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vdiff: fix scrolling and clean up

* accept list of patches from argv
* fix issue where menu would take precedence over scrolling
* fix issues when collapsing and expanding would scroll awkwardly

--- a/sys/man/1/vdiff

+++ b/sys/man/1/vdiff

@@ -11,12 +11,12 @@

 .I nstrip

 ]

 [

-.I file

+.I patches...

 ]

 .SH DESCRIPTION

-.I vdiff

-reads unified diff output from

-.I file

+.I Vdiff

+reads unified diff output from the list of

+.I patches

 or standard input and displays a colored version.

 Each file within the diff is displayed in a separate block that can be collapsed by clicking on the file name.

 Right clicking on a line will send a

@@ -34,6 +34,9 @@

 A menu may be summoned with button 2 of the mouse.

 It provides menu items for collapsing and expanding all files,

 as well as items for each patch present in the input.

+.I Vdiff

+understands terminators supplied by

+.IR git/export (2).

 .PP

 The

 .B -b

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

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

@@ -245,12 +245,16 @@

 }

 void

-clampoffset(void)

+clampoffset(int off)

 {

 	if(offset<0)

 		offset = 0;

-	if(offset+viewh>totalh)

-		offset = totalh - viewh;

+	if(offset+viewh>totalh){

+		if(off > 0)

+			offset = totalh - viewh;

+		else

+			offset = 0;

+	}

 }

 void

@@ -261,7 +265,7 @@

 	if(off>0 && offset+viewh>totalh)

 		return;

 	offset += off;

-	clampoffset();

+	clampoffset(off);

 	redraw();

 }

@@ -312,8 +316,10 @@

 	}

 	totalh = totalh - Margin + Vpadding;

 	scrollsize = viewh / 2.0;

-	if(offset > 0 && offset+viewh>totalh)

-		offset = totalh - viewh;

+	if(viewh <= totalh)

+		clampoffset(1);

+	else

+		clampoffset(0);

 	redraw();

 }

@@ -362,7 +368,7 @@

 		return "expand";

 	default:

 		i -= Nmenu;

-		if(i >= npatches)

+		if(i >= npatches || npatches == 1)

 			return nil;

 		if(patches[i].name == nil)

 			patches[i].name = smprint("%d", i);

@@ -387,7 +393,23 @@

 	}

 }

+Menu menu = {

+	nil,

+	genmenu,

+};

+

 void

+collapse(int v)

+{

+	int i;

+

+	for(i = 0; i < cur->nblocks; i++)

+		if(cur->blocks[i]->f != nil)

+			cur->blocks[i]->v = v;

+	eresize(0);

+}

+

+void

 emouse(Mouse m)

 {

 	Block *b;

@@ -406,12 +428,30 @@

 		}else if(m.buttons&2){

 			offset = (m.xy.y - scrollr.min.y) * totalh/Dy(scrollr);

 			offset = offset/lineh * lineh;

-			clampoffset();

+			if(viewh <= totalh)

+				clampoffset(1);

+			else

+				clampoffset(0);

 			redraw();

 		}else if(m.buttons&4){

 			scroll(n);

 			return;

 		}

+	}else if(!scrolling && m.buttons&2){

+		n = menuhit(2, mctl, &menu, nil);

+		switch(n){

+		case -1:

+			break;

+		case Mexpand: case Mcollapse:

+			collapse(n);

+			break;

+		default:

+			n -= Nmenu;

+			if(cur == patches+n)

+				break;

+			cur = patches+n;

+			eresize(0);

+		}

 	}else if(m.buttons&8){

 		scroll(-n);

 	}else if(m.buttons&16){

@@ -564,19 +604,8 @@

 }

 void

-collapse(int v)

+parse(int fd, char *name)

 {

-	int i;

-

-	for(i = 0; i < cur->nblocks; i++)

-		if(cur->blocks[i]->f != nil)

-			cur->blocks[i]->v = v;

-	eresize(0);

-}

-

-void

-parse(int fd)

-{

 	Biobuf *bp;

 	Block *b;

 	char *s, *f, *tab;

@@ -605,7 +634,7 @@

 			cur = patches+npatches-1;

 			cur->blocks = nil;

 			cur->nblocks = 0;

-			cur->name = nil;

+			cur->name = name;

 			b = addblock();

 			n = 0;

 			ab = 0;		

@@ -640,8 +669,10 @@

 			if(f != nil && (f = strchr(f+1, ' '))){

 				f++;

 				if(strcmp(f, "uncommitted") != 0){

-					cur->name = strdup(f);

-					cur->name[9] = '\0';

+					if(name != nil)

+						cur->name = smprint("%s %.*s", name, 9, f);

+					else

+						cur->name = smprint("%.*s", 9, f);

 				}

 			}

 			t = Lnone;

@@ -659,13 +690,13 @@

 	}

 	if(gotterm)

 		npatches--;

-	cur = patches;

+	Bterm(bp);

 }

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-b] [-p nstrip] [file]\n", argv0);

+	fprint(2, "usage: %s [-b] [-p nstrip] [patches...]\n", argv0);

 	exits("usage");

 }

@@ -681,11 +712,7 @@

 		{ nil, &k,  CHANRCV },

 		{ nil, nil, CHANEND },

 	};

-	Menu menu = {

-		nil,

-		genmenu,

-	};

-	int b, n;

+	int i, b, fd;

 	b = 0;

 	ARGBEGIN{

@@ -699,17 +726,16 @@

 		usage();

 		break;

 	}ARGEND;

-	switch(argc){

-	default:

-		usage();

-	case 1:

-		close(0);

-		if(open(argv[0], OREAD) < 0)

+	if(argc == 0)

+		parse(0, nil);

+	else for(i = 0; i < argc; i++){

+		fd = open(argv[i], OREAD);

+		if(fd < 0)

 			sysfatal("open: %r");

-	case 0:

-		break;

+		parse(fd, argv[i]);

+		close(fd);

 	}

-	parse(0);

+	cur = patches;

 	if(cur->nblocks==1 && cur->blocks[0]->nlines==0){

 		fprint(2, "no diff\n");

 		exits(nil);

@@ -731,23 +757,7 @@

 	for(;;){

 		switch(alt(a)){

 		case Emouse:

-			if((m.buttons&2) != 0){

-				n = menuhit(2, mctl, &menu, nil);

-				switch(n){

-				case -1:

-					break;

-				case Mexpand: case Mcollapse:

-					collapse(n);

-					break;

-				default:

-					n -= Nmenu;

-					if(cur == patches+n)

-						break;

-					cur = patches+n;

-					eresize(0);

-				}

-			} else

-				emouse(m);

+			emouse(m);

 			break;

 		case Eresize:

 			eresize(1);

-- 

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