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src/dmenubar/main.c
Anselm R. Garbe e916910ae9 simplified main event loop
2006-10-10 19:15:06 +02:00

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/* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
* (C)opyright MMVI Sander van Dijk <a dot h dot vandijk at gmail dot com>
* See LICENSE file for license details.
*/
#include "dmenu.h"
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/select.h>
#include <sys/time.h>
#include <X11/cursorfont.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
typedef struct Item Item;
struct Item {
Item *next; /* traverses all items */
Item *left, *right; /* traverses items matching current search pattern */
char *text;
};
/* static */
static char text[4096];
static int mx, my, mw, mh;
static int ret = 0;
static int nitem = 0;
static unsigned int cmdw = 0;
static Bool running = True;
static Item *allitems = NULL; /* first of all items */
static Item *item = NULL; /* first of pattern matching items */
static Item *sel = NULL;
static Item *next = NULL;
static Item *prev = NULL;
static Item *curr = NULL;
static Window root;
static Window win;
static void
calcoffsets(void) {
unsigned int tw, w;
if(!curr)
return;
w = cmdw + 2 * SPACE;
for(next = curr; next; next=next->right) {
tw = textw(next->text);
if(tw > mw / 3)
tw = mw / 3;
w += tw;
if(w > mw)
break;
}
w = cmdw + 2 * SPACE;
for(prev = curr; prev && prev->left; prev=prev->left) {
tw = textw(prev->left->text);
if(tw > mw / 3)
tw = mw / 3;
w += tw;
if(w > mw)
break;
}
}
static void
drawmenu(void) {
Item *i;
dc.x = 0;
dc.y = 0;
dc.w = mw;
dc.h = mh;
drawtext(NULL, dc.norm);
/* print command */
if(cmdw && item)
dc.w = cmdw;
drawtext(text[0] ? text : NULL, dc.norm);
dc.x += cmdw;
if(curr) {
dc.w = SPACE;
drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
dc.x += dc.w;
/* determine maximum items */
for(i = curr; i != next; i=i->right) {
dc.w = textw(i->text);
if(dc.w > mw / 3)
dc.w = mw / 3;
drawtext(i->text, (sel == i) ? dc.sel : dc.norm);
dc.x += dc.w;
}
dc.x = mw - SPACE;
dc.w = SPACE;
drawtext(next ? ">" : NULL, dc.norm);
}
XCopyArea(dpy, dc.drawable, win, dc.gc, 0, 0, mw, mh, 0, 0);
XFlush(dpy);
}
static void
match(char *pattern) {
unsigned int plen;
Item *i, *j;
if(!pattern)
return;
plen = strlen(pattern);
item = j = NULL;
nitem = 0;
for(i = allitems; i; i=i->next)
if(!plen || !strncmp(pattern, i->text, plen)) {
if(!j)
item = i;
else
j->right = i;
i->left = j;
i->right = NULL;
j = i;
nitem++;
}
for(i = allitems; i; i=i->next)
if(plen && strncmp(pattern, i->text, plen)
&& strstr(i->text, pattern)) {
if(!j)
item = i;
else
j->right = i;
i->left = j;
i->right = NULL;
j = i;
nitem++;
}
curr = prev = next = sel = item;
calcoffsets();
}
static void
kpress(XKeyEvent * e) {
char buf[32];
int num, prev_nitem;
unsigned int i, len;
KeySym ksym;
len = strlen(text);
buf[0] = 0;
num = XLookupString(e, buf, sizeof(buf), &ksym, 0);
if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
|| IsPrivateKeypadKey(ksym))
return;
/* first check if a control mask is omitted */
if(e->state & ControlMask) {
switch (ksym) {
default: /* ignore other control sequences */
return;
break;
case XK_h:
case XK_H:
ksym = XK_BackSpace;
break;
case XK_u:
case XK_U:
text[0] = 0;
match(text);
drawmenu();
return;
break;
}
}
switch(ksym) {
case XK_Left:
if(!(sel && sel->left))
return;
sel=sel->left;
if(sel->right == curr) {
curr = prev;
calcoffsets();
}
break;
case XK_Tab:
if(!sel)
return;
strncpy(text, sel->text, sizeof(text));
match(text);
break;
case XK_Right:
if(!(sel && sel->right))
return;
sel=sel->right;
if(sel == next) {
curr = next;
calcoffsets();
}
break;
case XK_Return:
if((e->state & ShiftMask) && text)
fprintf(stdout, "%s", text);
else if(sel)
fprintf(stdout, "%s", sel->text);
else if(text)
fprintf(stdout, "%s", text);
fflush(stdout);
running = False;
break;
case XK_Escape:
ret = 1;
running = False;
break;
case XK_BackSpace:
if((i = len)) {
prev_nitem = nitem;
do {
text[--i] = 0;
match(text);
} while(i && nitem && prev_nitem == nitem);
match(text);
}
break;
default:
if(num && !iscntrl((int) buf[0])) {
buf[num] = 0;
if(len > 0)
strncat(text, buf, sizeof(text));
else
strncpy(text, buf, sizeof(text));
match(text);
}
}
drawmenu();
}
static char *
readstdin(void) {
static char *maxname = NULL;
char *p, buf[1024];
unsigned int len = 0, max = 0;
Item *i, *new;
i = 0;
while(fgets(buf, sizeof(buf), stdin)) {
len = strlen(buf);
if (buf[len - 1] == '\n')
buf[len - 1] = 0;
p = estrdup(buf);
if(max < len) {
maxname = p;
max = len;
}
new = emalloc(sizeof(Item));
new->next = new->left = new->right = NULL;
new->text = p;
if(!i)
allitems = new;
else
i->next = new;
i = new;
}
return maxname;
}
/* extern */
int screen;
Display *dpy;
DC dc = {0};
int
main(int argc, char *argv[]) {
char *font = FONT;
char *maxname;
char *normbg = NORMBGCOLOR;
char *normfg = NORMFGCOLOR;
char *selbg = SELBGCOLOR;
char *selfg = SELFGCOLOR;
fd_set rd;
int i;
struct timeval timeout;
Item *itm;
XEvent ev;
XSetWindowAttributes wa;
timeout.tv_usec = 0;
timeout.tv_sec = 3;
/* command line args */
for(i = 1; i < argc; i++)
if(!strncmp(argv[i], "-font", 6))
font = argv[++i];
else if(!strncmp(argv[i], "-normbg", 8))
normbg = argv[++i];
else if(!strncmp(argv[i], "-normfg", 8))
normfg = argv[++i];
else if(!strncmp(argv[i], "-selbg", 7))
selbg = argv[++i];
else if(!strncmp(argv[i], "-selfg", 7))
selfg = argv[++i];
else if(!strncmp(argv[i], "-t", 3))
timeout.tv_sec = atoi(argv[++i]);
else if(!strncmp(argv[i], "-v", 3)) {
fputs("dmenu-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
exit(EXIT_SUCCESS);
}
else
eprint("usage: dmenu [-font <name>] [-{norm,sel}{bg,fg} <color>] [-t <seconds>] [-v]\n", stdout);
dpy = XOpenDisplay(0);
if(!dpy)
eprint("dmenu: cannot open display\n");
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
/* Note, the select() construction allows to grab all keypresses as
* early as possible, to not loose them. But if there is no standard
* input supplied, we will make sure to exit after MAX_WAIT_STDIN
* seconds. This is convenience behavior for rapid typers.
*/
while(XGrabKeyboard(dpy, root, True, GrabModeAsync,
GrabModeAsync, CurrentTime) != GrabSuccess)
usleep(1000);
FD_ZERO(&rd);
FD_SET(STDIN_FILENO, &rd);
if(select(ConnectionNumber(dpy) + 1, &rd, NULL, NULL, &timeout) < 1)
goto UninitializedEnd;
maxname = readstdin();
/* style */
dc.norm[ColBG] = getcolor(normbg);
dc.norm[ColFG] = getcolor(normfg);
dc.sel[ColBG] = getcolor(selbg);
dc.sel[ColFG] = getcolor(selfg);
setfont(font);
/* menu window */
wa.override_redirect = 1;
wa.background_pixmap = ParentRelative;
wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
mx = my = 0;
mw = DisplayWidth(dpy, screen);
mh = dc.font.height + 2;
win = XCreateWindow(dpy, root, mx, my, mw, mh, 0,
DefaultDepth(dpy, screen), CopyFromParent,
DefaultVisual(dpy, screen),
CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
XDefineCursor(dpy, win, XCreateFontCursor(dpy, XC_xterm));
/* pixmap */
dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
dc.gc = XCreateGC(dpy, root, 0, 0);
XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
if(maxname)
cmdw = textw(maxname);
if(cmdw > mw / 3)
cmdw = mw / 3;
text[0] = 0;
match(text);
XMapRaised(dpy, win);
drawmenu();
XSync(dpy, False);
/* main event loop */
while(running && !XNextEvent(dpy, &ev))
switch (ev.type) {
default: /* ignore all crap */
break;
case KeyPress:
kpress(&ev.xkey);
break;
case Expose:
if(ev.xexpose.count == 0)
drawmenu();
break;
}
/* cleanup */
while(allitems) {
itm = allitems->next;
free(allitems->text);
free(allitems);
allitems = itm;
}
if(dc.font.set)
XFreeFontSet(dpy, dc.font.set);
else
XFreeFont(dpy, dc.font.xfont);
XFreePixmap(dpy, dc.drawable);
XFreeGC(dpy, dc.gc);
XDestroyWindow(dpy, win);
UninitializedEnd:
XUngrabKeyboard(dpy, CurrentTime);
XCloseDisplay(dpy);
return ret;
}
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