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mothra: add keyboard command j to jump to page from the list of previously viewed pages

--- a/sys/man/1/mothra

+++ b/sys/man/1/mothra

@@ -1,6 +1,6 @@

 .TH MOTHRA 1

 .SH NAME

-mothra \- retrieve World-Wide Web files

+mothra \- retrieve and display World-Wide Web files

 .SH SYNOPSIS

 .B mothra

 [

@@ -50,6 +50,15 @@

 the environment variable

 .BR $url .

 .PP

+There are a number of options:

+.TP

+.B  -d

+Debug mode.

+.TP

+.B -v

+Verbose mode. Causes HTML errors to appear in

+.B $home/lib/mothra/mothra.err

+.PP

 Mothra uses

 .IR webfs (4)

 to retrive the url data. The mountpoint, default is

@@ -100,6 +109,11 @@

 .TP

 .BI g " url

 Get the page with the given URL.

+.TP

+.BI j " n

+Jump to page

+.I n

+from the list of previously viewed pages.

 .TP

 .B r

 Reload the current page.

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

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

@@ -3,6 +3,7 @@

  */

 #include <u.h>

 #include <libc.h>

+#include <ctype.h>

 #include <draw.h>

 #include <event.h>

 #include <keyboard.h>

@@ -538,6 +539,13 @@

 				message("no url selected");

 		}

 		else geturl(s, GET, 0, 1, 0);

+		break;

+	case 'j':

+		s=arg(s);

+		if(isdigit(s))

+			geturl(www(atoi(s)-1)->url->fullname, GET, 0, 0, 0);

+		else

+			message("no url selected");

 		break;

 	case 'r':

 		s = arg(s);

-- 

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