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
   9 #include "config.h"
  10
  11 Display *display;
  12 Window window;
  13
  14 int get_max_len(char *body, XftFont *font, int max_text_width)
  15 {
  16         int body_len = strlen(body);
  17         XGlyphInfo info;
  18         XftTextExtentsUtf8(display, font, (FcChar8 *)body, body_len, &info);
  19
  20         if (info.width < max_text_width)
  21                 return body_len;
  22
  23         int eol = max_text_width / font->max_advance_width;
  24         info.width = 0;
  25
  26         while (info.width < max_text_width)
  27         {
  28                 eol++;
  29                 XftTextExtentsUtf8(display, font, (FcChar8 *)body, eol, &info);
  30         }
  31
  32         eol--;
  33
  34         int temp = eol;
  35
  36         while (body[eol] != ' ' && eol)
  37                 --eol;
  38
  39         if (eol == 0)
  40                 return temp;
  41         else
  42                 return ++eol;
  43 }
  44
  45 void expire()
  46 {
  47         XEvent event;
  48         event.type = ButtonPress;
  49         XSendEvent(display, window, 0, 0, &event);
  50         XFlush(display);
  51 }
  52
  53 int main(int argc, char *argv[])
  54 {
  55         if (argc == 1)
  56         {
  57                 fprintf(stderr, "Usage: herbe body\n");
  58                 exit(EXIT_FAILURE);
  59         }
  60
  61         signal(SIGALRM, expire);
  62         alarm(duration);
  63
  64         display = XOpenDisplay(0);
  65
  66         if (display == 0)
  67         {
  68                 fprintf(stderr, "Cannot open display\n");
  69                 exit(EXIT_FAILURE);
  70         }
  71
  72         int screen = DefaultScreen(display);
  73         Visual *visual = DefaultVisual(display, screen);
  74         Colormap colormap = DefaultColormap(display, screen);
  75
  76         int screen_width = DisplayWidth(display, screen);
  77         int screen_height = DisplayHeight(display, screen);
  78
  79         XftColor color;
  80
  81         XSetWindowAttributes attributes;
  82         attributes.override_redirect = True;
  83         XftColorAllocName(display, visual, colormap, background_color, &color);
  84         attributes.background_pixel = color.pixel;
  85         XftColorAllocName(display, visual, colormap, border_color, &color);
  86         attributes.border_pixel = color.pixel;
  87
  88         XftFont *font = XftFontOpenName(display, screen, font_pattern);
  89
  90         int num_of_lines = 0;
  91         int max_text_width = width - 2 * padding;
  92         // TODO replace hard-coded size 100
  93         char words[100][max_text_width / font->max_advance_width + 2];
  94
  95         for (int i = 1; i < argc; i++)
  96         {
  97                 char *body = argv[i];
  98
  99                 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))
 100                 {
 101                         strncpy(words[num_of_lines], body, eol);
 102                         words[num_of_lines][eol] = '\0';
 103                 }
 104         }
 105
 106         unsigned int x = pos_x;
 107         unsigned int y = pos_y;
 108         unsigned int text_height = font->ascent - font->descent;
 109         unsigned int height = (num_of_lines - 1) * line_spacing + num_of_lines * text_height + 2 * padding;
 110
 111         if (corner == TOP_RIGHT || corner == BOTTOM_RIGHT)
 112                 x = screen_width - width - border_size * 2 - pos_x;
 113
 114         if (corner == BOTTOM_LEFT || corner == BOTTOM_RIGHT)
 115                 y = screen_height - height - border_size * 2 - pos_y;
 116
 117         window = XCreateWindow(display, RootWindow(display, screen), x, y, width, height, border_size, DefaultDepth(display, screen), CopyFromParent, 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         while (1)
 128         {
 129                 XEvent event;
 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         XCloseDisplay(display);
 146
 147         return EXIT_SUCCESS;
 148 }