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
   8 #include "config.h"
   9
  10 Display *display;
  11 Window window;
  12
  13 void expire()
  14 {
  15         XEvent event;
  16         event.type = ButtonPress;
  17         XSendEvent(display, window, 0, 0, &event);
  18         XFlush(display);
  19 }
  20
  21 int main(int argc, char *argv[])
  22 {
  23         if (argc != 2)
  24         {
  25                 fprintf(stderr, "Usage: herbe message\n");
  26                 exit(EXIT_FAILURE);
  27         }
  28
  29         char *body = argv[1];
  30
  31         signal(SIGALRM, expire);
  32         alarm(duration);
  33
  34         display = XOpenDisplay(NULL);
  35
  36         if (display == NULL)
  37         {
  38                 fprintf(stderr, "Cannot open display\n");
  39                 exit(EXIT_FAILURE);
  40         }
  41
  42         int screen = DefaultScreen(display);
  43         Visual *visual = DefaultVisual(display, screen);
  44         Colormap colormap = DefaultColormap(display, screen);
  45
  46         int screen_width = DisplayWidth(display, screen);
  47         int screen_height = DisplayHeight(display, screen);
  48
  49         XftColor color;
  50
  51         XSetWindowAttributes attributes;
  52         attributes.override_redirect = True;
  53         XftColorAllocName(display, visual, colormap, background_color, &color);
  54         attributes.background_pixel = color.pixel;
  55         XftColorAllocName(display, visual, colormap, border_color, &color);
  56         attributes.border_pixel = color.pixel;
  57
  58         XftFont *font = XftFontOpenName(display, screen, font_pattern);
  59
  60         int max_text_width = width - 2 * padding;
  61         int eols_size = 5;
  62         int *eols = malloc(eols_size * sizeof(int));
  63         eols[0] = 0;
  64         int remainder = strlen(body);
  65         int num_of_lines = 1;
  66
  67         while (1)
  68         {
  69                 XGlyphInfo info;
  70                 info.width = 0;
  71                 int eol = max_text_width / font->max_advance_width;
  72                 while (info.width < max_text_width)
  73                 {
  74                         eol++;
  75                         XftTextExtentsUtf8(display, font, body + eols[num_of_lines - 1], eol, &info);
  76                 }
  77
  78                 --eol;
  79
  80                 if (eol >= remainder)
  81                 {
  82                         if (eols_size < num_of_lines + 1)
  83                         {
  84                                 eols_size += 5;
  85                                 eols = realloc(eols, eols_size * sizeof(int));
  86                         }
  87                         eols[num_of_lines] = eols[num_of_lines - 1] + remainder;
  88                         num_of_lines++;
  89                         break;
  90                 }
  91
  92                 while (body[eols[num_of_lines - 1] + eol] != ' ')
  93                         --eol;
  94
  95                 eol++;
  96
  97                 remainder -= eol;
  98                 if (eols_size < num_of_lines + 1)
  99                 {
 100                         eols_size += 5;
 101                         eols = realloc(eols, eols_size * sizeof(int));
 102                 }
 103                 eols[num_of_lines] = eols[num_of_lines - 1] + eol;
 104                 num_of_lines++;
 105         }
 106
 107         unsigned int x = pos_x;
 108         unsigned int y = pos_y;
 109         unsigned int text_height = font->ascent - font->descent;
 110         unsigned int height = (num_of_lines - 2) * line_spacing + (num_of_lines - 1) * text_height + 2 * padding;
 111
 112         switch (corner)
 113         {
 114         case BOTTOM_RIGHT:
 115                 y = screen_height - height - border_size * 2 - pos_y;
 116         case TOP_RIGHT:
 117                 x = screen_width - width - border_size * 2 - pos_x;
 118                 break;
 119         case BOTTOM_LEFT:
 120                 y = screen_height - height - border_size * 2 - pos_y;
 121         }
 122
 123         window = XCreateWindow(display, RootWindow(display, screen), x, y, width, height, border_size, DefaultDepth(display, screen), CopyFromParent, visual,
 124                                                    CWOverrideRedirect | CWBackPixel | CWBorderPixel, &attributes);
 125
 126         XftDraw *draw = XftDrawCreate(display, window, visual, colormap);
 127         XftColorAllocName(display, visual, colormap, font_color, &color);
 128
 129         XSelectInput(display, window, ExposureMask | ButtonPress);
 130
 131         XMapWindow(display, window);
 132
 133         XEvent event;
 134
 135         while (1)
 136         {
 137                 XNextEvent(display, &event);
 138
 139                 if (event.type == Expose)
 140                 {
 141                         XClearWindow(display, window);
 142                         for (int i = 1; i < num_of_lines; i++)
 143                                 XftDrawStringUtf8(draw, &color, font, padding, line_spacing * (i - 1) + text_height * i + padding, body + eols[i - 1], eols[i] - eols[i - 1]);
 144                 }
 145                 if (event.type == ButtonPress)
 146                         break;
 147         }
 148
 149         free(eols);
 150         XftDrawDestroy(draw);
 151         XftColorFree(display, visual, colormap, &color);
 152         XftFontClose(display, font);
 153
 154         XCloseDisplay(display);
 155         return EXIT_SUCCESS;
 156 }