I sometimes find myself on either slow or data-capped network links where downloading images isn't ideal. Attached is a simple patch to mothra that changes the 'k' command to not only remove already-downloaded images from a page, but also toggle a state such that mothra won't attempt to download images on future visited sites until 'k' is toggled again. This also adds a '-k' flag to mothra which enables the flag at startup.
diff -r 65adb71807cf sys/man/1/mothra --- a/sys/man/1/mothra Fri Jun 22 14:49:18 2018 +0200 +++ b/sys/man/1/mothra Sat Jun 23 09:56:12 2018 -0400 @@ -56,6 +56,8 @@ Alt display. Starts in alt display mode, see menu commands table below. .TP +.B -k +Kill images. Don't fetch/display images. .B -m Specify the .IR webfs (4) @@ -132,7 +134,7 @@ from the list of previously viewed pages. .TP .BI k -Kill images on the current page. +Toggle killing of images. .TP .BI m Enter or exit moth mode. diff -r 65adb71807cf sys/src/cmd/mothra/mothra.c --- a/sys/src/cmd/mothra/mothra.c Fri Jun 22 14:49:18 2018 +0200 +++ b/sys/src/cmd/mothra/mothra.c Sat Jun 23 09:56:12 2018 -0400 @@ -14,6 +14,7 @@ #include "rtext.h" int debug=0; int verbose=0; /* -v flag causes html errors to be written to file-descriptor 2 */ +int killimgs=0; /* should mothra kill images? */ int defdisplay=1; /* is the default (initial) display visible? */ int visxbar=0; /* horizontal scrollbar visible? */ int topxbar=0; /* horizontal scrollbar at top? */ @@ -306,6 +307,7 @@ ARGBEGIN{ case 'd': debug=1; break; case 'v': verbose=1; break; + case 'k': killimgs=1; break; case 'm': if(mtpt = ARGF()) break; @@ -329,7 +331,7 @@ switch(argc){ default: Usage: - fprint(2, "Usage: %s [-dva] [-m mtpt] [url]\n", argv0); + fprint(2, "Usage: %s [-dvak] [-m mtpt] [url]\n", argv0); exits("usage"); case 0: url=getenv("url"); @@ -687,7 +689,9 @@ mothon(current, !mothmode); break; case 'k': - killpix(current); + killimgs = !killimgs; + if (killimgs) + killpix(current); break; case 'w': case 'W': @@ -837,7 +841,7 @@ break; case 0: if(type==HTML) - plrdhtml(w->url->fullname, fd, w); + plrdhtml(w->url->fullname, fd, w, killimgs); else plrdplain(w->url->fullname, fd, w); _exits(0); diff -r 65adb71807cf sys/src/cmd/mothra/mothra.h --- a/sys/src/cmd/mothra/mothra.h Fri Jun 22 14:49:18 2018 +0200 +++ b/sys/src/cmd/mothra/mothra.h Sat Jun 23 09:56:12 2018 -0400 @@ -78,7 +78,7 @@ }; void finish(Www *w); -void plrdhtml(char *, int, Www *); +void plrdhtml(char *, int, Www *, int); void plrdplain(char *, int, Www *); void htmlerror(char *, int, char *, ...); /* user-supplied routine */ void seturl(Url *, char *, char *); diff -r 65adb71807cf sys/src/cmd/mothra/rdhtml.c --- a/sys/src/cmd/mothra/rdhtml.c Fri Jun 22 14:49:18 2018 +0200 +++ b/sys/src/cmd/mothra/rdhtml.c Sat Jun 23 09:56:12 2018 -0400 @@ -704,7 +704,7 @@ plaintext(&g); finish(dst); } -void plrdhtml(char *name, int fd, Www *dst){ +void plrdhtml(char *name, int fd, Www *dst, int killimgs){ int tagerr; Stack *sp; char buf[20]; @@ -1222,7 +1222,8 @@ } pl_popstate(g.state); *g.tp='\0'; - getpix(dst->text, dst); + if (!killimgs) + getpix(dst->text, dst); finish(dst); return; }