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mothra: add -a flag to start in alt-display mode

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -158,7 +158,8 @@

 }

 void mkpanels(void){

-	Panel *p, *bar;

+	Panel *p, *bar, *swap;

+

 	menu3=plmenu(0, 0, buttons, PACKN|FILLX, hit3);

 	root=plpopup(root, EXPAND, 0, 0, menu3);

 		p=plgroup(root, PACKN|FILLX);

@@ -183,6 +184,15 @@

 		bar=plscrollbar(alt, PACKW|USERFL);

 		alttext=pltextview(alt, PACKE|EXPAND, Pt(0, 0), 0, dolink);

 		plscroll(alttext, 0, bar);

+

+	if(!defdisplay){

+		swap=root;

+		root=alt;

+		alt=swap;

+		swap=text;

+		text=alttext;

+		alttext=swap;

+	}

 }

 int cohort = -1;

 void killcohort(void){

@@ -265,6 +275,7 @@

 	case 'm':

 		if(mtpt = ARGF())

 			break;

+	case 'a': defdisplay=0; break;

 	default:  goto Usage;

 	}ARGEND

@@ -284,7 +295,7 @@

 	switch(argc){

 	default:

 	Usage:

-		fprint(2, "Usage: %s [-dv] [-m mtpt] [url]\n", argv0);

+		fprint(2, "Usage: %s [-dva] [-m mtpt] [url]\n", argv[0]);

 		exits("usage");

 	case 0:

 		url=getenv("url");