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Date:: Mon May 21 09:19:18 2018 UTC
Message:: Added optional Xft(3) support + documentation
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1 /* mymenu -- simple dmenu alternative */
2 
3 /* Copyright (C) 2018  Omar Polo <omar.polo@europecom.net>
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, either version 3 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
17  */
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>    // strdup, strnlen, ...
22 #include <ctype.h>     // isalnum
23 #include <locale.h>    // setlocale
24 #include <unistd.h>
25 #include <sysexits.h>
26 #include <stdbool.h>
27 #include <limits.h>
28 #include <errno.h>
29 
30 #include <X11/Xlib.h>
31 #include <X11/Xutil.h> // XLookupString
32 #include <X11/Xresource.h>
33 #include <X11/Xcms.h>  // colors
34 #include <X11/keysym.h>
35 
36 #ifdef USE_XINERAMA
37 # include <X11/extensions/Xinerama.h>
38 #endif
39 
40 #ifdef USE_XFT
41 # include <X11/Xft/Xft.h>
42 #endif
43 
44 #define nil NULL
45 #define resname "MyMenu"
46 #define resclass "mymenu"
47 
48 #define MIN(X, Y) (((X) < (Y)) ? (X) : (Y))
49 #define MAX(a, b) ((a) > (b) ? (a) : (b))
50 #define OVERLAP(a,b,c,d) (((a)==(c) && (b)==(d)) || MIN((a)+(b), (c)+(d)) - MAX((a), (c)) > 0)
51 #define INTERSECT(x,y,w,h,x1,y1,w1,h1) (OVERLAP((x),(w),(x1),(w1)) && OVERLAP((y),(h),(y1),(h1)))
52 
53 #define update_completions(cs, text, lines) {   \
54     compl_delete(cs);                           \
55     cs = filter(text, lines);                   \
56   }
57 
58 // TODO: dynamic?
59 #define INITIAL_ITEMS 64
60 
61 #define TODO(s) {                               \
62     fprintf(stderr, "TODO! " s "\n");           \
63   }
64 
65 #define cannot_allocate_memory {                        \
66     fprintf(stderr, "Could not allocate memory\n");     \
67     exit(EX_UNAVAILABLE);                               \
68   }
69 
70 #define check_allocation(a) {     \
71     if (a == nil)                 \
72       cannot_allocate_memory;     \
73   }
74 
75 enum state {LOOPING, OK, ERR};
76 
77 enum text_type {PROMPT, COMPL, COMPL_HIGH};
78 
79 struct rendering {
80   Display *d;
81   Window w;
82   GC prompt;
83   GC prompt_bg;
84   GC completion;
85   GC completion_bg;
86   GC completion_highlighted;
87   GC completion_highlighted_bg;
88 #ifdef USE_XFT
89   XftDraw *xftdraw;
90   XftColor xft_prompt;
91   XftColor xft_completion;
92   XftColor xft_completion_highlighted;
93   XftFont *font;
94 #else
95   XFontSet *font;
96 #endif
97   int width;
98   int height;
99   bool horizontal_layout;
100   char *ps1;
101   int ps1len;
102 };
103 
104 struct completions {
105   char *completion;
106   bool selected;
107   struct completions *next;
108 };
109 
110 struct completions *compl_new() {
111   struct completions *c = malloc(sizeof(struct completions));
112 
113   if (c == nil)
114     return c;
115 
116   c->completion = nil;
117   c->selected = false;
118   c->next = nil;
119   return c;
120 }
121 
122 void compl_delete(struct completions *c) {
123   free(c);
124 }
125 
126 struct completions *compl_select_next(struct completions *c, bool n) {
127   if (c == nil)
128     return nil;
129   if (n) {
130     c->selected = true;
131     return c;
132   }
133 
134   struct completions *orig = c;
135   while (c != nil) {
136     if (c->selected) {
137       c->selected = false;
138       if (c->next != nil) {
139         // the current one is selected and the next one exists
140         c->next->selected = true;
141         return c->next;
142       } else {
143         // the current one is selected and the next one is nill,
144         // select the first one
145         orig->selected = true;
146         return orig;
147       }
148     }
149     c = c->next;
150   }
151   return nil;
152 }
153 
154 struct completions *compl_select_prev(struct completions *c, bool n) {
155   if (c == nil)
156     return nil;
157 
158   struct completions *cc = c;
159 
160   if (n) // select the last one
161     while (cc != nil) {
162       if (cc->next == nil) {
163         cc->selected = true;
164         return cc;
165       }
166       cc = cc->next;
167     }
168   else // select the previous one
169     while (cc != nil) {
170       if (cc->next != nil && cc->next->selected) {
171         cc->next->selected = false;
172         cc->selected = true;
173         return cc;
174       }
175       cc = cc->next;
176     }
177   
178   return nil;
179 }
180 
181 struct completions *filter(char *text, char **lines) {
182   int i = 0;
183   struct completions *root = compl_new();
184   struct completions *c = root;
185 
186   for (;;) {
187     char *l = lines[i];
188     if (l == nil)
189       break;
190 
191     if (strstr(l, text) != nil) {
192       c->next = compl_new();
193       c = c->next;
194       c->completion = l;
195     }
196 
197     ++i;
198   }
199 
200   struct completions *r = root->next;
201   compl_delete(root);
202   return r;
203 }
204 
205 // push the character c at the end of the string pointed by p
206 int pushc(char **p, int maxlen, char c) {
207   int len = strnlen(*p, maxlen);
208 
209   if (!(len < maxlen -2)) {
210     maxlen += maxlen >> 1;
211     char *newptr = realloc(*p, maxlen);
212     if (newptr == nil) { // bad!
213       return -1;
214     }
215     *p = newptr;
216   }
217 
218   (*p)[len] = c;
219   (*p)[len+1] = '\0';
220   return maxlen;
221 }
222 
223 int utf8strnlen(char *s, int maxlen) {
224   int len = 0;
225   while (*s && maxlen > 0) {
226     len += (*s++ & 0xc0) != 0x80;
227     maxlen--;
228   }
229   return len;
230 }
231 
232 // remove the last *glyph* from the *utf8* string!
233 // this is different from just setting the last byte to 0 (in some
234 // cases ofc). The actual implementation is quite inefficient because
235 // it remove the last char until the number of glyphs doesn't change
236 void popc(char *p, int maxlen) {
237   int len = strnlen(p, maxlen);
238 
239   if (len == 0)
240     return;
241 
242   int ulen = utf8strnlen(p, maxlen);
243   while (len > 0 && utf8strnlen(p, maxlen) == ulen) {
244     len--;
245     p[len] = 0;
246   }
247 }
248 
249 // If the string is surrounded by quotes (`"`) remove them and replace
250 // every `\"` in the string with `"`
251 char *normalize_str(const char *str) {
252   int len = strlen(str);
253   if (len == 0)
254     return nil;
255 
256   char *s = calloc(len, sizeof(char));
257   check_allocation(s);
258   int p = 0;
259   while (*str) {
260     char c = *str;
261     if (*str == '\\') {
262       if (*(str + 1)) {
263         s[p] = *(str + 1);
264         p++;
265         str += 2; // skip this and the next char
266         continue;
267       } else {
268         break;
269       }
270     }
271     if (c == '"') {
272       str++; // skip only this char
273       continue;
274     }
275     s[p] = c;
276     p++;
277     str++;
278   }
279   return s;
280 }
281 
282 // read an arbitrary long line from stdin and return a pointer to it
283 // TODO: resize the allocated memory to exactly fit the string once
284 // read?
285 char *readline(bool *eof) {
286   int maxlen = 8;
287   char *str = calloc(maxlen, sizeof(char));
288   if (str == nil) {
289     fprintf(stderr, "Cannot allocate memory!\n");
290     exit(EX_UNAVAILABLE);
291   }
292 
293   int c;
294   while((c = getchar()) != EOF) {
295     if (c == '\n')
296       return str;
297     else
298       maxlen = pushc(&str, maxlen, c);
299 
300     if (maxlen == -1) {
301       fprintf(stderr, "Cannot allocate memory!\n");
302       exit(EX_UNAVAILABLE);
303     }
304   }
305   *eof = true;
306   return str;
307 }
308 
309 int readlines (char ***lns, int items) {
310   bool finished = false;
311   int n = 0;
312   char **lines = *lns;
313   while (true) {
314     lines[n] = readline(&finished);
315 
316     if (strlen(lines[n]) == 0 || lines[n][0] == '\n') {
317       free(lines[n]);
318       --n; // forget about this line
319     }
320 
321     if (finished)
322       break;
323 
324     ++n;
325 
326     if (n == items - 1) {
327       items += items >>1;
328       char **l = realloc(lines, sizeof(char*) * items);
329       check_allocation(l);
330       *lns = l;
331       lines = l;
332     }
333   }
334 
335   n++;
336   lines[n] = nil;
337   return items;
338 }
339 
340 int text_extents(char *str, int len, struct rendering *r, int *ret_width, int *ret_height) {
341   int height;
342   int width;
343 #ifdef USE_XFT
344   XGlyphInfo gi;
345   XftTextExtentsUtf8(r->d, r->font, str, len, &gi);
346   height = (r->font->ascent - r->font->descent)/2;
347   width = gi.width - gi.x;
348 #else
349   XRectangle rect;
350   XmbTextExtents(*r->font, str, len, nil, &rect);
351   height = rect.height;
352   width = rect.width;
353 #endif
354   if (ret_width != nil)  *ret_width = width;
355   if (ret_height != nil) *ret_height = height;
356   return width;
357 }
358 
359 void draw_string(char *str, int len, int x, int y, struct rendering *r, enum text_type tt) {
360 #ifdef USE_XFT
361   XftColor xftcolor;
362   if (tt == PROMPT)     xftcolor = r->xft_prompt;
363   if (tt == COMPL)      xftcolor = r->xft_completion;
364   if (tt == COMPL_HIGH) xftcolor = r->xft_completion_highlighted;
365 
366   XftDrawStringUtf8(r->xftdraw, &xftcolor, r->font, x, y, str, len);
367 #else
368   GC gc;
369   if (tt == PROMPT)     gc = r->prompt;
370   if (tt == COMPL)      gc = r->completion;
371   if (tt == COMPL_HIGH) gc = r->completion_highlighted;
372   Xutf8DrawString(r->d, r->w, *r->font, gc, x, y, str, len);
373 #endif
374 }
375 
376 char *strdupn(char *str) {
377   int len = strlen(str);
378 
379   if (str == nil || len == 0)
380     return nil;
381 
382   char *dup = strdup(str);
383   if (dup == nil)
384     return nil;
385 
386   for (int i = 0; i < len; ++i)
387     if (dup[i] == ' ')
388       dup[i] = 'n';
389 
390   return dup;
391 }
392 
393 // |------------------|----------------------------------------------|
394 // | 20 char text     | completion | completion | completion | compl |
395 // |------------------|----------------------------------------------|
396 void draw_horizontally(struct rendering *r, char *text, struct completions *cs) {
397   // TODO: make these dynamic?
398   int prompt_width = 20; // char
399   int padding = 10;
400 
401   int width, height;
402   char *ps1_dup = strdupn(r->ps1);
403   ps1_dup = ps1_dup == nil ? r->ps1 : ps1_dup;
404   int ps1xlen = text_extents(ps1_dup, r->ps1len, r, &width, &height);
405   free(ps1_dup);
406   int start_at = ps1xlen;
407 
408   start_at = text_extents("n", 1, r, nil, nil);
409   start_at = start_at * prompt_width + padding;
410 
411   int texty = (height + r->height) >>1;
412 
413   XFillRectangle(r->d, r->w, r->prompt_bg, 0, 0, start_at, r->height);
414 
415   int text_len = strlen(text);
416   if (text_len > prompt_width)
417     text = text + (text_len - prompt_width);
418   draw_string(r->ps1, r->ps1len, padding, texty, r, PROMPT);
419   draw_string(text, MIN(text_len, prompt_width), padding + ps1xlen, texty, r, PROMPT);
420 
421   XFillRectangle(r->d, r->w, r->completion_bg, start_at, 0, r->width, r->height);
422 
423   while (cs != nil) {
424     enum text_type tt = cs->selected ? COMPL_HIGH : COMPL;
425     GC h = cs->selected ? r->completion_highlighted_bg : r->completion_bg;
426 
427     int len = strlen(cs->completion);
428     int text_width = text_extents(cs->completion, len, r, nil, nil);
429 
430     XFillRectangle(r->d, r->w, h, start_at, 0, text_width + padding*2, r->height);
431 
432     draw_string(cs->completion, len, start_at + padding, texty, r, tt);
433 
434     start_at += text_width + padding * 2;
435 
436     if (start_at > r->width)
437       break; // don't draw completion if the space isn't enough
438 
439     cs = cs->next;
440   }
441 
442   XFlush(r->d);
443 }
444 
445 // |-----------------------------------------------------------------|
446 // |  prompt                                                         |
447 // |-----------------------------------------------------------------|
448 // |  completion                                                     |
449 // |-----------------------------------------------------------------|
450 // |  completion                                                     |
451 // |-----------------------------------------------------------------|
452 // TODO: dunno why but in the call to Xutf8DrawString, by logic,
453 // should be padding and not padding*2, but the text doesn't seem to
454 // be vertically centered otherwise....
455 void draw_vertically(struct rendering *r, char *text, struct completions *cs) {
456   int padding = 10; // TODO make this dynamic
457 
458   int height, width;
459   text_extents("fjpgl", 5, r, &width, &height);
460   int start_at = height + padding*2;
461 
462   XFillRectangle(r->d, r->w, r->completion_bg, 0, 0, r->width, r->height);
463   XFillRectangle(r->d, r->w, r->prompt_bg, 0, 0, r->width, start_at);
464 
465   char *ps1_dup = strdupn(r->ps1);
466   ps1_dup = ps1_dup == nil ? r->ps1 : ps1_dup;
467   int ps1xlen = text_extents(ps1_dup, r->ps1len, r, nil, nil);
468   free(ps1_dup);
469 
470   draw_string(r->ps1, r->ps1len, padding, padding*2, r, PROMPT);
471   draw_string(text, strlen(text), padding + ps1xlen, padding*2, r, PROMPT);
472 
473   while (cs != nil) {
474     enum text_type tt = cs->selected ? COMPL_HIGH : COMPL;
475     GC h = cs->selected ? r->completion_highlighted_bg : r->completion_bg;
476 
477     int len = strlen(cs->completion);
478     text_extents(cs->completion, len, r, &width, &height);
479     XFillRectangle(r->d, r->w, h, 0, start_at, r->width, height + padding*2);
480     draw_string(cs->completion, len, padding, start_at + padding*2, r, tt);
481 
482     start_at += height + padding *2;
483 
484     if (start_at > r->height)
485       break; // don't draw completion if the space isn't enough
486 
487     cs = cs->next;
488   }
489 
490   XFlush(r->d);
491 }
492 
493 void draw(struct rendering *r, char *text, struct completions *cs) {
494   if (r->horizontal_layout)
495     draw_horizontally(r, text, cs);
496   else
497     draw_vertically(r, text, cs);
498 }
499 
500 /* Set some WM stuff */
501 void set_win_atoms_hints(Display *d, Window w, int width, int height) {
502   Atom type;
503   type = XInternAtom(d, "_NET_WM_WINDOW_TYPE_DOCK", false);
504   XChangeProperty(
505                   d,
506                   w,
507                   XInternAtom(d, "_NET_WM_WINDOW_TYPE", false),
508                   XInternAtom(d, "ATOM", false),
509                   32,
510                   PropModeReplace,
511                   (unsigned char *)&type,
512                   1
513                   );
514 
515   /* some window managers honor this properties */
516   type = XInternAtom(d, "_NET_WM_STATE_ABOVE", false);
517   XChangeProperty(d,
518                   w,
519                   XInternAtom(d, "_NET_WM_STATE", false),
520                   XInternAtom(d, "ATOM", false),
521                   32,
522                   PropModeReplace,
523                   (unsigned char *)&type,
524                   1
525                   );
526 
527   type = XInternAtom(d, "_NET_WM_STATE_FOCUSED", false);
528   XChangeProperty(d,
529                   w,
530                   XInternAtom(d, "_NET_WM_STATE", false),
531                   XInternAtom(d, "ATOM", false),
532                   32,
533                   PropModeAppend,
534                   (unsigned char *)&type,
535                   1
536                   );
537 
538   // setting window hints
539   XClassHint *class_hint = XAllocClassHint();
540   if (class_hint == nil) {
541     fprintf(stderr, "Could not allocate memory for class hint\n");
542     exit(EX_UNAVAILABLE);
543   }
544   class_hint->res_name = "mymenu";
545   class_hint->res_class = "mymenu";
546   XSetClassHint(d, w, class_hint);
547   XFree(class_hint);
548 
549   XSizeHints *size_hint = XAllocSizeHints();
550   if (size_hint == nil) {
551     fprintf(stderr, "Could not allocate memory for size hint\n");
552     exit(EX_UNAVAILABLE);
553   }
554   size_hint->min_width = width;
555   size_hint->base_width = width;
556   size_hint->min_height = height;
557   size_hint->base_height = height;
558 
559   XFlush(d);
560 }
561 
562 void get_wh(Display *d, Window *w, int *width, int *height) {
563   XWindowAttributes win_attr;
564   XGetWindowAttributes(d, *w, &win_attr);
565   *height = win_attr.height;
566   *width = win_attr.width;
567 }
568 
569 // I know this may seem a little hackish BUT is the only way I managed
570 // to actually grab that goddam keyboard. Only one call to
571 // XGrabKeyboard does not always end up with the keyboard grabbed!
572 int take_keyboard(Display *d, Window w) {
573   int i;
574   for (i = 0; i < 100; i++) {
575     if (XGrabKeyboard(d, w, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
576       return 1;
577     usleep(1000);
578   }
579   return 0;
580 }
581 
582 void release_keyboard(Display *d) {
583   XUngrabKeyboard(d, CurrentTime);
584 }
585 
586 int parse_integer(const char *str, int default_value, int max) {
587   int len = strlen(str);
588   if (len > 0 && str[len-1] == '%') {
589     char *cpy = strdup(str);
590     check_allocation(cpy);
591     cpy[len-1] = '\0';
592     int val = parse_integer(cpy, default_value, max);
593     free(cpy);
594     return val * max / 100;
595   }
596 
597   errno = 0;
598   char *ep;
599   long lval = strtol(str, &ep, 10);
600   if (str[0] == '\0' || *ep != '\0') { // NaN
601     fprintf(stderr, "'%s' is not a valid number! Using %d as default.\n", str, default_value);
602     return default_value;
603   }
604   if ((errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN)) ||
605       (lval > INT_MAX || lval < INT_MIN)) {
606     fprintf(stderr, "%s out of range! Using %d as default.\n", str, default_value);
607     return default_value;
608   }
609   return lval;
610 }
611 
612 int parse_int_with_middle(const char *str, int default_value, int max, int self) {
613   if (!strcmp(str, "middle")) {
614     return (max - self)/2;
615   }
616   return parse_integer(str, default_value, max);
617 }
618 
619 int main() {
620   char **lines = calloc(INITIAL_ITEMS, sizeof(char*));
621   int nlines = readlines(&lines, INITIAL_ITEMS);
622 
623   setlocale(LC_ALL, getenv("LANG"));
624 
625   enum state status = LOOPING;
626 
627   // where the monitor start (used only with xinerama)
628   int offset_x = 0;
629   int offset_y = 0;
630 
631   // width and height of the window
632   int width = 400;
633   int height = 20;
634 
635   // position on the screen
636   int x = 0;
637   int y = 0;
638 
639   char *ps1 = strdup("$ ");
640   check_allocation(ps1);
641 
642   char *fontname = strdup("fixed");
643   check_allocation(fontname);
644 
645   int textlen = 10;
646   char *text = malloc(textlen * sizeof(char));
647   check_allocation(text);
648 
649   struct completions *cs = filter(text, lines);
650   bool nothing_selected = true;
651 
652   // start talking to xorg
653   Display *d = XOpenDisplay(nil);
654   if (d == nil) {
655     fprintf(stderr, "Could not open display!\n");
656     return EX_UNAVAILABLE;
657   }
658 
659   // get display size
660   // XXX: is getting the default root window dimension correct?
661   XWindowAttributes xwa;
662   XGetWindowAttributes(d, DefaultRootWindow(d), &xwa);
663   int d_width = xwa.width;
664   int d_height = xwa.height;
665 
666 #ifdef USE_XINERAMA
667   // TODO: this bit still needs to be improved
668   if (XineramaIsActive(d)) {
669     int monitors;
670     XineramaScreenInfo *info = XineramaQueryScreens(d, &monitors);
671     if (info)
672       for (int i = 0; i < monitors; ++i) {
673         if (INTERSECT(x, y, 1, 1, info[i].x_org, info[i].y_org, info[i].width, info[i].height)) {
674           offset_x = info[x].x_org;
675           offset_y = info[y].y_org;
676           d_width = info[i].width;
677           d_height = info[i].height;
678         }
679       }
680     XFree(info);
681   }
682 #endif
683 
684   /* fprintf(stderr, "offset_x:\t%d\n" */
685   /*                 "offset_y:\t%d\n" */
686   /*                 "d_width:\t%d\n" */
687   /*                 "d_height:\t%d\n" */
688   /*         , offset_x, offset_y, d_width, d_height); */
689 
690   Colormap cmap = DefaultColormap(d, DefaultScreen(d));
691   XColor p_fg, p_bg,
692     compl_fg, compl_bg,
693     compl_highlighted_fg, compl_highlighted_bg;
694 
695   bool horizontal_layout = true;
696 
697   // read resource
698   XrmInitialize();
699   char *xrm = XResourceManagerString(d);
700   XrmDatabase xdb = nil;
701   if (xrm != nil) {
702     xdb = XrmGetStringDatabase(xrm);
703     XrmValue value;
704     char *datatype[20];
705 
706     if (XrmGetResource(xdb, "MyMenu.font", "*", datatype, &value) == true) {
707       fontname = strdup(value.addr);
708       check_allocation(fontname);
709     }
710     else
711       fprintf(stderr, "no font defined, using %s\n", fontname);
712 
713     if (XrmGetResource(xdb, "MyMenu.layout", "*", datatype, &value) == true) {
714       char *v = strdup(value.addr);
715       check_allocation(v);
716       horizontal_layout = !strcmp(v, "horizontal");
717       free(v);
718     }
719     else
720       fprintf(stderr, "no layout defined, using horizontal\n");
721 
722     if (XrmGetResource(xdb, "MyMenu.prompt", "*", datatype, &value) == true) {
723       free(ps1);
724       ps1 = normalize_str(value.addr);
725     } else
726       fprintf(stderr, "no prompt defined, using \"%s\" as default\n", ps1);
727 
728     if (XrmGetResource(xdb, "MyMenu.width", "*", datatype, &value) == true)
729       width = parse_integer(value.addr, width, d_width);
730     else
731       fprintf(stderr, "no width defined, using %d\n", width);
732 
733     if (XrmGetResource(xdb, "MyMenu.height", "*", datatype, &value) == true)
734       height = parse_integer(value.addr, height, d_height);
735     else
736       fprintf(stderr, "no height defined, using %d\n", height);
737 
738     if (XrmGetResource(xdb, "MyMenu.x", "*", datatype, &value) == true)
739       x = parse_int_with_middle(value.addr, x, d_width, width);
740     else
741       fprintf(stderr, "no x defined, using %d\n", width);
742 
743     if (XrmGetResource(xdb, "MyMenu.y", "*", datatype, &value) == true)
744       y = parse_int_with_middle(value.addr, y, d_height, height);
745     else
746       fprintf(stderr, "no y defined, using %d\n", height);
747 
748     XColor tmp;
749     // TODO: tmp needs to be free'd after every allocation?
750 
751     // prompt
752     if (XrmGetResource(xdb, "MyMenu.prompt.foreground", "*", datatype, &value) == true)
753       XAllocNamedColor(d, cmap, value.addr, &p_fg, &tmp);
754     else
755       XAllocNamedColor(d, cmap, "white", &p_fg, &tmp);
756 
757     if (XrmGetResource(xdb, "MyMenu.prompt.background", "*", datatype, &value) == true)
758       XAllocNamedColor(d, cmap, value.addr, &p_bg, &tmp);
759     else
760       XAllocNamedColor(d, cmap, "black", &p_bg, &tmp);
761 
762     // completion
763     if (XrmGetResource(xdb, "MyMenu.completion.foreground", "*", datatype, &value) == true)
764       XAllocNamedColor(d, cmap, value.addr, &compl_fg, &tmp);
765     else
766       XAllocNamedColor(d, cmap, "white", &compl_fg, &tmp);
767 
768     if (XrmGetResource(xdb, "MyMenu.completion.background", "*", datatype, &value) == true)
769       XAllocNamedColor(d, cmap, value.addr, &compl_bg, &tmp);
770     else
771       XAllocNamedColor(d, cmap, "black", &compl_bg, &tmp);
772 
773     // completion highlighted
774     if (XrmGetResource(xdb, "MyMenu.completion_highlighted.foreground", "*", datatype, &value) == true)
775       XAllocNamedColor(d, cmap, value.addr, &compl_highlighted_fg, &tmp);
776     else
777       XAllocNamedColor(d, cmap, "black", &compl_highlighted_fg, &tmp);
778 
779     if (XrmGetResource(xdb, "MyMenu.completion_highlighted.background", "*", datatype, &value) == true)
780       XAllocNamedColor(d, cmap, value.addr, &compl_highlighted_bg, &tmp);
781     else
782       XAllocNamedColor(d, cmap, "white", &compl_highlighted_bg, &tmp);
783   } else {
784     XColor tmp;
785     XAllocNamedColor(d, cmap, "white", &p_fg, &tmp);
786     XAllocNamedColor(d, cmap, "black", &p_bg, &tmp);
787     XAllocNamedColor(d, cmap, "white", &compl_fg, &tmp);
788     XAllocNamedColor(d, cmap, "black", &compl_bg, &tmp);
789     XAllocNamedColor(d, cmap, "black", &compl_highlighted_fg, &tmp);
790     XAllocNamedColor(d, cmap, "white", &compl_highlighted_bg, &tmp);
791   }
792 
793   // load the font
794   /* XFontStruct *font = XLoadQueryFont(d, fontname); */
795   /* if (font == nil) { */
796   /*   fprintf(stderr, "Unable to load %s font\n", fontname); */
797   /*   font = XLoadQueryFont(d, "fixed"); */
798   /* } */
799   // load the font
800 #ifdef USE_XFT
801   XftFont *font = XftFontOpenName(d, DefaultScreen(d), fontname);
802 #else
803   char **missing_charset_list;
804   int missing_charset_count;
805   XFontSet font = XCreateFontSet(d, fontname, &missing_charset_list, &missing_charset_count, nil);
806   if (font == nil) {
807     fprintf(stderr, "Unable to load the font(s) %s\n", fontname);
808     return EX_UNAVAILABLE;
809   }
810 #endif
811 
812   // create the window
813   XSetWindowAttributes attr;
814 
815   Window w = XCreateWindow(d,                                   // display
816                            DefaultRootWindow(d),                // parent
817                            x + offset_x, y + offset_y,          // x y
818                            width, height,                       // w h
819                            0,                                   // border width
820                            DefaultDepth(d, DefaultScreen(d)),   // depth
821                            InputOutput,                         // class
822                            DefaultVisual(d, DefaultScreen(d)),  // visual
823                            0,                                   // value mask
824                            &attr);
825 
826   set_win_atoms_hints(d, w, width, height);
827 
828   // we want some events
829   XSelectInput(d, w, StructureNotifyMask | KeyPressMask | KeymapStateMask);
830 
831   // make the window appear on the screen
832   XMapWindow(d, w);
833 
834   // wait for the MapNotify event (i.e. the event "window rendered")
835   for (;;) {
836     XEvent e;
837     XNextEvent(d, &e);
838     if (e.type == MapNotify)
839       break;
840   }
841 
842   // get the *real* width & height after the window was rendered
843   get_wh(d, &w, &width, &height);
844 
845   // grab keyboard
846   take_keyboard(d, w);
847 
848   // Create some graphics contexts
849   XGCValues values;
850   /* values.font = font->fid; */
851 
852   struct rendering r = {
853     .d                          = d,
854     .w                          = w,
855 #ifdef USE_XFT
856     .font                       = font,
857 #else
858     .font                       = &font,
859 #endif
860     .prompt                     = XCreateGC(d, w, 0, &values),
861     .prompt_bg                  = XCreateGC(d, w, 0, &values),
862     .completion                 = XCreateGC(d, w, 0, &values),
863     .completion_bg              = XCreateGC(d, w, 0, &values),
864     .completion_highlighted     = XCreateGC(d, w, 0, &values),
865     .completion_highlighted_bg  = XCreateGC(d, w, 0, &values),
866     .width                      = width,
867     .height                     = height,
868     .horizontal_layout          = horizontal_layout,
869     .ps1                        = ps1,
870     .ps1len                     = strlen(ps1)
871   };
872     
873 #ifdef USE_XFT
874     r.xftdraw = XftDrawCreate(d, w, DefaultVisual(d, 0), DefaultColormap(d, 0));
875 
876     // prompt
877     XRenderColor xrcolor;
878     xrcolor.red          = p_fg.red;
879     xrcolor.green        = p_fg.red;
880     xrcolor.blue         = p_fg.red;
881     xrcolor.alpha        = 65535;
882     XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_prompt);
883 
884     // completion
885     xrcolor.red          = compl_fg.red;
886     xrcolor.green        = compl_fg.green;
887     xrcolor.blue         = compl_fg.blue;
888     xrcolor.alpha        = 65535;
889     XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_completion);
890 
891     // completion highlighted
892     xrcolor.red          = compl_highlighted_fg.red;
893     xrcolor.green        = compl_highlighted_fg.green;
894     xrcolor.blue         = compl_highlighted_fg.blue;
895     xrcolor.alpha        = 65535;
896     XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_completion_highlighted);
897 #endif
898     
899   // load the colors in our GCs
900   XSetForeground(d, r.prompt, p_fg.pixel);
901   XSetForeground(d, r.prompt_bg, p_bg.pixel);
902   XSetForeground(d, r.completion, compl_fg.pixel);
903   XSetForeground(d, r.completion_bg, compl_bg.pixel);
904   XSetForeground(d, r.completion_highlighted, compl_highlighted_fg.pixel);
905   XSetForeground(d, r.completion_highlighted_bg, compl_highlighted_bg.pixel);
906 
907   // open the X input method
908   XIM xim = XOpenIM(d, xdb, resname, resclass);
909   check_allocation(xim);
910 
911   XIMStyles *xis = nil;
912   if (XGetIMValues(xim, XNQueryInputStyle, &xis, NULL) || !xis) {
913     fprintf(stderr, "Input Styles could not be retrieved\n");
914     return EX_UNAVAILABLE;
915   }
916 
917   XIMStyle bestMatchStyle = 0;
918   for (int i = 0; i < xis->count_styles; ++i) {
919     XIMStyle ts = xis->supported_styles[i];
920     if (ts == (XIMPreeditNothing | XIMStatusNothing)) {
921       bestMatchStyle = ts;
922       break;
923     }
924   }
925   XFree(xis);
926 
927   if (!bestMatchStyle) {
928     fprintf(stderr, "No matching input style could be determined\n");
929   }
930 
931   XIC xic = XCreateIC(xim, XNInputStyle, bestMatchStyle, XNClientWindow, w, XNFocusWindow, w, NULL);
932   check_allocation(xic);
933 
934   // draw the window for the first time
935   draw(&r, text, cs);
936 
937   // main loop
938   while (status == LOOPING) {
939     XEvent e;
940     XNextEvent(d, &e);
941 
942     if (XFilterEvent(&e, w))
943       continue;
944 
945     switch (e.type) {
946     case KeymapNotify:
947       XRefreshKeyboardMapping(&e.xmapping);
948       break;
949 
950     case KeyPress: {
951       XKeyPressedEvent *ev = (XKeyPressedEvent*)&e;
952 
953       if (ev->keycode == XKeysymToKeycode(d, XK_Tab)) {
954         bool shift = (ev->state & ShiftMask);
955         struct completions *n = shift ? compl_select_prev(cs, nothing_selected)
956                                       : compl_select_next(cs, nothing_selected);
957         if (n != nil) {
958           nothing_selected = false;
959           free(text);
960           text = strdup(n->completion);
961           if (text == nil) {
962             fprintf(stderr, "Memory allocation error!\n");
963             status = ERR;
964             break;
965           }
966           textlen = strlen(text);
967         }
968         draw(&r, text, cs);
969         break;
970       }
971 
972       if (ev->keycode == XKeysymToKeycode(d, XK_BackSpace)) {
973         nothing_selected = true;
974         popc(text, textlen);
975         update_completions(cs, text, lines);
976         draw(&r, text, cs);
977         break;
978       }
979 
980       if (ev->keycode == XKeysymToKeycode(d, XK_Return)) {
981         status = OK;
982         break;
983       }
984 
985       if (ev->keycode == XKeysymToKeycode(d, XK_Escape)) {
986         status = ERR;
987         break;
988       }
989 
990       // try to read what the user pressed
991       int symbol = 0;
992       Status s = 0;
993       Xutf8LookupString(xic, ev, (char*)&symbol, 4, 0, &s);
994 
995       if (s == XBufferOverflow) {
996         // should not happen since there are no utf-8 characters
997         // larger than 24bits, but is something to be aware of when
998         // used to directly write to a string buffer
999         fprintf(stderr, "Buffer overflow when trying to create keyboard symbol map.\n");
1000         break;
1001       }
1002       char *str = (char*)&symbol;
1003 
1004       if (ev->state & ControlMask) {
1005         // check for some key bindings
1006         if (!strcmp(str, "")) { // C-u
1007           nothing_selected = true;
1008           for (int i = 0; i < textlen; ++i)
1009             text[i] = 0;
1010           update_completions(cs, text, lines);
1011         }
1012         if (!strcmp(str, "")) { // C-h
1013           nothing_selected = true;
1014           popc(text, textlen);
1015           update_completions(cs, text, lines);
1016         }
1017         if (!strcmp(str, "")) { // C-w
1018           nothing_selected = true;
1019 
1020           // `textlen` is the length of the allocated string, not the
1021           // length of the ACTUAL string
1022           int p = strlen(text) - 1;
1023           if (p >= 0) { // delete the current char
1024             text[p] = 0;
1025             p--;
1026           }
1027           while (p >= 0 && isalnum(text[p])) {
1028             text[p] = 0;
1029             p--;
1030           }
1031           // erase also trailing white space
1032           while (p >= 0 && isspace(text[p])) {
1033             text[p] = 0;
1034             p--;
1035           }
1036           update_completions(cs, text, lines);
1037         }
1038         if (!strcmp(str, "\r")) { // C-m
1039           status = OK;
1040         }
1041         draw(&r, text, cs);
1042         break;
1043       }
1044 
1045       int str_len = strlen(str);
1046       for (int i = 0; i < str_len; ++i) {
1047         textlen = pushc(&text, textlen, str[i]);
1048         if (textlen == -1) {
1049           fprintf(stderr, "Memory allocation error\n");
1050           status = ERR;
1051           break;
1052         }
1053         nothing_selected = true;
1054         update_completions(cs, text, lines);
1055       }
1056 
1057     }
1058       draw(&r, text, cs);
1059       break;
1060 
1061     default:
1062       fprintf(stderr, "Unknown event %d\n", e.type);
1063     }
1064   }
1065 
1066   release_keyboard(d);
1067 
1068   if (status == OK)
1069     printf("%s\n", text);
1070 
1071   for (int i = 0; i < nlines; ++i) {
1072     free(lines[i]);
1073   }
1074 
1075 #ifdef USE_XFT
1076     XftColorFree(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &r.xft_prompt);
1077     XftColorFree(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &r.xft_completion);
1078     XftColorFree(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &r.xft_completion_highlighted);
1079 #endif
1080 
1081   free(ps1);
1082   free(fontname);
1083   free(text);
1084   free(lines);
1085   compl_delete(cs);
1086 
1087   XDestroyWindow(d, w);
1088   XCloseDisplay(d);
1089 
1090   return status == OK ? 0 : 1;
1091 }