add lots of comments
This commit is contained in:
Connor Lane Smith
parent
dd29c5d480
commit
7b1493a631
51
dmenu.c
51
dmenu.c
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@ -70,35 +70,35 @@ main(int argc, char *argv[]) {
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int i;
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for(i = 1; i < argc; i++)
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/* single flags */
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if(!strcmp(argv[i], "-v")) {
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/* these options take no arguments */
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if(!strcmp(argv[i], "-v")) { /* prints version information */
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puts("dmenu-"VERSION", © 2006-2011 dmenu engineers, see LICENSE for details");
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exit(EXIT_SUCCESS);
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}
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else if(!strcmp(argv[i], "-b"))
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else if(!strcmp(argv[i], "-b")) /* appears at the bottom of the screen */
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topbar = False;
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else if(!strcmp(argv[i], "-f"))
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else if(!strcmp(argv[i], "-f")) /* grabs keyboard before reading stdin */
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fast = True;
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else if(!strcmp(argv[i], "-i")) {
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else if(!strcmp(argv[i], "-i")) { /* case-insensitive item matching */
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fstrncmp = strncasecmp;
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fstrstr = cistrstr;
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}
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else if(i+1 == argc)
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usage();
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/* double flags */
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else if(!strcmp(argv[i], "-l"))
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/* these options take one argument */
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else if(!strcmp(argv[i], "-l")) /* number of lines in vertical list */
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lines = atoi(argv[++i]);
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else if(!strcmp(argv[i], "-p"))
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else if(!strcmp(argv[i], "-p")) /* adds prompt to left of input field */
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prompt = argv[++i];
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else if(!strcmp(argv[i], "-fn"))
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else if(!strcmp(argv[i], "-fn")) /* font or font set */
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font = argv[++i];
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else if(!strcmp(argv[i], "-nb"))
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else if(!strcmp(argv[i], "-nb")) /* normal background color */
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normbgcolor = argv[++i];
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else if(!strcmp(argv[i], "-nf"))
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else if(!strcmp(argv[i], "-nf")) /* normal foreground color */
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normfgcolor = argv[++i];
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else if(!strcmp(argv[i], "-sb"))
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else if(!strcmp(argv[i], "-sb")) /* selected background color */
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selbgcolor = argv[++i];
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else if(!strcmp(argv[i], "-sf"))
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else if(!strcmp(argv[i], "-sf")) /* selected foreground color */
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selfgcolor = argv[++i];
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else
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usage();
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@ -140,7 +140,7 @@ calcoffsets(void) {
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n = lines * bh;
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else
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n = mw - (promptw + inputw + textw(dc, "<") + textw(dc, ">"));
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/* calculate which items will begin the next page and previous page */
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for(i = 0, next = curr; next; next = next->right)
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if((i += (lines > 0) ? bh : MIN(textw(dc, next->text), n)) > n)
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break;
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@ -174,12 +174,14 @@ drawmenu(void) {
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drawtext(dc, prompt, selcol);
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dc->x = dc->w;
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}
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/* draw input field */
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dc->w = (lines > 0 || !matches) ? mw - dc->x : inputw;
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drawtext(dc, text, normcol);
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if((curpos = textnw(dc, text, cursor) + dc->h/2 - 2) < dc->w)
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drawrect(dc, curpos, 2, 1, dc->h - 4, True, FG(dc, normcol));
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if(lines > 0) {
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/* draw vertical list */
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dc->w = mw - dc->x;
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for(item = curr; item != next; item = item->right) {
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dc->y += dc->h;
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@ -187,6 +189,7 @@ drawmenu(void) {
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}
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}
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else if(matches) {
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/* draw horizontal list */
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dc->x += inputw;
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dc->w = textw(dc, "<");
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if(curr->left)
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@ -208,6 +211,7 @@ void
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grabkeyboard(void) {
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int i;
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/* try to grab keyboard, we may have to wait for another process to ungrab */
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for(i = 0; i < 1000; i++) {
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if(XGrabKeyboard(dc->dpy, DefaultRootWindow(dc->dpy), True,
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GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
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@ -221,6 +225,7 @@ void
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insert(const char *str, ssize_t n) {
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if(strlen(text) + n > sizeof text - 1)
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return;
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/* move existing text out of the way, insert new text, and update cursor */
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memmove(&text[cursor + n], &text[cursor], sizeof text - cursor - MAX(n, 0));
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if(n > 0)
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memcpy(&text[cursor], str, n);
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@ -297,6 +302,7 @@ keypress(XKeyEvent *ev) {
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break;
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}
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if(next) {
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/* jump to end of list and position items in reverse */
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curr = matchend;
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calcoffsets();
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curr = prev;
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@ -378,6 +384,7 @@ match(void) {
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Item *item, *lprefix, *lsubstr, *prefixend, *substrend;
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strcpy(buf, text);
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/* separate input text into tokens to be matched individually */
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for(s = strtok(buf, " "); s; tokv[tokc-1] = s, s = strtok(NULL, " "))
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if(++tokc > tokn && !(tokv = realloc(tokv, ++tokn * sizeof *tokv)))
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eprintf("cannot realloc %u bytes\n", tokn * sizeof *tokv);
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@ -388,8 +395,9 @@ match(void) {
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for(i = 0; i < tokc; i++)
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if(!fstrstr(item->text, tokv[i]))
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break;
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if(i != tokc)
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if(i != tokc) /* not all tokens match */
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continue;
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/* exact matches go first, then prefixes, then substrings */
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if(!tokc || !fstrncmp(tokv[0], item->text, len+1))
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appenditem(item, &matches, &matchend);
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else if(!fstrncmp(tokv[0], item->text, len))
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@ -423,6 +431,7 @@ size_t
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nextrune(int inc) {
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ssize_t n;
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/* return location of next utf8 rune in the given direction (+1 or -1) */
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for(n = cursor + inc; n + inc >= 0 && (text[n] & 0xc0) == 0x80; n += inc);
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return n;
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}
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@ -434,6 +443,7 @@ paste(void) {
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unsigned long dl;
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Atom da;
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/* we have been given the current selection, now insert it into input */
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XGetWindowProperty(dc->dpy, win, utf8, 0, (sizeof text / 4) + 1, False,
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utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
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insert(p, (q = strchr(p, '\n')) ? q-p : (ssize_t)strlen(p));
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@ -446,6 +456,7 @@ readstdin(void) {
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char buf[sizeof text], *p, *maxstr = NULL;
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size_t i, max = 0, size = 0;
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/* read each line from stdin and add it to the item list */
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for(i = 0; fgets(buf, sizeof buf, stdin); i++) {
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if(i+1 >= size / sizeof *items)
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if(!(items = realloc(items, (size += BUFSIZ))))
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@ -508,7 +519,7 @@ setup(void) {
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utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
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/* menu geometry */
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/* calculate menu geometry */
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bh = dc->font.height + 2;
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lines = MAX(lines, 0);
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mh = (lines + 1) * bh;
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@ -521,10 +532,12 @@ setup(void) {
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XGetInputFocus(dc->dpy, &w, &di);
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if(w != root && w != PointerRoot && w != None) {
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/* find top-level window containing current input focus */
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do {
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if(XQueryTree(dc->dpy, (pw = w), &dw, &w, &dws, &du) && dws)
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XFree(dws);
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} while(w != root && w != pw);
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/* find xinerama screen with which the window intersects most */
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if(XGetWindowAttributes(dc->dpy, pw, &wa))
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for(j = 0; j < n; j++)
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if((a = INTERSECT(wa.x, wa.y, wa.width, wa.height, info[j])) > area) {
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@ -532,10 +545,12 @@ setup(void) {
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i = j;
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}
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}
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/* no focused window is on screen, so use pointer location instead */
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if(!area && XQueryPointer(dc->dpy, root, &dw, &dw, &x, &y, &di, &di, &du))
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for(i = 0; i < n; i++)
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if(INTERSECT(x, y, 1, 1, info[i]))
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break;
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x = info[i].x_org;
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y = info[i].y_org + (topbar ? 0 : info[i].height - mh);
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mw = info[i].width;
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@ -552,7 +567,7 @@ setup(void) {
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inputw = MIN(inputw, mw/3);
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match();
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/* menu window */
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/* create menu window */
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swa.override_redirect = True;
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swa.background_pixmap = ParentRelative;
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swa.event_mask = ExposureMask | KeyPressMask | VisibilityChangeMask;
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@ -561,7 +576,7 @@ setup(void) {
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DefaultVisual(dc->dpy, screen),
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CWOverrideRedirect | CWBackPixmap | CWEventMask, &swa);
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/* input methods */
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/* open input methods */
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xim = XOpenIM(dc->dpy, NULL, NULL, NULL);
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xic = XCreateIC(xim, XNInputStyle, XIMPreeditNothing | XIMStatusNothing,
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XNClientWindow, win, XNFocusWindow, win, NULL);
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