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 int get_max_len(char *body, XftFont *font, int max_text_width)
  14 {
  15         int body_len = strlen(body);
  16         XGlyphInfo info;
  17         XftTextExtentsUtf8(display, font, (FcChar8 *)body, body_len, &info);
  18
  19         if (info.width < max_text_width)
  20                 return body_len;
  21
  22         int eol = max_text_width / font->max_advance_width;
  23         info.width = 0;
  24
  25         while (info.width < max_text_width)
  26         {
  27                 eol++;
  28                 XftTextExtentsUtf8(display, font, (FcChar8 *)body, eol, &info);
  29         }
  30
  31         eol--;
  32
  33         int temp = eol;
  34
  35         while (body[eol] != ' ' && eol)
  36                 --eol;
  37
  38         if (eol == 0)
  39                 return temp;
  40         else
  41                 return ++eol;
  42 }
  43
  44 void expire()
  45 {
  46         XEvent event;
  47         event.type = ButtonPress;
  48         XSendEvent(display, window, 0, 0, &event);
  49         XFlush(display);
  50 }
  51
  52 int main(int argc, char *argv[])
  53 {
  54         if (argc == 1)
  55         {
  56                 fprintf(stderr, "Usage: herbe body\n");
  57                 exit(EXIT_FAILURE);
  58         }
  59
  60         signal(SIGALRM, expire);
  61         alarm(duration);
  62
  63         display = XOpenDisplay(NULL);
  64
  65         if (display == NULL)
  66         {
  67                 fprintf(stderr, "Cannot open display\n");
  68                 exit(EXIT_FAILURE);
  69         }
  70
  71         int screen = DefaultScreen(display);
  72         Visual *visual = DefaultVisual(display, screen);
  73         Colormap colormap = DefaultColormap(display, screen);
  74
  75         int screen_width = DisplayWidth(display, screen);
  76         int screen_height = DisplayHeight(display, screen);
  77
  78         XftColor color;
  79
  80         XSetWindowAttributes attributes;
  81         attributes.override_redirect = True;
  82         XftColorAllocName(display, visual, colormap, background_color, &color);
  83         attributes.background_pixel = color.pixel;
  84         XftColorAllocName(display, visual, colormap, border_color, &color);
  85         attributes.border_pixel = color.pixel;
  86
  87         XftFont *font = XftFontOpenName(display, screen, font_pattern);
  88
  89         int num_of_lines = 0;
  90         int max_text_width = width - 2 * padding;
  91         // TODO replace hard-coded size 100
  92         char words[100][max_text_width / font->max_advance_width + 2];
  93
  94         for (int i = 1; i < argc; i++)
  95         {
  96                 char *body = argv[i];
  97
  98                 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))
  99                 {
 100                         strncpy(words[num_of_lines], body, eol);
 101                         words[num_of_lines][eol] = '\0';
 102                 }
 103         }
 104
 105         unsigned int x = pos_x;
 106         unsigned int y = pos_y;
 107         unsigned int text_height = font->ascent - font->descent;
 108         unsigned int height = (num_of_lines - 1) * line_spacing + num_of_lines * text_height + 2 * padding;
 109
 110         if (corner == TOP_RIGHT || corner == BOTTOM_RIGHT)
 111                 x = screen_width - width - border_size * 2 - pos_x;
 112
 113         if (corner == BOTTOM_LEFT || corner == BOTTOM_RIGHT)
 114                 y = screen_height - height - border_size * 2 - pos_y;
 115
 116         window = XCreateWindow(display, RootWindow(display, screen), x, y, width, height, border_size, DefaultDepth(display, screen), CopyFromParent, visual,
 117                                                    CWOverrideRedirect | CWBackPixel | CWBorderPixel, &attributes);
 118
 119         XftDraw *draw = XftDrawCreate(display, window, visual, colormap);
 120         XftColorAllocName(display, visual, colormap, font_color, &color);
 121
 122         XSelectInput(display, window, ExposureMask | ButtonPress);
 123
 124         XMapWindow(display, window);
 125
 126         XEvent event;
 127
 128         while (1)
 129         {
 130                 XNextEvent(display, &event);
 131
 132                 if (event.type == Expose)
 133                 {
 134                         XClearWindow(display, window);
 135                         for (int i = 0; i < num_of_lines; i++)
 136                                 XftDrawStringUtf8(draw, &color, font, padding, line_spacing * i + text_height * (i + 1) + padding, (FcChar8 *)words[i], strlen(words[i]));
 137                 }
 138                 if (event.type == ButtonPress)
 139                         break;
 140         }
 141
 142         XftDrawDestroy(draw);
 143         XftColorFree(display, visual, colormap, &color);
 144         XftFontClose(display, font);
 145
 146         XCloseDisplay(display);
 147         return EXIT_SUCCESS;
 148 }