add -O3 to cflags

.gitignore

@@ -1 +1,3 @@
 todd
+*.o
+*.todd

3rd-party/NCURSES-LICENSE.txt

@@ -0,0 +1,27 @@
+-------------------------------------------------------------------------------
+-- Copyright (c) 1998-2004,2006 Free Software Foundation, Inc.               --
+--                                                                           --
+-- Permission is hereby granted, free of charge, to any person obtaining a   --
+-- copy of this software and associated documentation files (the             --
+-- "Software"), to deal in the Software without restriction, including       --
+-- without limitation the rights to use, copy, modify, merge, publish,       --
+-- distribute, distribute with modifications, sublicense, and/or sell copies --
+-- of the Software, and to permit persons to whom the Software is furnished  --
+-- to do so, subject to the following conditions:                            --
+--                                                                           --
+-- The above copyright notice and this permission notice shall be included   --
+-- in all copies or substantial portions of the Software.                    --
+--                                                                           --
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS   --
+-- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF                --
+-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN --
+-- NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,       --
+-- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR     --
+-- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE --
+-- USE OR OTHER DEALINGS IN THE SOFTWARE.                                    --
+--                                                                           --
+-- Except as contained in this notice, the name(s) of the above copyright    --
+-- holders shall not be used in advertising or otherwise to promote the      --
+-- sale, use or other dealings in this Software without prior written        --
+-- authorization.                                                            --
+-------------------------------------------------------------------------------

3rd-party/STB-DS-LICENSE.txt

@@ -0,0 +1,16 @@
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

LICENSE.txt

@@ -0,0 +1,22 @@
+
+The MIT License (MIT)
+
+Copyright (c) 2024 Zvonimir Rudinski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -0,0 +1,23 @@
+.DEFAULT_GOAL := all
+
+CC=gcc
+CFLAGS=-Wall -Wextra -Werror -pedantic -std=c99 -O3
+
+todo.o:
+	$(CC) $(CFLAGS) -c engine/todo.c -o todo.o
+
+main.o:
+	$(CC) $(CFLAGS) -c main.c -o main.o
+
+clean:
+	rm -f *.o
+	rm -f todd
+	rm /usr/local/bin/todd || true
+
+todd: todo.o main.o
+	$(CC) $(CFLAGS) todo.o main.o -lncurses -o todd
+
+all: todd
+
+install: todd
+	cp todd /usr/local/bin/todd

README.md

@@ -0,0 +1,16 @@
+# Todd
+`todd` is a to-do app written in C.
+## Requirements
+- GCC
+- GNU Make
+- ncurses development libraries
+## Building
+To build `todd` all you need to do is run `make`.
+## Usage
+```sh
+./todd <file.todd>
+```
+## 3rd Party
+Todd uses the following dependencies:
+- stb_ds - https://github.com/nothings/stb
+- ncurses - https://tldp.org/HOWTO/NCURSES-Programming-HOWTO/index.html

build.sh

@@ -1 +0,0 @@
-cc main.c -o todd

color.h

@@ -0,0 +1,15 @@
+#ifndef COLOR_H
+#define COLOR_H
+
+#include <ncurses.h>
+
+#define BORDERS_PRIMARY COLOR_BLACK
+#define BORDERS_SECONDARY COLOR_WHITE
+
+#define DEFAULT_PRIMARY COLOR_WHITE
+#define DEFAULT_SECONDARY COLOR_BLACK
+
+#define COMPLETED_PRIMARY COLOR_BLACK
+#define COMPLETED_SECONDARY COLOR_YELLOW
+
+#endif

engine/todo.c

@@ -0,0 +1,56 @@
+#include "todo.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// Memory management
+void todo_free_item(TodoItem *item) { free(item->title); }
+
+// Item operations
+TodoItem todo_create_item(char *title) {
+  TodoItem item;
+  item.title_length = strlen(title);
+  item.title = malloc(item.title_length + 1);
+  strcpy(item.title, title);
+  item.completed = false;
+
+  return item;
+}
+
+void todo_mark_item(TodoItem *item, bool_t completed) {
+  item->completed = completed;
+}
+
+void todo_print_item(TodoItem *item) {
+  printf("%s - ", item->title);
+  if (item->completed) {
+    printf("Completed\n");
+  } else {
+    printf("Not Completed\n");
+  }
+}
+
+// Serialization
+char *todo_item_serialize(TodoItem *item, int *buffer_size_out) {
+  // Layout of the serialized item:
+  // title_length - 1 byte
+  // title - title_length bytes
+  // completed - 1 byte
+  unsigned char title_length = item->title_length;
+  unsigned char completed_length = sizeof(item->completed);
+  int buffer_size = sizeof(unsigned char) + title_length + completed_length;
+
+  char *buffer = malloc(buffer_size);
+
+  // copy title length
+  memcpy(buffer, &title_length, sizeof(unsigned char));
+  // copy title
+  memcpy(buffer + sizeof(unsigned char), item->title, title_length);
+  // copy completed
+  memcpy(buffer + sizeof(unsigned char) + title_length, &item->completed,
+         completed_length);
+
+  *buffer_size_out = buffer_size;
+
+  return buffer;
+}

engine/todo.h

@@ -0,0 +1,25 @@
+#ifndef TODO_H
+#define TODO_H
+#define TODO_MAX_TITLE_LENGTH 255
+
+#define true 1
+#define false 0
+typedef unsigned char bool_t;
+
+typedef struct {
+  unsigned char title_length;
+  char *title;
+  bool_t completed;
+} TodoItem;
+
+// Memory management
+void todo_free_item(TodoItem *item);
+
+// Item operations
+TodoItem todo_create_item(char *title);
+void todo_mark_item(TodoItem *item, bool_t completed);
+void todo_print_item(TodoItem *item);
+
+// Serialization
+char *todo_item_serialize(TodoItem *item, int *buffer_size_out);
+#endif

main.c

@@ -1,7 +1,438 @@
+#include "engine/todo.h"
+#include "color.h"
+#include <limits.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <pwd.h>
 
-int main(int argc, char **argv) { 
-  printf("Hello, world!\n");
+#define MAX_TODOS UINT_MAX
+#define MAX_PATH_LENGTH 1024
+#define STB_DS_IMPLEMENTATION
 
-  return 0; 
+#define BORDERS_PAIR 1
+#define DEFAULT_PAIR 2
+#define COMPLETED_PAIR 3
+
+#include "3rd-party/stb-ds.h"
+#define KEY_BINDINGS " [a]dd [v]view [m]ark [d]elete [w]rite [l]oad [q]uit"
+
+bool dirty = false;
+char SAVE_FILE[MAX_PATH_LENGTH] = "";
+TodoItem *todos = NULL;
+
+enum Command {
+  ADD = 'a',
+  VIEW = 'v',
+  MARK = 'm',
+  REMOVE = 'd',
+  QUIT = 'q',
+
+  WRITE_TO_FILE = 'w',
+  LOAD_FROM_FILE = 'l',
+
+  UP = 'k',
+  DOWN = 'j',
+
+  UP_ARROW = KEY_UP,
+  DOWN_ARROW = KEY_DOWN,
+  SPACE = ' '
+};
+
+void clear_todos(void) {
+  for (int i = 0; i < arrlen(todos); i++) {
+    todo_free_item(&todos[i]);
+  }
+
+  arrfree(todos);
+}
+
+void initialize_curses(int *width, int *height) {
+  initscr();
+  curs_set(0);
+  int tw, th;
+  getmaxyx(stdscr, th, tw);
+
+  *width = tw;
+  *height = th;
+
+  start_color();
+  init_pair(BORDERS_PAIR, BORDERS_PRIMARY, BORDERS_SECONDARY);
+  init_pair(DEFAULT_PAIR, DEFAULT_PRIMARY, DEFAULT_SECONDARY);
+  init_pair(COMPLETED_PAIR, COMPLETED_PRIMARY, COMPLETED_SECONDARY);
+  // turn off echoing of keys, and enter cbreak mode,
+  // where no buffering is performed on keyboard input
+  cbreak();
+  noecho();
+  keypad(stdscr, TRUE);
+}
+
+void draw_header(int width) {
+  attron(COLOR_PAIR(BORDERS_PAIR));
+  move(0, 0);
+  addstr(" Todd - ");
+  addstr(SAVE_FILE);
+  for (int i = strlen(" Todd - ") + strlen(SAVE_FILE); i < width - 1; i++) {
+    addch(' ');
+  }
+}
+
+void draw_footer(int width, int height) {
+  move(height - 1, 0);
+  addch(' ');
+  int todos_count = arrlen(todos);
+  int marked_count = 0;
+
+  for (int i = 0; i < todos_count; i++) {
+    if (todos[i].completed) {
+      marked_count++;
+    }
+  }
+
+  // get the length of the string
+  int length = snprintf(NULL, 0, "%d/%d", marked_count, todos_count);
+  // print the string
+  printw("%d/%d", marked_count, todos_count);
+
+  // print the rest of the line but leave space for the key bindings
+  for (unsigned long i = length; i < width - strlen(KEY_BINDINGS) - 1; i++) {
+    addch(' ');
+  }
+
+  // print the key bindings
+  printw(KEY_BINDINGS);
+
+  attroff(COLOR_PAIR(BORDERS_PAIR));
+}
+
+char alert(const char *message, int terminal_width, int terminal_height) {
+  int window_height = 5;
+  int window_width = terminal_width - 4;
+  int window_y = terminal_height / 2 - 1;
+  int window_x = 2;
+
+  int message_x = (terminal_width - 4 - strlen(message)) / 2;
+  int message_y = 2;
+
+  // create a new window
+  WINDOW *alert_window = newwin(window_height, window_width, window_y, window_x);
+  // draw a border around the window
+  box(alert_window, 0, 0);
+  // print the message in the middle of the window
+  mvwprintw(alert_window, message_y, message_x, "%s", message);
+  // refresh the window
+  wrefresh(alert_window);
+  // wait for a key press
+  char key = getch();
+
+  // delete the window
+  delwin(alert_window);
+
+  return key;
+}
+
+void input_string(int terminal_width, int terminal_height, char *buffer, int buffer_size) {
+  int window_height = 5;
+  int window_width = terminal_width - 4;
+  int window_y = terminal_height / 2 - 1;
+  int window_x = 2;
+
+  int message_x = strlen("Enter todo title: ") + 1;
+  int message_y = 2;
+
+  curs_set(1);
+  // create a new window
+  WINDOW *input_window = newwin(window_height, window_width, window_y, window_x);
+  // draw a border around the window
+  box(input_window, 0, 0);
+  // print the message in the middle of the window
+  mvwprintw(input_window, message_y, message_x, "Enter todo title: ");
+  // refresh the window
+  wrefresh(input_window);
+  // wait for a key press
+  echo();
+  mvwgetnstr(input_window, message_y, message_x + strlen("Enter todo title: "), buffer, buffer_size);
+  noecho();
+
+  // delete the window
+  delwin(input_window);
+  curs_set(0);
+}
+
+void display_todos(int width, int height, int current_line) {
+  int current_y = 1;
+  int current_index = 0;
+  const char *padding = "...";
+  unsigned long title_length = 0;
+  unsigned long padding_length = strlen(padding);
+  
+  char *title = (char *)malloc(width);
+
+  attron(COLOR_PAIR(DEFAULT_PAIR));
+
+  // calculate the offset
+  if (height - 4 <= current_line) {
+    // ignore the first n todos
+    current_index = current_line - (height - 4);
+  }
+  
+  // while we have space to print todos
+  while (current_y < height - 2) {
+    // check if we're out of bounds
+    if (current_index >= arrlen(todos)) {
+      break;
+    }
+
+    // copy the title to the buffer
+    title_length = strlen(todos[current_index].title);
+    strncpy(title, todos[current_index].title, width - padding_length - 1);
+    // append the padding if needed
+    if (title_length > strlen(title)) {
+      strcat(title, padding);
+    }
+
+    // move to the correct line
+    move(current_y, 0);
+
+    // if the current todo is completed, print it as green
+    if (todos[current_index].completed) {
+      attroff(COLOR_PAIR(DEFAULT_PAIR));
+      attron(COLOR_PAIR(COMPLETED_PAIR));
+    }
+
+    // highlight the current line
+    if (current_index == current_line) {
+      attron(A_UNDERLINE);
+    }
+
+    printw("%d. %s", current_index + 1, title);
+
+    // increment the current y and index
+    current_y++;
+    current_index++;
+
+    attroff(A_UNDERLINE);
+    attroff(COLOR_PAIR(COMPLETED_PAIR));
+    attron(COLOR_PAIR(DEFAULT_PAIR));
+  }
+
+  free(title);
+}
+
+// Command handlers
+void add_command_handler(int width, int height) {
+  char title[TODO_MAX_TITLE_LENGTH];
+
+  input_string(width, height, title, TODO_MAX_TITLE_LENGTH);
+
+  TodoItem item = todo_create_item(title);
+  arrput(todos, item);
+
+  // set the dirty flag
+  dirty = true;
+}
+
+void view_command_handler(int width, int height, int index) {
+  // check if the index is out of bounds
+  if (index < 0 || index >= arrlen(todos)) {
+    return;
+  }
+
+  TodoItem item = todos[index];
+  // create an alert in the middle of the screen
+  alert(item.title, width, height);
+}
+
+void mark_command_handler(int index) {
+  // check if the index is out of bounds
+  if (index < 0 || index >= arrlen(todos)) {
+    return;
+  }
+
+  TodoItem item = todos[index];
+
+  todo_mark_item(&item, !item.completed);
+
+  todos[index] = item;
+
+  // set the dirty flag
+  dirty = true;
+}
+
+void remove_command_handler(int index) {
+  // check if the index is out of bounds
+  if (index < 0 || index >= arrlen(todos)) {
+    return;
+  }
+
+  arrdel(todos, index);
+
+  // set the dirty flag
+  dirty = true;
+}
+
+void write_to_file_handler(void) {
+  FILE *file = fopen(SAVE_FILE, "wb");
+  int bs = 0;
+  int todos_count = arrlen(todos);
+  // write a magic value "TODD" to the file
+  fwrite("TODD", sizeof(char), 4, file);
+  // write the number of todos to the file
+  fwrite(&todos_count, sizeof(int), 1, file);
+  // write each todo to the file
+  for (int i = 0; i < todos_count; i++) {
+    char *buffer = todo_item_serialize(&todos[i], &bs);
+    fwrite(buffer, sizeof(char), bs, file);
+    free(buffer);
+  }
+  fclose(file);
+  // reset the dirty flag
+  dirty = false;
+}
+
+void load_from_file_handler(void) {
+  // clear the current todos
+  clear_todos();
+
+  FILE *file = fopen(SAVE_FILE, "rb");
+
+  // if unable to open the file, return
+  if (file == NULL) {
+    return;
+  }
+
+  char magic[5] = {'\0'};
+  int todos_count = 0;
+  // check the "TODD" (without the \0) magic value
+  fread(magic, sizeof(char), 4, file);
+  if (strcmp(magic, "TODD") != 0) {
+    printf("Invalid file format\nExpected TODD, got %s\n", magic);
+    return;
+  }
+
+  // read the number of todos
+  fread(&todos_count, sizeof(int), 1, file);
+
+  // read each todo
+  for (int i = 0; i < todos_count; i++) {
+    // read the title length
+    unsigned char title_length = 0;
+    fread(&title_length, sizeof(unsigned char), 1, file);
+
+    // read the title
+    char *title = malloc(title_length + 1);
+    fread(title, sizeof(char), title_length, file);
+    title[title_length] = '\0';
+
+    // read the completed flag
+    bool_t completed = false;
+    fread(&completed, sizeof(bool_t), 1, file);
+
+    // create the todo item
+    TodoItem item = todo_create_item(title);
+
+    // mark the item as completed if needed
+    if (completed) {
+      todo_mark_item(&item, true);
+    }
+
+    // add the item to the list
+    arrput(todos, item);
+  }
+
+  // reset the dirty flag
+  dirty = false;
+}
+
+int main(int argc, char **argv) {
+  int terminal_width = 0;
+  int terminal_height = 0;
+  int key = 0;
+  int running = 1;
+  int current_line = 0;
+
+  // set the save file path if provided
+  if (argc > 1 && strlen(argv[1]) < MAX_PATH_LENGTH) {
+    strncpy(SAVE_FILE, argv[1], MAX_PATH_LENGTH);
+  } else {
+    // load the default save file which is "~/.todos.todd"
+    struct passwd *pw = getpwuid(getuid());
+    const char *homedir = pw->pw_dir;
+    // check if we have enough space to store the path
+    assert(strlen(homedir) + strlen("/.todos.todd") < MAX_PATH_LENGTH);
+    // create the path
+    snprintf(SAVE_FILE, MAX_PATH_LENGTH, "%s/.todos.todd", homedir);
+  }
+
+  // if file exists, load it
+  load_from_file_handler();
+  initialize_curses(&terminal_width, &terminal_height);
+
+  while (running) {
+    clear();
+    draw_header(terminal_width);
+    draw_footer(terminal_width, terminal_height);
+    display_todos(terminal_width, terminal_height, current_line);
+    refresh();
+
+    // wait for a key press
+    key = getch();
+
+    // handle the key press
+    switch (key) {
+      case LOAD_FROM_FILE:
+        load_from_file_handler();
+        alert("Loaded!", terminal_width, terminal_height);
+        break;
+      case WRITE_TO_FILE:
+        write_to_file_handler();
+        alert("Saved!", terminal_width, terminal_height);
+        break;
+      case ADD:
+        add_command_handler(terminal_width, terminal_height);
+        break;
+      case VIEW:
+        view_command_handler(terminal_width, terminal_height, current_line);
+        break;
+      case MARK:
+      case SPACE:
+        mark_command_handler(current_line);
+        break;
+      case REMOVE:
+        remove_command_handler(current_line);
+        if (current_line >= arrlen(todos)) {
+          current_line = arrlen(todos) - 1;
+        }
+        break;
+      case QUIT:
+        if (dirty) {
+          key = alert("You have unsaved changes. Save changes? [y/n]", terminal_width, terminal_height);
+          if (key == 'y') {
+            write_to_file_handler();
+          }
+        }
+        running = 0;
+        break;
+      case UP:
+      case UP_ARROW:
+        current_line--;
+        if (current_line < 0) {
+          current_line = 0;
+        }
+        break;
+      case DOWN:
+      case DOWN_ARROW:
+        current_line++;
+        if (current_line >= arrlen(todos)) {
+          current_line = arrlen(todos) - 1;
+        }
+        break;
+    }
+  }
+
+  endwin();
+
+  return 0;
 }