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 <math.h>
   8
   9 #include "config.h"
  10
  11 Display *display;
  12 Window window;
  13
  14 int get_eol(char *body, XftFont *font)
  15 {
  16         int body_len = strlen(body);
  17         XGlyphInfo info;
  18         XftTextExtentsUtf8(display, font, body, body_len, &info);
  19
  20         int max_text_width = width - 2 * padding;
  21
  22         if (info.width < max_text_width)
  23                 return body_len;
  24
  25         int eol = max_text_width / font->max_advance_width;
  26         info.width = 0;
  27
  28         while (info.width < max_text_width)
  29         {
  30                 eol++;
  31                 XftTextExtentsUtf8(display, font, body, eol, &info);
  32         }
  33
  34         return --eol;
  35
  36         // if (body[eol] == ' ')
  37         //      return --eol;
  38
  39         // while (body[eol] != ' ')
  40         // {
  41         //      eol--;
  42         // }
  43
  44         // return ++eol;
  45 }
  46
  47 void expire()
  48 {
  49         XEvent event;
  50         event.type = ButtonPress;
  51         XSendEvent(display, window, 0, 0, &event);
  52         XFlush(display);
  53 }
  54
  55 int main(int argc, char *argv[])
  56 {
  57         if (argc != 2)
  58         {
  59                 fprintf(stderr, "Usage: herbe message\n");
  60                 exit(EXIT_FAILURE);
  61         }
  62
  63         char *body = argv[1];
  64
  65         signal(SIGALRM, expire);
  66         alarm(duration);
  67
  68         display = XOpenDisplay(NULL);
  69
  70         if (display == NULL)
  71         {
  72                 fprintf(stderr, "Cannot open display\n");
  73                 exit(EXIT_FAILURE);
  74         }
  75
  76         int screen = DefaultScreen(display);
  77         Visual *visual = DefaultVisual(display, screen);
  78         Colormap colormap = DefaultColormap(display, screen);
  79
  80         int window_width = DisplayWidth(display, screen);
  81         int window_height = DisplayHeight(display, screen);
  82
  83         XftColor color;
  84
  85         XSetWindowAttributes attributes;
  86         attributes.override_redirect = True;
  87         XftColorAllocName(display, visual, colormap, background_color, &color);
  88         attributes.background_pixel = color.pixel;
  89         XftColorAllocName(display, visual, colormap, border_color, &color);
  90         attributes.border_pixel = color.pixel;
  91
  92         XftFont *font = XftFontOpenName(display, screen, font_pattern);
  93
  94         unsigned int x = pos_x;
  95         unsigned int y = pos_y;
  96         unsigned int height = font->ascent - font->descent + padding * 2;
  97
  98         switch (corner)
  99         {
 100         case BOTTOM_RIGHT:
 101                 y = window_height - height - border_size * 2 - pos_y;
 102         case TOP_RIGHT:
 103                 x = window_width - width - border_size * 2 - pos_x;
 104                 break;
 105         case BOTTOM_LEFT:
 106                 y = window_height - height - border_size * 2 - pos_y;
 107         }
 108
 109         XGlyphInfo info;
 110         XftTextExtentsUtf8(display, font, body, strlen(body), &info);
 111         int num_of_lines = ceil((float)info.width / (width - 2 * padding));
 112
 113         window = XCreateWindow(
 114                 display, RootWindow(display, screen), x,
 115                 y, width, (num_of_lines - 1) * 5 + num_of_lines * (font->ascent - font->descent) + 2 * padding, border_size,
 116                 DefaultDepth(display, screen), CopyFromParent,
 117                 visual,
 118                 CWOverrideRedirect | CWBackPixel | CWBorderPixel, &attributes);
 119
 120         XftDraw *draw = XftDrawCreate(display, window, visual, colormap);
 121         XftColorAllocName(display, visual, colormap, font_color, &color);
 122
 123         XSelectInput(display, window, ExposureMask | ButtonPress);
 124
 125         XMapWindow(display, window);
 126
 127         int eols[num_of_lines + 1];
 128         eols[0] = 0;
 129
 130         for (int i = 1; i < num_of_lines + 1; i++)
 131         {
 132                 eols[i] = eols[i - 1] + get_eol(body + eols[i - 1], font);
 133         }
 134
 135         XEvent event;
 136
 137         while (1)
 138         {
 139                 XNextEvent(display, &event);
 140
 141                 if (event.type == Expose)
 142                 {
 143                         XClearWindow(display, window);
 144
 145                         for (int i = 1; i < num_of_lines + 1; i++)
 146                         {
 147                                 XftDrawStringUtf8(draw, &color, font, padding, 5 * (i - 1) + (font->ascent - font->descent) * i + padding, body + eols[i - 1], eols[i] - eols[i - 1]);
 148                         }
 149                 }
 150                 if (event.type == ButtonPress)
 151                         break;
 152         }
 153
 154         XftDrawDestroy(draw);
 155         XftColorFree(display, visual, colormap, &color);
 156         XftFontClose(display, font);
 157
 158         XCloseDisplay(display);
 159         return EXIT_SUCCESS;
 160 }