Calendar: Implement basic writing feature

In this commit several features were added as well.
Basic writing feature to a file. Added base64 decoding
to the reading feature. Checks whether or not the terminal
is too small. Basic help page.

CMakeLists.txt

@@ -18,7 +18,7 @@ endif()
 project(vis
     VERSION 1.0 
     DESCRIPTION "Vi Scheduler (vis) is a simple TUI program built for managing your schedules in a calendar-like grid."
-    LANGUAGES CXX) 
+    LANGUAGES CXX C) 
  
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 

src/CMakeLists.txt

@@ -1,7 +1,9 @@
 add_subdirectory(engine) 
 add_subdirectory(calendar) 
+add_subdirectory(base64) 
 
 add_executable(vis main.cpp)
 
 target_link_libraries(vis engine) 
 target_link_libraries(vis calendar) 
+target_link_libraries(vis base64) 

src/base64/CMakeLists.txt

@@ -0,0 +1 @@
+add_library(base64 SHARED base64.c)

src/base64/base64.c

@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/* ====================================================================
+ * Copyright (c) 1995-1999 The Apache Group.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the Apache Group
+ *    for use in the Apache HTTP server project (http://www.apache.org/)."
+ *
+ * 4. The names "Apache Server" and "Apache Group" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Group.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the Apache Group
+ *    for use in the Apache HTTP server project (http://www.apache.org/)."
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Group and was originally based
+ * on public domain software written at the National Center for
+ * Supercomputing Applications, University of Illinois, Urbana-Champaign.
+ * For more information on the Apache Group and the Apache HTTP server
+ * project, please see <http://www.apache.org/>.
+ *
+ */
+
+/* Base64 encoder/decoder. Originally Apache file ap_base64.c
+ */
+
+#include <string.h>
+
+#include "base64.h"
+
+/* aaaack but it's fast and const should make it shared text page. */
+static const unsigned char pr2six[256] =
+{
+    /* ASCII table */
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
+    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
+    64,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
+    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
+    64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
+};
+
+int Base64decode_len(const char *bufcoded)
+{
+    int nbytesdecoded;
+    register const unsigned char *bufin;
+    register int nprbytes;
+
+    bufin = (const unsigned char *) bufcoded;
+    while (pr2six[*(bufin++)] <= 63);
+
+    nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
+    nbytesdecoded = ((nprbytes + 3) / 4) * 3;
+
+    return nbytesdecoded + 1;
+}
+
+int Base64decode(char *bufplain, const char *bufcoded)
+{
+    int nbytesdecoded;
+    register const unsigned char *bufin;
+    register unsigned char *bufout;
+    register int nprbytes;
+
+    bufin = (const unsigned char *) bufcoded;
+    while (pr2six[*(bufin++)] <= 63);
+    nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
+    nbytesdecoded = ((nprbytes + 3) / 4) * 3;
+
+    bufout = (unsigned char *) bufplain;
+    bufin = (const unsigned char *) bufcoded;
+
+    while (nprbytes > 4) {
+    *(bufout++) =
+        (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
+    *(bufout++) =
+        (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
+    *(bufout++) =
+        (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
+    bufin += 4;
+    nprbytes -= 4;
+    }
+
+    /* Note: (nprbytes == 1) would be an error, so just ingore that case */
+    if (nprbytes > 1) {
+    *(bufout++) =
+        (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
+    }
+    if (nprbytes > 2) {
+    *(bufout++) =
+        (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
+    }
+    if (nprbytes > 3) {
+    *(bufout++) =
+        (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
+    }
+
+    *(bufout++) = '\0';
+    nbytesdecoded -= (4 - nprbytes) & 3;
+    return nbytesdecoded;
+}
+
+static const char basis_64[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+int Base64encode_len(int len)
+{
+    return ((len + 2) / 3 * 4) + 1;
+}
+
+int Base64encode(char *encoded, const char *string, int len)
+{
+    int i;
+    char *p;
+
+    p = encoded;
+    for (i = 0; i < len - 2; i += 3) {
+    *p++ = basis_64[(string[i] >> 2) & 0x3F];
+    *p++ = basis_64[((string[i] & 0x3) << 4) |
+                    ((int) (string[i + 1] & 0xF0) >> 4)];
+    *p++ = basis_64[((string[i + 1] & 0xF) << 2) |
+                    ((int) (string[i + 2] & 0xC0) >> 6)];
+    *p++ = basis_64[string[i + 2] & 0x3F];
+    }
+    if (i < len) {
+    *p++ = basis_64[(string[i] >> 2) & 0x3F];
+    if (i == (len - 1)) {
+        *p++ = basis_64[((string[i] & 0x3) << 4)];
+        *p++ = '=';
+    }
+    else {
+        *p++ = basis_64[((string[i] & 0x3) << 4) |
+                        ((int) (string[i + 1] & 0xF0) >> 4)];
+        *p++ = basis_64[((string[i + 1] & 0xF) << 2)];
+    }
+    *p++ = '=';
+    }
+
+    *p++ = '\0';
+    return p - encoded;
+}

src/base64/base64.h

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/* ====================================================================
+ * Copyright (c) 1995-1999 The Apache Group.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the Apache Group
+ *    for use in the Apache HTTP server project (http://www.apache.org/)."
+ *
+ * 4. The names "Apache Server" and "Apache Group" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Group.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the Apache Group
+ *    for use in the Apache HTTP server project (http://www.apache.org/)."
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Group and was originally based
+ * on public domain software written at the National Center for
+ * Supercomputing Applications, University of Illinois, Urbana-Champaign.
+ * For more information on the Apache Group and the Apache HTTP server
+ * project, please see <http://www.apache.org/>.
+ *
+ */
+
+
+
+#ifndef _BASE64_H_
+#define _BASE64_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int Base64encode_len(int len);
+int Base64encode(char * coded_dst, const char *plain_src,int len_plain_src);
+
+int Base64decode_len(const char * coded_src);
+int Base64decode(char * plain_dst, const char *coded_src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //_BASE64_H_

src/engine/engine.cpp

@@ -3,7 +3,6 @@
 #include <string.h>
 #include <ncurses.h>
 #include <signal.h>
-#include <regex>
 #include "engine.hpp"
 
 Engine::Engine(int padding, calendar_view_mode view_mode) {
@@ -21,6 +20,15 @@ Engine::~Engine() {
 }
 
 void Engine::ui_draw(WINDOW *win) {
+    int screen_width, screen_height;
+    getmaxyx(win, screen_height, screen_width);
+
+    if (screen_height < 25 || screen_width < 70) {
+        this->ui_warning_draw(win, "Window resolution too small, please resize it."); return;
+        return;
+    }
+
+    this->input_block = false;
     this->cells_table.clear(); 
 
     box(win, 0, 0);
@@ -46,6 +54,14 @@ void Engine::ui_draw(WINDOW *win) {
     wrefresh(win);
 }
 
+void Engine::ui_warning_draw(WINDOW *win, const char *message) {
+    this->input_block = true;
+
+    mvwprintw(win, 0, 0, "%s", message);
+
+    wrefresh(win);
+}
+
 void Engine::ui_month_draw(WINDOW *win) {
     calendar_information date_info = this->calendar->get_info(); 
     int z = COLS - this->padding;
@@ -109,6 +125,9 @@ void Engine::ui_bottom_draw(WINDOW *win) {
 void Engine::input_handle(WINDOW *win) {
     char key = getch(); 
 
+    if (this->input_block) 
+        return;
+
     if (this->input_handle_universal(win, key))
         return;
 
@@ -203,9 +222,12 @@ bool Engine::input_handle_universal(WINDOW *win, char key) {
             break;
         }
         case 'w': 
+            this->write_calendar();
             break;
         case 'q': 
             endwin(); 
+            this->calendar_file.close();
+
             exit(EXIT_SUCCESS);
             break;
         default: 
@@ -283,12 +305,20 @@ void Engine::parse_line(std::string line) {
     if (tokens.size() != 2) 
         return;
 
+    // decode the event from base64 before adding it into the events_map
     calendar_information event_date = this->parse_date(tokens[0]); 
-    this->events_map[event_date] = tokens[1];
+
+    int decoded_length = Base64decode_len((const char *) tokens[1].c_str());
+    char *event_decoded = (char *) malloc(decoded_length);
+
+    Base64decode(event_decoded, tokens[1].c_str());
+
+    this->events_map[event_date] = event_decoded;
 }
 
 void Engine::open_calendar(char *filename) {
-    this->calendar_file.open(filename, std::ios::in | std::ios::out);
+    this->calendar_file.open(filename, std::ios::in);
+    this->calendar_file_location = filename;
 
     // If the file does not exist, 
     // we'll create and reopen it later ('write' shortcut)
@@ -300,3 +330,34 @@ void Engine::open_calendar(char *filename) {
         this->parse_line(line);
     } 
 }
+
+bool Engine::write_calendar() {
+    this->calendar_file.close();
+    this->calendar_file.open(this->calendar_file_location, std::ios::out | std::ios::trunc);
+
+    if (this->calendar_file.fail()) {
+        mvprintw(0, 0, "Error saving file.");        
+        refresh();
+        getch();
+        return false;
+    }
+
+    for (auto const& event : this->events_map) {
+        std::stringstream output_line;
+
+        calendar_information date = event.first;
+
+        int encoded_length = Base64encode_len(event.second.length());
+        char *event_encoded = (char *) malloc(encoded_length);
+        Base64encode(event_encoded, event.second.c_str(), event.second.length());
+
+        output_line << date.current_day << ".";
+        output_line << date.current_month << "."; 
+        output_line << date.current_year << " "; 
+        output_line << event_encoded;
+
+        this->calendar_file << output_line.str() << std::endl;
+    }
+    
+    return true;
+}

src/engine/engine.hpp

@@ -2,11 +2,12 @@
 #define ENGINE_HPP 
 
 #include <iostream>
+#include <sstream>
 #include <fstream>
 #include <ncurses.h>
 #include <vector>
-// #include <unordered_map>
 #include <map>
+#include "../base64/base64.h"
 #include "../calendar/calendar.hpp"
 #include "../global/global.hpp"
 
@@ -45,12 +46,14 @@ class Engine {
         ~Engine();
 
         void ui_draw(WINDOW *win);
+        void ui_warning_draw(WINDOW *win, const char *message);
         void ui_month_draw(WINDOW *win); 
         void ui_week_draw(WINDOW *win);
         void ui_months_draw(WINDOW *win);
         void ui_bottom_draw(WINDOW *win);
         void ui_top_draw(WINDOW *win);
 
+        bool input_block;
         void input_handle(WINDOW* win);
         bool input_handle_universal(WINDOW *win, char key);
         void input_handle_month(WINDOW *win, char key);
@@ -60,6 +63,7 @@ class Engine {
         calendar_information parse_date(std::string date);
         void parse_line(std::string line);
         void open_calendar(char *filename);
+        bool write_calendar();
 
         Calendar *calendar; 
         // std::unordered_map<calendar_information, std::string> events_map;
@@ -68,10 +72,10 @@ class Engine {
 
         calendar_view_mode view_mode; 
         int padding; // padding
-        
     private:
         std::vector<engine_child> cells_table;
         std::fstream calendar_file; 
+        char * calendar_file_location;
 };
 
 #endif

src/main.cpp

@@ -17,10 +17,10 @@ void sig_winch(int sig) {
     wrefresh(main_win);
 
     wresize(main_win, LINES, COLS);
-
     mvwin(main_win, 0, 0);
     
-    // redraw the TUI after the resize signal
+    // if the resolution is too small, output a warning
+    // else redraw the TUI 
     engine.ui_draw(main_win);
 
     flushinp();
@@ -32,7 +32,16 @@ void signals() {
 }
 
 void print_help() {
-
+    std::cout << "\
+VIS - Vim Scheduler\
+\n\
+\nUsage: vis [file]\
+\n\
+\nModes: \
+\n  - Month view (default): view the current month\
+\n  - Week view: view the current week\
+\n  - Months view: view the current year\
+" << std::endl;
 }
 
 bool check_args(int argc, char **argv) {
@@ -54,6 +63,7 @@ int main(int argc, char **argv) {
     refresh();
 
     curs_set(0); // invisible cursor 
+    noecho();
     refresh();
 
     main_win = newwin(LINES, COLS, 0, 0);