Makefile: Create install directories.

Sometimes these directories may not exist.

.gitignore

@@ -2,3 +2,4 @@
 /menu-helper
 /compile_commands.json
 .cache/*
+/*.1.gz

Makefile

@@ -21,6 +21,7 @@ DEFS=
 CFLAGS=$(INCFLAGS) -std=c++20 -Wall -Wextra -Wfatal-errors -Werror
 HDRS=src/util.hpp src/arg_parse.hpp src/db.hpp src/cmd.hpp
 OBJS=src/main.o src/util.o src/arg_parse.o src/db.o src/cmd.o
+DOCS=menu-helper.1
 VERSION=1.0
 
 ifeq ($(PREFIX),)
@@ -39,13 +40,20 @@ endif
 menu-helper: $(OBJS)
 	$(CXX) -o $@ $^ $(LDFLAGS)
 
+menu-helper.1.gz: $(DOCS)
+	gzip -c $< > $@
+
 .PHONY: clean distclean install
 
 clean:
 	$(RM) $(OBJS)
 
 distclean: clean
+	$(RM) menu-helper.1.gz
 	$(RM) menu-helper
 
-install: menu-helper
+install: menu-helper menu-helper.1.gz
+	install -d $(PREFIX)/bin
 	install -m 755 menu-helper $(PREFIX)/bin/
+	install -d $(PREFIX)/share/man/man1
+	install -m 644 menu-helper.1.gz $(PREFIX)/share/man/man1/

README.md

@@ -1,11 +1,157 @@
-# Menu Helper
+# Menu-Helper
 
 A program to manage a database of recipes and help you to pick out meals based
 on filters of ingredients and tags.
 
 ## Usage
 
-Ensure the `XDG_DATA_HOME` variable is set (e.g. to `$HOME/.local/share`).
+Ensure the `XDG_DATA_HOME` variable is set (e.g. to `$HOME/.local/share`) and
+that you have installed the SQLite3 library.
+
+Upon first execution of any command, the program will automatically create the
+database.
+
+### Adding New Recipes
+
+The first thing you're probably going to want to do is to add a new recipe to
+your database. If this database hasn't been created already then the program
+will do it automatically. This is done via the `add` subcommand, which will
+query you about the different attributes you want for your recipe, looking
+something like the following:
+
+```console
+$ menu-helper add
+Name: Linguine Scampi
+Description: A lemony Italian pasta dish.
+Ingredients (comma separated): linguine,shrimp,garlic,parsley,lemon
+Tags (comma separated): italian,lunch
+Creating database in /home/nicolas/.local/share/menu-helper/recipes.db
+```
+
+This will have created your recipe within the database. That last line there is
+merely informative, telling you that the database did not exist and it is not
+being created; if you had a database already and it isn't being found, ensure
+that your `XDG_DATA_HOME` environment variable is properly set.
+
+### Querying Recipes
+
+#### Filtering
+
+Once a recipe or two have been added to your database you may now query them
+filtering based on ingredients and tags. This is done via the `list` command,
+which takes two kinds of arguments, both optional:
+
+- `-i <list>`: Comma-separated list of the ingredients to look for.
+- `-t <list>`: Comma-separated list of the tags to look for.
+
+If neither is specified then all recipes will be listed with their respective
+ID, name, and description:
+
+```console
+$ menu-helper list
+1  |  Linguine Scampi  |  A lemony Italian pasta dish.
+2  |  Garlic Soup  |  A simple monastic soup for cold winters.
+```
+
+However, when one of these arguments is used it filters recipes to only show
+those which include __all__ the ingredients and tags specified:
+
+```console
+$ menu-helper list -i linguine
+1  |  Linguine Scampi  |  A lemony Italian pasta dish.
+```
+
+#### Recipe Information
+
+The IDs shown in the queries above now become useful for the rest of
+Menu-Helper functionality. If you wish to query all stored information about a
+given recipe, this is where you can use the `info` subcommand with the relevant
+ID:
+
+```console
+$ menu-helper info 2
+Name: Garlic Soup
+Description: A simple monastic soup for cold winters.
+ID: 2
+
+Ingredients:
+        - garlic
+        - bread
+        - egg
+
+Tags:
+        - soup
+        - dinner
+        - simple
+
+```
+
+### Removing Recipes
+
+If you end up desiring to remove a recipe for whatever reason, you can do so by
+using the `del` subcommand with the recipe's corresponding ID:
+
+```console
+$ menu-helper del 2
+$ menu-helper list
+1  |  Linguine Scampi  |  A lemony Italian pasta dish.
+```
+
+### Modifying Recipes
+
+#### Name & Description
+
+To correct or otherwise modify the name or description of your recipe, you can
+use the `edit-name` and `edit-description` subcommands. These will prompt you
+for the new name or description respectively and overwrite what was previously
+stored in the database:
+
+```console
+$ menu-helper edit-name 1
+New name: Linguine agli Scampi
+$ menu-helper edit-description 1
+New description: A zesty Italian pasta dish.
+$ menu-helper list
+1  |  Linguine agli Scampi  | A zesty Italian pasta dish.
+```
+
+#### Ingredients/Tags
+
+If there are ingredients/tags which you forgot to add to a recipe, or that you
+added erringly, you can correct this with the following commands:
+
+- `add-ingr <id> <list>`: Add list of comma-separated ingredients `list` to
+  recipe with ID `id`.
+- `rm-ingr <id> <list>`: Remove list of comma-separated ingredients `list` from
+  recipe with ID `id`.
+- `add-tag <id> <list>`: Add list of comma-separated tags `list` to recipe with
+  ID `id`.
+- `rm-tag <id> <list>`: Remove list of comma-separated tags `list` from recipe
+  with ID `id`.
+
+For example, we forgot to add the useful tag to our first recipe (Linguine
+Scampi) that it is a pasta dish. We can do this with the following command:
+
+```console
+$ menu-helper add-tag 1 pasta
+$ menu-helper info 1
+Name: Linguine agli Scampi
+Description: A zesty Italian pasta dish.
+ID: 1
+
+Ingredients:
+        - linguine
+        - shrimp
+        - garlic
+        - parsley
+        - lemon
+
+Tags:
+        - italian
+        - lunch
+        - pasta
+
+```
 
 ## Building
 
@@ -15,10 +161,28 @@ To build the program you will require the following dependencies:
 - SQLite3 C/C++ library
 - Make
 
-Once installed, compile the project with the `make` command.
+Once installed, compile the project with the `make` command. To install simply
+run the `make install` command, optionally appending `PREFIX=...` to change the
+default directory of installation (i.e. `/usr/local/...`).
+
+## Contributing
+
+If you find any issues, feel free to report them on GitHub or send me an E-Mail
+(see my website/profile for the address). I will add these issues to my personal
+Gitea page and (unless specified otherwise) mention you as the person who found
+the issue.
+
+For patches/pull requests, if you open a PR on GitHub I will likely not merge
+directly but instead apply the patches locally (via Git patches, conserving
+authorship), push them to my Gitea repository, which will finally be mirrored to
+GitHub. However, you can save me a bit of work by just sending me the Git
+patches directly (via E-Mail).
+
+If you're looking for a way to contribute, consider having a look at my [To-Do
+list](TODO.md) for the project.
 
 ## License
 
 This program is licensed under the terms & conditions of the GNU General Public
-License version 3 or greater. See the [LICENSE](/LICENSE) file for more
+License version 3 or greater. See the [LICENSE](LICENSE) file for more
 information.

TODO.md

@@ -0,0 +1,16 @@
+# To-Do List
+
+- [X] v1.0
+  - [X] Add basic functionality.
+  - [X] Add more safeguards to avoid bad usage.
+  - [X] Create a man page.
+  - [X] Add more documentation to `help` subcommand.
+  - [X] Properly align output columns from `list` subcommand.
+  - [X] Add feature for editing recipe name and description.
+    - [X] Name
+    - [X] Description
+
+- [ ] v1.1
+  - [ ] Add import/export functionality.
+  - [ ] Allow for writing description in editor.
+  - [ ] Add examples to man page.

menu-helper.1

@@ -0,0 +1,65 @@
+.TH "MENU HELPER" "1" "November 2024" "menu-helper 1.0" "User Commands"
+.SH "NAME"
+menu-helper \- makes choosing meals easier
+.SH "SYNOPSIS"
+.B menu-helper
+<\fICOMMAND\fR> [\fIOPTIONS\fR]
+
+.SH "DESCRIPTION"
+A program to manage a database of recipes and help you pick out meals based on
+filters of ingredients and tags.
+
+.SH "COMMANDS"
+.TP
+.B \fBadd\fR, \fBnew\fR
+Add a new recipe to the database.
+.TP
+.B \fBdel\fR, \fBrm\fR <\fIid\fR>
+Delete recipe with provided \fIid\fR.
+.TP
+.B \fBlist\fR, \fBls\fR [-i <\fIingredients\fR>] [-t <\fItags\fR>]
+List all recipes that contain all \fIingredients\fR an \fItags\fR listed. If
+none are listed, then it prints all recipes stored in the database. Both
+\fIingredients\fR and \fItags\fR are comma-separated lists (e.g.
+"garlic,tomato").
+.TP
+.B \fBinfo\fR <\fIid\fR>
+Show all stored information on recipe with provided \fIid\fR.
+.TP
+.B \fBedit-name\fR <\fIid\fR>
+Change the name of the recipe with the provided \fIid\fR.
+.TP
+.B \fBedit-description\fR, \fBedit-desc\fR <\fIid\fR>
+Change the description of the recipe with the provided \fIid\fR.
+.TP
+.B \fBadd-ingr\fR <\fIid\fR> <\fIingredients\fR>
+Add the specified \fIingredients\fR to the recipe with \fIid\fR, where
+\fIingredients\fR is a comma-separated list (e.g. "garlic,tomato").
+.TP
+.B \fBrm-ingr\fR <\fIid\fR> <\fIingredients\fR>
+Remove the specified \fIingredients\fR from the recipe with \fIid\fR, where
+\fIingredients\fR is a comma-separated list (e.g. "garlic,tomato").
+.TP
+.B \fBadd-tag\fR <\fIid\fR> <\fItags\fR>
+Add the specified \fItags\fR to the recipe with \fIid\fR, where \fItags\fR is a
+comma-separated list (e.g. "dinner,simple").
+.TP
+.B \fBrm-tag\fR <\fIid\fR> <\fItags\fR>
+Remove the specified \fItags\fR from the recipe with \fIid\fR, where \fItags\fR
+is a comma-separated list (e.g. "dinner,simple").
+.TP
+.B \fBhelp\fR, \fB-h\fR, \fB--help\fR
+Show basic help information.
+.TP
+.B \fBversion\fR, \fB-v\fR, \fB--version\fR
+Show version information.
+
+.SH "AUTHOR"
+Written by Nicolás A. Ortega Froysa.
+
+.SH "COPYRIGHT"
+Copyright \(co 2024 Ortega Froysa, Nicolás A. <nicolas@ortegas.org>.
+License: GNU General Public License version 3 or greater (see <https://gnu.org/licenses/gpl.html>).
+
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.

src/arg_parse.hpp

@@ -25,16 +25,30 @@
 enum cmd_id {
 	CMD_UNKNOWN = 0,
 	CMD_ADD,
-	CMD_LIST,
 	CMD_DEL,
+	CMD_LIST,
+	CMD_INFO,
+	CMD_EDIT_NAME,
+	CMD_EDIT_DESC,
+	CMD_ADD_INGR,
+	CMD_RM_INGR,
+	CMD_ADD_TAG,
+	CMD_RM_TAG,
 	CMD_HELP,
 	CMD_VERSION,
 };
 
 static const std::map<enum cmd_id, std::vector<std::string>> commands = {
 	{ CMD_ADD, {"add", "new"} },
-	{ CMD_LIST, {"list", "ls"} },
 	{ CMD_DEL, {"del", "rm"} },
+	{ CMD_LIST, {"list", "ls"} },
+	{ CMD_INFO, {"info", "i"} },
+	{ CMD_EDIT_NAME, {"edit-name"} },
+	{ CMD_EDIT_DESC, {"edit-description", "edit-desc"} },
+	{ CMD_ADD_INGR, {"add-ingr"} },
+	{ CMD_RM_INGR, {"rm-ingr"} },
+	{ CMD_ADD_TAG, {"add-tag"} },
+	{ CMD_RM_TAG, {"rm-tag"} },
 	{ CMD_HELP, {"help", "-h", "--help"} },
 	{ CMD_VERSION, {"version", "-v", "--version"} },
 };
@@ -52,12 +66,20 @@ static inline void print_help(void) {
 	print_usage();
 
 	std::cout << "COMMANDS:\n"
-		   "\tadd, new                 Add a new recipe to the database.\n"
-		   "\tlist, ls                 List recipes with filters.\n"
-		   "\tdel, rm                  Delete recipe by ID.\n"
-		   "\thelp, -h, --help         Show this help information.\n"
-		   "\tversion, -v, --version   Show version information.\n"
+		   "\tadd, new                     Add a new recipe to the database.\n"
+		   "\tdel, rm                      Delete recipe by ID.\n"
+		   "\tlist, ls                     List recipes with filters.\n"
+		   "\tinfo                         Show recipe information.\n"
+		   "\tedit-name                    Change recipe name.\n"
+		   "\tedit-description, edit-desc  Change recipe description.\n"
+		   "\tadd-ingr                     Add ingredient to a recipe.\n"
+		   "\trm-ingr                      Remove ingredient from a recipe.\n"
+		   "\tadd-tag                      Add tag to a recipe.\n"
+		   "\trm-tag                       Remove tag from a recipe.\n"
+		   "\thelp, -h, --help             Show this help information.\n"
+		   "\tversion, -v, --version       Show version information.\n"
 		   << std::endl;
+	std::cout << "For more information about subcommands, use 'man menu-helper'." << std::endl;
 }
 
 enum cmd_id parse_args(const std::string &cmd);

src/cmd.cpp

@@ -19,13 +19,16 @@
 #include "db.hpp"
 #include "util.hpp"
 
-#include <iostream>
 #include <cstdlib>
+#include <sys/ioctl.h>
+#include <iomanip>
+#include <iostream>
 #include <string>
-#include <vector>
 #include <unistd.h>
+#include <vector>
 
-int command_add(void) {
+int cmd_add(void) {
+	db db;
 	std::string name, description, ingredients, tags;
 	int recipe_id, ingredient_id, tag_id;
 
@@ -41,40 +44,40 @@ int command_add(void) {
 	std::cout << "Tags (comma separated): ";
 	getline(std::cin, tags);
 
-	if(not db_open()) {
-		std::cerr << "Failed to open database. Cannot add new entry." << std::endl;
-		return EXIT_FAILURE;
-	}
+	db.open();
 
-	if((recipe_id = db_get_recipe_id(name)) <= 0)
-		recipe_id = db_add_recipe(name, description);
+	if((recipe_id = db.get_recipe_id(name)) <= 0)
+		recipe_id = db.add_recipe(name, description);
 
 	for(auto &ingredient : split(ingredients, ",")) {
 		trim(ingredient);
 
-		if((ingredient_id = db_get_ingredient_id(ingredient)) <= 0)
-			ingredient_id = db_add_ingredient(ingredient);
-		db_conn_recipe_ingredient(recipe_id, ingredient_id);
+		if((ingredient_id = db.get_ingredient_id(ingredient)) <= 0)
+			ingredient_id = db.add_ingredient(ingredient);
+		db.conn_recipe_ingredient(recipe_id, ingredient_id);
 	}
 
 	for(auto &tag : split(tags, ",")) {
 		trim(tag);
 
-		if((tag_id = db_get_tag_id(tag)) <= 0)
-			tag_id = db_add_tag(tag);
-		db_conn_recipe_tag(recipe_id, tag_id);
+		if((tag_id = db.get_tag_id(tag)) <= 0)
+			tag_id = db.add_tag(tag);
+		db.conn_recipe_tag(recipe_id, tag_id);
 	}
 
-	db_close();
+	db.close();
 
 	return EXIT_SUCCESS;
 }
 
-int command_list(int argc, char *argv[]) {
+int cmd_list(int argc, char *argv[]) {
+	db db;
 	std::vector<std::string> ingredients, tags;
+	struct winsize winsize;
+	const int id_col_sz = 5, name_col_sz = 24;
 	int opt;
 
-	while((opt = getopt(argc, argv, "i:t:")) != -1) {
+	while((opt = getopt(argc, argv, "i:t:")) not_eq -1) {
 		switch(opt) {
 		case 'i':
 			ingredients = split(optarg, ",");
@@ -93,21 +96,28 @@ int command_list(int argc, char *argv[]) {
 		}
 	}
 
-	if(not db_open()) {
-		std::cerr << "Failed to open database. Cannot add new entry." << std::endl;
-		return EXIT_FAILURE;
+	ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize);
+	const int desc_col_sz = winsize.ws_col - (id_col_sz + name_col_sz + 1);
+
+	db.open();
+
+	std::cout << std::left << std::setw(id_col_sz) << "ID"
+		<< std::setw(name_col_sz) << "NAME"
+		<< std::setw(desc_col_sz) << "DESCRIPTION" << std::endl;
+
+	for(const auto &recipe : db.get_recipes(ingredients, tags)) {
+		std::cout << std::left << std::setw(id_col_sz) << recipe.id
+			<< std::setw(name_col_sz) << recipe.name
+			<< std::setw(desc_col_sz) << recipe.description << std::endl;
 	}
 
-	for(const auto &recipe : db_get_recipes(ingredients, tags))
-		std::cout << recipe.id << "  |  " << recipe.name << "  |  " << recipe.description << std::endl;
-
-	db_close();
+	db.close();
 
 	return EXIT_SUCCESS;
 }
 
-int command_delete(int argc, char *argv[]) {
-	int ret = EXIT_SUCCESS;
+int cmd_delete(int argc, char *argv[]) {
+	db db;
 	std::vector<int> recipe_ids;
 
 	if(argc < 1) {
@@ -115,25 +125,215 @@ int command_delete(int argc, char *argv[]) {
 		return EXIT_FAILURE;
 	}
 
-	if(not db_open()) {
-		std::cerr << "Failed to open database. Cannot add new entry." << std::endl;
-		return EXIT_FAILURE;
-	}
+	db.open();
 
 	for(int i = 0; i < argc; ++i) {
 		const int id = std::stoi(argv[i]);
 
-		if(not db_recipe_exists(id)) {
+		if(not db.recipe_exists(id)) {
 			std::cerr << "No recipe exists with ID " << id << "." << std::endl;
+			db.close();
 			return EXIT_FAILURE;
 		} else {
 			recipe_ids.push_back(id);
 		}
 	}
 
-	ret = (db_del_recipes(recipe_ids)) ? EXIT_SUCCESS : EXIT_FAILURE;
+	db.del_recipes(recipe_ids);
+	db.close();
 
-	db_close();
-
-	return ret;
+	return EXIT_SUCCESS;
+}
+
+int cmd_info(const int id) {
+	db db;
+	struct recipe recipe;
+	std::vector<std::string> ingredients, tags;
+
+	db.open();
+
+	if(not db.recipe_exists(id)) {
+		std::cerr << "No recipe with ID '" << id << "'";
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	recipe = db.get_recipe(id);
+	ingredients = db.get_recipe_ingredients(id);
+	tags = db.get_recipe_tags(id);
+
+	db.close();
+
+	std::cout << "Name: " << recipe.name << "\n"
+		<< "Description: " << recipe.description << "\n"
+		<< "ID: " << recipe.id << "\n"
+		<< std::endl;
+
+	std::cout << "Ingredients:" << std::endl;
+	for(auto &ingredient : ingredients)
+		std::cout << "\t- " << ingredient << std::endl;
+	std::cout << std::endl;
+
+	std::cout << "Tags:" << std::endl;
+	for(auto &tag : tags)
+		std::cout << "\t- " << tag << std::endl;
+	std::cout << std::endl;
+
+	return EXIT_SUCCESS;
+}
+
+int cmd_edit_name(const int id) {
+	db db;
+	std::string new_name;
+
+	db.open();
+	if(not db.recipe_exists(id)) {
+		std::cerr << "Recipe with ID " << id << " does not exist." << std::endl;
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	std::cout << "New name: ";
+	std::getline(std::cin, new_name);
+
+	db.update_recipe_name(id, new_name);
+
+	db.close();
+
+	return EXIT_SUCCESS;
+}
+
+int cmd_edit_desc(const int id) {
+	db db;
+	std::string new_desc;
+
+	db.open();
+	if(not db.recipe_exists(id)) {
+		std::cerr << "Recipe with ID " << id << " does not exist." << std::endl;
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	std::cout << "New name: ";
+	std::getline(std::cin, new_desc);
+
+	db.update_recipe_desc(id, new_desc);
+
+	db.close();
+
+	return EXIT_SUCCESS;
+}
+
+int cmd_add_ingr(const int recipe_id, const char *ingredients) {
+	db db;
+	std::vector<std::string> ingr_list = split(ingredients, ",");
+
+	db.open();
+	if(not db.recipe_exists(recipe_id)) {
+		std::cerr << "Recipe with ID " << recipe_id << " does not exist." << std::endl;
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	for(auto &i : ingr_list) {
+		int ingr_id;
+		trim(i);
+
+		if(not db.ingredient_exists(i))
+			ingr_id = db.add_ingredient(i);
+		else
+			ingr_id = db.get_ingredient_id(i);
+
+		db.conn_recipe_ingredient(recipe_id, ingr_id);
+	}
+
+	db.close();
+
+	return EXIT_SUCCESS;
+}
+
+int cmd_rm_ingr(const int recipe_id, const char *ingredients) {
+	db db;
+	std::vector<std::string> ingr_list = split(ingredients, ",");
+
+	db.open();
+	if(not db.recipe_exists(recipe_id)) {
+		std::cerr << "Recipe with ID " << recipe_id << " does not exist." << std::endl;
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	for(auto &i : ingr_list) {
+		int ingr_id;
+		trim(i);
+
+		if(not db.ingredient_exists(i)) {
+			std::cerr << "Could not find ingredient '" << i << "'. Skipping!" << std::endl;
+			continue;
+		}
+
+		ingr_id = db.get_ingredient_id(i);
+		db.disconn_recipe_ingredient(recipe_id, ingr_id);
+	}
+
+	db.close();
+
+	return EXIT_SUCCESS;
+}
+
+int cmd_add_tag(const int recipe_id, const char *tags) {
+	db db;
+	std::vector<std::string> tag_list = split(tags, ",");
+
+	db.open();
+	if(not db.recipe_exists(recipe_id)) {
+		std::cerr << "Recipe with ID " << recipe_id << " does not exist." << std::endl;
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	for(auto &i : tag_list) {
+		int tag_id;
+		trim(i);
+
+		if(not db.tag_exists(i))
+			tag_id = db.add_tag(i);
+		else
+			tag_id = db.get_ingredient_id(i);
+
+		db.conn_recipe_tag(recipe_id, tag_id);
+	}
+
+	db.close();
+
+	return EXIT_SUCCESS;
+}
+
+int cmd_rm_tag(const int recipe_id, const char *tags) {
+	db db;
+	std::vector<std::string> tag_list = split(tags, ",");
+
+	db.open();
+	if(not db.recipe_exists(recipe_id)) {
+		std::cerr << "Recipe with ID " << recipe_id << " does not exist." << std::endl;
+		db.close();
+		return EXIT_FAILURE;
+	}
+
+	for(auto &i : tag_list) {
+		int tag_id;
+		trim(i);
+
+		if(not db.tag_exists(i)) {
+			std::cerr << "Could not find tag '" << i << "'. Skipping!" << std::endl;
+			continue;
+		}
+
+		tag_id = db.get_tag_id(i);
+		db.disconn_recipe_tag(recipe_id, tag_id);
+	}
+
+	db.close();
+
+	return EXIT_SUCCESS;
 }

src/cmd.hpp

@@ -17,6 +17,13 @@
  */
 #pragma once
 
-int command_add(void);
-int command_list(int argc, char *argv[]);
-int command_delete(int argc, char *argv[]);
+int cmd_add(void);
+int cmd_list(int argc, char *argv[]);
+int cmd_delete(int argc, char *argv[]);
+int cmd_info(const int id);
+int cmd_edit_name(const int id);
+int cmd_edit_desc(const int id);
+int cmd_add_ingr(const int recipe_id, const char *ingredients);
+int cmd_rm_ingr(const int recipe_id, const char *ingredients);
+int cmd_add_tag(const int recipe_id, const char *tags);
+int cmd_rm_tag(const int recipe_id, const char *tags);

src/db.cpp

@@ -17,28 +17,22 @@
  */
 #include "db.hpp"
 
-#include <sqlite3.h>
 #include <cstdlib>
-#include <iostream>
 #include <filesystem>
 #include <format>
-#include <string>
-#include <vector>
+#include <iostream>
+#include <sqlite3.h>
+#include <stdexcept>
 
 #define DB_VERSION 1
-static sqlite3 *db = nullptr;
 
-int db_open(void) {
+void db::open(void) {
 	std::string xdg_data_home;
 	std::string db_path;
 	bool new_db = false;
-	int rc;
 
-	if((xdg_data_home = std::getenv("XDG_DATA_HOME")).empty()) {
-		std::cerr << "Cannot find environment variable XDG_DATA_HOME. Please define it before continuing. E.g.:\n"
-			"export XDG_DATA_HOME=\"$HOME/.local/share\"" << std::endl;
-		return 0;
-	}
+	if((xdg_data_home = std::getenv("XDG_DATA_HOME")).empty())
+		throw std::runtime_error("Cannot find environment variable XDG_DATA_HOME. Please define it before continuing.");
 
 	db_path = xdg_data_home + "/menu-helper";
 
@@ -47,33 +41,31 @@ int db_open(void) {
 
 	db_path += "/recipes.db";
 
-	//if(access(db_path, F_OK) != 0) {
 	if(not std::filesystem::exists(db_path)) {
-		std::cout << "Creating database: " << db_path << std::endl;
+		std::cout << "Creating database in " << db_path << std::endl;
 		new_db = true;
 	}
 
-	rc = sqlite3_open(db_path.c_str(), &db);
+	if(sqlite3_open(db_path.c_str(), &sqlite_db) not_eq SQLITE_OK)
+		throw std::runtime_error("Failed to open database file " + db_path);
 
-	if(rc == SQLITE_OK && new_db) {
-		sqlite3_exec(db, "CREATE TABLE db_version(version INTEGER UNIQUE NOT nullptr);", nullptr, nullptr, nullptr);
-		//snprintf(insert_version_stmt, 64, "INSERT INTO db_version VALUES(%d);", DB_VERSION);
-		sqlite3_exec(db, std::format("INSERT INTO db_version VALUES({});", DB_VERSION).c_str(), nullptr, nullptr, nullptr);
-		sqlite3_exec(db, "CREATE TABLE tags(id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING UNIQUE);", nullptr, nullptr, nullptr);
-		sqlite3_exec(db, "CREATE TABLE ingredients(id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING UNIQUE);", nullptr, nullptr, nullptr);
-		sqlite3_exec(db, "CREATE TABLE recipes(id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING UNIQUE, description STRING);", nullptr, nullptr, nullptr);
-		sqlite3_exec(db, "CREATE TABLE recipe_tag(recipe_id INTEGER REFERENCES recipes(id) ON DELETE CASCADE, tag_id INTEGER REFERENCES tags(id) ON DELETE CASCADE);", nullptr, nullptr, nullptr);
-		sqlite3_exec(db, "CREATE TABLE recipe_ingredient(recipe_id INTEGER REFERENCES recipes(id) ON DELETE CASCADE, ingredient_id INTEGER REFERENCES ingredients(id) ON DELETE CASCADE);", nullptr, nullptr, nullptr);
+	if(new_db) {
+		sqlite3_exec(sqlite_db, "CREATE TABLE db_version(version INTEGER UNIQUE NOT NULL);", nullptr, nullptr, nullptr);
+		sqlite3_exec(sqlite_db, std::format("INSERT INTO db_version VALUES({});", DB_VERSION).c_str(), nullptr, nullptr, nullptr);
+		sqlite3_exec(sqlite_db, "CREATE TABLE tags(id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING UNIQUE);", nullptr, nullptr, nullptr);
+		sqlite3_exec(sqlite_db, "CREATE TABLE ingredients(id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING UNIQUE);", nullptr, nullptr, nullptr);
+		sqlite3_exec(sqlite_db, "CREATE TABLE recipes(id INTEGER PRIMARY KEY AUTOINCREMENT, name STRING UNIQUE, description STRING);", nullptr, nullptr, nullptr);
+		sqlite3_exec(sqlite_db, "CREATE TABLE recipe_tag(recipe_id INTEGER REFERENCES recipes(id) ON DELETE CASCADE, tag_id INTEGER REFERENCES tags(id) ON DELETE CASCADE, UNIQUE(recipe_id, tag_id));", nullptr, nullptr, nullptr);
+		sqlite3_exec(sqlite_db, "CREATE TABLE recipe_ingredient(recipe_id INTEGER REFERENCES recipes(id) ON DELETE CASCADE, ingredient_id INTEGER REFERENCES ingredients(id) ON DELETE CASCADE, UNIQUE(recipe_id, ingredient_id));", nullptr, nullptr, nullptr);
 	}
-
-	return rc == SQLITE_OK;
 }
 
-void db_close(void) {
-	if(not db)
+void db::close(void) {
+	if(not sqlite_db)
 		return;
 
-	sqlite3_close(db);
+	sqlite3_close(sqlite_db);
+	sqlite_db = nullptr;
 }
 
 int query_id_cb(void *recipe_id_var, int col_num, char **col_data, char **col_name) {
@@ -91,43 +83,47 @@ int query_id_cb(void *recipe_id_var, int col_num, char **col_data, char **col_na
 	return ret;
 }
 
-int table_get_id_by_name(const std::string &table, const std::string &name) {
+int db::table_get_id_by_name(const std::string &table, const std::string &name) {
 	int id = 0;
 
-	if(sqlite3_exec(db, std::format("SELECT id FROM {} WHERE lower(name)=lower('{}');", table, name).c_str(),
-					query_id_cb, &id, nullptr) != SQLITE_OK)
-		return -2;
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("SELECT id FROM {} WHERE lower(name)=lower('{}');", table, name).c_str(),
+					query_id_cb, &id, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to get ID of '{}' from table '{}'.", name, table));
+	}
 
 	return id;
 }
 
-int db_add_recipe(const std::string &name, const std::string &description) {
-	if(not db)
-		return -1;
+int db::add_recipe(const std::string &name, const std::string &description) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	if(sqlite3_exec(db, std::format("INSERT INTO recipes(name,description) VALUES('{}','{}');", name, description).c_str(),
-					nullptr, nullptr, nullptr) != SQLITE_OK)
-		return -2;
+	if(sqlite3_exec(sqlite_db, std::format("INSERT OR IGNORE INTO recipes(name,description) VALUES('{}','{}');", name, description).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error("Failed to insert new recipe into database.");
+	}
 
-	return db_get_recipe_id(name);
+	return get_recipe_id(name);
 }
 
-bool db_del_recipe(const int id) {
-	if(not db)
-		return false;
+void db::del_recipe(const int id) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	if(sqlite3_exec(db, std::format("DELETE FROM recipes WHERE id={}", id).c_str(),
-					nullptr, nullptr, nullptr) not_eq SQLITE_OK)
-		return false;
-
-	return true;
+	if(sqlite3_exec(sqlite_db, std::format("DELETE FROM recipes WHERE id={}", id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to delete recipe with ID {} from database.", id));
+	}
 }
 
-bool db_del_recipes(const std::vector<int> &ids) {
+void db::del_recipes(const std::vector<int> &ids) {
 	std::string stmt = "DELETE FROM recipes WHERE id IN (";
 
-	if(not db)
-		return false;
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
 	bool first = true;
 	for(auto id : ids) {
@@ -141,41 +137,74 @@ bool db_del_recipes(const std::vector<int> &ids) {
 
 	stmt += ");";
 
-	if(sqlite3_exec(db, stmt.c_str(), nullptr, nullptr, nullptr) not_eq SQLITE_OK)
-		return false;
-
-	return true;
+	if(sqlite3_exec(sqlite_db, stmt.c_str(), nullptr, nullptr, nullptr) not_eq SQLITE_OK)
+		throw std::runtime_error("Failed to delete recipes from database.");
 }
 
-bool db_recipe_exists(const int id) {
+bool db::recipe_exists(const int id) {
 	bool exists = false;
 
-	if(not db)
-		return false;
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	sqlite3_exec(db, std::format("SELECT id FROM recipes WHERE id={}", id).c_str(),
-				 [](void *found,int,char**,char**) {
-				 *static_cast<bool*>(found) = true;
-				 return 0;
-				 }, &exists, nullptr);
+	if(sqlite3_exec(sqlite_db, std::format("SELECT id FROM recipes WHERE id={}", id).c_str(),
+					[](void *found,int,char**,char**) {
+					*static_cast<bool*>(found) = true;
+					return 0;
+					}, &exists, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error("Failed to select from database.");
+	}
 
 	return exists;
 }
 
-int db_get_recipe_id(const std::string &name) {
-	if(not db)
-		return -1;
+struct recipe db::get_recipe(const int id) {
+	struct recipe recipe;
 
-	return table_get_id_by_name("recipes", name);
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("SELECT * FROM recipes WHERE id={};", id).c_str(),
+					[](void *recipe, int, char **col_data, char**) {
+					*static_cast<struct recipe*>(recipe) = { std::atoi(col_data[0]), col_data[1], col_data[2] };
+					return 0;
+					}, &recipe, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error("Failed to select from database.");
+	}
+
+	return recipe;
 }
 
-std::vector<struct recipe> db_get_recipes(const std::vector<std::string> &ingredients,
-										  const std::vector<std::string> &tags)
+void db::update_recipe_name(const int id, const std::string &new_name) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("UPDATE OR IGNORE recipes SET name='{}' WHERE id={};", new_name, id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to modify name of recipe with ID {}.", id));
+	}
+}
+
+void db::update_recipe_desc(const int id, const std::string &new_desc) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("UPDATE OR IGNORE recipes SET description='{}' WHERE id={};", new_desc, id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to modify description of recipe with ID {}.", id));
+	}
+}
+
+std::vector<struct recipe> db::get_recipes(const std::vector<std::string> &ingredients,
+										   const std::vector<std::string> &tags)
 {
 	std::vector<struct recipe> recipes;
 	std::string stmt = "SELECT id,name,description FROM recipes";
 	std::string filters;
 
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
 	if(not ingredients.empty() or not tags.empty())
 		filters += " WHERE";
 
@@ -191,14 +220,10 @@ std::vector<struct recipe> db_get_recipes(const std::vector<std::string> &ingred
 
 			filters += " id IN (SELECT recipe_id FROM recipe_ingredient WHERE ingredient_id=";
 
-			// TODO: use throw?
-			if((id = db_get_ingredient_id(i)) < 0) {
-				std::cerr << "Failed to find ingredient '" << i << "'" << std::endl;
-				return std::vector<struct recipe>();
-			} else {
-				filters += std::to_string(id);
-			}
+			if((id = get_ingredient_id(i)) <= 0)
+				throw std::runtime_error(std::format("Failed to find ingredient '{}'", i));
 
+			filters += std::to_string(id);
 			filters += ")";
 		}
 	}
@@ -218,87 +243,126 @@ std::vector<struct recipe> db_get_recipes(const std::vector<std::string> &ingred
 
 			filters += " id IN (SELECT recipe_id FROM recipe_tag WHERE tag_id=";
 
-			// TODO: use throw?
-			if((id = db_get_tag_id(i)) < 0) {
-				std::cerr << "Failed to find tag '" << i << "'" << std::endl;
-				return std::vector<struct recipe>();
-			} else {
-				filters += std::to_string(id);
-			}
+			if((id = get_tag_id(i)) <= 0)
+				throw std::runtime_error("Failed to find tag '{}'");
 
+			filters += std::to_string(id);
 			filters += ")";
 		}
 	}
 
 	stmt += filters + ";";
 
-	sqlite3_exec(db, stmt.c_str(),
-				 [](void *recipe_list, int, char **col_data, char**) {
-				 	auto recipe_vec = static_cast<std::vector<struct recipe>*>(recipe_list);
-					recipe_vec->push_back({
-										  std::atoi(col_data[0]),
-										  col_data[1],
-										  col_data[2] });
+	if(sqlite3_exec(sqlite_db, stmt.c_str(),
+					[](void *recipe_list, int, char **col_data, char**) {
+					static_cast<std::vector<struct recipe>*>(recipe_list)->push_back({
+																					 std::atoi(col_data[0]),
+																					 col_data[1],
+																					 col_data[2] });
 					return 0;
-				 }, &recipes, nullptr);
+					}, &recipes, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error("Failed to select recipes.");
+	}
 
 	return recipes;
 }
 
-int db_add_ingredient(const std::string &name) {
-	if(not db)
-		return -1;
+int db::add_ingredient(const std::string &name) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	if(sqlite3_exec(db, std::format("INSERT INTO ingredients(name) VALUES(lower('{}'));", name).c_str(),
-					nullptr, nullptr, nullptr) != SQLITE_OK)
-		return -2;
+	if(sqlite3_exec(sqlite_db, std::format("INSERT OR IGNORE INTO ingredients(name) VALUES(lower('{}'));", name).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to instert ingredient '{}'.", name));
+	}
 
-	return db_get_ingredient_id(name);
+	return get_ingredient_id(name);
 }
 
-int db_get_ingredient_id(const std::string &name) {
-	if(not db)
-		return -1;
+std::vector<std::string> db::get_recipe_ingredients(const int id) {
+	std::vector<std::string> ingredients;
 
-	return table_get_id_by_name("ingredients", name);
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("SELECT name FROM ingredients WHERE id IN (SELECT ingredient_id FROM recipe_ingredient WHERE recipe_id={});", id).c_str(),
+					[](void *ingredients, int, char **col_data, char**) {
+					static_cast<std::vector<std::string>*>(ingredients)->push_back(col_data[0]);
+					return 0;
+					}, &ingredients, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to select ingredients from recipe with ID {}", id));
+	}
+
+	return ingredients;
 }
 
-int db_add_tag(const std::string &name) {
-	if(not db)
-		return -1;
+int db::add_tag(const std::string &name) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	if(sqlite3_exec(db, std::format("INSERT INTO tags(name) VALUES('{}');", name).c_str(),
-					nullptr, nullptr, nullptr) != SQLITE_OK)
-		return -2;
+	if(sqlite3_exec(sqlite_db, std::format("INSERT OR IGNORE INTO tags(name) VALUES('{}');", name).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to insert tag '{}'", name));
+	}
 
-	return db_get_tag_id(name);
+	return get_tag_id(name);
 }
 
-int db_get_tag_id(const std::string &name) {
-	if(not db)
-		return -1;
+std::vector<std::string> db::get_recipe_tags(const int id) {
+	std::vector<std::string> tags;
 
-	return table_get_id_by_name("tags", name);
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("SELECT name FROM tags WHERE id IN (SELECT tag_id FROM recipe_tag WHERE recipe_id={});", id).c_str(),
+					[](void *tags, int, char **col_data, char**) {
+					static_cast<std::vector<std::string>*>(tags)->push_back(col_data[0]);
+					return 0;
+					}, &tags, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to select tags for recipe with ID {}", id));
+	}
+
+	return tags;
 }
 
-int db_conn_recipe_ingredient(int recipe_id, int ingredient_id) {
-	if(not db)
-		return -1;
+void db::conn_recipe_ingredient(const int recipe_id, const int ingredient_id) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	if(sqlite3_exec(db, std::format("INSERT INTO recipe_ingredient(recipe_id, ingredient_id) VALUES({},{});", recipe_id, ingredient_id).c_str(),
-					nullptr, nullptr, nullptr) != SQLITE_OK)
-		return -2;
-
-	return 1;
+	if(sqlite3_exec(sqlite_db, std::format("INSERT OR IGNORE INTO recipe_ingredient(recipe_id, ingredient_id) VALUES({},{});", recipe_id, ingredient_id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to connect recipe with ID {} to ingredient with ID {}",
+												  recipe_id, ingredient_id));
+	}
 }
 
-int db_conn_recipe_tag(int recipe_id, int tag_id) {
-	if(not db)
-		return -1;
+void db::disconn_recipe_ingredient(const int recipe_id, const int ingredient_id) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
 
-	if(sqlite3_exec(db, std::format("INSERT INTO recipe_tag(recipe_id, tag_id) VALUES({},{});", recipe_id, tag_id).c_str(),
-					nullptr, nullptr, nullptr) != SQLITE_OK)
-		return -2;
-
-	return 1;
+	if(sqlite3_exec(sqlite_db, std::format("DELETE FROM recipe_ingredient WHERE recipe_id={} AND ingredient_id={};", recipe_id, ingredient_id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to disconnect recipe with ID {} from ingredient with ID {}.", recipe_id, ingredient_id));
+	}
+}
+
+void db::conn_recipe_tag(const int recipe_id, const int tag_id) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("INSERT OR IGNORE INTO recipe_tag(recipe_id, tag_id) VALUES({},{});", recipe_id, tag_id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to connect recipe with ID {} to tag with ID {}",
+												  recipe_id, tag_id));
+	}
+}
+
+void db::disconn_recipe_tag(const int recipe_id, const int tag_id) {
+	if(not sqlite_db)
+		throw std::runtime_error(std::format("{}: Database not open! Please contact a developer.", __PRETTY_FUNCTION__));
+
+	if(sqlite3_exec(sqlite_db, std::format("DELETE FROM recipe_tag WHERE recipe_id={} AND tag_id={};", recipe_id, tag_id).c_str(),
+					nullptr, nullptr, nullptr) not_eq SQLITE_OK) {
+		throw std::runtime_error(std::format("Failed to disconnect recipe with ID {} from tag with ID {}.", recipe_id, tag_id));
+	}
 }

src/db.hpp

@@ -17,6 +17,7 @@
  */
 #pragma once
 
+#include <sqlite3.h>
 #include <string>
 #include <vector>
 
@@ -26,53 +27,77 @@ struct recipe {
 	std::string description;
 };
 
-int db_open(void);
-void db_close(void);
+class db {
+private:
+	sqlite3 *sqlite_db;
+	int table_get_id_by_name(const std::string &table, const std::string &name);
 
-/**
- * @brief Add a new recipe to the database.
- *
- * @param name Name of the new recipe.
- * @param description Short description.
- *
- * @return ID of newly created recipe, -1 if DB isn't open, -2 on other failure.
- */
-int db_add_recipe(const std::string &name, const std::string &description);
-bool db_del_recipe(const int id);
-bool db_del_recipes(const std::vector<int> &ids);
-int db_get_recipe_id(const std::string &name);
-bool db_recipe_exists(const int id);
-static inline bool db_recipe_exists(const std::string &name) {
-	return (db_get_recipe_id(name) > 0);
-}
-std::vector<struct recipe> db_get_recipes(const std::vector<std::string> &ingredients,
-										  const std::vector<std::string> &tags);
+public:
+	db() : sqlite_db(nullptr) {}
+	~db() {
+		sqlite3_close(sqlite_db);
+	}
+	void open(void);
+	void close(void);
 
-/**
- * @brief Add a new ingredient to the database.
- *
- * @param name Name of the new ingredient.
- *
- * @return ID of newly created ingredient, -1 if DB isn't open, -2 on other failure.
- */
-int db_add_ingredient(const std::string &name);
-int db_get_ingredient_id(const std::string &name);
-static inline bool db_ingredient_exists(const std::string &name) {
-	return (db_get_ingredient_id(name) > 0);
-}
+	/**
+	 * @brief Add a new recipe to the database.
+	 *
+	 * @param name Name of the new recipe.
+	 * @param description Short description.
+	 *
+	 * @return ID of newly created recipe.
+	 */
+	int add_recipe(const std::string &name, const std::string &description);
+	void del_recipe(const int id);
+	void del_recipes(const std::vector<int> &ids);
+	inline int get_recipe_id(const std::string &name) {
+		return table_get_id_by_name("recipes", name);
+	}
+	inline bool recipe_exists(const std::string &name) {
+		return (get_recipe_id(name) > 0);
+	}
+	bool recipe_exists(const int id);
+	struct recipe get_recipe(const int id);
+	void update_recipe_name(const int id, const std::string &new_name);
+	void update_recipe_desc(const int id, const std::string &new_desc);
+	std::vector<struct recipe> get_recipes(const std::vector<std::string> &ingredients,
+										   const std::vector<std::string> &tags);
 
-/**
- * @brief Add a new tag to the database.
- *
- * @param name Name of the new tag.
- *
- * @return ID of newly created tag, -1 if DB isn't open, -2 on other failure.
- */
-int db_add_tag(const std::string &name);
-int db_get_tag_id(const std::string &name);
-static inline bool db_tag_exists(const std::string &name) {
-	return (db_get_tag_id(name) > 0);
-}
+	/**
+	 * @brief Add a new ingredient to the database.
+	 *
+	 * @param name Name of the new ingredient.
+	 *
+	 * @return ID of newly created ingredient.
+	 */
+	int add_ingredient(const std::string &name);
+	std::vector<std::string> get_recipe_ingredients(const int id);
+	inline int get_ingredient_id(const std::string &name) {
+		return table_get_id_by_name("ingredients", name);
+	}
+	inline bool ingredient_exists(const std::string &name) {
+		return (get_ingredient_id(name) > 0);
+	}
 
-int db_conn_recipe_ingredient(int recipe_id, int ingredient_id);
-int db_conn_recipe_tag(int recipe_id, int tag_id);
+	/**
+	 * @brief Add a new tag to the database.
+	 *
+	 * @param name Name of the new tag.
+	 *
+	 * @return ID of newly created tag, -1 if DB isn't open, -2 on other failure.
+	 */
+	int add_tag(const std::string &name);
+	std::vector<std::string> get_recipe_tags(const int id);
+	inline int get_tag_id(const std::string &name) {
+		return table_get_id_by_name("tags", name);
+	}
+	inline bool tag_exists(const std::string &name) {
+		return (get_tag_id(name) > 0);
+	}
+
+	void conn_recipe_ingredient(const int recipe_id, const int ingredient_id);
+	void disconn_recipe_ingredient(const int recipe_id, const int ingredient_id);
+	void conn_recipe_tag(const int recipe_id, const int tag_id);
+	void disconn_recipe_tag(const int recipe_id, const int tag_id);
+};

src/main.cpp

@@ -16,8 +16,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <iostream>
 #include <cstdlib>
+#include <exception>
+#include <iostream>
+#include <string>
 
 #include "arg_parse.hpp"
 #include "cmd.hpp"
@@ -34,26 +36,77 @@ int main(int argc, char *argv[]) {
 
 	id = parse_args(argv[1]);
 
-	switch(id) {
-	case CMD_ADD:
-		ret = command_add();
-		break;
-	case CMD_LIST:
-		ret = command_list(argc - 1, argv + 1);
-		break;
-	case CMD_DEL:
-		ret = command_delete(argc - 2, argv + 2);
-		break;
-	case CMD_HELP:
-		print_help();
-		break;
-	case CMD_VERSION:
-		print_version();
-		break;
-	default:
-		std::cerr << "No such command '" << argv[1] << "'. Use 'help' sub-command." << std::endl;
-		print_usage();
-		return EXIT_FAILURE;
+	try {
+		switch(id) {
+		case CMD_ADD:
+			if(argc not_eq 2)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_add();
+			break;
+		case CMD_DEL:
+			if(argc not_eq 3)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_delete(argc - 2, argv + 2);
+			break;
+		case CMD_LIST:
+			if(argc > 6)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_list(argc - 1, argv + 1);
+			break;
+		case CMD_INFO:
+			if(argc not_eq 3)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_info(std::stoi(argv[2]));
+			break;
+		case CMD_EDIT_NAME:
+			if(argc not_eq 3)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_edit_name(std::stoi(argv[2]));
+			break;
+		case CMD_EDIT_DESC:
+			if(argc not_eq 3)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_edit_desc(std::stoi(argv[2]));
+			break;
+		case CMD_ADD_INGR:
+			if(argc not_eq 4)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_add_ingr(std::stoi(argv[2]), argv[3]);
+			break;
+		case CMD_RM_INGR:
+			if(argc not_eq 4)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_rm_ingr(std::stoi(argv[2]), argv[3]);
+			break;
+		case CMD_ADD_TAG:
+			if(argc not_eq 4)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_add_tag(std::stoi(argv[2]), argv[3]);
+			break;
+		case CMD_RM_TAG:
+			if(argc not_eq 4)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			ret = cmd_rm_tag(std::stoi(argv[2]), argv[3]);
+			break;
+		case CMD_HELP:
+			if(argc not_eq 2)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			print_help();
+			break;
+		case CMD_VERSION:
+			if(argc not_eq 2)
+				throw "Invalid number of arguments. Use 'help' subcommand for more information.";
+			print_version();
+			break;
+		default:
+			std::cerr << "No such command '" << argv[1] << "'. Use 'help' sub-command." << std::endl;
+			print_usage();
+			ret = EXIT_FAILURE;
+			break;
+		}
+	} catch(const std::exception &e) {
+		std::cerr << e.what() << std::endl;
+		ret = EXIT_FAILURE;
 	}
 
 	return ret;