.gitignore

@@ -1,2 +1,3 @@
 .env
 nekobot
+wishlist.txt

scripts/wishlist

@@ -0,0 +1,57 @@
+#!/bin/sh
+#
+# wishlist records wishlist items
+
+set -exu
+
+cmd="$@"
+wishlist="wishlist.txt"
+
+[ -f "$wishlist" ] || touch "$wishlist"
+
+die() {
+    printf "%s.\n" "$1"
+    exit 1
+}
+
+print_usage() {
+    printf "%s\n" "!neko wishlist <command> <args>
+commands:
+  add <item>    - add a wishlist item
+  remove <item> - remove a wishlist item
+  show          - show the wishlist
+  clear         - clear the wishlist"
+  exit 42
+}
+
+wishlist_add() {
+    item="$(printf "%s" "$@" | sed -E 's/^add +//g')"
+    [ -z "$item" ] && die "specify an item to add"
+    printf "%s\n" "$item" >> wishlist.txt
+    printf "%s\n" "$item added"
+}
+
+wishlist_remove() {
+    item="$(printf "%s" "$@" | sed -E 's/^remove +//g')"
+    [ -z "$item" ] && die "specify an item to remove"
+    sed -E "s/^$item$//g" -i "$wishlist"
+    printf "%s\n" "$item removed"
+}
+
+wishlist_show() {
+    cat "$wishlist"
+    exit 42
+}
+
+wishlist_clear() {
+    printf "" > "$wishlist"
+    printf "%s\n" "wishlist cleared"
+}
+
+case "$cmd" in
+    add*)    wishlist_add "$@"    ;;
+    remove*) wishlist_remove "$@" ;;
+    show)   wishlist_show         ;;
+    clear)  wishlist_clear        ;;
+    *)      print_usage           ;;
+esac