stores, err := store.AllStores()
+	if err != nil {
+		return nil, cobra.ShellCompDirectiveNoFileComp
+	}
+
+	var completions []string
+	lowerPrefix := strings.ToLower(toComplete)
+	for _, db := range stores {
+		if strings.HasPrefix(db, lowerPrefix) {
+			completions = append(completions, db)
+		}
+	}
+	return completions, cobra.ShellCompDirectiveNoFileComp
+}
+
+// completeStoreFlag is a completion function for --store / -s string slice flags.
+func completeStoreFlag(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	return completeStores(cmd, args, toComplete)
+}