herbe.c

   1 #include <X11/Xlib.h>
   2 #include <X11/Xft/Xft.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <signal.h>
   6 #include <unistd.h>
   7 #include <string.h>
   8 #include <stdarg.h>
   9 #include <fcntl.h>
  10 #include <semaphore.h>
  11
  12 #include "config.h"
  13
  14 #define EXIT_ACTION 3
  15
  16 Display *display;
  17 Window window;
  18 int exit_code = EXIT_SUCCESS;
  19
  20 static void die(const char *format, ...)
  21 {
  22         va_list ap;
  23         va_start(ap, format);
  24         vfprintf(stderr, format, ap);
  25         fprintf(stderr, "\n");
  26         va_end(ap);
  27         exit(EXIT_FAILURE);
  28 }
  29
  30 int get_max_len(char *body, XftFont *font, int max_text_width)
  31 {
  32         int eol = strlen(body);
  33         XGlyphInfo info;
  34         XftTextExtentsUtf8(display, font, (FcChar8 *)body, eol, &info);
  35
  36         if (info.width > max_text_width)
  37         {
  38
  39                 eol = max_text_width / font->max_advance_width;
  40                 info.width = 0;
  41
  42                 while (info.width < max_text_width)
  43                 {
  44                         eol++;
  45                         XftTextExtentsUtf8(display, font, (FcChar8 *)body, eol, &info);
  46                 }
  47
  48                 eol--;
  49         }
  50
  51         for (int i = 0; i < eol; i++)
  52                 if (body[i] == '\n')
  53                 {
  54                         body[i] = ' ';
  55                         return ++i;
  56                 }
  57
  58         if (info.width < max_text_width)
  59                 return eol;
  60
  61         int temp = eol;
  62
  63         while (body[eol] != ' ' && eol)
  64                 --eol;
  65
  66         if (eol == 0)
  67                 return temp;
  68         else
  69                 return ++eol;
  70 }
  71
  72 void expire()
  73 {
  74         XEvent event;
  75         event.type = ButtonPress;
  76         XSendEvent(display, window, 0, 0, &event);
  77         XFlush(display);
  78 }
  79
  80 void action()
  81 {
  82         exit_code = EXIT_ACTION;
  83         expire();
  84 }
  85
  86 int main(int argc, char *argv[])
  87 {
  88         if (argc == 1)
  89                 die("Usage: %s body", argv[0]);
  90
  91         signal(SIGALRM, expire);
  92         signal(SIGTERM, expire);
  93         signal(SIGINT, expire);
  94         signal(SIGUSR1, SIG_IGN);
  95         signal(SIGUSR2, SIG_IGN);
  96
  97         display = XOpenDisplay(0);
  98
  99         if (display == 0)
 100                 die("Cannot open display");
 101
 102         int screen = DefaultScreen(display);
 103         Visual *visual = DefaultVisual(display, screen);
 104         Colormap colormap = DefaultColormap(display, screen);
 105
 106         int screen_width = DisplayWidth(display, screen);
 107         int screen_height = DisplayHeight(display, screen);
 108
 109         XftColor color;
 110
 111         XSetWindowAttributes attributes;
 112         attributes.override_redirect = True;
 113         XftColorAllocName(display, visual, colormap, background_color, &color);
 114         attributes.background_pixel = color.pixel;
 115         XftColorAllocName(display, visual, colormap, border_color, &color);
 116         attributes.border_pixel = color.pixel;
 117
 118         XftFont *font = XftFontOpenName(display, screen, font_pattern);
 119
 120         int num_of_lines = 0;
 121         int max_text_width = width - 2 * padding;
 122         int words_size = 5;
 123         char **words = malloc(words_size * sizeof(char *));
 124         if (!words)
 125                 die("malloc failed");
 126
 127         for (int i = 1; i < argc; i++)
 128         {
 129                 char *body = argv[i];
 130
 131                 for (unsigned int eol = get_max_len(body, font, max_text_width); eol <= strlen(body) && eol; body += eol, num_of_lines++, eol = get_max_len(body, font, max_text_width))
 132                 {
 133                         if (words_size <= num_of_lines)
 134                         {
 135                                 words = realloc(words, (words_size += 5) * sizeof(char *));
 136                                 if (!words)
 137                                         die("malloc failed");
 138                         }
 139                         words[num_of_lines] = malloc((eol + 1) * sizeof(char));
 140                         if (!words[num_of_lines])
 141                                 die("malloc failed");
 142                         strncpy(words[num_of_lines], body, eol);
 143                         words[num_of_lines][eol] = '\0';
 144                 }
 145         }
 146
 147         unsigned int x = pos_x;
 148         unsigned int y = pos_y;
 149         unsigned int text_height = font->ascent - font->descent;
 150         unsigned int height = (num_of_lines - 1) * line_spacing + num_of_lines * text_height + 2 * padding;
 151
 152         if (corner == TOP_RIGHT || corner == BOTTOM_RIGHT)
 153                 x = screen_width - width - border_size * 2 - pos_x;
 154
 155         if (corner == BOTTOM_LEFT || corner == BOTTOM_RIGHT)
 156                 y = screen_height - height - border_size * 2 - pos_y;
 157
 158         window = XCreateWindow(display, RootWindow(display, screen), x, y, width, height, border_size, DefaultDepth(display, screen), CopyFromParent, visual,
 159                                                    CWOverrideRedirect | CWBackPixel | CWBorderPixel, &attributes);
 160
 161         XftDraw *draw = XftDrawCreate(display, window, visual, colormap);
 162         XftColorAllocName(display, visual, colormap, font_color, &color);
 163
 164         XSelectInput(display, window, ExposureMask | ButtonPress);
 165
 166         XMapWindow(display, window);
 167
 168         sem_t *mutex = sem_open("/herbe", O_CREAT, 0644, 1);
 169         sem_wait(mutex);
 170
 171         signal(SIGUSR1, expire);
 172         signal(SIGUSR2, action);
 173
 174         if (duration != 0)
 175                 alarm(duration);
 176
 177         while (1)
 178         {
 179                 XEvent event;
 180                 XNextEvent(display, &event);
 181
 182                 if (event.type == Expose)
 183                 {
 184                         XClearWindow(display, window);
 185                         for (int i = 0; i < num_of_lines; i++)
 186                                 XftDrawStringUtf8(draw, &color, font, padding, line_spacing * i + text_height * (i + 1) + padding, (FcChar8 *)words[i], strlen(words[i]));
 187                 }
 188                 if (event.type == ButtonPress)
 189                 {
 190                         if (event.xbutton.button == DISMISS_BUTTON)
 191                                 break;
 192                         else if (event.xbutton.button == ACTION_BUTTON)
 193                         {
 194                                 exit_code = EXIT_ACTION;
 195                                 break;
 196                         }
 197                 }
 198         }
 199
 200         sem_post(mutex);
 201         sem_close(mutex);
 202
 203         for (int i = 0; i < num_of_lines; i++)
 204                 free(words[i]);
 205
 206         free(words);
 207         XftDrawDestroy(draw);
 208         XftColorFree(display, visual, colormap, &color);
 209         XftFontClose(display, font);
 210         XCloseDisplay(display);
 211
 212         exit(exit_code);
 213 }