dmenu/dmenu.c

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C
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/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
#include <X11/Xatom.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
#ifdef XINERAMA
#include <X11/extensions/Xinerama.h>
#endif
#include <draw.h>
#define INRECT(x,y,rx,ry,rw,rh) ((x) >= (rx) && (x) < (rx)+(rw) && (y) >= (ry) && (y) < (ry)+(rh))
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define UTF8_CODEPOINT(c) (((c) & 0xc0) != 0x80)
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typedef struct Item Item;
struct Item {
char *text;
Item *next; /* traverses all items */
Item *left, *right; /* traverses matching items */
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};
static void appenditem(Item *item, Item **list, Item **last);
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static void calcoffsets(void);
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static char *cistrstr(const char *s, const char *sub);
static void drawmenu(void);
static void grabkeyboard(void);
static void insert(const char *s, ssize_t n);
static void keypress(XKeyEvent *e);
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static void match(void);
static void paste(void);
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static void readstdin(void);
static void run(void);
static void setup(void);
static void usage(void);
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static char text[4096];
static size_t cursor = 0;
static const char *prompt = NULL;
static const char *normbgcolor = "#cccccc";
static const char *normfgcolor = "#000000";
static const char *selbgcolor = "#0066ff";
static const char *selfgcolor = "#ffffff";
static unsigned int inputw = 0;
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static unsigned int lines = 0;
static unsigned int mw, mh;
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static unsigned int promptw;
static unsigned long normcol[ColLast];
static unsigned long selcol[ColLast];
static Atom utf8;
static Bool topbar = True;
static DC *dc;
static Item *allitems, *matches;
static Item *curr, *prev, *next, *sel;
static Window root, win;
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static int (*fstrncmp)(const char *, const char *, size_t) = strncmp;
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static char *(*fstrstr)(const char *, const char *) = strstr;
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void
appenditem(Item *item, Item **list, Item **last) {
if(!*last)
*list = item;
else
(*last)->right = item;
item->left = *last;
item->right = NULL;
*last = item;
}
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void
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calcoffsets(void)
{
unsigned int h, i, n;
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h = dc->font.height+2;
if(lines > 0)
n = lines * h;
else
n = mw - (promptw + inputw + textw(dc, "<") + textw(dc, ">"));
prev = next = curr;
for(i = 0; next; next = next->right)
if((i += (lines > 0) ? h : MIN(textw(dc, next->text), mw/3)) > n)
break;
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for(i = 0; prev && prev->left; prev = prev->left)
if((i += (lines > 0) ? h : MIN(textw(dc, prev->left->text), mw/3)) > n)
break;
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}
char *
cistrstr(const char *s, const char *sub) {
size_t len;
for(len = strlen(sub); *s; s++)
if(!strncasecmp(s, sub, len))
return (char *)s;
return NULL;
}
void
drawmenu(void) {
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Item *item;
dc->x = 0;
dc->y = 0;
drawrect(dc, 0, 0, mw, mh, BG(dc, normcol));
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dc->h = dc->font.height + 2;
dc->y = topbar ? 0 : mh - dc->h;
/* print prompt? */
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if(prompt) {
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dc->w = promptw;
drawtext(dc, prompt, selcol);
dc->x = dc->w;
}
dc->w = mw - dc->x;
/* print input area */
if(matches && lines == 0 && textw(dc, text) <= inputw)
dc->w = inputw;
drawtext(dc, text, normcol);
drawrect(dc, textnw(dc, text, cursor) + dc->h/2 - 2, 2, 1, dc->h - 4, FG(dc, normcol));
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if(lines > 0) {
dc->y = topbar ? dc->h : 0;
dc->w = mw - dc->x;
for(item = curr; item != next; item = item->right) {
drawtext(dc, item->text, (item == sel) ? selcol : normcol);
dc->y += dc->h;
}
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}
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else if(curr && (dc->w == inputw || curr->next)) {
dc->x += inputw;
dc->w = textw(dc, "<");
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if(curr->left)
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drawtext(dc, "<", normcol);
for(item = curr; item != next; item = item->right) {
dc->x += dc->w;
dc->w = MIN(textw(dc, item->text), mw/3);
drawtext(dc, item->text, (item == sel) ? selcol : normcol);
}
dc->w = textw(dc, ">");
dc->x = mw - dc->w;
if(next)
drawtext(dc, ">", normcol);
}
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commitdraw(dc, win);
}
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void
grabkeyboard(void) {
int i;
for(i = 0; i < 1000; i++) {
if(!XGrabKeyboard(dc->dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime))
return;
usleep(1000);
}
eprintf("cannot grab keyboard\n");
}
void
insert(const char *s, ssize_t n) {
memmove(text + cursor + n, text + cursor, sizeof text - cursor - n);
if(n > 0)
memcpy(text + cursor, s, n);
cursor += n;
match();
}
void
keypress(XKeyEvent *e) {
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char buf[sizeof text];
int n;
size_t len;
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KeySym ksym;
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len = strlen(text);
XLookupString(e, buf, sizeof buf, &ksym, NULL);
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if(e->state & ControlMask) {
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switch(tolower(ksym)) {
default:
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return;
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case XK_a:
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ksym = XK_Home;
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break;
case XK_b:
ksym = XK_Left;
break;
case XK_c:
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ksym = XK_Escape;
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break;
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case XK_e:
ksym = XK_End;
break;
case XK_f:
ksym = XK_Right;
break;
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case XK_h:
ksym = XK_BackSpace;
break;
case XK_i:
ksym = XK_Tab;
break;
case XK_j:
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case XK_m:
ksym = XK_Return;
break;
case XK_k: /* delete right */
text[cursor] = '\0';
match();
break;
case XK_n:
ksym = XK_Down;
break;
case XK_p:
ksym = XK_Up;
break;
case XK_u: /* delete left */
insert(NULL, -cursor);
break;
case XK_w: /* delete word */
if(cursor == 0)
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return;
n = 0;
while(cursor - n++ > 0 && text[cursor - n] == ' ');
while(cursor - n++ > 0 && text[cursor - n] != ' ');
insert(NULL, 1-n);
break;
case XK_y: /* paste selection */
XConvertSelection(dc->dpy, XA_PRIMARY, utf8, None, win, CurrentTime);
/* causes SelectionNotify event */
return;
}
}
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switch(ksym) {
default:
if(!iscntrl((int)*buf))
insert(buf, MIN(strlen(buf), sizeof text - cursor));
break;
case XK_BackSpace:
if(cursor == 0)
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return;
for(n = 1; cursor - n > 0 && !UTF8_CODEPOINT(text[cursor - n]); n++);
insert(NULL, -n);
break;
case XK_Delete:
if(cursor == len)
return;
for(n = 1; cursor + n < len && !UTF8_CODEPOINT(text[cursor + n]); n++);
cursor += n;
insert(NULL, -n);
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break;
case XK_End:
if(cursor < len) {
cursor = len;
break;
}
while(next) {
sel = curr = next;
calcoffsets();
}
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while(sel && sel->right)
sel = sel->right;
break;
case XK_Escape:
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exit(EXIT_FAILURE);
case XK_Home:
if(sel == matches) {
cursor = 0;
break;
}
sel = curr = matches;
calcoffsets();
break;
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case XK_Left:
if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
while(cursor-- > 0 && !UTF8_CODEPOINT(text[cursor]));
break;
}
else if(lines > 0)
return;
case XK_Up:
if(!sel || !sel->left)
return;
sel = sel->left;
if(sel->right == curr) {
curr = prev;
calcoffsets();
}
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break;
case XK_Next:
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if(!next)
return;
sel = curr = next;
calcoffsets();
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break;
case XK_Prior:
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if(!prev)
return;
sel = curr = prev;
calcoffsets();
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break;
case XK_Return:
case XK_KP_Enter:
fputs((sel && !(e->state & ShiftMask)) ? sel->text : text, stdout);
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fflush(stdout);
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exit(EXIT_SUCCESS);
case XK_Right:
if(cursor < len) {
while(cursor++ < len && !UTF8_CODEPOINT(text[cursor]));
break;
}
else if(lines > 0)
return;
case XK_Down:
if(!sel || !sel->right)
return;
sel = sel->right;
if(sel == next) {
curr = next;
calcoffsets();
}
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break;
case XK_Tab:
if(!sel)
return;
strncpy(text, sel->text, sizeof text);
cursor = strlen(text);
match();
break;
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}
drawmenu();
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}
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void
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match(void) {
unsigned int len;
Item *item, *itemend, *lexact, *lprefix, *lsubstr, *exactend, *prefixend, *substrend;
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len = strlen(text);
matches = lexact = lprefix = lsubstr = itemend = exactend = prefixend = substrend = NULL;
for(item = allitems; item; item = item->next)
if(!fstrncmp(text, item->text, len + 1))
appenditem(item, &lexact, &exactend);
else if(!fstrncmp(text, item->text, len))
appenditem(item, &lprefix, &prefixend);
else if(fstrstr(item->text, text))
appenditem(item, &lsubstr, &substrend);
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if(lexact) {
matches = lexact;
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itemend = exactend;
}
if(lprefix) {
if(itemend) {
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itemend->right = lprefix;
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lprefix->left = itemend;
}
else
matches = lprefix;
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itemend = prefixend;
}
if(lsubstr) {
if(itemend) {
itemend->right = lsubstr;
lsubstr->left = itemend;
}
else
matches = lsubstr;
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}
curr = prev = next = sel = matches;
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calcoffsets();
}
void
paste(void) {
char *p, *q;
int di;
unsigned long dl;
Atom da;
XGetWindowProperty(dc->dpy, win, utf8, 0, sizeof text - cursor, True,
utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
insert(p, (q = strchr(p, '\n')) ? q-p : strlen(p));
XFree(p);
drawmenu();
}
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void
readstdin(void) {
char buf[sizeof text], *p;
Item *item, *new;
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allitems = NULL;
for(item = NULL; fgets(buf, sizeof buf, stdin); item = new) {
if((p = strchr(buf, '\n')))
*p = '\0';
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if(!(new = malloc(sizeof *new)))
eprintf("cannot malloc %u bytes\n", sizeof *new);
if(!(new->text = strdup(buf)))
eprintf("cannot strdup %u bytes\n", strlen(buf));
inputw = MAX(inputw, textw(dc, new->text));
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new->next = new->left = new->right = NULL;
if(item)
item->next = new;
else
allitems = new;
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}
}
void
run(void) {
XEvent ev;
while(!XNextEvent(dc->dpy, &ev))
switch(ev.type) {
case Expose:
if(ev.xexpose.count == 0)
drawmenu();
break;
case KeyPress:
keypress(&ev.xkey);
break;
case SelectionNotify:
if(ev.xselection.property == utf8)
paste();
break;
case VisibilityNotify:
if(ev.xvisibility.state != VisibilityUnobscured)
XRaiseWindow(dc->dpy, win);
break;
}
}
void
setup(void) {
int x, y, screen;
XSetWindowAttributes wa;
#ifdef XINERAMA
int n;
XineramaScreenInfo *info;
#endif
screen = DefaultScreen(dc->dpy);
root = RootWindow(dc->dpy, screen);
utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
normcol[ColBG] = getcolor(dc, normbgcolor);
normcol[ColFG] = getcolor(dc, normfgcolor);
selcol[ColBG] = getcolor(dc, selbgcolor);
selcol[ColFG] = getcolor(dc, selfgcolor);
/* input window geometry */
mh = (dc->font.height + 2) * (lines + 1);
#ifdef XINERAMA
if((info = XineramaQueryScreens(dc->dpy, &n))) {
int i, di;
unsigned int du;
Window dw;
XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du);
for(i = 0; i < n; i++)
if(INRECT(x, y, info[i].x_org, info[i].y_org, info[i].width, info[i].height))
break;
x = info[i].x_org;
y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
mw = info[i].width;
XFree(info);
}
else
#endif
{
x = 0;
y = topbar ? 0 : DisplayHeight(dc->dpy, screen) - mh;
mw = DisplayWidth(dc->dpy, screen);
}
/* input window */
wa.override_redirect = True;
wa.background_pixmap = ParentRelative;
wa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
win = XCreateWindow(dc->dpy, root, x, y, mw, mh, 0,
DefaultDepth(dc->dpy, screen), CopyFromParent,
DefaultVisual(dc->dpy, screen),
CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
grabkeyboard();
setcanvas(dc, win, mw, mh);
inputw = MIN(inputw, mw/3);
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promptw = prompt ? MIN(textw(dc, prompt), mw/5) : 0;
XMapRaised(dc->dpy, win);
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text[0] = '\0';
match();
}
void
usage(void) {
fputs("usage: dmenu [-b] [-i] [-l lines] [-p prompt] [-fn font] [-nb color]\n"
" [-nf color] [-sb color] [-sf color] [-v]\n", stderr);
exit(EXIT_FAILURE);
}
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int
main(int argc, char *argv[]) {
int i;
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progname = "dmenu";
dc = initdraw();
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for(i = 1; i < argc; i++)
/* single flags */
if(!strcmp(argv[i], "-v")) {
fputs("dmenu-"VERSION", © 2006-2010 dmenu engineers, see LICENSE for details\n", stdout);
exit(EXIT_SUCCESS);
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}
else if(!strcmp(argv[i], "-b"))
topbar = False;
else if(!strcmp(argv[i], "-i")) {
fstrncmp = strncasecmp;
fstrstr = cistrstr;
}
else if(i == argc-1)
usage();
/* double flags */
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else if(!strcmp(argv[i], "-l"))
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lines = atoi(argv[++i]);
else if(!strcmp(argv[i], "-p"))
prompt = argv[++i];
else if(!strcmp(argv[i], "-fn"))
initfont(dc, argv[++i]);
else if(!strcmp(argv[i], "-nb"))
normbgcolor = argv[++i];
else if(!strcmp(argv[i], "-nf"))
normfgcolor = argv[++i];
else if(!strcmp(argv[i], "-sb"))
selbgcolor = argv[++i];
else if(!strcmp(argv[i], "-sf"))
selfgcolor = argv[++i];
else
usage();
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readstdin();
setup();
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run();
return EXIT_FAILURE; /* should not reach */
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}