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>
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#include <locale.h>
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#include <stdarg.h>
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
#include <X11/keysym.h>
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/* macros */
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#define CLEANMASK(mask) (mask & ~(numlockmask | LockMask))
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/* enums */
enum { ColFG, ColBG, ColLast };
/* typedefs */
typedef struct {
int x, y, w, h;
unsigned long norm[ColLast];
unsigned long sel[ColLast];
Drawable drawable;
GC gc;
struct {
XFontStruct *xfont;
XFontSet set;
int ascent;
int descent;
int height;
} font;
} DC; /* draw context */
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typedef struct Item Item;
struct Item {
Item *next; /* traverses all items */
Item *left, *right; /* traverses items matching current search pattern */
char *text;
Bool matched;
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};
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/* forward declarations */
Item *appenditem(Item *i, Item *last);
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void calcoffsets(void);
void cleanup(void);
void drawmenu(void);
void drawtext(const char *text, unsigned long col[ColLast]);
void *emalloc(unsigned int size);
void eprint(const char *errstr, ...);
char *estrdup(const char *str);
unsigned long getcolor(const char *colstr);
Bool grabkeyboard(void);
void initfont(const char *fontstr);
void kpress(XKeyEvent * e);
void match(char *pattern);
void readstdin(void);
void run(void);
void setup(Bool bottom);
int strcaseido(const char *text, const char *pattern);
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unsigned int textnw(const char *text, unsigned int len);
unsigned int textw(const char *text);
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#include "config.h"
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/* variables */
char *font = FONT;
char *maxname = NULL;
char *normbg = NORMBGCOLOR;
char *normfg = NORMFGCOLOR;
char *prompt = NULL;
char *selbg = SELBGCOLOR;
char *selfg = SELFGCOLOR;
char text[4096];
int screen;
int ret = 0;
unsigned int cmdw = 0;
unsigned int mw, mh;
unsigned int promptw = 0;
unsigned int nitem = 0;
unsigned int numlockmask = 0;
Bool idomatch = False;
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Bool running = True;
Display *dpy;
DC dc = {0};
Item *allitems = NULL; /* first of all items */
Item *item = NULL; /* first of pattern matching items */
Item *sel = NULL;
Item *next = NULL;
Item *prev = NULL;
Item *curr = NULL;
Window root, win;
Item *
appenditem(Item *i, Item *last) {
if(!last)
item = i;
else
last->right = i;
i->matched = True;
i->left = last;
i->right = NULL;
last = i;
nitem++;
return last;
}
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void
calcoffsets(void) {
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unsigned int tw, w;
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if(!curr)
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return;
w = promptw + cmdw + 2 * SPACE;
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for(next = curr; next; next=next->right) {
tw = textw(next->text);
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if(tw > mw / 3)
tw = mw / 3;
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w += tw;
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if(w > mw)
break;
}
w = promptw + cmdw + 2 * SPACE;
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for(prev = curr; prev && prev->left; prev=prev->left) {
tw = textw(prev->left->text);
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if(tw > mw / 3)
tw = mw / 3;
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w += tw;
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if(w > mw)
break;
}
}
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void
cleanup(void) {
Item *itm;
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);
XUngrabKeyboard(dpy, CurrentTime);
}
void
drawmenu(void) {
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Item *i;
dc.x = 0;
dc.y = 0;
dc.w = mw;
dc.h = mh;
drawtext(NULL, dc.norm);
/* print prompt? */
if(promptw) {
dc.w = promptw;
drawtext(prompt, dc.sel);
}
dc.x += promptw;
dc.w = mw - promptw;
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/* print command */
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if(cmdw && item)
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dc.w = cmdw;
drawtext(text[0] ? text : NULL, dc.norm);
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dc.x += cmdw;
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if(curr) {
dc.w = SPACE;
drawtext((curr && curr->left) ? "<" : NULL, dc.norm);
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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);
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dc.x += dc.w;
}
dc.x = mw - SPACE;
dc.w = SPACE;
drawtext(next ? ">" : NULL, dc.norm);
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}
XCopyArea(dpy, dc.drawable, win, dc.gc, 0, 0, mw, mh, 0, 0);
XFlush(dpy);
}
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void
drawtext(const char *text, unsigned long col[ColLast]) {
int x, y, w, h;
static char buf[256];
unsigned int len, olen;
XRectangle r = { dc.x, dc.y, dc.w, dc.h };
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XSetForeground(dpy, dc.gc, col[ColBG]);
XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1);
if(!text)
return;
w = 0;
olen = len = strlen(text);
if(len >= sizeof buf)
len = sizeof buf - 1;
memcpy(buf, text, len);
buf[len] = 0;
h = dc.font.ascent + dc.font.descent;
y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent;
x = dc.x + (h / 2);
/* shorten text if necessary */
while(len && (w = textnw(buf, len)) > dc.w - h)
buf[--len] = 0;
if(len < olen) {
if(len > 1)
buf[len - 1] = '.';
if(len > 2)
buf[len - 2] = '.';
if(len > 3)
buf[len - 3] = '.';
}
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if(w > dc.w)
return; /* too long */
XSetForeground(dpy, dc.gc, col[ColFG]);
if(dc.font.set)
XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len);
else
XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len);
}
void *
emalloc(unsigned int size) {
void *res = malloc(size);
if(!res)
eprint("fatal: could not malloc() %u bytes\n", size);
return res;
}
void
eprint(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
char *
estrdup(const char *str) {
void *res = strdup(str);
if(!res)
eprint("fatal: could not malloc() %u bytes\n", strlen(str));
return res;
}
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unsigned long
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getcolor(const char *colstr) {
Colormap cmap = DefaultColormap(dpy, screen);
XColor color;
if(!XAllocNamedColor(dpy, cmap, colstr, &color, &color))
eprint("error, cannot allocate color '%s'\n", colstr);
return color.pixel;
}
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Bool
grabkeyboard(void) {
unsigned int len;
for(len = 1000; len; len--) {
if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
== GrabSuccess)
break;
usleep(1000);
}
return len > 0;
}
void
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initfont(const char *fontstr) {
char *def, **missing;
int i, n;
if(!fontstr || fontstr[0] == '\0')
eprint("error, cannot load font: '%s'\n", fontstr);
missing = NULL;
if(dc.font.set)
XFreeFontSet(dpy, dc.font.set);
dc.font.set = XCreateFontSet(dpy, fontstr, &missing, &n, &def);
if(missing)
XFreeStringList(missing);
if(dc.font.set) {
XFontSetExtents *font_extents;
XFontStruct **xfonts;
char **font_names;
dc.font.ascent = dc.font.descent = 0;
font_extents = XExtentsOfFontSet(dc.font.set);
n = XFontsOfFontSet(dc.font.set, &xfonts, &font_names);
for(i = 0, dc.font.ascent = 0, dc.font.descent = 0; i < n; i++) {
if(dc.font.ascent < (*xfonts)->ascent)
dc.font.ascent = (*xfonts)->ascent;
if(dc.font.descent < (*xfonts)->descent)
dc.font.descent = (*xfonts)->descent;
xfonts++;
}
}
else {
if(dc.font.xfont)
XFreeFont(dpy, dc.font.xfont);
dc.font.xfont = NULL;
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if(!(dc.font.xfont = XLoadQueryFont(dpy, fontstr))
&& !(dc.font.xfont = XLoadQueryFont(dpy, "fixed")))
eprint("error, cannot load font: '%s'\n", fontstr);
dc.font.ascent = dc.font.xfont->ascent;
dc.font.descent = dc.font.xfont->descent;
}
dc.font.height = dc.font.ascent + dc.font.descent;
}
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void
kpress(XKeyEvent * e) {
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char buf[32];
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int i, num;
unsigned int len;
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KeySym ksym;
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len = strlen(text);
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buf[0] = 0;
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num = XLookupString(e, buf, sizeof buf, &ksym, 0);
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if(IsKeypadKey(ksym)) {
if(ksym == XK_KP_Enter) {
ksym = XK_Return;
} else if(ksym >= XK_KP_0 && ksym <= XK_KP_9) {
ksym = (ksym - XK_KP_0) + XK_0;
}
}
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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;
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case XK_bracketleft:
ksym = XK_Escape;
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break;
case XK_h:
case XK_H:
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ksym = XK_BackSpace;
break;
case XK_i:
case XK_I:
ksym = XK_Tab;
break;
case XK_j:
case XK_J:
ksym = XK_Return;
break;
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case XK_u:
case XK_U:
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text[0] = 0;
match(text);
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drawmenu();
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return;
case XK_w:
case XK_W:
if(len) {
i = len - 1;
while(i >= 0 && text[i] == ' ')
text[i--] = 0;
while(i >= 0 && text[i] != ' ')
text[i--] = 0;
match(text);
drawmenu();
}
return;
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}
}
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if(CLEANMASK(e->state) & Mod1Mask) {
switch(ksym) {
default: return;
case XK_h:
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ksym = XK_Left;
break;
case XK_l:
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ksym = XK_Right;
break;
case XK_j:
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ksym = XK_Next;
break;
case XK_k:
ksym = XK_Prior;
break;
case XK_g:
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ksym = XK_Home;
break;
case XK_G:
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ksym = XK_End;
break;
}
}
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switch(ksym) {
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);
}
break;
case XK_BackSpace:
if(len) {
text[--len] = 0;
match(text);
}
break;
case XK_End:
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if(!item)
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return;
while(next) {
sel = curr = next;
calcoffsets();
}
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while(sel && sel->right)
sel = sel->right;
break;
case XK_Escape:
ret = 1;
running = False;
break;
case XK_Home:
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if(!item)
return;
sel = curr = item;
calcoffsets();
break;
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case XK_Left:
if(!(sel && sel->left))
return;
sel=sel->left;
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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:
if((e->state & ShiftMask) && text)
fprintf(stdout, "%s", text);
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else if(sel)
fprintf(stdout, "%s", sel->text);
else if(text)
fprintf(stdout, "%s", text);
fflush(stdout);
running = False;
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break;
case XK_Right:
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);
match(text);
break;
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}
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drawmenu();
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}
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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)
i->matched = False;
for(i = allitems; i; i = i->next)
if(!i->matched && !strncasecmp(pattern, i->text, plen))
j = appenditem(i,j);
for (i = allitems; i; i = i->next)
if(!i->matched && strcasestr(i->text, pattern))
j = appenditem(i, j);
if(idomatch)
for (i = allitems; i; i = i->next)
if(!i->matched && strcaseido(i->text, pattern))
j = appenditem(i, j);
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curr = prev = next = sel = item;
calcoffsets();
}
void
readstdin(void) {
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char *p, buf[1024];
unsigned int len = 0, max = 0;
Item *i, *new;
i = 0;
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while(fgets(buf, sizeof buf, stdin)) {
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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)
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allitems = new;
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else
i->next = new;
i = new;
}
}
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void
run(void) {
XEvent ev;
/* 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;
}
}
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void
setup(Bool bottom) {
unsigned int i, j;
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XModifierKeymap *modmap;
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XSetWindowAttributes wa;
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/* init modifier map */
modmap = XGetModifierMapping(dpy);
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for(i = 0; i < 8; i++)
for(j = 0; j < modmap->max_keypermod; j++) {
if(modmap->modifiermap[i * modmap->max_keypermod + j]
== XKeysymToKeycode(dpy, XK_Num_Lock))
numlockmask = (1 << i);
}
XFreeModifiermap(modmap);
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/* style */
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dc.norm[ColBG] = getcolor(normbg);
dc.norm[ColFG] = getcolor(normfg);
dc.sel[ColBG] = getcolor(selbg);
dc.sel[ColFG] = getcolor(selfg);
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initfont(font);
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/* menu window */
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wa.override_redirect = 1;
wa.background_pixmap = ParentRelative;
wa.event_mask = ExposureMask | ButtonPressMask | KeyPressMask;
mw = DisplayWidth(dpy, screen);
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mh = dc.font.height + 2;
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win = XCreateWindow(dpy, root, 0,
bottom ? DisplayHeight(dpy, screen) - mh : 0, mw, mh, 0,
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DefaultDepth(dpy, screen), CopyFromParent,
DefaultVisual(dpy, screen),
CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
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/* pixmap */
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dc.drawable = XCreatePixmap(dpy, root, mw, mh, DefaultDepth(dpy, screen));
dc.gc = XCreateGC(dpy, root, 0, 0);
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XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
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if(!dc.font.set)
XSetFont(dpy, dc.gc, dc.font.xfont->fid);
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if(maxname)
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cmdw = textw(maxname);
if(cmdw > mw / 3)
cmdw = mw / 3;
if(prompt)
promptw = textw(prompt);
if(promptw > mw / 5)
promptw = mw / 5;
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text[0] = 0;
match(text);
XMapRaised(dpy, win);
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}
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int
strcaseido(const char *text, const char *pattern) {
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for(; *text && *pattern; text++)
if (tolower(*text) == tolower(*pattern))
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pattern++;
return !*pattern;
}
unsigned int
textnw(const char *text, unsigned int len) {
XRectangle r;
if(dc.font.set) {
XmbTextExtents(dc.font.set, text, len, NULL, &r);
return r.width;
}
return XTextWidth(dc.font.xfont, text, len);
}
unsigned int
textw(const char *text) {
return textnw(text, strlen(text)) + dc.font.height;
}
int
main(int argc, char *argv[]) {
Bool bottom = False;
unsigned int i;
/* command line args */
for(i = 1; i < argc; i++)
if(!strcmp(argv[i], "-b")) {
bottom = True;
}
else if(!strcmp(argv[i], "-i"))
idomatch = True;
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else if(!strcmp(argv[i], "-fn")) {
if(++i < argc) font = argv[i];
}
else if(!strcmp(argv[i], "-nb")) {
if(++i < argc) normbg = argv[i];
}
else if(!strcmp(argv[i], "-nf")) {
if(++i < argc) normfg = argv[i];
}
else if(!strcmp(argv[i], "-p")) {
if(++i < argc) prompt = argv[i];
}
else if(!strcmp(argv[i], "-sb")) {
if(++i < argc) selbg = argv[i];
}
else if(!strcmp(argv[i], "-sf")) {
if(++i < argc) selfg = argv[i];
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}
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else if(!strcmp(argv[i], "-v"))
eprint("dmenu-"VERSION", © 2006-2007 Anselm R. Garbe, Sander van Dijk, Michał Janeczek\n");
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else
eprint("usage: dmenu [-b] [-i] [-fn <font>] [-nb <color>] [-nf <color>]\n"
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" [-p <prompt>] [-sb <color>] [-sf <color>] [-v]\n");
setlocale(LC_CTYPE, "");
dpy = XOpenDisplay(0);
if(!dpy)
eprint("dmenu: cannot open display\n");
screen = DefaultScreen(dpy);
root = RootWindow(dpy, screen);
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if(isatty(STDIN_FILENO)) {
readstdin();
running = grabkeyboard();
}
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else { /* prevent keypress loss */
running = grabkeyboard();
readstdin();
}
setup(bottom);
drawmenu();
XSync(dpy, False);
run();
cleanup();
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XCloseDisplay(dpy);
return ret;
}