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Date:: Fri Jul 27 14:42:11 2018 UTC
Message:: partially resolved a rendering error
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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 #ifndef VERSION
27 # define VERSION "unknown"
28 #endif
29 
30 // Comfy
31 #define nil NULL
32 
33 #define resname "MyMenu"
34 #define resclass "mymenu"
35 
36 #define SYM_BUF_SIZE 4
37 
38 #ifdef USE_XFT
39 # define default_fontname "monospace"
40 #else
41 # define default_fontname "fixed"
42 #endif
43 
44 #define ARGS "hvae:p:P:l:f:W:H:x:y:b:B:t:T:c:C:s:S:d:A"
45 
46 #define MIN(a, b) ((a) < (b) ? (a) : (b))
47 #define MAX(a, b) ((a) > (b) ? (a) : (b))
48 
49 // If we don't have it or we don't want an "ignore case" completion
50 // style, fall back to `strstr(3)`
51 #ifndef USE_STRCASESTR
52 # define strcasestr strstr
53 #endif
54 
55 // The initial number of items to read
56 #define INITIAL_ITEMS 64
57 
58 // Abort if a is nil
59 #define check_allocation(a) {                         \
60     if (a == nil) {                                   \
61       fprintf(stderr, "Could not allocate memory\n"); \
62       abort();                                        \
63     }                                                 \
64   }
65 
66 #define inner_height(r) (r->height - r->border_n - r->border_s)
67 #define inner_width(r)  (r->width  - r->border_e - r->border_w)
68 
69 // The possible state of the event loop.
70 enum state {LOOPING, OK, ERR};
71 
72 // for the drawing-related function. The text to be rendered could be
73 // the prompt, a completion or a highlighted completion
74 enum text_type {PROMPT, COMPL, COMPL_HIGH};
75 
76 // These are the possible action to be performed after user input.
77 enum action {
78   EXIT,
79   CONFIRM,
80   NEXT_COMPL,
81   PREV_COMPL,
82   DEL_CHAR,
83   DEL_WORD,
84   DEL_LINE,
85   ADD_CHAR,
86   TOGGLE_FIRST_SELECTED
87 };
88 
89 // A big set of values that needs to be carried around (for drawing
90 // functions). A struct to rule them all
91 struct rendering {
92   Display *d; // connection to xorg
93   Window w;
94   int width;
95   int height;
96   int padding;
97   int x_zero; // the "zero" on the x axis (may not be 0 'cause the border)
98   int y_zero; // the same a x_zero, only for the y axis
99 
100   // The four border
101   int border_n;
102   int border_e;
103   int border_s;
104   int border_w;
105 
106   bool horizontal_layout;
107 
108   // the prompt
109   char *ps1;
110   int ps1len;
111 
112   // colors
113   GC prompt;
114   GC prompt_bg;
115   GC completion;
116   GC completion_bg;
117   GC completion_highlighted;
118   GC completion_highlighted_bg;
119   GC border_n_bg;
120   GC border_e_bg;
121   GC border_s_bg;
122   GC border_w_bg;
123 #ifdef USE_XFT
124   XftFont *font;
125   XftDraw *xftdraw;
126   XftColor xft_prompt;
127   XftColor xft_completion;
128   XftColor xft_completion_highlighted;
129 #else
130   XFontSet *font;
131 #endif
132 };
133 
134 // A simple linked list to store the completions.
135 struct completion {
136   char *completion;
137   char *rcompletion;
138   struct completion *next;
139 };
140 
141 // Wrap the linked list of completions
142 struct completions {
143   struct completion *completions;
144   int selected;
145   int lenght;
146 };
147 
148 // return a newly allocated (and empty) completion list
149 struct completions *compls_new() {
150   struct completions *cs = malloc(sizeof(struct completions));
151 
152   if (cs == nil)
153     return cs;
154 
155   cs->completions = nil;
156   cs->selected = -1;
157   cs->lenght = 0;
158   return cs;
159 }
160 
161 // Return a newly allocated (and empty) completion
162 struct completion *compl_new() {
163   struct completion *c = malloc(sizeof(struct completion));
164   if (c == nil)
165     return c;
166 
167   c->completion = nil;
168   c->rcompletion = nil;
169   c->next = nil;
170   return c;
171 }
172 
173 // delete ONLY the given completion (i.e. does not free c->next...)
174 void compl_delete(struct completion *c) {
175   free(c);
176 }
177 
178 // delete the current completion and the next (c->next) and so on...
179 void compl_delete_rec(struct completion *c) {
180   while (c != nil) {
181     struct completion *t = c->next;
182     free(c);
183     c = t;
184   }
185 }
186 
187 // Delete the wrapper and the whole list
188 void compls_delete(struct completions *cs) {
189   if (cs == nil)
190     return;
191 
192   compl_delete_rec(cs->completions);
193   free(cs);
194 }
195 
196 // create a completion list from a text and the list of possible
197 // completions (null terminated). Expects a non-null `cs'. lines and
198 // vlines should have the same lenght OR vlines is null
199 void filter(struct completions *cs, char *text, char **lines, char **vlines) {
200   struct completion *c = compl_new();
201   if (c == nil) {
202     return;
203   }
204 
205   cs->completions = c;
206 
207   int index = 0;
208   int matching = 0;
209 
210   if (vlines == nil)
211     vlines = lines;
212 
213   while (true) {
214     char *l = vlines[index] ? vlines[index] : lines[index];
215     if (l == nil)
216       break;
217 
218     if (strcasestr(l, text) != nil) {
219       matching++;
220 
221       c->next = compl_new();
222       c = c->next;
223       if (c == nil) {
224         compls_delete(cs);
225         return;
226       }
227       c->completion = l;
228       c->rcompletion = lines[index];
229     }
230 
231     index++;
232   }
233 
234   struct completion *f = cs->completions->next;
235   compl_delete(cs->completions);
236   cs->completions = f;
237   cs->lenght = matching;
238   cs->selected = -1;
239 }
240 
241 // update the given completion, that is: clean the old cs & generate a new one.
242 void update_completions(struct completions *cs, char *text, char **lines, char **vlines, bool first_selected) {
243   compl_delete_rec(cs->completions);
244   filter(cs, text, lines, vlines);
245   if (first_selected && cs->lenght > 0)
246     cs->selected = 0;
247 }
248 
249 // select the next, or the previous, selection and update some
250 // state. `text' will be updated with the text of the completion and
251 // `textlen' with the new lenght of `text'. If the memory cannot be
252 // allocated, `status' will be set to `ERR'.
253 void complete(struct completions *cs, bool first_selected, bool p, char **text, int *textlen, enum state *status) {
254   if (cs == nil || cs->lenght == 0)
255     return;
256 
257   // if the first is always selected, and the first entry is different
258   // from the text, expand the text and return
259   if (first_selected
260       && cs->selected == 0
261       && strcmp(cs->completions->completion, *text) != 0
262       && !p) {
263     free(*text);
264     *text = strdup(cs->completions->completion);
265     if (text == nil) {
266       *status = ERR;
267       return;
268     }
269     *textlen = strlen(*text);
270     return;
271   }
272 
273   int index = cs->selected;
274 
275   if (index == -1 && p)
276     index = 0;
277   index = cs->selected = (cs->lenght + (p ? index - 1 : index + 1)) % cs->lenght;
278 
279   struct completion *n = cs->completions;
280 
281   // find the selected item
282   while (index != 0) {
283     index--;
284     n = n->next;
285   }
286 
287   free(*text);
288   *text = strdup(n->completion);
289   if (text == nil) {
290     fprintf(stderr, "Memory allocation error!\n");
291     *status = ERR;
292     return;
293   }
294   *textlen = strlen(*text);
295 }
296 
297 // push the character c at the end of the string pointed by p
298 int pushc(char **p, int maxlen, char c) {
299   int len = strnlen(*p, maxlen);
300 
301   if (!(len < maxlen -2)) {
302     maxlen += maxlen >> 1;
303     char *newptr = realloc(*p, maxlen);
304     if (newptr == nil) { // bad!
305       return -1;
306     }
307     *p = newptr;
308   }
309 
310   (*p)[len] = c;
311   (*p)[len+1] = '\0';
312   return maxlen;
313 }
314 
315 // remove the last rune from the *utf8* string! This is different from
316 // just setting the last byte to 0 (in some cases ofc). Return a
317 // pointer (e) to the last non zero char. If e < p then p is empty!
318 char* popc(char *p) {
319   int len = strlen(p);
320   if (len == 0)
321     return p;
322 
323   char *e = p + len - 1;
324 
325   do {
326     char c = *e;
327     *e = 0;
328     e--;
329 
330     // if c is a starting byte (11......) or is under U+007F (ascii,
331     // basically) we're done
332     if (((c & 0x80) && (c & 0x40)) || !(c & 0x80))
333       break;
334   } while (e >= p);
335 
336   return e;
337 }
338 
339 // remove the last word plus trailing whitespaces from the give string
340 void popw(char *w) {
341   int len = strlen(w);
342   if (len == 0)
343     return;
344 
345   bool in_word = true;
346   while (true) {
347     char *e = popc(w);
348 
349     if (e < w)
350       return;
351 
352     if (in_word && isspace(*e))
353       in_word = false;
354 
355     if (!in_word && !isspace(*e))
356       return;
357   }
358 }
359 
360 // If the string is surrounded by quotes (`"`) remove them and replace
361 // every `\"` in the string with `"`
362 char *normalize_str(const char *str) {
363   int len = strlen(str);
364   if (len == 0)
365     return nil;
366 
367   char *s = calloc(len, sizeof(char));
368   check_allocation(s);
369   int p = 0;
370   while (*str) {
371     char c = *str;
372     if (*str == '\\') {
373       if (*(str + 1)) {
374         s[p] = *(str + 1);
375         p++;
376         str += 2; // skip this and the next char
377         continue;
378       } else {
379         break;
380       }
381     }
382     if (c == '"') {
383       str++; // skip only this char
384       continue;
385     }
386     s[p] = c;
387     p++;
388     str++;
389   }
390   return s;
391 }
392 
393 // read an arbitrary amount of text until an EOF and store it in
394 // lns. `items` is the capacity of lns. It may increase lns with
395 // `realloc(3)` to store more line. Return the number of lines
396 // read. The last item will always be a NULL pointer. It ignore the
397 // "null" (empty) lines
398 int readlines(char ***lns, int items) {
399   int n = 0;
400   char **lines = *lns;
401   while (true) {
402     size_t linelen = 0;
403     ssize_t l = getline(lines + n, &linelen, stdin);
404 
405     if (l == -1) {
406       break;
407     }
408 
409     if (linelen == 0 || lines[n][0] == '\n') {
410       free(lines[n]);
411       lines[n] = nil;
412       continue; // forget about this line
413     }
414 
415     strtok(lines[n], "\n"); // get rid of the \n
416 
417     ++n;
418 
419     if (n == items - 1) {
420       items += items >>1;
421       char **l = realloc(lines, sizeof(char*) * items);
422       check_allocation(l);
423       *lns = l;
424       lines = l;
425     }
426   }
427 
428   n++;
429   lines[n] = nil;
430   return items;
431 }
432 
433 // Compute the dimension of the string str once rendered, return the
434 // width and save the width and the height in ret_width and ret_height
435 int text_extents(char *str, int len, struct rendering *r, int *ret_width, int *ret_height) {
436   int height;
437   int width;
438 #ifdef USE_XFT
439   XGlyphInfo gi;
440   XftTextExtentsUtf8(r->d, r->font, str, len, &gi);
441   /* height = gi.height; */
442   /* height = (gi.height + (r->font->ascent - r->font->descent)/2) / 2; */
443   /* height = (r->font->ascent - r->font->descent)/2 + gi.height*2; */
444   height = r->font->ascent - r->font->descent;
445   width = gi.width - gi.x;
446 #else
447   XRectangle rect;
448   XmbTextExtents(*r->font, str, len, nil, &rect);
449   height = rect.height;
450   width = rect.width;
451 #endif
452   if (ret_width != nil)  *ret_width = width;
453   if (ret_height != nil) *ret_height = height;
454   return width;
455 }
456 
457 // Draw the string str
458 void draw_string(char *str, int len, int x, int y, struct rendering *r, enum text_type tt) {
459 #ifdef USE_XFT
460   XftColor xftcolor;
461   if (tt == PROMPT)     xftcolor = r->xft_prompt;
462   if (tt == COMPL)      xftcolor = r->xft_completion;
463   if (tt == COMPL_HIGH) xftcolor = r->xft_completion_highlighted;
464 
465   XftDrawStringUtf8(r->xftdraw, &xftcolor, r->font, x, y, str, len);
466 #else
467   GC gc;
468   if (tt == PROMPT)     gc = r->prompt;
469   if (tt == COMPL)      gc = r->completion;
470   if (tt == COMPL_HIGH) gc = r->completion_highlighted;
471   Xutf8DrawString(r->d, r->w, *r->font, gc, x, y, str, len);
472 #endif
473 }
474 
475 // Duplicate the string str and substitute every space with a 'n'
476 char *strdupn(char *str) {
477   int len = strlen(str);
478 
479   if (str == nil || len == 0)
480     return nil;
481 
482   char *dup = strdup(str);
483   if (dup == nil)
484     return nil;
485 
486   for (int i = 0; i < len; ++i)
487     if (dup[i] == ' ')
488       dup[i] = 'n';
489 
490   return dup;
491 }
492 
493 // |------------------|----------------------------------------------|
494 // | 20 char text     | completion | completion | completion | compl |
495 // |------------------|----------------------------------------------|
496 void draw_horizontally(struct rendering *r, char *text, struct completions *cs) {
497   int prompt_width = 20; // char
498 
499   int width, height;
500   int ps1xlen = text_extents(r->ps1, r->ps1len, r, &width, &height);
501   int start_at = ps1xlen;
502 
503   start_at = r->x_zero + text_extents("n", 1, r, nil, nil);
504   start_at = start_at * prompt_width + r->padding;
505 
506   int texty = (inner_height(r) + height + r->y_zero) / 2;
507 
508   XFillRectangle(r->d, r->w, r->prompt_bg, r->x_zero, r->y_zero, start_at, inner_height(r));
509 
510   int text_len = strlen(text);
511   if (text_len > prompt_width)
512     text = text + (text_len - prompt_width);
513   draw_string(r->ps1, r->ps1len, r->x_zero + r->padding, texty, r, PROMPT);
514   draw_string(text, MIN(text_len, prompt_width), r->x_zero + r->padding + ps1xlen, texty, r, PROMPT);
515 
516   XFillRectangle(r->d, r->w, r->completion_bg, start_at, r->y_zero, r->width, inner_height(r));
517 
518   struct completion *c = cs->completions;
519   for (int i = 0; c != nil; ++i) {
520     enum text_type tt = cs->selected == i ? COMPL_HIGH : COMPL;
521     GC h = cs->selected == i ? r->completion_highlighted_bg : r->completion_bg;
522 
523     int len = strlen(c->completion);
524     int text_width = text_extents(c->completion, len, r, nil, nil);
525 
526     XFillRectangle(r->d, r->w, h, start_at, r->y_zero, text_width + r->padding*2, inner_height(r));
527 
528     draw_string(c->completion, len, start_at + r->padding, texty, r, tt);
529 
530     start_at += text_width + r->padding * 2;
531 
532     if (start_at > inner_width(r))
533       break; // don't draw completion if the space isn't enough
534 
535     c = c->next;
536   }
537 }
538 
539 // |-----------------------------------------------------------------|
540 // |  prompt                                                         |
541 // |-----------------------------------------------------------------|
542 // |  completion                                                     |
543 // |-----------------------------------------------------------------|
544 // |  completion                                                     |
545 // |-----------------------------------------------------------------|
546 void draw_vertically(struct rendering *r, char *text, struct completions *cs) {
547   int height, width;
548   text_extents("fjpgl", 5, r, nil, &height);
549   int start_at = r->y_zero + r->padding*2 + height;
550 
551   XFillRectangle(r->d, r->w, r->completion_bg, r->x_zero, r->y_zero, r->width, r->height);
552   XFillRectangle(r->d, r->w, r->prompt_bg, r->x_zero, r->y_zero, r->width, start_at);
553 
554   int ps1xlen = text_extents(r->ps1, r->ps1len, r, nil, nil);
555 
556   draw_string(r->ps1, r->ps1len, r->x_zero + r->padding, r->y_zero + height + r->padding, r, PROMPT);
557   draw_string(text, strlen(text), r->x_zero + r->padding + ps1xlen, r->y_zero + height + r->padding, r, PROMPT);
558 
559   struct completion *c = cs->completions;
560   for (int i = 0; c != nil; ++i){
561     enum text_type tt = cs->selected == i ? COMPL_HIGH : COMPL;
562     GC h = cs->selected == i ? r->completion_highlighted_bg : r->completion_bg;
563 
564     int len = strlen(c->completion);
565     text_extents(c->completion, len, r, &width, &height);
566     XFillRectangle(r->d, r->w, h, r->x_zero, start_at, inner_width(r), height + r->padding*2);
567     draw_string(c->completion, len, r->x_zero + r->padding, start_at + height + r->padding, r, tt);
568 
569     start_at += height + r->padding *2;
570 
571     if (start_at > inner_height(r))
572       break; // don't draw completion if the space isn't enough
573 
574     c = c->next;
575   }
576 }
577 
578 void draw(struct rendering *r, char *text, struct completions *cs) {
579   if (r->horizontal_layout)
580     draw_horizontally(r, text, cs);
581   else
582     draw_vertically(r, text, cs);
583 
584   // draw the borders
585 
586   if (r->border_w != 0)
587     XFillRectangle(r->d, r->w, r->border_w_bg, 0, 0, r->border_w, r->height);
588 
589   if (r->border_e != 0)
590     XFillRectangle(r->d, r->w, r->border_e_bg, r->width - r->border_e, 0, r->border_e, r->height);
591 
592   if (r->border_n != 0)
593     XFillRectangle(r->d, r->w, r->border_n_bg, 0, 0, r->width, r->border_n);
594 
595   if (r->border_s != 0)
596     XFillRectangle(r->d, r->w, r->border_s_bg, 0, r->height - r->border_s, r->width, r->border_s);
597 
598   // send all the work to x
599   XFlush(r->d);
600 }
601 
602 /* Set some WM stuff */
603 void set_win_atoms_hints(Display *d, Window w, int width, int height) {
604   Atom type;
605   type = XInternAtom(d, "_NET_WM_WINDOW_TYPE_DOCK", false);
606   XChangeProperty(
607                   d,
608                   w,
609                   XInternAtom(d, "_NET_WM_WINDOW_TYPE", false),
610                   XInternAtom(d, "ATOM", false),
611                   32,
612                   PropModeReplace,
613                   (unsigned char *)&type,
614                   1
615                   );
616 
617   /* some window managers honor this properties */
618   type = XInternAtom(d, "_NET_WM_STATE_ABOVE", false);
619   XChangeProperty(d,
620                   w,
621                   XInternAtom(d, "_NET_WM_STATE", false),
622                   XInternAtom(d, "ATOM", false),
623                   32,
624                   PropModeReplace,
625                   (unsigned char *)&type,
626                   1
627                   );
628 
629   type = XInternAtom(d, "_NET_WM_STATE_FOCUSED", false);
630   XChangeProperty(d,
631                   w,
632                   XInternAtom(d, "_NET_WM_STATE", false),
633                   XInternAtom(d, "ATOM", false),
634                   32,
635                   PropModeAppend,
636                   (unsigned char *)&type,
637                   1
638                   );
639 
640   // setting window hints
641   XClassHint *class_hint = XAllocClassHint();
642   if (class_hint == nil) {
643     fprintf(stderr, "Could not allocate memory for class hint\n");
644     exit(EX_UNAVAILABLE);
645   }
646   class_hint->res_name = resname;
647   class_hint->res_class = resclass;
648   XSetClassHint(d, w, class_hint);
649   XFree(class_hint);
650 
651   XSizeHints *size_hint = XAllocSizeHints();
652   if (size_hint == nil) {
653     fprintf(stderr, "Could not allocate memory for size hint\n");
654     exit(EX_UNAVAILABLE);
655   }
656   size_hint->flags = PMinSize | PBaseSize;
657   size_hint->min_width = width;
658   size_hint->base_width = width;
659   size_hint->min_height = height;
660   size_hint->base_height = height;
661 
662   XFlush(d);
663 }
664 
665 // write the width and height of the window `w' respectively in `width'
666 // and `height'.
667 void get_wh(Display *d, Window *w, int *width, int *height) {
668   XWindowAttributes win_attr;
669   XGetWindowAttributes(d, *w, &win_attr);
670   *height = win_attr.height;
671   *width = win_attr.width;
672 }
673 
674 int grabfocus(Display *d, Window w) {
675   for (int i = 0; i < 100; ++i) {
676     Window focuswin;
677     int revert_to_win;
678     XGetInputFocus(d, &focuswin, &revert_to_win);
679     if (focuswin == w)
680       return true;
681     XSetInputFocus(d, w, RevertToParent, CurrentTime);
682     usleep(1000);
683   }
684   return 0;
685 }
686 
687 // I know this may seem a little hackish BUT is the only way I managed
688 // to actually grab that goddam keyboard. Only one call to
689 // XGrabKeyboard does not always end up with the keyboard grabbed!
690 int take_keyboard(Display *d, Window w) {
691   int i;
692   for (i = 0; i < 100; i++) {
693     if (XGrabKeyboard(d, w, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
694       return 1;
695     usleep(1000);
696   }
697   fprintf(stderr, "Cannot grab keyboard\n");
698   return 0;
699 }
700 
701 // release the keyboard.
702 void release_keyboard(Display *d) {
703   XUngrabKeyboard(d, CurrentTime);
704 }
705 
706 // Given a string, try to parse it as a number or return
707 // `default_value'.
708 int parse_integer(const char *str, int default_value) {
709   errno = 0;
710   char *ep;
711   long lval = strtol(str, &ep, 10);
712   if (str[0] == '\0' || *ep != '\0') { // NaN
713     fprintf(stderr, "'%s' is not a valid number! Using %d as default.\n", str, default_value);
714     return default_value;
715   }
716   if ((errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN)) ||
717       (lval > INT_MAX || lval < INT_MIN)) {
718     fprintf(stderr, "%s out of range! Using %d as default.\n", str, default_value);
719     return default_value;
720   }
721   return lval;
722 }
723 
724 // like parse_integer, but if the value ends with a `%' then its
725 // treated like a percentage (`max' is used to compute the percentage)
726 int parse_int_with_percentage(const char *str, int default_value, int max) {
727   int len = strlen(str);
728   if (len > 0 && str[len-1] == '%') {
729     char *cpy = strdup(str);
730     check_allocation(cpy);
731     cpy[len-1] = '\0';
732     int val = parse_integer(cpy, default_value);
733     free(cpy);
734     return val * max / 100;
735   }
736   return parse_integer(str, default_value);
737 }
738 
739 // like parse_int_with_percentage but understands some special values
740 // - "middle" that is (max - self) / 2
741 // - "start"  that is 0
742 // - "end"    that is (max - self)
743 int parse_int_with_pos(const char *str, int default_value, int max, int self) {
744   if (!strcmp(str, "start"))
745     return 0;
746   if (!strcmp(str, "middle"))
747     return (max - self)/2;
748   if (!strcmp(str, "end"))
749     return max-self;
750   return parse_int_with_percentage(str, default_value, max);
751 }
752 
753 // parse a string like a css value (for example like the css
754 // margin/padding properties). Will ALWAYS return an array of 4 word
755 // TODO: harden this function!
756 char **parse_csslike(const char *str) {
757   char *s = strdup(str);
758   if (s == nil)
759     return nil;
760 
761   char **ret = malloc(4 * sizeof(char*));
762   if (ret == nil) {
763     free(s);
764     return nil;
765   }
766 
767   int i = 0;
768   char *token;
769   while ((token = strsep(&s, " ")) != NULL && i < 4) {
770     ret[i] = strdup(token);
771     i++;
772   }
773 
774   if (i == 1)
775     for (int j = 1; j < 4; j++)
776       ret[j] = strdup(ret[0]);
777 
778   if (i == 2) {
779     ret[2] = strdup(ret[0]);
780     ret[3] = strdup(ret[1]);
781   }
782 
783   if (i == 3)
784     ret[3] = strdup(ret[1]);
785 
786   // Before we didn't check for the return type of strdup, here we will
787 
788   bool any_null = false;
789   for (int i = 0; i < 4; ++i)
790     any_null = ret[i] == nil || any_null;
791 
792   if (any_null)
793     for (int i = 0; i < 4; ++i)
794       if (ret[i] != nil)
795         free(ret[i]);
796 
797   if (i == 0 || any_null) {
798     free(s);
799     free(ret);
800     return nil;
801   }
802 
803   return ret;
804 }
805 
806 // Given an event, try to understand what the user wants. If the
807 // return value is ADD_CHAR then `input' is a pointer to a string that
808 // will need to be free'ed.
809 enum action parse_event(Display *d, XKeyPressedEvent *ev, XIC xic, char **input) {
810   if (ev->keycode == XKeysymToKeycode(d, XK_BackSpace))
811     return DEL_CHAR;
812 
813   if (ev->keycode == XKeysymToKeycode(d, XK_Tab))
814     return ev->state & ShiftMask ? PREV_COMPL : NEXT_COMPL;
815 
816   if (ev->keycode == XKeysymToKeycode(d, XK_Return))
817     return CONFIRM;
818 
819   if (ev->keycode == XKeysymToKeycode(d, XK_Escape))
820     return EXIT;
821 
822   // try to read what the user pressed
823   char str[SYM_BUF_SIZE] = {0};
824   Status s = 0;
825   Xutf8LookupString(xic, ev, str, SYM_BUF_SIZE, 0, &s);
826   if (s == XBufferOverflow) {
827     // should not happen since there are no utf-8 characters larger
828     // than 24bits
829     fprintf(stderr, "Buffer overflow when trying to create keyboard symbol map.\n");
830     return EXIT;
831   }
832 
833   if (ev->state & ControlMask) {
834     if (!strcmp(str, "")) // C-u
835       return DEL_LINE;
836     if (!strcmp(str, "")) // C-w
837       return DEL_WORD;
838     if (!strcmp(str, "")) // C-h
839       return DEL_CHAR;
840     if (!strcmp(str, "\r")) // C-m
841       return CONFIRM;
842     if (!strcmp(str, "")) // C-p
843       return PREV_COMPL;
844     if (!strcmp(str, "")) // C-n
845       return NEXT_COMPL;
846     if (!strcmp(str, "")) // C-c
847       return EXIT;
848     if (!strcmp(str, "\t")) // C-i
849       return TOGGLE_FIRST_SELECTED;
850   }
851 
852   *input = strdup(str);
853   if (*input == nil) {
854     fprintf(stderr, "Error while allocating memory for key.\n");
855     return EXIT;
856   }
857 
858   return ADD_CHAR;
859 }
860 
861 // Given the name of the program (argv[0]?) print a small help on stderr
862 void usage(char *prgname) {
863   fprintf(stderr, "%s [-hva] [-p prompt] [-x coord] [-y coord] [-W width] [-H height]\n"
864                   "       [-P padding] [-l layout] [-f font] [-b borders] [-B colors]\n"
865                   "       [-t color] [-T color] [-c color] [-C color] [-s color] [-S color]\n"
866                   "       [-w window_id]\n", prgname);
867 }
868 
869 int main(int argc, char **argv) {
870 #ifdef HAVE_PLEDGE
871   // stdio & rpat: to read and write stdio/stdout
872   // unix:         to connect to Xorg
873   pledge("stdio rpath unix", "");
874 #endif
875 
876   char *sep = nil;
877 
878   // by default the first completion isn't selected
879   bool first_selected = false;
880 
881   // our parent window
882   char *parent_window_id = nil;
883 
884   // the user can input arbitrary text
885   bool free_text = true;
886 
887   // first round of args parsing
888   int ch;
889   while ((ch = getopt(argc, argv, ARGS)) != -1) {
890     switch (ch) {
891       case 'h': // help
892         usage(*argv);
893         return 0;
894       case 'v': // version
895         fprintf(stderr, "%s version: %s\n", *argv, VERSION);
896         return 0;
897       case 'e': // embed
898         parent_window_id = strdup(optarg);
899         check_allocation(parent_window_id);
900         break;
901       case 'd': {
902         sep = strdup(optarg);
903         check_allocation(sep);
904       }
905       case 'A': {
906         free_text = false;
907         break;
908       }
909       default:
910         break;
911     }
912   }
913 
914   // read the lines from stdin
915   char **lines = calloc(INITIAL_ITEMS, sizeof(char*));
916   check_allocation(lines);
917   int nlines = readlines(&lines, INITIAL_ITEMS);
918   char **vlines = nil;
919   if (sep != nil) {
920     int l = strlen(sep);
921     vlines = calloc(nlines, sizeof(char*));
922     check_allocation(vlines);
923 
924     for (int i = 0; lines[i] != nil; i++) {
925       char *t = strstr(lines[i], sep);
926       if (t == nil)
927         vlines[i] = lines[i];
928       else
929         vlines[i] = t + l;
930     }
931   }
932 
933   setlocale(LC_ALL, getenv("LANG"));
934 
935   enum state status = LOOPING;
936 
937   // where the monitor start (used only with xinerama)
938   int offset_x = 0;
939   int offset_y = 0;
940 
941   // width and height of the window
942   int width = 400;
943   int height = 20;
944 
945   // position on the screen
946   int x = 0;
947   int y = 0;
948 
949   // the default padding
950   int padding = 10;
951 
952   // the default borders
953   int border_n = 0;
954   int border_e = 0;
955   int border_s = 0;
956   int border_w = 0;
957 
958   // the prompt. We duplicate the string so later is easy to free (in
959   // the case the user provide its own prompt)
960   char *ps1 = strdup("$ ");
961   check_allocation(ps1);
962 
963   // same for the font name
964   char *fontname = strdup(default_fontname);
965   check_allocation(fontname);
966 
967   int textlen = 10;
968   char *text = malloc(textlen * sizeof(char));
969   check_allocation(text);
970 
971   /* struct completions *cs = filter(text, lines); */
972   struct completions *cs = compls_new();
973   check_allocation(cs);
974 
975   // start talking to xorg
976   Display *d = XOpenDisplay(nil);
977   if (d == nil) {
978     fprintf(stderr, "Could not open display!\n");
979     return EX_UNAVAILABLE;
980   }
981 
982   Window parent_window;
983   bool embed = true;
984   if (! (parent_window_id && (parent_window = strtol(parent_window_id, nil, 0)))) {
985     parent_window = DefaultRootWindow(d);
986     embed = false;
987   }
988 
989   // get display size
990   int d_width;
991   int d_height;
992   get_wh(d, &parent_window, &d_width, &d_height);
993 
994 #ifdef USE_XINERAMA
995   if (!embed && XineramaIsActive(d)) {
996     // find the mice
997     int number_of_screens = XScreenCount(d);
998     Window r;
999     Window root;
1000     int root_x, root_y, win_x, win_y;
1001     unsigned int mask;
1002     bool res;
1003     for (int i = 0; i < number_of_screens; ++i) {
1004       root = XRootWindow(d, i);
1005       res = XQueryPointer(d, root, &r, &r, &root_x, &root_y, &win_x, &win_y, &mask);
1006       if (res) break;
1007     }
1008     if (!res) {
1009       fprintf(stderr, "No mouse found.\n");
1010       root_x = 0;
1011       root_y = 0;
1012     }
1013 
1014     // now find in which monitor the mice is on
1015     int monitors;
1016     XineramaScreenInfo *info = XineramaQueryScreens(d, &monitors);
1017     if (info) {
1018       for (int i = 0; i < monitors; ++i) {
1019         if (info[i].x_org <= root_x && root_x <= (info[i].x_org + info[i].width)
1020             && info[i].y_org <= root_y && root_y <= (info[i].y_org + info[i].height)) {
1021           offset_x = info[i].x_org;
1022           offset_y = info[i].y_org;
1023           d_width = info[i].width;
1024           d_height = info[i].height;
1025           break;
1026         }
1027       }
1028     }
1029     XFree(info);
1030   }
1031 #endif
1032 
1033   Colormap cmap = DefaultColormap(d, DefaultScreen(d));
1034   XColor p_fg, p_bg,
1035     compl_fg, compl_bg,
1036     compl_highlighted_fg, compl_highlighted_bg,
1037     border_n_bg, border_e_bg, border_s_bg, border_w_bg;
1038 
1039   bool horizontal_layout = true;
1040 
1041   // read resource
1042   XrmInitialize();
1043   char *xrm = XResourceManagerString(d);
1044   XrmDatabase xdb = nil;
1045   if (xrm != nil) {
1046     xdb = XrmGetStringDatabase(xrm);
1047     XrmValue value;
1048     char *datatype[20];
1049 
1050     if (XrmGetResource(xdb, "MyMenu.font", "*", datatype, &value) == true) {
1051       fontname = strdup(value.addr);
1052       check_allocation(fontname);
1053     } else {
1054       fprintf(stderr, "no font defined, using %s\n", fontname);
1055     }
1056 
1057     if (XrmGetResource(xdb, "MyMenu.layout", "*", datatype, &value) == true)
1058       horizontal_layout = !strcmp(value.addr, "horizontal");
1059     else
1060       fprintf(stderr, "no layout defined, using horizontal\n");
1061 
1062     if (XrmGetResource(xdb, "MyMenu.prompt", "*", datatype, &value) == true) {
1063       free(ps1);
1064       ps1 = normalize_str(value.addr);
1065     } else {
1066       fprintf(stderr, "no prompt defined, using \"%s\" as default\n", ps1);
1067     }
1068 
1069     if (XrmGetResource(xdb, "MyMenu.width", "*", datatype, &value) == true)
1070       width = parse_int_with_percentage(value.addr, width, d_width);
1071     else
1072       fprintf(stderr, "no width defined, using %d\n", width);
1073 
1074     if (XrmGetResource(xdb, "MyMenu.height", "*", datatype, &value) == true)
1075       height = parse_int_with_percentage(value.addr, height, d_height);
1076     else
1077       fprintf(stderr, "no height defined, using %d\n", height);
1078 
1079     if (XrmGetResource(xdb, "MyMenu.x", "*", datatype, &value) == true)
1080       x = parse_int_with_pos(value.addr, x, d_width, width);
1081     else
1082       fprintf(stderr, "no x defined, using %d\n", x);
1083 
1084     if (XrmGetResource(xdb, "MyMenu.y", "*", datatype, &value) == true)
1085       y = parse_int_with_pos(value.addr, y, d_height, height);
1086     else
1087       fprintf(stderr, "no y defined, using %d\n", y);
1088 
1089     if (XrmGetResource(xdb, "MyMenu.padding", "*", datatype, &value) == true)
1090       padding = parse_integer(value.addr, padding);
1091     else
1092       fprintf(stderr, "no padding defined, using %d\n", padding);
1093 
1094     if (XrmGetResource(xdb, "MyMenu.border.size", "*", datatype, &value) == true) {
1095       char **borders = parse_csslike(value.addr);
1096       if (borders != nil) {
1097         border_n = parse_integer(borders[0], 0);
1098         border_e = parse_integer(borders[1], 0);
1099         border_s = parse_integer(borders[2], 0);
1100         border_w = parse_integer(borders[3], 0);
1101       } else {
1102         fprintf(stderr, "error while parsing MyMenu.border.size\n");
1103       }
1104     } else {
1105       fprintf(stderr, "no border defined, using 0.\n");
1106     }
1107 
1108     XColor tmp;
1109     // TODO: tmp needs to be free'd after every allocation?
1110 
1111     // prompt
1112     if (XrmGetResource(xdb, "MyMenu.prompt.foreground", "*", datatype, &value) == true)
1113       XAllocNamedColor(d, cmap, value.addr, &p_fg, &tmp);
1114     else
1115       XAllocNamedColor(d, cmap, "white", &p_fg, &tmp);
1116 
1117     if (XrmGetResource(xdb, "MyMenu.prompt.background", "*", datatype, &value) == true)
1118       XAllocNamedColor(d, cmap, value.addr, &p_bg, &tmp);
1119     else
1120       XAllocNamedColor(d, cmap, "black", &p_bg, &tmp);
1121 
1122     // completion
1123     if (XrmGetResource(xdb, "MyMenu.completion.foreground", "*", datatype, &value) == true)
1124       XAllocNamedColor(d, cmap, value.addr, &compl_fg, &tmp);
1125     else
1126       XAllocNamedColor(d, cmap, "white", &compl_fg, &tmp);
1127 
1128     if (XrmGetResource(xdb, "MyMenu.completion.background", "*", datatype, &value) == true)
1129       XAllocNamedColor(d, cmap, value.addr, &compl_bg, &tmp);
1130     else
1131       XAllocNamedColor(d, cmap, "black", &compl_bg, &tmp);
1132 
1133     // completion highlighted
1134     if (XrmGetResource(xdb, "MyMenu.completion_highlighted.foreground", "*", datatype, &value) == true)
1135       XAllocNamedColor(d, cmap, value.addr, &compl_highlighted_fg, &tmp);
1136     else
1137       XAllocNamedColor(d, cmap, "black", &compl_highlighted_fg, &tmp);
1138 
1139     if (XrmGetResource(xdb, "MyMenu.completion_highlighted.background", "*", datatype, &value) == true)
1140       XAllocNamedColor(d, cmap, value.addr, &compl_highlighted_bg, &tmp);
1141     else
1142       XAllocNamedColor(d, cmap, "white", &compl_highlighted_bg, &tmp);
1143 
1144     // border
1145     if (XrmGetResource(xdb, "MyMenu.border.color", "*", datatype, &value) == true) {
1146       char **colors = parse_csslike(value.addr);
1147       if (colors != nil) {
1148         XAllocNamedColor(d, cmap, colors[0], &border_n_bg, &tmp);
1149         XAllocNamedColor(d, cmap, colors[1], &border_e_bg, &tmp);
1150         XAllocNamedColor(d, cmap, colors[2], &border_s_bg, &tmp);
1151         XAllocNamedColor(d, cmap, colors[3], &border_w_bg, &tmp);
1152       } else {
1153         fprintf(stderr, "error while parsing MyMenu.border.color\n");
1154       }
1155     } else {
1156       XAllocNamedColor(d, cmap, "white", &border_n_bg, &tmp);
1157       XAllocNamedColor(d, cmap, "white", &border_e_bg, &tmp);
1158       XAllocNamedColor(d, cmap, "white", &border_s_bg, &tmp);
1159       XAllocNamedColor(d, cmap, "white", &border_w_bg, &tmp);
1160     }
1161   } else {
1162     XColor tmp;
1163     XAllocNamedColor(d, cmap, "white", &p_fg, &tmp);
1164     XAllocNamedColor(d, cmap, "black", &p_bg, &tmp);
1165     XAllocNamedColor(d, cmap, "white", &compl_fg, &tmp);
1166     XAllocNamedColor(d, cmap, "black", &compl_bg, &tmp);
1167     XAllocNamedColor(d, cmap, "black", &compl_highlighted_fg, &tmp);
1168     XAllocNamedColor(d, cmap, "white", &border_n_bg, &tmp);
1169     XAllocNamedColor(d, cmap, "white", &border_e_bg, &tmp);
1170     XAllocNamedColor(d, cmap, "white", &border_s_bg, &tmp);
1171     XAllocNamedColor(d, cmap, "white", &border_w_bg, &tmp);
1172   }
1173 
1174   // second round of args parsing
1175   optind = 0; // reset the option index
1176   while ((ch = getopt(argc, argv, ARGS)) != -1) {
1177     switch (ch) {
1178       case 'a':
1179         first_selected = true;
1180         break;
1181       case 'A':
1182         // free_text -- this case was already catched
1183         break;
1184       case 'd':
1185         // separator -- this case was already catched
1186         break;
1187       case 'e':
1188         // (embedding mymenu) this case was already catched.
1189         break;
1190       case 'p': {
1191         char *newprompt = strdup(optarg);
1192         if (newprompt != nil) {
1193           free(ps1);
1194           ps1 = newprompt;
1195         }
1196         break;
1197       }
1198       case 'x':
1199         x = parse_int_with_pos(optarg, x, d_width, width);
1200         break;
1201       case 'y':
1202         y = parse_int_with_pos(optarg, y, d_height, height);
1203         break;
1204       case 'P':
1205         padding = parse_integer(optarg, padding);
1206         break;
1207       case 'l':
1208         horizontal_layout = !strcmp(optarg, "horizontal");
1209         break;
1210       case 'f': {
1211         char *newfont = strdup(optarg);
1212         if (newfont != nil) {
1213           free(fontname);
1214           fontname = newfont;
1215         }
1216         break;
1217       }
1218       case 'W':
1219         width = parse_int_with_percentage(optarg, width, d_width);
1220         break;
1221       case 'H':
1222         height = parse_int_with_percentage(optarg, height, d_height);
1223         break;
1224       case 'b': {
1225         char **borders = parse_csslike(optarg);
1226         if (borders != nil) {
1227           border_n = parse_integer(borders[0], 0);
1228           border_e = parse_integer(borders[1], 0);
1229           border_s = parse_integer(borders[2], 0);
1230           border_w = parse_integer(borders[3], 0);
1231         } else {
1232           fprintf(stderr, "Error parsing b option\n");
1233         }
1234         break;
1235       }
1236       case 'B': {
1237         char **colors = parse_csslike(optarg);
1238         if (colors != nil) {
1239           XColor tmp;
1240           XAllocNamedColor(d, cmap, colors[0], &border_n_bg, &tmp);
1241           XAllocNamedColor(d, cmap, colors[1], &border_e_bg, &tmp);
1242           XAllocNamedColor(d, cmap, colors[2], &border_s_bg, &tmp);
1243           XAllocNamedColor(d, cmap, colors[3], &border_w_bg, &tmp);
1244         } else {
1245           fprintf(stderr, "error while parsing B option\n");
1246         }
1247         break;
1248       }
1249       case 't': {
1250         XColor tmp;
1251         XAllocNamedColor(d, cmap, optarg, &p_fg, &tmp);
1252         break;
1253       }
1254       case 'T': {
1255         XColor tmp;
1256         XAllocNamedColor(d, cmap, optarg, &p_bg, &tmp);
1257         break;
1258       }
1259       case 'c': {
1260         XColor tmp;
1261         XAllocNamedColor(d, cmap, optarg, &compl_fg, &tmp);
1262         break;
1263       }
1264       case 'C': {
1265         XColor tmp;
1266         XAllocNamedColor(d, cmap, optarg, &compl_bg, &tmp);
1267         break;
1268       }
1269       case 's': {
1270         XColor tmp;
1271         XAllocNamedColor(d, cmap, optarg, &compl_highlighted_fg, &tmp);
1272         break;
1273       }
1274       case 'S': {
1275         XColor tmp;
1276         XAllocNamedColor(d, cmap, optarg, &compl_highlighted_bg, &tmp);
1277         break;
1278       }
1279       default:
1280         fprintf(stderr, "Unrecognized option %c\n", ch);
1281         status = ERR;
1282         break;
1283     }
1284   }
1285 
1286   // since only now we know if the first should be selected, update
1287   // the completion here
1288   update_completions(cs, text, lines, vlines, first_selected);
1289 
1290   // load the font
1291 #ifdef USE_XFT
1292   XftFont *font = XftFontOpenName(d, DefaultScreen(d), fontname);
1293 #else
1294   char **missing_charset_list;
1295   int missing_charset_count;
1296   XFontSet font = XCreateFontSet(d, fontname, &missing_charset_list, &missing_charset_count, nil);
1297   if (font == nil) {
1298     fprintf(stderr, "Unable to load the font(s) %s\n", fontname);
1299     return EX_UNAVAILABLE;
1300   }
1301 #endif
1302 
1303   // create the window
1304   XSetWindowAttributes attr;
1305   attr.override_redirect = true;
1306   attr.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
1307 
1308   Window w = XCreateWindow(d,                                   // display
1309                            parent_window,                       // parent
1310                            x + offset_x, y + offset_y,          // x y
1311                            width, height,                       // w h
1312                            0,                                   // border width
1313                            CopyFromParent,                      // depth
1314                            InputOutput,                         // class
1315                            CopyFromParent,                      // visual
1316                            CWEventMask | CWOverrideRedirect,    // value mask (CWBackPixel in the future also?)
1317                            &attr);
1318 
1319   set_win_atoms_hints(d, w, width, height);
1320 
1321   // we want some events
1322   XSelectInput(d, w, StructureNotifyMask | KeyPressMask | KeymapStateMask);
1323   XMapRaised(d, w);
1324 
1325   // if embed, listen for other events as well
1326   if (embed) {
1327     XSelectInput(d, parent_window, FocusChangeMask);
1328     Window *children, parent, root;
1329     unsigned int children_no;
1330     if (XQueryTree(d, parent_window, &root, &parent, &children, &children_no) && children) {
1331       for (unsigned int i = 0; i < children_no && children[i] != w; ++i)
1332         XSelectInput(d, children[i], FocusChangeMask);
1333       XFree(children);
1334     }
1335     grabfocus(d, w);
1336   }
1337 
1338   // grab keyboard
1339   take_keyboard(d, w);
1340 
1341   // Create some graphics contexts
1342   XGCValues values;
1343   /* values.font = font->fid; */
1344 
1345   struct rendering r = {
1346     .d                          = d,
1347     .w                          = w,
1348     .width                      = width,
1349     .height                     = height,
1350     .padding                    = padding,
1351     .x_zero                     = border_w,
1352     .y_zero                     = border_n,
1353     .border_n                   = border_n,
1354     .border_e                   = border_e,
1355     .border_s                   = border_s,
1356     .border_w                   = border_w,
1357     .horizontal_layout          = horizontal_layout,
1358     .ps1                        = ps1,
1359     .ps1len                     = strlen(ps1),
1360     .prompt                     = XCreateGC(d, w, 0, &values),
1361     .prompt_bg                  = XCreateGC(d, w, 0, &values),
1362     .completion                 = XCreateGC(d, w, 0, &values),
1363     .completion_bg              = XCreateGC(d, w, 0, &values),
1364     .completion_highlighted     = XCreateGC(d, w, 0, &values),
1365     .completion_highlighted_bg  = XCreateGC(d, w, 0, &values),
1366     .border_n_bg                = XCreateGC(d, w, 0, &values),
1367     .border_e_bg                = XCreateGC(d, w, 0, &values),
1368     .border_s_bg                = XCreateGC(d, w, 0, &values),
1369     .border_w_bg                = XCreateGC(d, w, 0, &values),
1370 #ifdef USE_XFT
1371     .font                       = font,
1372 #else
1373     .font                       = &font,
1374 #endif
1375   };
1376 
1377 #ifdef USE_XFT
1378   r.xftdraw = XftDrawCreate(d, w, DefaultVisual(d, 0), DefaultColormap(d, 0));
1379 
1380   // prompt
1381   XRenderColor xrcolor;
1382   xrcolor.red          = p_fg.red;
1383   xrcolor.green        = p_fg.red;
1384   xrcolor.blue         = p_fg.red;
1385   xrcolor.alpha        = 65535;
1386   XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_prompt);
1387 
1388   // completion
1389   xrcolor.red          = compl_fg.red;
1390   xrcolor.green        = compl_fg.green;
1391   xrcolor.blue         = compl_fg.blue;
1392   xrcolor.alpha        = 65535;
1393   XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_completion);
1394 
1395   // completion highlighted
1396   xrcolor.red          = compl_highlighted_fg.red;
1397   xrcolor.green        = compl_highlighted_fg.green;
1398   xrcolor.blue         = compl_highlighted_fg.blue;
1399   xrcolor.alpha        = 65535;
1400   XftColorAllocValue(d, DefaultVisual(d, 0), DefaultColormap(d, 0), &xrcolor, &r.xft_completion_highlighted);
1401 #endif
1402 
1403   // load the colors in our GCs
1404   XSetForeground(d, r.prompt, p_fg.pixel);
1405   XSetForeground(d, r.prompt_bg, p_bg.pixel);
1406   XSetForeground(d, r.completion, compl_fg.pixel);
1407   XSetForeground(d, r.completion_bg, compl_bg.pixel);
1408   XSetForeground(d, r.completion_highlighted, compl_highlighted_fg.pixel);
1409   XSetForeground(d, r.completion_highlighted_bg, compl_highlighted_bg.pixel);
1410   XSetForeground(d, r.border_n_bg, border_n_bg.pixel);
1411   XSetForeground(d, r.border_e_bg, border_e_bg.pixel);
1412   XSetForeground(d, r.border_s_bg, border_s_bg.pixel);
1413   XSetForeground(d, r.border_w_bg, border_w_bg.pixel);
1414 
1415   // open the X input method
1416   XIM xim = XOpenIM(d, xdb, resname, resclass);
1417   check_allocation(xim);
1418 
1419   XIMStyles *xis = nil;
1420   if (XGetIMValues(xim, XNQueryInputStyle, &xis, NULL) || !xis) {
1421     fprintf(stderr, "Input Styles could not be retrieved\n");
1422     return EX_UNAVAILABLE;
1423   }
1424 
1425   XIMStyle bestMatchStyle = 0;
1426   for (int i = 0; i < xis->count_styles; ++i) {
1427     XIMStyle ts = xis->supported_styles[i];
1428     if (ts == (XIMPreeditNothing | XIMStatusNothing)) {
1429       bestMatchStyle = ts;
1430       break;
1431     }
1432   }
1433   XFree(xis);
1434 
1435   if (!bestMatchStyle) {
1436     fprintf(stderr, "No matching input style could be determined\n");
1437   }
1438 
1439   XIC xic = XCreateIC(xim, XNInputStyle, bestMatchStyle, XNClientWindow, w, XNFocusWindow, w, NULL);
1440   check_allocation(xic);
1441 
1442   // draw the window for the first time
1443   draw(&r, text, cs);
1444 
1445   // main loop
1446   while (status == LOOPING) {
1447     XEvent e;
1448     XNextEvent(d, &e);
1449 
1450     if (XFilterEvent(&e, w))
1451       continue;
1452 
1453     switch (e.type) {
1454       case KeymapNotify:
1455         XRefreshKeyboardMapping(&e.xmapping);
1456         break;
1457 
1458       case FocusIn:
1459         // re-grab focus
1460         if (e.xfocus.window != w)
1461           grabfocus(d, w);
1462         break;
1463 
1464       case VisibilityNotify:
1465         if (e.xvisibility.state != VisibilityUnobscured)
1466           XRaiseWindow(d, w);
1467         break;
1468 
1469       case MapNotify:
1470         /* fprintf(stderr, "Map Notify!\n"); */
1471         /* TODO: update the computed window and height! */
1472         /* get_wh(d, &w, width, height); */
1473         draw(&r, text, cs);
1474         break;
1475 
1476       case KeyPress: {
1477         XKeyPressedEvent *ev = (XKeyPressedEvent*)&e;
1478 
1479         char *input;
1480         switch (parse_event(d, ev, xic, &input)) {
1481           case EXIT:
1482             status = ERR;
1483             break;
1484 
1485           case CONFIRM: {
1486             status = OK;
1487             if ((cs->selected != -1) || (cs->lenght > 0 && first_selected)) {
1488               // if there is something selected expand it and return
1489               int index = cs->selected == -1 ? 0 : cs->selected;
1490               struct completion *c = cs->completions;
1491               while (true) {
1492                 if (index == 0)
1493                   break;
1494                 c = c->next;
1495                 index--;
1496               }
1497               char *t = c->rcompletion;
1498               free(text);
1499               text = strdup(t);
1500               if (text == nil) {
1501                 fprintf(stderr, "Memory allocation error\n");
1502                 status = ERR;
1503               }
1504               textlen = strlen(text);
1505             } else {
1506               if (!free_text) {
1507                 // cannot accept arbitrary text
1508                 status = LOOPING;
1509               }
1510             }
1511             break;
1512           }
1513 
1514           case PREV_COMPL: {
1515             complete(cs, first_selected, true, &text, &textlen, &status);
1516             break;
1517           }
1518 
1519           case NEXT_COMPL: {
1520             complete(cs, first_selected, false, &text, &textlen, &status);
1521             break;
1522           }
1523 
1524           case DEL_CHAR:
1525             popc(text);
1526             update_completions(cs, text, lines, vlines, first_selected);
1527             break;
1528 
1529           case DEL_WORD: {
1530             popw(text);
1531             update_completions(cs, text, lines, vlines, first_selected);
1532             break;
1533           }
1534 
1535           case DEL_LINE: {
1536             for (int i = 0; i < textlen; ++i)
1537               text[i] = 0;
1538             update_completions(cs, text, lines, vlines, first_selected);
1539             break;
1540           }
1541 
1542           case ADD_CHAR: {
1543             int str_len = strlen(input);
1544 
1545             // sometimes a strange key is pressed (i.e. ctrl alone),
1546             // so input will be empty. Don't need to update completion
1547             // in this case
1548             if (str_len == 0)
1549               break;
1550 
1551             for (int i = 0; i < str_len; ++i) {
1552               textlen = pushc(&text, textlen, input[i]);
1553               if (textlen == -1) {
1554                 fprintf(stderr, "Memory allocation error\n");
1555                 status = ERR;
1556                 break;
1557               }
1558             }
1559             if (status != ERR) {
1560               update_completions(cs, text, lines, vlines, first_selected);
1561               free(input);
1562             }
1563             break;
1564           }
1565 
1566           case TOGGLE_FIRST_SELECTED:
1567             first_selected = !first_selected;
1568             if (first_selected && cs->selected < 0)
1569               cs->selected = 0;
1570             if (!first_selected && cs->selected == 0)
1571               cs->selected = -1;
1572             break;
1573         }
1574       }
1575     }
1576 
1577     draw(&r, text, cs);
1578   }
1579 
1580   if (status == OK)
1581     printf("%s\n", text);
1582 
1583   release_keyboard(r.d);
1584 
1585 #ifdef USE_XFT
1586   XftColorFree(r.d, DefaultVisual(r.d, 0), DefaultColormap(r.d, 0), &r.xft_prompt);
1587   XftColorFree(r.d, DefaultVisual(r.d, 0), DefaultColormap(r.d, 0), &r.xft_completion);
1588   XftColorFree(r.d, DefaultVisual(r.d, 0), DefaultColormap(r.d, 0), &r.xft_completion_highlighted);
1589 #endif
1590 
1591   free(ps1);
1592   free(fontname);
1593   free(text);
1594 
1595   char *l = nil;
1596   char **lns = lines;
1597   while ((l = *lns) != nil) {
1598     free(l);
1599     ++lns;
1600   }
1601 
1602   free(lines);
1603   free(vlines);
1604   compls_delete(cs);
1605 
1606   XDestroyWindow(r.d, r.w);
1607   XCloseDisplay(r.d);
1608 
1609   return status != OK;
1610 }