4 files changed, 246 insertions, 0 deletions
diff --git a/plugins/inventory/Makefile b/plugins/inventory/Makefile
new file mode 100644
index 0000000..a665b55
--- /dev/null
+++ b/plugins/inventory/Makefile
@@ -0,0 +1,4 @@
+plugins/inventory/inventory.so: plugins/inventory/inventory.c plugins/inventory/inventory.h plugins/game/game.h
+	cc -g -shared -fpic -o plugins/inventory/inventory.so plugins/inventory/inventory.c
+
+PLUGINS := ${PLUGINS} plugins/inventory/inventory.so
diff --git a/plugins/inventory/dependencies.txt b/plugins/inventory/dependencies.txt
new file mode 100644
index 0000000..dc22e61
--- /dev/null
+++ b/plugins/inventory/dependencies.txt
@@ -0,0 +1 @@
+game
diff --git a/plugins/inventory/inventory.c b/plugins/inventory/inventory.c
new file mode 100644
index 0000000..9923561
--- /dev/null
+++ b/plugins/inventory/inventory.c
@@ -0,0 +1,210 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "../inventory/inventory.h"
+
+static struct color gray;
+static struct color darkgray;
+
+static bool use_item(struct itemstack *stack)
+{
+	(void) stack;
+	return true;
+}
+
+struct inventory player_inventory = {NULL};
+
+static int selected_index = 0;
+
+void inventory_add(struct inventory *self, struct itemstack stack)
+{
+	struct list **ptr = &self->stacks;
+
+	if (stack.item->stackable) {
+		for (; *ptr != NULL; ptr = &(*ptr)->next) {
+			struct itemstack *other = (*ptr)->element;
+			if (other->item == stack.item) {
+				other->count += stack.count;
+				return;
+			}
+		}
+	}
+
+	struct itemstack *buf = make_buffer(&stack, sizeof(struct itemstack));
+	*ptr = add_element(*ptr, buf);
+
+	if (buf->item->on_create)
+		buf->item->on_create(buf);
+}
+
+/*
+
+bool inventory_remove(struct inventory *self, struct itemstack *stack)
+{
+	stack.count = -stack.count;
+
+	for (struct list **ptr = &self->stacks; *ptr != NULL; ) {
+		struct itemstack *other = (*ptr)->element;
+
+		if (other->item == stack.item) {
+			stack.count += other->count;
+
+			if (stack.count > 0) {
+				other->count = stack.count;
+				return true;
+			} else {
+				struct list *next = ptr->next;
+
+				other->count = 0;
+
+				if (other->item->on_destroy)
+					other->item->on_destroy(other);
+
+				free(other);
+				free(*ptr);
+
+				*ptr = next;
+				continue;
+			}
+		}
+
+		ptr = &(*ptr)->next;
+	}
+
+	return false;
+}
+
+*/
+
+static void decrease_item_count(struct list **ptr, struct itemstack *stack)
+{
+	stack->count--;
+
+	if (stack->count == 0) {
+		struct list *next = (*ptr)->next;
+
+		if (stack->item->on_destroy)
+			stack->item->on_destroy(stack);
+
+		if (stack->meta)
+			free(stack->meta);
+
+		free(stack);
+		free(*ptr);
+
+		*ptr = next;
+	}
+}
+
+bool inventory_remove(struct inventory *self, struct item *item)
+{
+	for (struct list **ptr = &self->stacks; *ptr != NULL; ptr = &(*ptr)->next) {
+		struct itemstack *stack = (*ptr)->element;
+
+		if (stack->item == item) {
+			decrease_item_count(ptr, stack);
+
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static void handle_enter()
+{
+	int i = 0;
+
+	for (struct list **ptr = &player_inventory.stacks; *ptr != NULL; ptr = &(*ptr)->next, i++) {
+		if (i == selected_index) {
+			struct itemstack *stack = (*ptr)->element;
+
+			if (stack->item->on_use && stack->item->on_use(stack))
+				decrease_item_count(ptr, stack);
+
+			return;
+		}
+	}
+}
+
+static void handle_arrow()
+{
+	char c = fgetc(stdin);
+	if (c == '[') {
+		char dir = fgetc(stdin);
+
+		int count = 0;
+
+		for (struct list *ptr = player_inventory.stacks; ptr != NULL; ptr = ptr->next)
+			count++;
+
+		if (count == 0)
+			return;
+
+		switch (dir) {
+			case 'A':
+				selected_index--;
+
+				if (selected_index < 0)
+					selected_index = count - 1;
+				break;
+			case 'B':
+				selected_index++;
+
+				if (selected_index >= count)
+					selected_index = 0;
+
+				break;
+		}
+	} else {
+		ungetc(c, stdin);
+	}
+}
+
+static void render_inventory(struct winsize ws)
+{
+	printf("\e[3;0H");
+
+	printf(" \e[1mInventory\e[21m\n");
+
+	set_color(gray, false);
+
+	int i = 0;
+	for (struct list *ptr = player_inventory.stacks; ptr != NULL; ptr = ptr->next, i++) {
+		struct itemstack *stack = ptr->element;
+
+		if (i == selected_index) {
+			printf(" \e[39m→ ");
+			set_color(gray, false);
+		} else {
+			printf("   ");
+		}
+
+		printf("%s", stack->item->name);
+
+		if (stack->count > 1) {
+			set_color(darkgray, false);
+			printf(" (x%u)", stack->count);
+			set_color(gray, false);
+		}
+
+		printf("\n");
+	}
+}
+
+__attribute__ ((constructor)) static void init()
+{
+	gray = get_color("#9E9E9E");
+	darkgray = get_color("#555555");
+
+	register_render_component(&render_inventory);
+
+	register_input_handler('\033', (struct input_handler) {
+		.run_if_dead = false,
+		.callback = &handle_arrow,
+	});
+
+	register_input_handler('\n', (struct input_handler) {
+		.run_if_dead = false,
+		.callback = &handle_enter,
+	});
+}
diff --git a/plugins/inventory/inventory.h b/plugins/inventory/inventory.h
new file mode 100644
index 0000000..437ffb6
--- /dev/null
+++ b/plugins/inventory/inventory.h
@@ -0,0 +1,31 @@
+#ifndef _INVENTORY_H_
+#define _INVENTORY_H_
+#include "../game/game.h"
+
+struct itemstack
+{
+	struct item *item;
+	int count;
+	void *meta;
+};
+
+struct item
+{
+	char *name;
+	bool stackable;
+
+	bool (*on_use)(struct itemstack *stack);
+	void (*on_destroy)(struct itemstack *stack);
+	void (*on_create)(struct itemstack *stack);
+};
+
+struct inventory
+{
+	struct list *stacks;
+};
+
+void inventory_add(struct inventory *self, struct itemstack stack);
+bool inventory_remove(struct inventory *self, struct item *item);
+
+extern struct inventory player_inventory;
+#endif