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Date:: Fri May 25 21:47:17 2018 UTC
Message:: Code alignment
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1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>    // strdup, strnlen, ...
4 #include <ctype.h>     // isalnum
5 #include <locale.h>    // setlocale
6 #include <unistd.h>
7 #include <sysexits.h>
8 #include <stdbool.h>
9 #include <limits.h>
10 #include <errno.h>
11 
12 #include <X11/Xlib.h>
13 #include <X11/Xutil.h> // XLookupString
14 #include <X11/Xresource.h>
15 #include <X11/Xcms.h>  // colors
16 #include <X11/keysym.h>
17 
18 #ifdef USE_XINERAMA
19 # include <X11/extensions/Xinerama.h>
20 #endif
21 
22 #ifdef USE_XFT
23 # include <X11/Xft/Xft.h>
24 #endif
25 
26 #define nil NULL
27 #define resname "MyMenu"
28 #define resclass "mymenu"
29 
30 #ifdef USE_XFT
31 # define default_fontname "monospace"
32 #else
33 # define default_fontname "fixed"
34 #endif
35 
36 #define MIN(a, b) ((a) < (b) ? (a) : (b))
37 #define MAX(a, b) ((a) > (b) ? (a) : (b))
38 
39 // If we don't have it or we don't want an "ignore case" completion
40 // style, fall back to `strstr(3)`
41 #ifndef USE_STRCASESTR
42 # define strcasestr strstr
43 #endif
44 
45 #define update_completions(cs, text, lines) {   \
46     compl_delete_rec(cs);                       \
47     cs = filter(text, lines);                   \
48   }
49 
50 #define complete(cs, nothing_selected, p, text, textlen, status) {      \
51     struct completions *n = p                                           \
52       ? compl_select_prev(cs, nothing_selected)                         \
53       : compl_select_next(cs, nothing_selected);                        \
54                                                                         \
55     if (n != nil) {                                                     \
56       nothing_selected = false;                                         \
57       free(text);                                                       \
58       text = strdup(n->completion);                                     \
59       if (text == nil) {                                                \
60         fprintf(stderr, "Memory allocation error!\n");                  \
61         status = ERR;                                                   \
62         break;                                                          \
63       }                                                                 \
64       textlen = strlen(text);                                           \
65     }                                                                   \
66   }
67 
68 #define INITIAL_ITEMS 64
69 
70 #define cannot_allocate_memory {                        \
71     fprintf(stderr, "Could not allocate memory\n");     \
72     abort();                                            \
73   }
74 
75 #define check_allocation(a) {     \
76     if (a == nil)                 \
77       cannot_allocate_memory;     \
78   }
79 
80 enum state {LOOPING, OK, ERR};
81 
82 enum text_type {PROMPT, COMPL, COMPL_HIGH};
83 
84 struct rendering {
85   Display *d;
86   Window w;
87   GC prompt;
88   GC prompt_bg;
89   GC completion;
90   GC completion_bg;
91   GC completion_highlighted;
92   GC completion_highlighted_bg;
93 #ifdef USE_XFT
94   XftDraw *xftdraw;
95   XftColor xft_prompt;
96   XftColor xft_completion;
97   XftColor xft_completion_highlighted;
98   XftFont *font;
99 #else
100   XFontSet *font;
101 #endif
102   int width;
103   int height;
104   bool horizontal_layout;
105   char *ps1;
106   int ps1len;
107 };
108 
109 struct completions {
110   char *completion;
111   bool selected;
112   struct completions *next;
113 };
114 
115 struct completions *compl_new() {
116   struct completions *c = malloc(sizeof(struct completions));
117 
118   if (c == nil)
119     return c;
120 
121   c->completion = nil;
122   c->selected = false;
123   c->next = nil;
124   return c;
125 }
126 
127 void compl_delete(struct completions *c) {
128   free(c);
129 }
130 
131 void compl_delete_rec(struct completions *c) {
132   while (c != nil) {
133     struct completions *t = c->next;
134     free(c);
135     c = t;
136   }
137 }
138 
139 struct completions *compl_select_next(struct completions *c, bool n) {
140   if (c == nil)
141     return nil;
142   if (n) {
143     c->selected = true;
144     return c;
145   }
146 
147   struct completions *orig = c;
148   while (c != nil) {
149     if (c->selected) {
150       c->selected = false;
151       if (c->next != nil) {
152         // the current one is selected and the next one exists
153         c->next->selected = true;
154         return c->next;
155       } else {
156         // the current one is selected and the next one is nill,
157         // select the first one
158         orig->selected = true;
159         return orig;
160       }
161     }
162     c = c->next;
163   }
164   return nil;
165 }
166 
167 struct completions *compl_select_prev(struct completions *c, bool n) {
168   if (c == nil)
169     return nil;
170 
171   struct completions *cc = c;
172 
173   if (n) // select the last one
174     while (cc != nil) {
175       if (cc->next == nil) {
176         cc->selected = true;
177         return cc;
178       }
179       cc = cc->next;
180     }
181   else // select the previous one
182     while (cc != nil) {
183       if (cc->next != nil && cc->next->selected) {
184         cc->next->selected = false;
185         cc->selected = true;
186         return cc;
187       }
188       cc = cc->next;
189     }
190 
191   return nil;
192 }
193 
194 struct completions *filter(char *text, char **lines) {
195   int i = 0;
196   struct completions *root = compl_new();
197   struct completions *c = root;
198   if (c == nil)
199     return nil;
200 
201   for (;;) {
202     char *l = lines[i];
203     if (l == nil)
204       break;
205 
206     if (strcasestr(l, text) != nil) {
207       c->next = compl_new();
208       c = c->next;
209       if (c == nil) {
210         compl_delete_rec(root);
211         return nil;
212       }
213       c->completion = l;
214     }
215 
216     ++i;
217   }
218 
219   struct completions *r = root->next;
220   compl_delete(root);
221   return r;
222 }
223 
224 // push the character c at the end of the string pointed by p
225 int pushc(char **p, int maxlen, char c) {
226   int len = strnlen(*p, maxlen);
227 
228   if (!(len < maxlen -2)) {
229     maxlen += maxlen >> 1;
230     char *newptr = realloc(*p, maxlen);
231     if (newptr == nil) { // bad!
232       return -1;
233     }
234     *p = newptr;
235   }
236 
237   (*p)[len] = c;
238   (*p)[len+1] = '\0';
239   return maxlen;
240 }
241 
242 int utf8strnlen(char *s, int maxlen) {
243   int len = 0;
244   while (*s && maxlen > 0) {
245     len += (*s++ & 0xc0) != 0x80;
246     maxlen--;
247   }
248   return len;
249 }
250 
251 // remove the last *glyph* from the *utf8* string!
252 // this is different from just setting the last byte to 0 (in some
253 // cases ofc). The actual implementation is quite inefficient because
254 // it remove the last char until the number of glyphs doesn't change
255 void popc(char *p, int maxlen) {
256   int len = strnlen(p, maxlen);
257 
258   if (len == 0)
259     return;
260 
261   int ulen = utf8strnlen(p, maxlen);
262   while (len > 0 && utf8strnlen(p, maxlen) == ulen) {
263     len--;
264     p[len] = 0;
265   }
266 }
267 
268 // If the string is surrounded by quotes (`"`) remove them and replace
269 // every `\"` in the string with `"`
270 char *normalize_str(const char *str) {
271   int len = strlen(str);
272   if (len == 0)
273     return nil;
274 
275   char *s = calloc(len, sizeof(char));
276   check_allocation(s);
277   int p = 0;
278   while (*str) {
279     char c = *str;
280     if (*str == '\\') {
281       if (*(str + 1)) {
282         s[p] = *(str + 1);
283         p++;
284         str += 2; // skip this and the next char
285         continue;
286       } else {
287         break;
288       }
289     }
290     if (c == '"') {
291       str++; // skip only this char
292       continue;
293     }
294     s[p] = c;
295     p++;
296     str++;
297   }
298   return s;
299 }
300 
301 // read an arbitrary long line from stdin and return a pointer to it
302 // TODO: resize the allocated memory to exactly fit the string once
303 // read?
304 char *readline(bool *eof) {
305   int maxlen = 8;
306   char *str = calloc(maxlen, sizeof(char));
307   if (str == nil) {
308     fprintf(stderr, "Cannot allocate memory!\n");
309     exit(EX_UNAVAILABLE);
310   }
311 
312   int c;
313   while((c = getchar()) != EOF) {
314     if (c == '\n')
315       return str;
316     else
317       maxlen = pushc(&str, maxlen, c);
318 
319     if (maxlen == -1) {
320       fprintf(stderr, "Cannot allocate memory!\n");
321       exit(EX_UNAVAILABLE);
322     }
323   }
324   *eof = true;
325   return str;
326 }
327 
328 int readlines (char ***lns, int items) {
329   bool finished = false;
330   int n = 0;
331   char **lines = *lns;
332   while (true) {
333     lines[n] = readline(&finished);
334 
335     if (strlen(lines[n]) == 0 || lines[n][0] == '\n') {
336       free(lines[n]);
337       --n; // forget about this line
338     }
339 
340     if (finished)
341       break;
342 
343     ++n;
344 
345     if (n == items - 1) {
346       items += items >>1;
347       char **l = realloc(lines, sizeof(char*) * items);
348       check_allocation(l);
349       *lns = l;
350       lines = l;
351     }
352   }
353 
354   n++;
355   lines[n] = nil;
356   return items;
357 }
358 
359 // Compute the dimension of the string str once rendered, return the
360 // width and save the width and the height in ret_width and ret_height
361 int text_extents(char *str, int len, struct rendering *r, int *ret_width, int *ret_height) {
362   int height;
363   int width;
364 #ifdef USE_XFT
365   XGlyphInfo gi;
366   XftTextExtentsUtf8(r->d, r->font, str, len, &gi);
367   // Honestly I don't know why this won't work, but I found that this
368   // formula seems to work with various ttf font
369   /* height = gi.height; */
370   height = (gi.height + (r->font->ascent - r->font->descent)/2) / 2;
371   width = gi.width - gi.x;
372 #else
373   XRectangle rect;
374   XmbTextExtents(*r->font, str, len, nil, &rect);
375   height = rect.height;
376   width = rect.width;
377 #endif
378   if (ret_width != nil)  *ret_width = width;
379   if (ret_height != nil) *ret_height = height;
380   return width;
381 }
382 
383 // Draw the string str
384 void draw_string(char *str, int len, int x, int y, struct rendering *r, enum text_type tt) {
385 #ifdef USE_XFT
386   XftColor xftcolor;
387   if (tt == PROMPT)     xftcolor = r->xft_prompt;
388   if (tt == COMPL)      xftcolor = r->xft_completion;
389   if (tt == COMPL_HIGH) xftcolor = r->xft_completion_highlighted;
390 
391   XftDrawStringUtf8(r->xftdraw, &xftcolor, r->font, x, y, str, len);
392 #else
393   GC gc;
394   if (tt == PROMPT)     gc = r->prompt;
395   if (tt == COMPL)      gc = r->completion;
396   if (tt == COMPL_HIGH) gc = r->completion_highlighted;
397   Xutf8DrawString(r->d, r->w, *r->font, gc, x, y, str, len);
398 #endif
399 }
400 
401 // Duplicate the string str and substitute every space with a 'n'
402 char *strdupn(char *str) {
403   int len = strlen(str);
404 
405   if (str == nil || len == 0)
406     return nil;
407 
408   char *dup = strdup(str);
409   if (dup == nil)
410     return nil;
411 
412   for (int i = 0; i < len; ++i)
413     if (dup[i] == ' ')
414       dup[i] = 'n';
415 
416   return dup;
417 }
418 
419 // |------------------|----------------------------------------------|
420 // | 20 char text     | completion | completion | completion | compl |
421 // |------------------|----------------------------------------------|
422 void draw_horizontally(struct rendering *r, char *text, struct completions *cs) {
423   // TODO: make these dynamic?
424   int prompt_width = 20; // char
425   int padding = 10;
426 
427   int width, height;
428   char *ps1_dup = strdupn(r->ps1);
429   ps1_dup = ps1_dup == nil ? r->ps1 : ps1_dup;
430   int ps1xlen = text_extents(ps1_dup, r->ps1len, r, &width, &height);
431   free(ps1_dup);
432   int start_at = ps1xlen;
433 
434   start_at = text_extents("n", 1, r, nil, nil);
435   start_at = start_at * prompt_width + padding;
436 
437   int texty = (height + r->height) >>1;
438 
439   XFillRectangle(r->d, r->w, r->prompt_bg, 0, 0, start_at, r->height);
440 
441   int text_len = strlen(text);
442   if (text_len > prompt_width)
443     text = text + (text_len - prompt_width);
444   draw_string(r->ps1, r->ps1len, padding, texty, r, PROMPT);
445   draw_string(text, MIN(text_len, prompt_width), padding + ps1xlen, texty, r, PROMPT);
446 
447   XFillRectangle(r->d, r->w, r->completion_bg, start_at, 0, r->width, r->height);
448 
449   while (cs != nil) {
450     enum text_type tt = cs->selected ? COMPL_HIGH : COMPL;
451     GC h = cs->selected ? r->completion_highlighted_bg : r->completion_bg;
452 
453     int len = strlen(cs->completion);
454     int text_width = text_extents(cs->completion, len, r, nil, nil);
455 
456     XFillRectangle(r->d, r->w, h, start_at, 0, text_width + padding*2, r->height);
457 
458     draw_string(cs->completion, len, start_at + padding, texty, r, tt);
459 
460     start_at += text_width + padding * 2;
461 
462     if (start_at > r->width)
463       break; // don't draw completion if the space isn't enough
464 
465     cs = cs->next;
466   }
467 
468   XFlush(r->d);
469 }
470 
471 // |-----------------------------------------------------------------|
472 // |  prompt                                                         |
473 // |-----------------------------------------------------------------|
474 // |  completion                                                     |
475 // |-----------------------------------------------------------------|
476 // |  completion                                                     |
477 // |-----------------------------------------------------------------|
478 // TODO: dunno why but in the call to Xutf8DrawString, by logic,
479 // should be padding and not padding*2, but the text doesn't seem to
480 // be vertically centered otherwise....
481 void draw_vertically(struct rendering *r, char *text, struct completions *cs) {
482   int padding = 10; // TODO make this dynamic
483 
484   int height, width;
485   text_extents("fjpgl", 5, r, &width, &height);
486   int start_at = height + padding*2;
487 
488   XFillRectangle(r->d, r->w, r->completion_bg, 0, 0, r->width, r->height);
489   XFillRectangle(r->d, r->w, r->prompt_bg, 0, 0, r->width, start_at);
490 
491   char *ps1_dup = strdupn(r->ps1);
492   ps1_dup = ps1_dup == nil ? r->ps1 : ps1_dup;
493   int ps1xlen = text_extents(ps1_dup, r->ps1len, r, nil, nil);
494   free(ps1_dup);
495 
496   draw_string(r->ps1, r->ps1len, padding, padding*2, r, PROMPT);
497   draw_string(text, strlen(text), padding + ps1xlen, padding*2, r, PROMPT);
498 
499   while (cs != nil) {
500     enum text_type tt = cs->selected ? COMPL_HIGH : COMPL;
501     GC h = cs->selected ? r->completion_highlighted_bg : r->completion_bg;
502 
503     int len = strlen(cs->completion);
504     text_extents(cs->completion, len, r, &width, &height);
505     XFillRectangle(r->d, r->w, h, 0, start_at, r->width, height + padding*2);
506     draw_string(cs->completion, len, padding, start_at + padding*2, r, tt);
507 
508     start_at += height + padding *2;
509 
510     if (start_at > r->height)
511       break; // don't draw completion if the space isn't enough
512 
513     cs = cs->next;
514   }
515 
516   XFlush(r->d);
517 }
518 
519 void draw(struct rendering *r, char *text, struct completions *cs) {
520   if (r->horizontal_layout)
521     draw_horizontally(r, text, cs);
522   else
523     draw_vertically(r, text, cs);
524 }
525 
526 /* Set some WM stuff */
527 void set_win_atoms_hints(Display *d, Window w, int width, int height) {
528   Atom type;
529   type = XInternAtom(d, "_NET_WM_WINDOW_TYPE_DOCK", false);
530   XChangeProperty(
531                   d,
532                   w,
533                   XInternAtom(d, "_NET_WM_WINDOW_TYPE", false),
534                   XInternAtom(d, "ATOM", false),
535                   32,
536                   PropModeReplace,
537                   (unsigned char *)&type,
538                   1
539                   );
540 
541   /* some window managers honor this properties */
542   type = XInternAtom(d, "_NET_WM_STATE_ABOVE", false);
543   XChangeProperty(d,
544                   w,
545                   XInternAtom(d, "_NET_WM_STATE", false),
546                   XInternAtom(d, "ATOM", false),
547                   32,
548                   PropModeReplace,
549                   (unsigned char *)&type,
550                   1
551                   );
552 
553   type = XInternAtom(d, "_NET_WM_STATE_FOCUSED", false);
554   XChangeProperty(d,
555                   w,
556                   XInternAtom(d, "_NET_WM_STATE", false),
557                   XInternAtom(d, "ATOM", false),
558                   32,
559                   PropModeAppend,
560                   (unsigned char *)&type,
561                   1
562                   );
563 
564   // setting window hints
565   XClassHint *class_hint = XAllocClassHint();
566   if (class_hint == nil) {
567     fprintf(stderr, "Could not allocate memory for class hint\n");
568     exit(EX_UNAVAILABLE);
569   }
570   class_hint->res_name = resname;
571   class_hint->res_class = resclass;
572   XSetClassHint(d, w, class_hint);
573   XFree(class_hint);
574 
575   XSizeHints *size_hint = XAllocSizeHints();
576   if (size_hint == nil) {
577     fprintf(stderr, "Could not allocate memory for size hint\n");
578     exit(EX_UNAVAILABLE);
579   }
580   size_hint->flags = PMinSize | PBaseSize;
581   size_hint->min_width = width;
582   size_hint->base_width = width;
583   size_hint->min_height = height;
584   size_hint->base_height = height;
585 
586   XFlush(d);
587 }
588 
589 void get_wh(Display *d, Window *w, int *width, int *height) {
590   XWindowAttributes win_attr;
591   XGetWindowAttributes(d, *w, &win_attr);
592   *height = win_attr.height;
593   *width = win_attr.width;
594 }
595 
596 // I know this may seem a little hackish BUT is the only way I managed
597 // to actually grab that goddam keyboard. Only one call to
598 // XGrabKeyboard does not always end up with the keyboard grabbed!
599 int take_keyboard(Display *d, Window w) {
600   int i;
601   for (i = 0; i < 100; i++) {
602     if (XGrabKeyboard(d, w, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
603       return 1;
604     usleep(1000);
605   }
606   return 0;
607 }
608 
609 void release_keyboard(Display *d) {
610   XUngrabKeyboard(d, CurrentTime);
611 }
612 
613 int parse_integer(const char *str, int default_value) {
614   /* int len = strlen(str); */
615   /* if (len > 0 && str[len-1] == '%') { */
616   /*   char *cpy = strdup(str); */
617   /*   check_allocation(cpy); */
618   /*   cpy[len-1] = '\0'; */
619   /*   int val = parse_integer(cpy, default_value, max); */
620   /*   free(cpy); */
621   /*   return val * max / 100; */
622   /* } */
623 
624   errno = 0;
625   char *ep;
626   long lval = strtol(str, &ep, 10);
627   if (str[0] == '\0' || *ep != '\0') { // NaN
628     fprintf(stderr, "'%s' is not a valid number! Using %d as default.\n", str, default_value);
629     return default_value;
630   }
631   if ((errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN)) ||
632       (lval > INT_MAX || lval < INT_MIN)) {
633     fprintf(stderr, "%s out of range! Using %d as default.\n", str, default_value);
634     return default_value;
635   }
636   return lval;
637 }
638 
639 int parse_int_with_percentage(const char *str, int default_value, int max) {
640   int len = strlen(str);
641   if (len > 0 && str[len-1] == '%') {
642     char *cpy = strdup(str);
643     check_allocation(cpy);
644     cpy[len-1] = '\0';
645     int val = parse_integer(cpy, default_value);
646     free(cpy);
647     return val * max / 100;
648   }
649   return parse_integer(str, default_value);
650 }
651 
652 int parse_int_with_middle(const char *str, int default_value, int max, int self) {
653   if (!strcmp(str, "middle")) {
654     return (max - self)/2;
655   }
656   return parse_int_with_percentage(str, default_value, max);
657 }
658 
659 int main() {
660   char **lines = calloc(INITIAL_ITEMS, sizeof(char*));
661   int nlines = readlines(&lines, INITIAL_ITEMS);
662 
663   setlocale(LC_ALL, getenv("LANG"));
664 
665   enum state status = LOOPING;
666 
667   // where the monitor start (used only with xinerama)
668   int offset_x = 0;
669   int offset_y = 0;
670 
671   // width and height of the window
672   int width = 400;
673   int height = 20;
674 
675   // position on the screen
676   int x = 0;
677   int y = 0;
678 
679   char *ps1 = strdup("$ ");
680   check_allocation(ps1);
681 
682   char *fontname = strdup(default_fontname);
683   check_allocation(fontname);
684 
685   int textlen = 10;
686   char *text = malloc(textlen * sizeof(char));
687   check_allocation(text);
688 
689   struct completions *cs = filter(text, lines);
690   bool nothing_selected = true;
691 
692   // start talking to xorg
693   Display *d = XOpenDisplay(nil);
694   if (d == nil) {
695     fprintf(stderr, "Could not open display!\n");
696     return EX_UNAVAILABLE;
697   }
698 
699   // get display size
700   // XXX: is getting the default root window dimension correct?
701   XWindowAttributes xwa;
702   XGetWindowAttributes(d, DefaultRootWindow(d), &xwa);
703   int d_width = xwa.width;
704   int d_height = xwa.height;
705 
706 #ifdef USE_XINERAMA
707   if (XineramaIsActive(d)) {
708     // find the mice
709     int number_of_screens = XScreenCount(d);
710     Window r;
711     Window root;
712     int root_x, root_y, win_x, win_y;
713     unsigned int mask;
714     bool res;
715     for (int i = 0; i < number_of_screens; ++i) {
716       root = XRootWindow(d, i);
717       res = XQueryPointer(d, root, &r, &r, &root_x, &root_y, &win_x, &win_y, &mask);
718       if (res) break;
719     }
720     if (!res) {
721       fprintf(stderr, "No mouse found.\n");
722       root_x = 0;
723       root_y = 0;
724     }
725 
726     // now find in which monitor the mice is on
727     int monitors;
728     XineramaScreenInfo *info = XineramaQueryScreens(d, &monitors);
729     if (info) {
730       for (int i = 0; i < monitors; ++i) {
731         if (info[i].x_org <= root_x && root_x <= (info[i].x_org + info[i].width)
732             && info[i].y_org <= root_y && root_y <= (info[i].y_org + info[i].height)) {
733           offset_x = info[i].x_org;
734           offset_y = info[i].y_org;
735           d_width = info[i].width;
736           d_height = info[i].height;
737           break;
738         }
739       }
740     }
741     XFree(info);
742   }
743 #endif
744 
745   Colormap cmap = DefaultColormap(d, DefaultScreen(d));
746   XColor p_fg, p_bg,
747     compl_fg, compl_bg,
748     compl_highlighted_fg, compl_highlighted_bg;
749 
750   bool horizontal_layout = true;
751 
752   // read resource
753   XrmInitialize();
754   char *xrm = XResourceManagerString(d);
755   XrmDatabase xdb = nil;
756   if (xrm != nil) {
757     xdb = XrmGetStringDatabase(xrm);
758     XrmValue value;
759     char *datatype[20];
760 
761     if (XrmGetResource(xdb, "MyMenu.font", "*", datatype, &value) == true) {
762       fontname = strdup(value.addr);
763       check_allocation(fontname);
764     }
765     else
766       fprintf(stderr, "no font defined, using %s\n", fontname);
767 
768     if (XrmGetResource(xdb, "MyMenu.layout", "*", datatype, &value) == true) {
769       char *v = strdup(value.addr);
770       check_allocation(v);
771       horizontal_layout = !strcmp(v, "horizontal");
772       free(v);
773     }
774     else
775       fprintf(stderr, "no layout defined, using horizontal\n");
776 
777     if (XrmGetResource(xdb, "MyMenu.prompt", "*", datatype, &value) == true) {
778       free(ps1);
779       ps1 = normalize_str(value.addr);
780     } else
781       fprintf(stderr, "no prompt defined, using \"%s\" as default\n", ps1);
782 
783     if (XrmGetResource(xdb, "MyMenu.width", "*", datatype, &value) == true)
784       width = parse_int_with_percentage(value.addr, width, d_width);
785     else
786       fprintf(stderr, "no width defined, using %d\n", width);
787 
788     if (XrmGetResource(xdb, "MyMenu.height", "*", datatype, &value) == true)
789       height = parse_int_with_percentage(value.addr, height, d_height);
790     else
791       fprintf(stderr, "no height defined, using %d\n", height);
792 
793     if (XrmGetResource(xdb, "MyMenu.x", "*", datatype, &value) == true)
794       x = parse_int_with_middle(value.addr, x, d_width, width);
795     else
796       fprintf(stderr, "no x defined, using %d\n", width);
797 
798     if (XrmGetResource(xdb, "MyMenu.y", "*", datatype, &value) == true)
799       y = parse_int_with_middle(value.addr, y, d_height, height);
800     else
801       fprintf(stderr, "no y defined, using %d\n", height);
802 
803     XColor tmp;
804     // TODO: tmp needs to be free'd after every allocation?
805 
806     // prompt
807     if (XrmGetResource(xdb, "MyMenu.prompt.foreground", "*", datatype, &value) == true)
808       XAllocNamedColor(d, cmap, value.addr, &p_fg, &tmp);
809     else
810       XAllocNamedColor(d, cmap, "white", &p_fg, &tmp);
811 
812     if (XrmGetResource(xdb, "MyMenu.prompt.background", "*", datatype, &value) == true)
813       XAllocNamedColor(d, cmap, value.addr, &p_bg, &tmp);
814     else
815       XAllocNamedColor(d, cmap, "black", &p_bg, &tmp);
816 
817     // completion
818     if (XrmGetResource(xdb, "MyMenu.completion.foreground", "*", datatype, &value) == true)
819       XAllocNamedColor(d, cmap, value.addr, &compl_fg, &tmp);
820     else
821       XAllocNamedColor(d, cmap, "white", &compl_fg, &tmp);
822 
823     if (XrmGetResource(xdb, "MyMenu.completion.background", "*", datatype, &value) == true)
824       XAllocNamedColor(d, cmap, value.addr, &compl_bg, &tmp);
825     else
826       XAllocNamedColor(d, cmap, "black", &compl_bg, &tmp);
827 
828     // completion highlighted
829     if (XrmGetResource(xdb, "MyMenu.completion_highlighted.foreground", "*", datatype, &value) == true)
830       XAllocNamedColor(d, cmap, value.addr, &compl_highlighted_fg, &tmp);
831     else
832       XAllocNamedColor(d, cmap, "black", &compl_highlighted_fg, &tmp);
833 
834     if (XrmGetResource(xdb, "MyMenu.completion_highlighted.background", "*", datatype, &value) == true)
835       XAllocNamedColor(d, cmap, value.addr, &compl_highlighted_bg, &tmp);
836     else
837       XAllocNamedColor(d, cmap, "white", &compl_highlighted_bg, &tmp);
838   } else {
839     XColor tmp;
840     XAllocNamedColor(d, cmap, "white", &p_fg, &tmp);
841     XAllocNamedColor(d, cmap, "black", &p_bg, &tmp);
842     XAllocNamedColor(d, cmap, "white", &compl_fg, &tmp);
843     XAllocNamedColor(d, cmap, "black", &compl_bg, &tmp);
844     XAllocNamedColor(d, cmap, "black", &compl_highlighted_fg, &tmp);
845     XAllocNamedColor(d, cmap, "white", &compl_highlighted_bg, &tmp);
846   }
847 
848   // load the font
849   /* XFontStruct *font = XLoadQueryFont(d, fontname); */
850   /* if (font == nil) { */
851   /*   fprintf(stderr, "Unable to load %s font\n", fontname); */
852   /*   font = XLoadQueryFont(d, "fixed"); */
853   /* } */
854   // load the font
855 #ifdef USE_XFT
856   XftFont *font = XftFontOpenName(d, DefaultScreen(d), fontname);
857 #else
858   char **missing_charset_list;
859   int missing_charset_count;
860   XFontSet font = XCreateFontSet(d, fontname, &missing_charset_list, &missing_charset_count, nil);
861   if (font == nil) {
862     fprintf(stderr, "Unable to load the font(s) %s\n", fontname);
863     return EX_UNAVAILABLE;
864   }
865 #endif
866 
867   // create the window
868   XSetWindowAttributes attr;
869   attr.override_redirect = true;
870 
871   Window w = XCreateWindow(d,                                   // display
872                            DefaultRootWindow(d),                // parent
873                            x + offset_x, y + offset_y,          // x y
874                            width, height,                       // w h
875                            0,                                   // border width
876                            DefaultDepth(d, DefaultScreen(d)),   // depth
877                            InputOutput,                         // class
878                            DefaultVisual(d, DefaultScreen(d)),  // visual
879                            CWOverrideRedirect,                  // value mask
880                            &attr);
881 
882   set_win_atoms_hints(d, w, width, height);
883 
884   // we want some events
885   XSelectInput(d, w, StructureNotifyMask | KeyPressMask | KeymapStateMask);
886 
887   // make the window appear on the screen
888   XMapWindow(d, w);
889 
890   // wait for the MapNotify event (i.e. the event "window rendered")
891   for (;;) {
892     XEvent e;
893     XNextEvent(d, &e);
894     if (e.type == MapNotify)
895       break;
896   }
897 
898   // get the *real* width & height after the window was rendered
899   get_wh(d, &w, &width, &height);
900 
901   // grab keyboard
902   take_keyboard(d, w);
903 
904   // Create some graphics contexts
905   XGCValues values;
906   /* values.font = font->fid; */
907 
908   struct rendering r = {
909     .d                          = d,
910     .w                          = w,
911 #ifdef USE_XFT
912     .font                       = font,
913 #else
914     .font                       = &font,
915 #endif
916     .prompt                     = XCreateGC(d, w, 0, &values),
917     .prompt_bg                  = XCreateGC(d, w, 0, &values),
918     .completion                 = XCreateGC(d, w, 0, &values),
919     .completion_bg              = XCreateGC(d, w, 0, &values),
920     .completion_highlighted     = XCreateGC(d, w, 0, &values),
921     .completion_highlighted_bg  = XCreateGC(d, w, 0, &values),
922     .width                      = width,
923     .height                     = height,
924     .horizontal_layout          = horizontal_layout,
925     .ps1                        = ps1,
926     .ps1len                     = strlen(ps1)
927   };
928 
929 #ifdef USE_XFT
930   r.xftdraw = XftDrawCreate(d, w, DefaultVisual(d, 0), DefaultColormap(d, 0));
931 
932   // prompt
933   XRenderColor xrcolor;
934   xrcolor.red          = p_fg.red;
935   xrcolor.green        = p_fg.red;
936   xrcolor.blue         = p_fg.red;
937   xrcolor.alpha        = 65535;
938   XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_prompt);
939 
940   // completion
941   xrcolor.red          = compl_fg.red;
942   xrcolor.green        = compl_fg.green;
943   xrcolor.blue         = compl_fg.blue;
944   xrcolor.alpha        = 65535;
945   XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_completion);
946 
947   // completion highlighted
948   xrcolor.red          = compl_highlighted_fg.red;
949   xrcolor.green        = compl_highlighted_fg.green;
950   xrcolor.blue         = compl_highlighted_fg.blue;
951   xrcolor.alpha        = 65535;
952   XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_completion_highlighted);
953 #endif
954 
955   // load the colors in our GCs
956   XSetForeground(d, r.prompt, p_fg.pixel);
957   XSetForeground(d, r.prompt_bg, p_bg.pixel);
958   XSetForeground(d, r.completion, compl_fg.pixel);
959   XSetForeground(d, r.completion_bg, compl_bg.pixel);
960   XSetForeground(d, r.completion_highlighted, compl_highlighted_fg.pixel);
961   XSetForeground(d, r.completion_highlighted_bg, compl_highlighted_bg.pixel);
962 
963   // open the X input method
964   XIM xim = XOpenIM(d, xdb, resname, resclass);
965   check_allocation(xim);
966 
967   XIMStyles *xis = nil;
968   if (XGetIMValues(xim, XNQueryInputStyle, &xis, NULL) || !xis) {
969     fprintf(stderr, "Input Styles could not be retrieved\n");
970     return EX_UNAVAILABLE;
971   }
972 
973   XIMStyle bestMatchStyle = 0;
974   for (int i = 0; i < xis->count_styles; ++i) {
975     XIMStyle ts = xis->supported_styles[i];
976     if (ts == (XIMPreeditNothing | XIMStatusNothing)) {
977       bestMatchStyle = ts;
978       break;
979     }
980   }
981   XFree(xis);
982 
983   if (!bestMatchStyle) {
984     fprintf(stderr, "No matching input style could be determined\n");
985   }
986 
987   XIC xic = XCreateIC(xim, XNInputStyle, bestMatchStyle, XNClientWindow, w, XNFocusWindow, w, NULL);
988   check_allocation(xic);
989 
990   // draw the window for the first time
991   draw(&r, text, cs);
992 
993   // main loop
994   while (status == LOOPING) {
995     XEvent e;
996     XNextEvent(d, &e);
997 
998     if (XFilterEvent(&e, w))
999       continue;
1000 
1001     switch (e.type) {
1002     case KeymapNotify:
1003       XRefreshKeyboardMapping(&e.xmapping);
1004       break;
1005 
1006     case KeyPress: {
1007       XKeyPressedEvent *ev = (XKeyPressedEvent*)&e;
1008 
1009       if (ev->keycode == XKeysymToKeycode(d, XK_Tab)) {
1010         bool shift = (ev->state & ShiftMask);
1011         complete(cs, nothing_selected, shift, text, textlen, status);
1012         draw(&r, text, cs);
1013         break;
1014       }
1015 
1016       if (ev->keycode == XKeysymToKeycode(d, XK_BackSpace)) {
1017         nothing_selected = true;
1018         popc(text, textlen);
1019         update_completions(cs, text, lines);
1020         draw(&r, text, cs);
1021         break;
1022       }
1023 
1024       if (ev->keycode == XKeysymToKeycode(d, XK_Return)) {
1025         status = OK;
1026         break;
1027       }
1028 
1029       if (ev->keycode == XKeysymToKeycode(d, XK_Escape)) {
1030         status = ERR;
1031         break;
1032       }
1033 
1034       // try to read what the user pressed
1035       int symbol = 0;
1036       Status s = 0;
1037       Xutf8LookupString(xic, ev, (char*)&symbol, 4, 0, &s);
1038 
1039       if (s == XBufferOverflow) {
1040         // should not happen since there are no utf-8 characters
1041         // larger than 24bits, but is something to be aware of when
1042         // used to directly write to a string buffer
1043         fprintf(stderr, "Buffer overflow when trying to create keyboard symbol map.\n");
1044         break;
1045       }
1046       char *str = (char*)&symbol;
1047 
1048       if (ev->state & ControlMask) {
1049         // check for some key bindings
1050         if (!strcmp(str, "")) { // C-u
1051           nothing_selected = true;
1052           for (int i = 0; i < textlen; ++i)
1053             text[i] = 0;
1054           update_completions(cs, text, lines);
1055         }
1056         if (!strcmp(str, "")) { // C-h
1057           nothing_selected = true;
1058           popc(text, textlen);
1059           update_completions(cs, text, lines);
1060         }
1061         if (!strcmp(str, "")) { // C-w
1062           nothing_selected = true;
1063 
1064           // `textlen` is the length of the allocated string, not the
1065           // length of the ACTUAL string
1066           int p = strlen(text) - 1;
1067           if (p >= 0) { // delete the current char
1068             text[p] = 0;
1069             p--;
1070           }
1071           while (p >= 0 && isalnum(text[p])) {
1072             text[p] = 0;
1073             p--;
1074           }
1075           // erase also trailing white space
1076           while (p >= 0 && isspace(text[p])) {
1077             text[p] = 0;
1078             p--;
1079           }
1080           update_completions(cs, text, lines);
1081         }
1082         if (!strcmp(str, "\r")) { // C-m
1083           status = OK;
1084         }
1085         if (!strcmp(str, "")) {
1086           complete(cs, nothing_selected, true, text, textlen, status);
1087         }
1088         if (!strcmp(str, "")) {
1089           complete(cs, nothing_selected, false, text, textlen, status);
1090         }
1091         draw(&r, text, cs);
1092         break;
1093       }
1094 
1095       int str_len = strlen(str);
1096       for (int i = 0; i < str_len; ++i) {
1097         textlen = pushc(&text, textlen, str[i]);
1098         if (textlen == -1) {
1099           fprintf(stderr, "Memory allocation error\n");
1100           status = ERR;
1101           break;
1102         }
1103         nothing_selected = true;
1104         update_completions(cs, text, lines);
1105       }
1106 
1107     }
1108       draw(&r, text, cs);
1109       break;
1110 
1111     default:
1112       fprintf(stderr, "Unknown event %d\n", e.type);
1113     }
1114   }
1115 
1116   release_keyboard(d);
1117 
1118   if (status == OK)
1119     printf("%s\n", text);
1120 
1121   for (int i = 0; i < nlines; ++i) {
1122     free(lines[i]);
1123   }
1124 
1125 #ifdef USE_XFT
1126     XftColorFree(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &r.xft_prompt);
1127     XftColorFree(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &r.xft_completion);
1128     XftColorFree(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &r.xft_completion_highlighted);
1129 #endif
1130 
1131   free(ps1);
1132   free(fontname);
1133   free(text);
1134   free(lines);
1135   compl_delete(cs);
1136 
1137   XDestroyWindow(d, w);
1138   XCloseDisplay(d);
1139 
1140   return status == OK ? 0 : 1;
1141 }