Calendar: Implement basic reading feature

This commit contains a lot of different changes.
Starting from some refacting of user input code,
coloring, and adding a basic reading feature to
the program.

README.md

@@ -30,9 +30,11 @@ For example: `vis school.cal`
 This will open the default view mode (month) and display the current month's calendar. From there, you can use the following commands to navigate and edit the calendar: 
  - `h/j/k/l` - Move 1 day left/down/up/right
  - `u/o` - Move 1 month left/right
- - `gg` - Go to the beginning of the month
+ - `g` - Go to the beginning of the month
  - `G` - Go to the end of the month
- - `i` - Enter insert mode for the active day.
+ - `i` - Enter insert mode for selected day.
+ - `x` - Delete event from selected day.
+ - `w` - Write changes to file (i.e. save)
  - `q` - Quit and save the calendar
 
 # Todos 

src/calendar/calendar.cpp

@@ -11,6 +11,13 @@ calendar_information::calendar_information() {
     current_month_days = Calendar::get_days_in_month(current_month, current_year);
 }
 
+calendar_information::calendar_information(int cday, int cmonth, int cyear) {
+    current_day = cday;
+    current_month = cmonth;
+    current_year = cyear;
+    current_month_days = Calendar::get_days_in_month(current_month, current_year);
+}
+
 int Calendar::get_days_in_month(int month, int year) {
     tm date = {0};
     date.tm_year = year - 1900; 
@@ -45,7 +52,12 @@ calendar_information Calendar::get_info() {
     return this->info;
 }
 
+calendar_information Calendar::get_current_date() {
+    return this->current_date;
+}
+
 Calendar::Calendar(calendar_information *preinfo) {
+    this->current_date = calendar_information();
     this->info = *preinfo; 
 
     if (preinfo != nullptr)
@@ -53,3 +65,25 @@ Calendar::Calendar(calendar_information *preinfo) {
 
     this->info = calendar_information(); 
 }
+
+// https://stackoverflow.com/questions/6054016/c-program-to-find-day-of-week-given-date
+int get_weekday(calendar_information *date_info) {
+    if (date_info == nullptr) 
+        return 0;
+    
+    int d = date_info->current_day;
+    int m = date_info->current_month;
+    int y = date_info->current_year;
+
+    return (d += m < 3 ? y-- : y - 2, 23*m/9 + d + 4 + y/4- y/100 + y/400)%7;  
+
+}
+
+int datecmp(calendar_information *one, calendar_information *two) {
+    if (one->current_day != two->current_day) return 0;
+    if (one->current_month != two->current_month) return 0;
+    if (one->current_month_days != two->current_month_days) return 0;
+    if (one->current_year != two->current_year) return 0;
+    return 1;
+}
+

src/calendar/calendar.hpp

@@ -10,6 +10,7 @@ struct calendar_information {
     int current_year; 
 
     calendar_information();
+    calendar_information(int cday, int cmonth, int cyear);
 }; 
 
 const bool operator<(const calendar_information& first, const calendar_information& second) {
@@ -23,11 +24,17 @@ class Calendar {
         void set_day(int day); 
         void set_month(int month);
         void set_year(int year);
-        calendar_information get_info();
 
+        calendar_information get_info();
+        calendar_information get_current_date();
         Calendar(calendar_information *preinfo = nullptr); 
 
     private:
-        calendar_information info; 
+        calendar_information info; // mutable date that can be changed
+        calendar_information current_date; // current date 
 }; 
+
+int get_weekday(calendar_information *date_info = nullptr);
+int datecmp(calendar_information *one, calendar_information *two);
+
 #endif

src/engine/engine.cpp

@@ -1,7 +1,9 @@
 #include <stdlib.h>
+#include <string>
 #include <string.h>
 #include <ncurses.h>
 #include <signal.h>
+#include <regex>
 #include "engine.hpp"
 
 Engine::Engine(int padding, calendar_view_mode view_mode) {
@@ -60,12 +62,20 @@ void Engine::ui_month_draw(WINDOW *win) {
         if (this->events_map.count(tmp_date) > 0)
             wattron(win, COLOR_PAIR(2));
 
+        calendar_information current_date = this->calendar->get_current_date();
+        if (datecmp(&current_date, &tmp_date)) 
+            wattron(win, COLOR_PAIR(3));
+
         if (this->active_cell == i) 
             wattron(win, COLOR_PAIR(1));
 
-        mvwprintw(win, y_location, x_location, "D%d", i+1);
+        std::string weekday_prefix = weekday_prefixes[get_weekday(&tmp_date)];
+
+        // mvwprintw(win, y_location, x_location, "D%d", i+1);
+        mvwprintw(win, y_location, x_location, "%s[%d]", weekday_prefix.c_str(), i+1);
         wattroff(win, COLOR_PAIR(1));
         wattroff(win, COLOR_PAIR(2));
+        wattroff(win, COLOR_PAIR(3));
     }
 }
 
@@ -81,7 +91,6 @@ void Engine::ui_top_draw(WINDOW *win) {
     if (VIS_COLORING) wattron(win, COLOR_PAIR(1));
 
     mvwprintw(win, 1, 1, "Vi Scheduler");
-    mvwprintw(win, 2, 1, "@0xdeadbeer");
 
     if (VIS_COLORING) wattroff(win, COLOR_PAIR(1));
 }
@@ -97,12 +106,24 @@ void Engine::ui_bottom_draw(WINDOW *win) {
     if (VIS_COLORING) wattroff(win, COLOR_PAIR(1));
 }
 
-void Engine::input_handle_month(WINDOW *win) {
+void Engine::input_handle(WINDOW *win) {
     char key = getch(); 
     
-    calendar_information date_info = this->calendar->get_info();
+    if (this->input_handle_universal(win, key))
+        return;
 
-    int day, month, res;
+    if (this->view_mode == MONTH_VIEW)
+        this->input_handle_month(win, key);
+    else if (this->view_mode == WEEK_VIEW) 
+        this->input_handle_week(win, key); 
+    else if (this->view_mode == MONTHS_VIEW) 
+        this->input_handle_months(win, key);
+
+    // fuc.
+}
+
+bool Engine::input_handle_universal(WINDOW *win, char key) {
+    int day;
     switch (key) {
         case 'h': 
             if (this->calendar->get_info().current_day <= 1) break;
@@ -128,32 +149,14 @@ void Engine::input_handle_month(WINDOW *win) {
 
             this->active_cell += 7;
             break;
-        case 'k': 
             if (this->calendar->get_info().current_day-7 < 1) break;
+        case 'k': 
 
             day = this->calendar->get_info().current_day;
             this->calendar->set_day(day-7);
 
             this->active_cell -= 7;
             break;
-        case 'u': 
-            if (this->calendar->get_info().current_month <= 1) break;
-
-            month = this->calendar->get_info().current_month;
-            this->calendar->set_month(--month);
-            this->calendar->set_day(1);
-
-            this->active_cell = 0;
-            break;
-        case 'o':
-            if (this->calendar->get_info().current_month >= 12) break;
-
-            month = this->calendar->get_info().current_month; 
-            this->calendar->set_month(++month);
-            this->calendar->set_day(1);
-
-            this->active_cell = 0;
-            break;
         case 'i': { // TODO: Break down this monstrocity of a case
             endwin();
             int vipe_out[2], vipe_in[2];  
@@ -200,6 +203,44 @@ void Engine::input_handle_month(WINDOW *win) {
             this->events_map.erase(date_info);
             break;
         }
+        case 'w': 
+            break;
+        case 'q': 
+            endwin(); 
+            exit(EXIT_SUCCESS);
+            break;
+        default: 
+            return false;
+            break;
+    } 
+
+    return true;
+}
+
+void Engine::input_handle_month(WINDOW *win, char key) {
+
+    calendar_information date_info = this->calendar->get_info();
+
+    int month;
+    switch (key) {
+       case 'u': 
+            if (this->calendar->get_info().current_month <= 1) break;
+
+            month = this->calendar->get_info().current_month;
+            this->calendar->set_month(--month);
+            this->calendar->set_day(1);
+
+            this->active_cell = 0;
+            break;
+        case 'o':
+            if (this->calendar->get_info().current_month >= 12) break;
+
+            month = this->calendar->get_info().current_month; 
+            this->calendar->set_month(++month);
+            this->calendar->set_day(1);
+
+            this->active_cell = 0;
+            break;
         case 'g': 
             this->calendar->set_day(1);
             this->active_cell = 0;
@@ -208,17 +249,55 @@ void Engine::input_handle_month(WINDOW *win) {
             this->calendar->set_day(this->calendar->get_info().current_month_days);
             this->active_cell = this->calendar->get_info().current_month_days-1;
             break;
-        case 't': 
-            this->view_mode = WEEK_VIEW;
-            wclear(win);
-            break;
     }
 }
 
-void Engine::input_handle_week(WINDOW *win) {
+void Engine::input_handle_week(WINDOW *win, char key) {
     // TODO
 }
 
-void Engine::input_handle_months(WINDOW *win) {
+void Engine::input_handle_months(WINDOW *win, char key) {
     // TODO
 }
+
+calendar_information Engine::parse_date(std::string date) {
+    char *token = strtok((char *) date.c_str(), ".");  
+    std::vector<int> tokens;
+
+    while (token != NULL) {
+        tokens.push_back(std::stoi(token));
+        token = strtok(NULL, ".");
+    }
+
+    return calendar_information(tokens[0], tokens[1], tokens[2]);
+}
+
+void Engine::parse_line(std::string line) {
+    char *token = strtok((char *) line.c_str(), " ");
+    std::vector<std::string> tokens;
+
+    while (token != NULL) {
+        tokens.push_back(token);
+        token = strtok(NULL, " ");
+    }
+
+    if (tokens.size() != 2) 
+        return;
+
+    calendar_information event_date = this->parse_date(tokens[0]); 
+    this->events_map[event_date] = tokens[1];
+}
+
+void Engine::open_calendar(char *filename) {
+    this->calendar_file.open(filename, std::ios::in | std::ios::out);
+
+    // If the file does not exist, 
+    // we'll create and reopen it later ('write' shortcut)
+    if (this->calendar_file.fail()) 
+        return;
+    
+    std::string line;
+    while (std::getline(this->calendar_file, line)) {
+        this->parse_line(line);
+    } 
+}

src/engine/engine.hpp

@@ -2,6 +2,7 @@
 #define ENGINE_HPP 
 
 #include <iostream>
+#include <fstream>
 #include <ncurses.h>
 #include <vector>
 // #include <unordered_map>
@@ -20,6 +21,16 @@ enum calendar_view_mode {
     MONTHS_VIEW
 };
 
+std::string weekday_prefixes[] = {
+    "Sun",
+    "Mon",
+    "Tue",
+    "Wed",
+    "Thu",
+    "Fri",
+    "Sat"
+};
+
 std::string calendar_view_mode_str[] = {
     "MONTH_VIEW",
     "WEEK_VIEW",
@@ -30,7 +41,7 @@ std::string calendar_view_mode_str[] = {
 // description: use for drawing the TUI and interact with the cells
 class Engine {
     public: 
-        Engine(int padding = 10, calendar_view_mode view_mode = MONTH_VIEW);
+        Engine(int padding, calendar_view_mode view_mode);
         ~Engine();
 
         void ui_draw(WINDOW *win);
@@ -40,9 +51,15 @@ class Engine {
         void ui_bottom_draw(WINDOW *win);
         void ui_top_draw(WINDOW *win);
 
-        void input_handle_month(WINDOW *win);
+        void input_handle(WINDOW* win);
-        void input_handle_week(WINDOW *win);
+        bool input_handle_universal(WINDOW *win, char key);
-        void input_handle_months(WINDOW *win);
+        void input_handle_month(WINDOW *win, char key);
+        void input_handle_week(WINDOW *win, char key);
+        void input_handle_months(WINDOW *win, char key);
+
+        calendar_information parse_date(std::string date);
+        void parse_line(std::string line);
+        void open_calendar(char *filename);
 
         Calendar *calendar; 
         // std::unordered_map<calendar_information, std::string> events_map;
@@ -54,7 +71,7 @@ class Engine {
         
     private:
         std::vector<engine_child> cells_table;
-
+        std::fstream calendar_file; 
 };
 
 #endif

src/main.cpp

@@ -6,7 +6,7 @@
 #include "engine/engine.hpp"
 #include "global/global.hpp"
 
-Engine engine = Engine(10, MONTH_VIEW);
+Engine engine(10, MONTH_VIEW);
 WINDOW *main_win; 
 
 void sig_winch(int sig) {
@@ -31,7 +31,25 @@ void signals() {
     signal(SIGWINCH, sig_winch);
 }
 
-int main() {
+void print_help() {
+
+}
+
+bool check_args(int argc, char **argv) {
+    if (argc != 2) {
+        print_help();
+        return false;
+    }
+
+    engine.open_calendar(argv[1]);
+
+    return true;
+}
+
+int main(int argc, char **argv) {
+    if (!check_args(argc, argv))
+        return EXIT_FAILURE;
+
     initscr();
     refresh();
 
@@ -49,6 +67,7 @@ int main() {
         init_pair(0, COLOR_WHITE, COLOR_BLACK);
         init_pair(1, COLOR_BLACK, COLOR_WHITE); 
         init_pair(2, COLOR_BLACK, COLOR_RED); 
+        init_pair(3, COLOR_BLACK, COLOR_GREEN); 
     }
 
     // handle required signals 
@@ -57,14 +76,10 @@ int main() {
     for (;;) {
         engine.ui_draw(main_win);
 
-        if (engine.view_mode == MONTH_VIEW) 
+        engine.input_handle(main_win);
-            engine.input_handle_month(main_win);
-        if (engine.view_mode == WEEK_VIEW) 
-            engine.input_handle_week(main_win);
-        else if (engine.view_mode == MONTHS_VIEW) 
-            engine.input_handle_months(main_win);
     }
 
+
     endwin();
 
     return 0;