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Annotation of coherent/g/usr/bin/me/window.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Window management.
        !             3:  * Some of the functions are internal, and some are attached to keys that the
        !             4:  * user actually types.
        !             5:  */
        !             6: #include       <stdio.h>
        !             7: #include       "ed.h"
        !             8: 
        !             9: /*
        !            10:  * Reposition dot in the current window to line "n".  If the argument is
        !            11:  * positive, it is that line.  If it is negative it is that line from the
        !            12:  * bottom.  If it is 0 the window is centered (this is what the standard
        !            13:  * redisplay code does).  With no argument it defaults to 1.  Because of
        !            14:  * the default, it works like in Gosling.
        !            15:  * Bound to M-!.
        !            16:  */
        !            17: reposition(f, n)
        !            18: {
        !            19:        curwp->w_force = n;
        !            20:        curwp->w_flag |= WFFORCE;
        !            21:        return (TRUE);
        !            22: }
        !            23: 
        !            24: /*
        !            25:  * Refresh the screen.  With no argument, it just does the refresh.
        !            26:  * With an argument it recenters "." in the current window.
        !            27:  * Bound to "C-L".
        !            28:  */
        !            29: refresh(f, n)
        !            30: {
        !            31:        if (f == FALSE)
        !            32:                sgarbf = TRUE;
        !            33:        else {
        !            34:                curwp->w_force = 0;             /* Center dot.          */
        !            35:                curwp->w_flag |= WFFORCE;
        !            36:        }
        !            37:        return (TRUE);
        !            38: }
        !            39: 
        !            40: /*
        !            41:  * The command make the next window (next => down the screen) the current
        !            42:  * window.  There are no real errors, although the command does nothing if
        !            43:  * there is only 1 window on the screen.
        !            44:  * Bound to "C-X C-N".
        !            45:  */
        !            46: nextwind(f, n)
        !            47: {
        !            48:        register WINDOW *wp;
        !            49: 
        !            50:        if ((wp=curwp->w_wndp) == NULL)
        !            51:                wp = wheadp;
        !            52:        curwp = wp;
        !            53:        curbp = wp->w_bufp;
        !            54:        return (TRUE);
        !            55: }
        !            56: 
        !            57: /*
        !            58:  * This command makes the previous window (previous => up the screen) the
        !            59:  * current window.  There arn't any errors, although the command does not
        !            60:  * do a lot if there is 1 window.
        !            61:  */
        !            62: prevwind(f, n)
        !            63: {
        !            64:        register WINDOW *wp1;
        !            65:        register WINDOW *wp2;
        !            66: 
        !            67:        wp1 = wheadp;
        !            68:        wp2 = curwp;
        !            69:        if (wp1 == wp2)
        !            70:                wp2 = NULL;
        !            71:        while (wp1->w_wndp != wp2)
        !            72:                wp1 = wp1->w_wndp;
        !            73:        curwp = wp1;
        !            74:        curbp = wp1->w_bufp;
        !            75:        return (TRUE);
        !            76: }
        !            77: 
        !            78: /*
        !            79:  * This command moves the current window down by "arg" lines.  Recompute
        !            80:  * the top line in the window.  The move up and move down code is almost
        !            81:  * completely the same; most of the work has to do with reframing the
        !            82:  * window, and picking a new dot.  We share the code by having "move down"
        !            83:  * just be an interface to "move up".  Magic.
        !            84:  * Bound to "C-X C-N".
        !            85:  */
        !            86: mvdnwind(f, n)
        !            87: register int   n;
        !            88: {
        !            89:        return (mvupwind(f, -n));
        !            90: }
        !            91: 
        !            92: /*
        !            93:  * Move the current window up by "arg" lines.  Recompute the new top
        !            94:  * line of the window.  Look to see if "." is still on the screen.
        !            95:  * If it is, you win.  If it isn't, then move "." to center it in the
        !            96:  * new framing of the window (this command does not really move ".";
        !            97:  * it moves the frame).  Bound to "C-X C-P".
        !            98:  */
        !            99: mvupwind(f, n)
        !           100: register int   n;
        !           101: {
        !           102:        register LINE   *lp;
        !           103:        register int    i;
        !           104: 
        !           105:        lp = curwp->w_linep;
        !           106:        if (n < 0) {
        !           107:                while (n++ && lp!=curbp->b_linep)
        !           108:                        lp = lforw(lp);
        !           109:        } else {
        !           110:                while (n-- && lback(lp)!=curbp->b_linep)
        !           111:                        lp = lback(lp);
        !           112:        }
        !           113:        curwp->w_linep = lp;
        !           114:        curwp->w_flag |= WFHARD;                /* Mode line is OK.     */
        !           115:        for (i=0; i<curwp->w_ntrows; ++i) {
        !           116:                if (lp == curwp->w_dotp)
        !           117:                        return (TRUE);
        !           118:                if (lp == curbp->b_linep)
        !           119:                        break;
        !           120:                lp = lforw(lp);
        !           121:        }
        !           122:        lp = curwp->w_linep;
        !           123:        i  = curwp->w_ntrows/2;
        !           124:        while (i-- && lp!=curbp->b_linep)
        !           125:                lp = lforw(lp);
        !           126:        curwp->w_dotp  = lp;
        !           127:        curwp->w_doto  = 0;
        !           128:        return (TRUE);
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * This command makes the current window the only window on the screen.
        !           133:  * Try to set the framing so that "." does not have to move on the display.
        !           134:  * Some care has to be taken to keep the values of dot and mark in the buffer
        !           135:  * structures right if the distruction of a window makes a buffer become
        !           136:  * undisplayed.
        !           137:  * Bound to "C-X 1".
        !           138:  */
        !           139: onlywind(f, n)
        !           140: {
        !           141:        register WINDOW *wp;
        !           142:        register WINDOW *np;
        !           143:        np = wheadp;
        !           144:        while ((wp = np) != NULL) {
        !           145:                np = wp->w_wndp;
        !           146:                if (wp != curwp)
        !           147:                        zappwind(wp);
        !           148:        }
        !           149:        return (TRUE);
        !           150: }
        !           151: 
        !           152: /*
        !           153:  * Split the current window.  A window smaller than 3 lines cannot be split.
        !           154:  * The only other error that is possible is a "malloc" failure allocating the
        !           155:  * structure for the new window.
        !           156:  * Bound to "C-X 2".
        !           157:  */
        !           158: splitwind(f, n)
        !           159: {
        !           160:        register WINDOW *wp;
        !           161:        register LINE   *lp;
        !           162:        register int    ntru;
        !           163:        register int    ntrl;
        !           164:        register int    ntrd;
        !           165:        register WINDOW *wp1;
        !           166:        register WINDOW *wp2;
        !           167: 
        !           168:        if (curwp->w_ntrows < 3) {
        !           169:                mlwrite("Cannot split a %d line window", curwp->w_ntrows);
        !           170:                return (FALSE);
        !           171:        }
        !           172:        if ((wp = (WINDOW *) malloc(sizeof(WINDOW))) == NULL) {
        !           173:                mlwrite("Cannot allocate WINDOW block");
        !           174:                return (FALSE);
        !           175:        }
        !           176:        ++curbp->b_nwnd;                        /* Displayed twice.     */
        !           177:        wp->w_bufp  = curbp;
        !           178:        wp->w_dotp  = curwp->w_dotp;
        !           179:        wp->w_doto  = curwp->w_doto;
        !           180:        wp->w_markp = curwp->w_markp;
        !           181:        wp->w_marko = curwp->w_marko;
        !           182:        wp->w_flag  = 0;
        !           183:        wp->w_force = 0;
        !           184:        ntru = (curwp->w_ntrows-1) / 2;         /* Upper size           */
        !           185:        ntrl = (curwp->w_ntrows-1) - ntru;      /* Lower size           */
        !           186:        lp = curwp->w_linep;
        !           187:        ntrd = 0;
        !           188:        while (lp != curwp->w_dotp) {
        !           189:                ++ntrd;
        !           190:                lp = lforw(lp);
        !           191:        }
        !           192:        lp = curwp->w_linep;
        !           193:        if (ntrd <= ntru) {                     /* Old is upper window. */
        !           194:                if (ntrd == ntru)               /* Hit mode line.       */
        !           195:                        lp = lforw(lp);
        !           196:                curwp->w_ntrows = ntru;
        !           197:                wp->w_wndp = curwp->w_wndp;
        !           198:                curwp->w_wndp = wp;
        !           199:                wp->w_toprow = curwp->w_toprow+ntru+1;
        !           200:                wp->w_ntrows = ntrl;
        !           201:        } else {                                /* Old is lower window  */
        !           202:                wp1 = NULL;
        !           203:                wp2 = wheadp;
        !           204:                while (wp2 != curwp) {
        !           205:                        wp1 = wp2;
        !           206:                        wp2 = wp2->w_wndp;
        !           207:                }
        !           208:                if (wp1 == NULL)
        !           209:                        wheadp = wp;
        !           210:                else
        !           211:                        wp1->w_wndp = wp;
        !           212:                wp->w_wndp   = curwp;
        !           213:                wp->w_toprow = curwp->w_toprow;
        !           214:                wp->w_ntrows = ntru;
        !           215:                ++ntru;                         /* Mode line.           */
        !           216:                curwp->w_toprow += ntru;
        !           217:                curwp->w_ntrows  = ntrl;
        !           218:                while (ntru--)
        !           219:                        lp = lforw(lp);
        !           220:        }
        !           221:        curwp->w_linep = lp;                    /* Adjust the top lines */
        !           222:        wp->w_linep = lp;                       /* if necessary.        */
        !           223:        curwp->w_flag |= WFMODE|WFHARD;
        !           224:        wp->w_flag |= WFMODE|WFHARD;
        !           225:        return (TRUE);
        !           226: }
        !           227: 
        !           228: /*
        !           229:  * Enlarge the current window.
        !           230:  * Find the window that loses space.  Make sure it is big enough.
        !           231:  * If so, hack the window descriptions, and ask redisplay to do all the
        !           232:  * hard work.  You don't just set "force reframe" because dot would move.
        !           233:  * Bound to "C-X Z".
        !           234:  */
        !           235: enlargewind(f, n)
        !           236: {
        !           237:        register WINDOW *adjwp;
        !           238:        register LINE   *lp;
        !           239:        register int    i;
        !           240: 
        !           241:        if (n < 0)
        !           242:                return (shrinkwind(f, -n));
        !           243:        if (wheadp->w_wndp == NULL) {
        !           244:                mlwrite("Only one window");
        !           245:                return (FALSE);
        !           246:        }
        !           247:        if ((adjwp=curwp->w_wndp) == NULL) {
        !           248:                adjwp = wheadp;
        !           249:                while (adjwp->w_wndp != curwp)
        !           250:                        adjwp = adjwp->w_wndp;
        !           251:        }
        !           252:        if (adjwp->w_ntrows <= n) {
        !           253:                mlwrite("Impossible change");
        !           254:                return (FALSE);
        !           255:        }
        !           256:        if (curwp->w_wndp == adjwp) {           /* Shrink below.        */
        !           257:                lp = adjwp->w_linep;
        !           258:                for (i=0; i<n && lp!=adjwp->w_bufp->b_linep; ++i)
        !           259:                        lp = lforw(lp);
        !           260:                adjwp->w_linep  = lp;
        !           261:                adjwp->w_toprow += n;
        !           262:        } else {                                /* Shrink above.        */
        !           263:                lp = curwp->w_linep;
        !           264:                for (i=0; i<n && lback(lp)!=curbp->b_linep; ++i)
        !           265:                        lp = lback(lp);
        !           266:                curwp->w_linep  = lp;
        !           267:                curwp->w_toprow -= n;
        !           268:        }
        !           269:        curwp->w_ntrows += n;
        !           270:        adjwp->w_ntrows -= n;
        !           271:        curwp->w_flag |= WFMODE|WFHARD;
        !           272:        adjwp->w_flag |= WFMODE|WFHARD;
        !           273:        return (TRUE);
        !           274: }
        !           275: 
        !           276: /*
        !           277:  * Shrink the current window.
        !           278:  * Find the window that gains space. Hack at the window descriptions.
        !           279:  * Ask the redisplay to do all the hard work.
        !           280:  * Bound to "C-X C-Z".
        !           281:  */
        !           282: shrinkwind(f, n)
        !           283: {
        !           284:        register WINDOW *adjwp;
        !           285:        register LINE   *lp;
        !           286:        register int    i;
        !           287: 
        !           288:        if (n < 0)
        !           289:                return (enlargewind(f, -n));
        !           290:        if (wheadp->w_wndp == NULL) {
        !           291:                mlwrite("Only one window");
        !           292:                return (FALSE);
        !           293:        }
        !           294:        if ((adjwp=curwp->w_wndp) == NULL) {
        !           295:                adjwp = wheadp;
        !           296:                while (adjwp->w_wndp != curwp)
        !           297:                        adjwp = adjwp->w_wndp;
        !           298:        }
        !           299:        if (curwp->w_ntrows <= n) {
        !           300:                mlwrite("Impossible change");
        !           301:                return (FALSE);
        !           302:        }
        !           303:        if (curwp->w_wndp == adjwp) {           /* Grow below.          */
        !           304:                lp = adjwp->w_linep;
        !           305:                for (i=0; i<n && lback(lp)!=adjwp->w_bufp->b_linep; ++i)
        !           306:                        lp = lback(lp);
        !           307:                adjwp->w_linep  = lp;
        !           308:                adjwp->w_toprow -= n;
        !           309:        } else {                                /* Grow above.          */
        !           310:                lp = curwp->w_linep;
        !           311:                for (i=0; i<n && lp!=curbp->b_linep; ++i)
        !           312:                        lp = lforw(lp);
        !           313:                curwp->w_linep  = lp;
        !           314:                curwp->w_toprow += n;
        !           315:        }
        !           316:        curwp->w_ntrows -= n;
        !           317:        adjwp->w_ntrows += n;
        !           318:        curwp->w_flag |= WFMODE|WFHARD;
        !           319:        adjwp->w_flag |= WFMODE|WFHARD;
        !           320:        return (TRUE);
        !           321: }
        !           322: 
        !           323: /*
        !           324:  * Pick a window for a pop-up.
        !           325:  * Split the screen if there is only one window. Pick the uppermost window
        !           326:  * that isn't the current window. An LRU algorithm might be better.
        !           327:  * Return a pointer, or NULL on error.
        !           328:  */
        !           329: WINDOW *
        !           330: wpopup()
        !           331: {
        !           332:        register WINDOW *wp;
        !           333: 
        !           334:        if (wheadp->w_wndp == NULL              /* Only 1 window        */
        !           335:        && splitwind(FALSE, 0) == FALSE)        /* and it won't split   */
        !           336:                return (NULL);
        !           337:        wp = wheadp;                            /* Find window to use   */
        !           338:        while (wp!=NULL && wp==curwp)
        !           339:                wp = wp->w_wndp;
        !           340:        return (wp);
        !           341: }
        !           342: 
        !           343: /* Remove a window specified from the screen, giving the space that it
        !           344:  * vacates to the window above it, if any, or the window below it otherwise.
        !           345:  * If this is the only window, don't remove it at all, but show a message.
        !           346:  * Try to leave the dot where it was on the physical screen.
        !           347:  */
        !           348: zappwind(twp)
        !           349: WINDOW *twp;
        !           350: {
        !           351:        register WINDOW *wp;
        !           352:        register WINDOW *pp;
        !           353: 
        !           354:        pp = NULL;
        !           355:        wp = wheadp;
        !           356: 
        !           357:        while (wp != twp) {
        !           358:                pp = wp;
        !           359:                if ((wp = wp->w_wndp) == NULL) {
        !           360:                        return FALSE;
        !           361:                }
        !           362:        }
        !           363: 
        !           364:        if (pp == NULL) {               /* if first window...   */
        !           365:                register int i;
        !           366:                register LINE   *lp;
        !           367:                LINE            *elp;
        !           368: 
        !           369:                if ((pp = wp->w_wndp) == NULL) {
        !           370:                        wp->w_flag = WFMODE|WFHARD;
        !           371:                        mlwrite("[Only one window]");
        !           372:                        return FALSE;   /* Only window  */
        !           373:                }
        !           374:                wheadp = pp;
        !           375:                i = pp->w_toprow - wp->w_toprow;
        !           376:                lp = pp->w_linep;
        !           377:                elp = pp->w_bufp->b_linep;
        !           378:                while (i > 0 && lback(lp)!=elp) {
        !           379:                        --i;
        !           380:                        lp = lback(lp);
        !           381:                }
        !           382:                pp->w_linep = lp;
        !           383:                pp->w_toprow = wp->w_toprow;
        !           384:        } else {                /* Not first window...  */
        !           385:                pp->w_wndp = wp->w_wndp;
        !           386:        }
        !           387:        if (wp == curwp) {
        !           388:                curwp = pp;
        !           389:                curbp = pp->w_bufp;
        !           390:        }
        !           391:        pp->w_ntrows += wp->w_ntrows + 1;
        !           392:        if (--wp->w_bufp->b_nwnd <= 0) {
        !           393:                register BUFFER *bp = wp->w_bufp;
        !           394:                bp->b_dotp  = wp->w_dotp;
        !           395:                bp->b_doto  = wp->w_doto;
        !           396:                bp->b_markp = wp->w_markp;
        !           397:                bp->b_marko = wp->w_marko;
        !           398:        }
        !           399:        free((char *) wp);
        !           400:        pp->w_flag  |= WFMODE|WFHARD;
        !           401:        return (TRUE);
        !           402: }
        !           403: 
        !           404: /*
        !           405:  * Zap the first window on the screen for the specified buffer using
        !           406:  * zappwind(), above.  Return FALSE if no window can be found associated
        !           407:  * with the buffer or if it was the only window.
        !           408:  */
        !           409: zapbwind(bp)
        !           410: register BUFFER *bp;
        !           411: {
        !           412:        register WINDOW *wp;
        !           413: 
        !           414:        if (bp->b_nwnd < 1)
        !           415:                return FALSE;
        !           416: 
        !           417:        wp = wheadp;
        !           418:        while (wp->w_bufp != bp) {
        !           419:                if ((wp = wp->w_wndp) == NULL) {
        !           420:                        return FALSE;
        !           421:                }
        !           422:        }
        !           423:        return zappwind(wp);
        !           424: }
        !           425: 
        !           426: /*
        !           427:  * This command deletes the current window from the screen unless it is
        !           428:  * the only window.  It uses zappwind(), above.
        !           429:  * Bound to "M-1".
        !           430:  */
        !           431: zapwind(f, n)
        !           432: {
        !           433:        return zappwind(curwp);
        !           434: }
        !           435: 
        !           436: #if    LIBHELP
        !           437: /*
        !           438:  * This command deletes the first window on the screen for the help buffer.
        !           439:  * Bound to "M-2".
        !           440:  */
        !           441: zaphelp(f, n)
        !           442: {
        !           443:        return zapbwind(helpbp);
        !           444: }
        !           445: #endif

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