path: root/dmenu.c

/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <locale.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xresource.h>
#include <X11/Xutil.h>
#ifdef XINERAMA
#include <X11/extensions/Xinerama.h>
#endif
#include <X11/Xft/Xft.h>

#include "drw.h"
#include "util.h"

/* macros */
#define INTERSECT(x, y, w, h, r)                                               \
  (MAX(0, MIN((x) + (w), (r).x_org + (r).width) - MAX((x), (r).x_org)) *       \
   MAX(0, MIN((y) + (h), (r).y_org + (r).height) - MAX((y), (r).y_org)))
#define LENGTH(X) (sizeof X / sizeof X[0])
#define TEXTW(X) (drw_fontset_getwidth(drw, (X)) + lrpad)
#define NUMBERSMAXDIGITS 100
#define NUMBERSBUFSIZE (NUMBERSMAXDIGITS * 2) + 1

/* enums */
enum {
  SchemeNorm,
  SchemeSel,
  SchemeNormHighlight,
  SchemeSelHighlight,
  SchemeOut,
  SchemeLast
}; /* color schemes */

struct item {
  char *text;
  char *text_output;
  struct item *left, *right;
  int out;
  double distance;
};

static char numbers[NUMBERSBUFSIZE] = "";
static char text[BUFSIZ] = "";
static char *embed;
static char separator;
static int separator_greedy;
static int separator_reverse;
static int bh, mw, mh;
static int inputw = 0, promptw;
static int lrpad; /* sum of left and right padding */
static size_t cursor;
static struct item *items = NULL;
static struct item *matches, *matchend;
static struct item *prev, *curr, *next, *sel;
static int mon = -1, screen;
static unsigned int max_lines = 0;

static Atom clip, utf8;
static Display *dpy;
static Window root, parentwin, win;
static XIC xic;

static Drw *drw;
static Clr *scheme[SchemeLast];

/* Xresources preferences */
enum resource_type { STRING = 0, INTEGER = 1, FLOAT = 2 };
typedef struct {
  char *name;
  enum resource_type type;
  void *dst;
} ResourcePref;

static void load_xresources(void);
static void resource_load(XrmDatabase db, char *name, enum resource_type rtype,
                          void *dst);

#include "config.h"

/* static int (*fstrncmp)(const char *, const char *, size_t) = strncmp; */
/* static char *(*fstrstr)(const char *, const char *) = strstr; */
static char *cistrstr(const char *s, const char *sub);
static int (*fstrncmp)(const char *, const char *, size_t) = strncasecmp;
static char *(*fstrstr)(const char *, const char *) = cistrstr;

static void appenditem(struct item *item, struct item **list,
                       struct item **last) {
  if (*last)
    (*last)->right = item;
  else
    *list = item;

  item->left = *last;
  item->right = NULL;
  *last = item;
}

static void calcoffsets(void) {
  int i, n;

  if (lines > 0)
    /* n = lines * bh; */
    n = lines * columns * bh;
  else
    n = mw - (promptw + inputw + TEXTW("<") + TEXTW(">"));
  /* calculate which items will begin the next page and previous page */
  for (i = 0, next = curr; next; next = next->right)
    if ((i += (lines > 0) ? bh : MIN(TEXTW(next->text), n)) > n)
      break;
  for (i = 0, prev = curr; prev && prev->left; prev = prev->left)
    if ((i += (lines > 0) ? bh : MIN(TEXTW(prev->left->text), n)) > n)
      break;
}

static int max_textw(void) {
  int len = 0;
  for (struct item *item = items; item && item->text; item++)
    len = MAX(TEXTW(item->text), len);
  return len;
}

static void cleanup(void) {
  size_t i;

  XUngrabKey(dpy, AnyKey, AnyModifier, root);
  for (i = 0; i < SchemeLast; i++)
    free(scheme[i]);
  drw_free(drw);
  XSync(dpy, False);
  XCloseDisplay(dpy);
}

static char *cistrstr(const char *h, const char *n) {
  size_t i;

  if (!n[0])
    return (char *)h;

  for (; *h; ++h) {
    for (i = 0;
         n[i] && tolower((unsigned char)n[i]) == tolower((unsigned char)h[i]);
         ++i)
      ;
    if (n[i] == '\0')
      return (char *)h;
  }
  return NULL;
}

static void drawhighlights(struct item *item, int x, int y, int maxw) {
  int i, indent;
  char *highlight;
  char c;

  if (!(strlen(item->text) && strlen(text)))
    return;

  drw_setscheme(drw,
                scheme[item == sel ? SchemeSelHighlight : SchemeNormHighlight]);
  for (i = 0, highlight = item->text; *highlight && text[i];) {
    if (*highlight == text[i]) {
      /* get indentation */
      c = *highlight;
      *highlight = '\0';
      indent = TEXTW(item->text);
      *highlight = c;

      /* highlight character */
      c = highlight[1];
      highlight[1] = '\0';
      drw_text(drw, x + indent - (lrpad / 2), y,
               MIN(maxw - indent, TEXTW(highlight) - lrpad), bh, 0, highlight,
               0);
      highlight[1] = c;
      i++;
    }
    highlight++;
  }
}

static int drawitem(struct item *item, int x, int y, int w) {
  int r;
  if (item == sel)
    drw_setscheme(drw, scheme[SchemeSel]);
  else if (item->out)
    drw_setscheme(drw, scheme[SchemeOut]);
  else
    drw_setscheme(drw, scheme[SchemeNorm]);

  r = drw_text(drw, x, y, w, bh, lrpad / 2, item->text, 0);
  drawhighlights(item, x, y, w);
  return r;
}

static void recalculatenumbers() {
  unsigned int numer = 0, denom = 0;
  struct item *item;
  if (matchend) {
    numer++;
    for (item = matchend; item && item->left; item = item->left)
      numer++;
  }
  for (item = items; item && item->text; item++)
    denom++;
  snprintf(numbers, NUMBERSBUFSIZE, "%d/%d", numer, denom);
}

static void drawmenu(void) {
  unsigned int curpos;
  struct item *item;
  int x = 0, y = 0, w;

  drw_setscheme(drw, scheme[SchemeNorm]);
  drw_rect(drw, 0, 0, mw, mh, 1, 1);

  if (prompt && *prompt) {
    drw_setscheme(drw, scheme[SchemeSel]);
    x = drw_text(drw, x, 0, promptw, bh, lrpad / 2, prompt, 0);
  }
  /* draw input field */
  w = (lines > 0 || !matches) ? mw - x : inputw;
  drw_setscheme(drw, scheme[SchemeNorm]);
  drw_text(drw, x, 0, w, bh, lrpad / 2, text, 0);

  curpos = TEXTW(text) - TEXTW(&text[cursor]);
  if ((curpos += lrpad / 2 - 1) < w) {
    drw_setscheme(drw, scheme[SchemeNorm]);
    drw_rect(drw, x + curpos, 2, 2, bh - 4, 1, 0);
  }

  recalculatenumbers();
  if (lines > 0) {
    /* draw grid */
    int i = 0;
    for (item = curr; item != next; item = item->right, i++)
      drawitem(item, x + ((i / lines) * ((mw - x) / columns)),
               y + (((i % lines) + 1) * bh), (mw - x) / columns);
  } else if (matches) {
    /* draw horizontal list */
    x += inputw;
    w = TEXTW("<");
    if (curr->left) {
      drw_setscheme(drw, scheme[SchemeNorm]);
      drw_text(drw, x, 0, w, bh, lrpad / 2, "<", 0);
    }
    x += w;
    for (item = curr; item != next; item = item->right)
      /* x = drawitem(item, x, 0, MIN(TEXTW(item->text), mw - x - TEXTW(">")));
       */
      x = drawitem(
          item, x, 0,
          MIN(TEXTW(item->text), mw - x - TEXTW(">") - TEXTW(numbers)));
    if (next) {
      w = TEXTW(">");
      drw_setscheme(drw, scheme[SchemeNorm]);
      /* drw_text(drw, mw - w, 0, w, bh, lrpad / 2, ">", 0); */
      drw_text(drw, mw - w - TEXTW(numbers), 0, w, bh, lrpad / 2, ">", 0);
    }
  }
  drw_setscheme(drw, scheme[SchemeNorm]);
  drw_text(drw, mw - TEXTW(numbers), 0, TEXTW(numbers), bh, lrpad / 2, numbers,
           0);
  drw_map(drw, win, 0, 0, mw, mh);
}

static void grabfocus(void) {
  struct timespec ts = {.tv_sec = 0, .tv_nsec = 10000000};
  Window focuswin;
  int i, revertwin;

  for (i = 0; i < 100; ++i) {
    XGetInputFocus(dpy, &focuswin, &revertwin);
    if (focuswin == win)
      return;
    XSetInputFocus(dpy, win, RevertToParent, CurrentTime);
    nanosleep(&ts, NULL);
  }
  die("cannot grab focus");
}

static void grabkeyboard(void) {
  struct timespec ts = {.tv_sec = 0, .tv_nsec = 1000000};
  int i;

  if (embed)
    return;
  /* try to grab keyboard, we may have to wait for another process to ungrab */
  for (i = 0; i < 1000; i++) {
    if (XGrabKeyboard(dpy, DefaultRootWindow(dpy), True, GrabModeAsync,
                      GrabModeAsync, CurrentTime) == GrabSuccess)
      return;
    nanosleep(&ts, NULL);
  }
  die("cannot grab keyboard");
}

static void readstdin(FILE *stream);

static void refreshoptions() {
  int dynlen = strlen(dynamic);
  int cmdlen = dynlen + 4;
  char *cmd;
  char *c;
  char *t = text;
  while (*t)
    cmdlen += *t++ == '\'' ? 4 : 1;
  cmd = malloc(cmdlen);
  if (cmd == NULL)
    die("cannot malloc %u bytes:", cmdlen);
  strcpy(cmd, dynamic);
  t = text;
  c = cmd + dynlen;
  *(c++) = ' ';
  *(c++) = '\'';
  while (*t) {
    // prefix ' with '\'
    if (*t == '\'') {
      *(c++) = '\'';
      *(c++) = '\\';
      *(c++) = '\'';
    }
    *(c++) = *(t++);
  }
  *(c++) = '\'';
  *(c++) = 0;
  FILE *stream = popen(cmd, "r");
  if (!stream)
    die("could not popen dynamic command (%s):", cmd);
  readstdin(stream);
  int r = pclose(stream);
  if (r == -1)
    die("could not pclose dynamic command");
  free(cmd);
}

int compare_distance(const void *a, const void *b) {
  struct item *da = *(struct item **)a;
  struct item *db = *(struct item **)b;

  if (!db)
    return 1;
  if (!da)
    return -1;

  return da->distance == db->distance  ? 0
         : da->distance < db->distance ? -1
                                       : 1;
}

void fuzzymatch(void) {
  /* bang - we have so much memory */
  struct item *it;
  struct item **fuzzymatches = NULL;
  char c;
  int number_of_matches = 0, i, pidx, sidx, eidx;
  int text_len = strlen(text), itext_len;

  matches = matchend = NULL;

  /* walk through all items */
  for (it = items; it && it->text; it++) {
    if (text_len) {
      itext_len = strlen(it->text);
      pidx = 0;         /* pointer */
      sidx = eidx = -1; /* start of match, end of match */
      /* walk through item text */
      for (i = 0; i < itext_len && (c = it->text[i]); i++) {
        /* fuzzy match pattern */
        if (!fstrncmp(&text[pidx], &c, 1)) {
          if (sidx == -1)
            sidx = i;
          pidx++;
          if (pidx == text_len) {
            eidx = i;
            break;
          }
        }
      }
      /* build list of matches */
      if (eidx != -1) {
        /* compute distance */
        /* add penalty if match starts late (log(sidx+2))
         * add penalty for long a match without many matching characters */
        it->distance = log(sidx + 2) + (double)(eidx - sidx - text_len);
        /* fprintf(stderr, "distance %s %f\n", it->text, it->distance); */
        appenditem(it, &matches, &matchend);
        number_of_matches++;
      }
    } else {
      appenditem(it, &matches, &matchend);
    }
  }

  if (number_of_matches) {
    /* initialize array with matches */
    if (!(fuzzymatches =
              realloc(fuzzymatches, number_of_matches * sizeof(struct item *))))
      die("cannot realloc %u bytes:",
          number_of_matches * sizeof(struct item *));
    for (i = 0, it = matches; it && i < number_of_matches;
         i++, it = it->right) {
      fuzzymatches[i] = it;
    }
    /* sort matches according to distance */
    qsort(fuzzymatches, number_of_matches, sizeof(struct item *),
          compare_distance);
    /* rebuild list of matches */
    matches = matchend = NULL;
    for (i = 0, it = fuzzymatches[i]; i < number_of_matches && it && it->text;
         i++, it = fuzzymatches[i]) {
      appenditem(it, &matches, &matchend);
    }
    free(fuzzymatches);
  }
  curr = sel = matches;
  calcoffsets();
}

static void match(void) {
  if (fuzzy) {
    fuzzymatch();
    return;
  }
  static char **tokv = NULL;
  static int tokn = 0;

  char buf[sizeof text], *s;
  int i, tokc = 0;
  size_t len, textsize;
  struct item *item, *lprefix, *lsubstr, *prefixend, *substrend;

  if (dynamic) {
    refreshoptions();
    matches = matchend = NULL;
    for (item = items; item && item->text; item++)
      appenditem(item, &matches, &matchend);
    curr = sel = matches;
    calcoffsets();
    return;
  }

  strcpy(buf, text);
  /* separate input text into tokens to be matched individually */
  for (s = strtok(buf, " "); s; tokv[tokc - 1] = s, s = strtok(NULL, " "))
    if (++tokc > tokn && !(tokv = realloc(tokv, ++tokn * sizeof *tokv)))
      die("cannot realloc %u bytes:", tokn * sizeof *tokv);
  len = tokc ? strlen(tokv[0]) : 0;

  matches = lprefix = lsubstr = matchend = prefixend = substrend = NULL;
  textsize = strlen(text) + 1;
  for (item = items; item && item->text; item++) {
    for (i = 0; i < tokc; i++)
      if (!fstrstr(item->text, tokv[i]))
        break;
    if (i != tokc) /* not all tokens match */
      continue;
    /* exact matches go first, then prefixes, then substrings */
    if (!tokc || !fstrncmp(text, item->text, textsize))
      appenditem(item, &matches, &matchend);
    else if (!fstrncmp(tokv[0], item->text, len))
      appenditem(item, &lprefix, &prefixend);
    else
      appenditem(item, &lsubstr, &substrend);
  }
  if (lprefix) {
    if (matches) {
      matchend->right = lprefix;
      lprefix->left = matchend;
    } else
      matches = lprefix;
    matchend = prefixend;
  }
  if (lsubstr) {
    if (matches) {
      matchend->right = lsubstr;
      lsubstr->left = matchend;
    } else
      matches = lsubstr;
    matchend = substrend;
  }
  curr = sel = matches;
  calcoffsets();
}

static void insert(const char *str, ssize_t n) {
  if (strlen(text) + n > sizeof text - 1)
    return;
  /* move existing text out of the way, insert new text, and update cursor */
  memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
  if (n > 0)
    memcpy(&text[cursor], str, n);
  cursor += n;
  match();
}

static size_t nextrune(int inc) {
  ssize_t n;

  /* return location of next utf8 rune in the given direction (+1 or -1) */
  for (n = cursor + inc; n + inc >= 0 && (text[n] & 0xc0) == 0x80; n += inc)
    ;
  return n;
}

static void movewordedge(int dir) {
  if (dir < 0) { /* move cursor to the start of the word*/
    while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))
      cursor = nextrune(-1);
    while (cursor > 0 && !strchr(worddelimiters, text[nextrune(-1)]))
      cursor = nextrune(-1);
  } else { /* move cursor to the end of the word */
    while (text[cursor] && strchr(worddelimiters, text[cursor]))
      cursor = nextrune(+1);
    while (text[cursor] && !strchr(worddelimiters, text[cursor]))
      cursor = nextrune(+1);
  }
}

static void keypress(XKeyEvent *ev) {
  char buf[32];
  int len;
  KeySym ksym;
  Status status;
  int i, offscreen = 0;
  struct item *tmpsel;

  len = XmbLookupString(xic, ev, buf, sizeof buf, &ksym, &status);
  switch (status) {
  default: /* XLookupNone, XBufferOverflow */
    return;
  case XLookupChars:
    goto insert;
  case XLookupKeySym:
  case XLookupBoth:
    break;
  }

  if (ev->state & ControlMask) {
    switch (ksym) {
    case XK_a:
      ksym = XK_Home;
      break;
    case XK_b:
      ksym = XK_Left;
      break;
    case XK_c:
      ksym = XK_Escape;
      break;
    case XK_d:
      ksym = XK_Delete;
      break;
    case XK_e:
      ksym = XK_End;
      break;
    case XK_f:
      ksym = XK_Right;
      break;
    case XK_g:
      ksym = XK_Escape;
      break;
    case XK_h:
      ksym = XK_BackSpace;
      break;
    case XK_i:
      ksym = XK_Tab;
      break;
    case XK_j: /* fallthrough */
    case XK_J: /* fallthrough */
    case XK_m: /* fallthrough */
    case XK_M:
      ksym = XK_Return;
      ev->state &= ~ControlMask;
      break;
    case XK_n:
      ksym = XK_Down;
      break;
    case XK_p:
      ksym = XK_Up;
      break;

    case XK_k: /* delete right */
      text[cursor] = '\0';
      match();
      break;
    case XK_u: /* delete left */
      insert(NULL, 0 - cursor);
      break;
    case XK_w: /* delete word */
      while (cursor > 0 && strchr(worddelimiters, text[nextrune(-1)]))
        insert(NULL, nextrune(-1) - cursor);
      while (cursor > 0 && !strchr(worddelimiters, text[nextrune(-1)]))
        insert(NULL, nextrune(-1) - cursor);
      break;
    case XK_y: /* paste selection */
    case XK_Y:
      XConvertSelection(dpy, (ev->state & ShiftMask) ? clip : XA_PRIMARY, utf8,
                        utf8, win, CurrentTime);
      return;
    case XK_Left:
    case XK_KP_Left:
      movewordedge(-1);
      goto draw;
    case XK_Right:
    case XK_KP_Right:
      movewordedge(+1);
      goto draw;
    case XK_Return:
    case XK_KP_Enter:
      break;
    case XK_bracketleft:
      cleanup();
      exit(1);
    default:
      return;
    }
  } else if (ev->state & Mod1Mask) {
    switch (ksym) {
    case XK_b:
      movewordedge(-1);
      goto draw;
    case XK_f:
      movewordedge(+1);
      goto draw;
    case XK_g:
      ksym = XK_Home;
      break;
    case XK_G:
      ksym = XK_End;
      break;
    case XK_h:
      ksym = XK_Up;
      break;
    case XK_j:
      ksym = XK_Next;
      break;
    case XK_k:
      ksym = XK_Prior;
      break;
    case XK_l:
      ksym = XK_Down;
      break;
    default:
      return;
    }
  }

  switch (ksym) {
  default:
  insert:
    if (!iscntrl(*buf))
      insert(buf, len);
    break;
  case XK_Delete:
  case XK_KP_Delete:
    if (text[cursor] == '\0')
      return;
    cursor = nextrune(+1);
    /* fallthrough */
  case XK_BackSpace:
    if (cursor == 0)
      return;
    insert(NULL, nextrune(-1) - cursor);
    break;
  case XK_End:
  case XK_KP_End:
    if (text[cursor] != '\0') {
      cursor = strlen(text);
      break;
    }
    if (next) {
      /* jump to end of list and position items in reverse */
      curr = matchend;
      calcoffsets();
      curr = prev;
      calcoffsets();
      while (next && (curr = curr->right))
        calcoffsets();
    }
    sel = matchend;
    break;
  case XK_Escape:
    cleanup();
    exit(1);
  case XK_Home:
  case XK_KP_Home:
    if (sel == matches) {
      cursor = 0;
      break;
    }
    sel = curr = matches;
    calcoffsets();
    break;
  case XK_Left:
    if (columns > 1) {
      if (!sel)
        return;
      tmpsel = sel;
      for (i = 0; i < lines; i++) {
        if (!tmpsel->left || tmpsel->left->right != tmpsel) {
          if (offscreen)
            break;
          return;
        }
        if (tmpsel == curr)
          offscreen = 1;
        tmpsel = tmpsel->left;
      }
      sel = tmpsel;
      if (offscreen) {
        curr = prev;
        calcoffsets();
      }
      break;
    }
  case XK_KP_Left:
    if (cursor > 0 && (!sel || !sel->left || lines > 0)) {
      cursor = nextrune(-1);
      break;
    }
    if (lines > 0)
      return;
    /* fallthrough */
  case XK_Up:
  case XK_KP_Up:
    if (sel && sel->left && (sel = sel->left)->right == curr) {
      curr = prev;
      calcoffsets();
    }
    break;
  case XK_Next:
  case XK_KP_Next:
    if (!next)
      return;
    sel = curr = next;
    calcoffsets();
    break;
  case XK_Prior:
  case XK_KP_Prior:
    if (!prev)
      return;
    sel = curr = prev;
    calcoffsets();
    break;
  case XK_Return:
  case XK_KP_Enter:
    puts((sel && !(ev->state & ShiftMask)) ? sel->text_output : text);
    if (!(ev->state & ControlMask)) {
      cleanup();
      exit(0);
    }
    if (sel)
      sel->out = 1;
    break;
  case XK_Right:
    if (columns > 1) {
      if (!sel)
        return;
      tmpsel = sel;
      for (i = 0; i < lines; i++) {
        if (!tmpsel->right || tmpsel->right->left != tmpsel) {
          if (offscreen)
            break;
          return;
        }
        tmpsel = tmpsel->right;
        if (tmpsel == next)
          offscreen = 1;
      }
      sel = tmpsel;
      if (offscreen) {
        curr = next;
        calcoffsets();
      }
      break;
    }
  case XK_KP_Right:
    if (text[cursor] != '\0') {
      cursor = nextrune(+1);
      break;
    }
    if (lines > 0)
      return;
    /* fallthrough */
  case XK_Down:
  case XK_KP_Down:
    if (sel && sel->right && (sel = sel->right) == next) {
      curr = next;
      calcoffsets();
    }
    break;
  case XK_Tab:
    if (!sel)
      return;
    strncpy(text, sel->text, sizeof text - 1);
    text[sizeof text - 1] = '\0';
    cursor = strlen(text);
    match();
    break;
  }

draw:
  drawmenu();
}

static void paste(void) {
  char *p, *q;
  int di;
  unsigned long dl;
  Atom da;

  /* we have been given the current selection, now insert it into input */
  if (XGetWindowProperty(dpy, win, utf8, 0, (sizeof text / 4) + 1, False, utf8,
                         &da, &di, &dl, &dl, (unsigned char **)&p) == Success &&
      p) {
    insert(p, (q = strchr(p, '\n')) ? q - p : (ssize_t)strlen(p));
    XFree(p);
  }
  drawmenu();
}

static void readstdin(FILE *stream) {
  char buf[sizeof text], *p;
  size_t i, imax = 0, size = 0;
  unsigned int tmpmax = 0;

  /* read each line from stdin and add it to the item list */
  for (i = 0; fgets(buf, sizeof buf, stream); i++) {
    if (i + 1 >= size / sizeof *items)
      if (!(items = realloc(items, (size += BUFSIZ))))
        die("cannot realloc %u bytes:", size);
    if ((p = strchr(buf, '\n')))
      *p = '\0';
    if (!(items[i].text = strdup(buf)))
      die("cannot strdup %u bytes:", strlen(buf) + 1);
    if (separator &&
        (p = separator_greedy ? strrchr(items[i].text, separator)
                              : strchr(items[i].text, separator))) {
      *p = '\0';
      items[i].text_output = ++p;
    } else {
      items[i].text_output = items[i].text;
    }
    if (separator_reverse) {
      p = items[i].text;
      items[i].text = items[i].text_output;
      items[i].text_output = p;
    }
    items[i].out = 0;
    drw_font_getexts(drw->fonts, buf, strlen(buf), &tmpmax, NULL);
    if (tmpmax > inputw) {
      inputw = tmpmax;
      imax = i;
    }
  }
  if (items)
    items[i].text = NULL;
  inputw = items ? TEXTW(items[imax].text) : 0;
  lines = MIN(max_lines, i);
}

void resource_load(XrmDatabase db, char *name, enum resource_type rtype,
                   void *dst) {
  char *sdst = NULL;
  int *idst = NULL;
  float *fdst = NULL;
  sdst = dst;
  idst = dst;
  fdst = dst;
  char fullname[256];
  char *type;
  XrmValue ret;
  snprintf(fullname, sizeof(fullname), "%s.%s", "dmenu", name);
  fullname[sizeof(fullname) - 1] = '\0';
  XrmGetResource(db, fullname, "*", &type, &ret);
  if (!(ret.addr == NULL || strncmp("String", type, 64))) {
    switch (rtype) {
    case STRING:
      strcpy(sdst, ret.addr);
      break;
    case INTEGER:
      *idst = strtoul(ret.addr, NULL, 10);
      break;
    case FLOAT:
      *fdst = strtof(ret.addr, NULL);
      break;
    }
  }
}

void load_xresources(void) {
  Display *display;
  char *resm;
  XrmDatabase db;
  ResourcePref *p;
  display = XOpenDisplay(NULL);
  resm = XResourceManagerString(display);
  if (!resm)
    return;
  db = XrmGetStringDatabase(resm);
  for (p = resources; p < resources + LENGTH(resources); p++)
    resource_load(db, p->name, p->type, p->dst);
  XCloseDisplay(display);
}

static void run(void) {
  XEvent ev;

  while (!XNextEvent(dpy, &ev)) {
    if (XFilterEvent(&ev, win))
      continue;
    switch (ev.type) {
    case DestroyNotify:
      if (ev.xdestroywindow.window != win)
        break;
      cleanup();
      exit(1);
    case Expose:
      if (ev.xexpose.count == 0)
        drw_map(drw, win, 0, 0, mw, mh);
      break;
    case FocusIn:
      /* regrab focus from parent window */
      if (ev.xfocus.window != win)
        grabfocus();
      break;
    case KeyPress:
      keypress(&ev.xkey);
      break;
    case SelectionNotify:
      if (ev.xselection.property == utf8)
        paste();
      break;
    case VisibilityNotify:
      if (ev.xvisibility.state != VisibilityUnobscured)
        XRaiseWindow(dpy, win);
      break;
    }
  }
}

static void setup(void) {
  int x, y, i, j;
  unsigned int du;
  XSetWindowAttributes swa;
  XIM xim;
  Window w, dw, *dws;
  XWindowAttributes wa;
  XClassHint ch = {"dmenu", "dmenu"};
#ifdef XINERAMA
  XineramaScreenInfo *info;
  Window pw;
  int a, di, n, area = 0;
#endif
  /* init appearance */
  for (j = 0; j < SchemeLast; j++)
    scheme[j] = drw_scm_create(drw, colors[j], 2);

  clip = XInternAtom(dpy, "CLIPBOARD", False);
  utf8 = XInternAtom(dpy, "UTF8_STRING", False);

  /* calculate menu geometry */
  bh = drw->fonts->h + 2;
  lines = MAX(lines, 0);
  mh = (lines + 1) * bh;
  promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;
#ifdef XINERAMA
  i = 0;
  if (parentwin == root && (info = XineramaQueryScreens(dpy, &n))) {
    XGetInputFocus(dpy, &w, &di);
    if (mon >= 0 && mon < n)
      i = mon;
    else if (w != root && w != PointerRoot && w != None) {
      /* find top-level window containing current input focus */
      do {
        if (XQueryTree(dpy, (pw = w), &dw, &w, &dws, &du) && dws)
          XFree(dws);
      } while (w != root && w != pw);
      /* find xinerama screen with which the window intersects most */
      if (XGetWindowAttributes(dpy, pw, &wa))
        for (j = 0; j < n; j++)
          if ((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) >
              area) {
            area = a;
            i = j;
          }
    }
    /* no focused window is on screen, so use pointer location instead */
    if (mon < 0 && !area &&
        XQueryPointer(dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
      for (i = 0; i < n; i++)
        if (INTERSECT(x, y, 1, 1, info[i]))
          break;

    /* x = info[i].x_org; */
    /* y = info[i].y_org + (topbar ? 0 : info[i].height - mh); */
    /* mw = info[i].width; */
    mw = MIN(MAX(max_textw() + promptw, 100), info[i].width);
    x = info[i].x_org + ((info[i].width - mw) / 2);
    y = info[i].y_org + ((info[i].height - mh) / 2);
    XFree(info);
  } else
#endif
  {
    if (!XGetWindowAttributes(dpy, parentwin, &wa))
      die("could not get embedding window attributes: 0x%lx", parentwin);
    /* x = 0; */
    /* y = topbar ? 0 : wa.height - mh; */
    /* mw = wa.width; */
    mw = MIN(MAX(max_textw() + promptw, 100), wa.width);
    x = (wa.width - mw) / 2;
    y = (wa.height - mh) / 2;
  }
  promptw = (prompt && *prompt) ? TEXTW(prompt) - lrpad / 4 : 0;
  inputw = MIN(inputw, mw / 3);
  match();

  /* create menu window */
  swa.override_redirect = True;
  swa.background_pixel = scheme[SchemeNorm][ColBg].pixel;
  swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
  /* win = XCreateWindow(dpy, parentwin, x, y, mw, mh, 0, */
  win = XCreateWindow(dpy, parentwin, x, y, mw, mh, border_width,
                      CopyFromParent, CopyFromParent, CopyFromParent,
                      CWOverrideRedirect | CWBackPixel | CWEventMask, &swa);
  XSetWindowBorder(dpy, win, scheme[SchemeSel][ColBg].pixel);
  XSetClassHint(dpy, win, &ch);

  /* input methods */
  if ((xim = XOpenIM(dpy, NULL, NULL, NULL)) == NULL)
    die("XOpenIM failed: could not open input device");

  xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
                  XNClientWindow, win, XNFocusWindow, win, NULL);

  XMapRaised(dpy, win);
  if (embed) {
    XSelectInput(dpy, parentwin, FocusChangeMask | SubstructureNotifyMask);
    if (XQueryTree(dpy, parentwin, &dw, &w, &dws, &du) && dws) {
      for (i = 0; i < du && dws[i] != win; ++i)
        XSelectInput(dpy, dws[i], FocusChangeMask);
      XFree(dws);
    }
    grabfocus();
  }
  drw_resize(drw, mw, mh);
  drawmenu();
}

static void usage(void) {
  fputs("usage: dmenu [-bfiv] [-l lines] [-p prompt] [-fn font] [-m monitor]\n"
        "             [-nb color] [-nf color] [-sb color] [-sf color]\n"
        "             [-nhb color] [-nhf color] [-shb color] [-shf color]\n"
        "             [-d separator] [-D separator] [-dy command] [-w "
        "windowid]\n",
        stderr);
  exit(1);
}

int main(int argc, char *argv[]) {
  XWindowAttributes wa;
  int i, fast = 0;

  XrmInitialize();
  load_xresources();

  for (i = 1; i < argc; i++)
    /* these options take no arguments */
    if (!strcmp(argv[i], "-v")) { /* prints version information */
      puts("dmenu-" VERSION);
      exit(0);
    } else if (!strcmp(argv[i], "-b")) /* appears at the bottom of the screen */
      topbar = 0;
    else if (!strcmp(argv[i], "-f")) /* grabs keyboard before reading stdin */
      fast = 1;
    else if (!strcmp(argv[i], "-F")) /* grabs keyboard before reading stdin */
      fuzzy = 0;
    else if (!strcmp(argv[i], "-s")) { /* case-sensitive item matching */
      fstrncmp = strncmp;
      fstrstr = strstr;
    } else if (i + 1 == argc)
      usage();
    /* these options take one argument */
    else if (!strcmp(argv[i], "-g")) { /* number of columns in grid */
      columns = atoi(argv[++i]);
      if (lines == 0)
        lines = 1;
    } else if (!strcmp(argv[i], "-l")) { /* number of lines in grid */
      lines = atoi(argv[++i]);
      if (columns == 0)
        columns = 1;
    } else if (!strcmp(argv[i], "-m"))
      mon = atoi(argv[++i]);
    else if (!strcmp(argv[i], "-p")) /* adds prompt to left of input field */
      prompt = argv[++i];
    else if (!strcmp(argv[i], "-fn")) /* font or font set */
      fonts[0] = argv[++i];
    else if (!strcmp(argv[i], "-nb")) /* normal background color */
      colors[SchemeNorm][ColBg] = argv[++i];
    else if (!strcmp(argv[i], "-nf")) /* normal foreground color */
      colors[SchemeNorm][ColFg] = argv[++i];
    else if (!strcmp(argv[i], "-sb")) /* selected background color */
      colors[SchemeSel][ColBg] = argv[++i];
    else if (!strcmp(argv[i], "-sf")) /* selected foreground color */
      colors[SchemeSel][ColFg] = argv[++i];
    else if (!strcmp(argv[i], "-nhb")) /* normal hi background color */
      colors[SchemeNormHighlight][ColBg] = argv[++i];
    else if (!strcmp(argv[i], "-nhf")) /* normal hi foreground color */
      colors[SchemeNormHighlight][ColFg] = argv[++i];
    else if (!strcmp(argv[i], "-shb")) /* selected hi background color */
      colors[SchemeSelHighlight][ColBg] = argv[++i];
    else if (!strcmp(argv[i], "-shf")) /* selected hi foreground color */
      colors[SchemeSelHighlight][ColFg] = argv[++i];
    else if (!strcmp(argv[i], "-d") || /* field separator */
             (separator_greedy = !strcmp(argv[i], "-D"))) {
      separator = argv[++i][0];
      separator_reverse = argv[i][1] == '|';
    } else if (!strcmp(argv[i], "-w")) /* embedding window id */
      embed = argv[++i];
    else if (!strcmp(argv[i], "-dy")) /* dynamic command to run */
      dynamic = argv[++i] && *argv[i] ? argv[i] : NULL;
    else
      usage();

  if (!setlocale(LC_CTYPE, "") || !XSupportsLocale())
    fputs("warning: no locale support\n", stderr);
  if (!(dpy = XOpenDisplay(NULL)))
    die("cannot open display");
  screen = DefaultScreen(dpy);
  root = RootWindow(dpy, screen);
  if (!embed || !(parentwin = strtol(embed, NULL, 0)))
    parentwin = root;
  if (!XGetWindowAttributes(dpy, parentwin, &wa))
    die("could not get embedding window attributes: 0x%lx", parentwin);
  drw = drw_create(dpy, screen, root, wa.width, wa.height);
  if (!drw_fontset_create(drw, fonts, LENGTH(fonts)))
    die("no fonts could be loaded.");
  lrpad = drw->fonts->h;

#ifdef __OpenBSD__
  if (pledge("stdio rpath", NULL) == -1)
    die("pledge");
#endif

  max_lines = lines;
  if (fast && !isatty(0)) {
    grabkeyboard();
    if (!dynamic)
      readstdin(stdin);
  } else {
    if (!dynamic)
      readstdin(stdin);
    grabkeyboard();
  }
  setup();
  run();

  return 1; /* unreachable */
}