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patch: support no-newline directives

When we get a patch with a:

  \ No newline at end of file

directive, we now apply it correctly,
removing the newline. We generalize
a bit, allowing any line to trim a
newline, giving a primitive form of
line splitting

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

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

@@ -265,10 +265,23 @@

 	*b = t;

 }

+void

+trimhunk(char c, Hunk *h)

+{

+	if((c == ' ' || c == '-') && h->oldlen > 0 && h->old[h->oldlen-1] == '\n'){

+		h->oldcnt--;

+		h->oldlen--;

+	}

+	if((c == ' ' || c == '+') && h->newlen > 0 && h->new[h->newlen-1] == '\n'){

+		h->newcnt--;

+		h->newlen--;

+	}

+}

+

 Patch*

 parse(Biobuf *f, char *name)

 {

-	char *ln, *old, *new;

+	char *ln, *old, *new, c;

 	int i, oldcnt, newcnt, lnum;

 	Patch *p;

 	Hunk h, *ph;

@@ -316,10 +329,16 @@

 			addhunk(p, &h);

 			break;

 		}

+		c = ln[0];

 		switch(ln[0]){

 		default:

 			sysfatal("%s:%d: malformed hunk: leading junk", name, lnum);

 			goto out;

+		case '\\':

+			if(strncmp(ln, "\\ No newline", nelem("\\ No newline")-1) == 0)

+				trimhunk(c, &h);

+			/* ignore unknown directives */

+			break;

 		case '-':

 			addold(&h, ln);

 			oldcnt++;

@@ -350,6 +369,8 @@

 		addhunk(p, &h);

 		if((ln = readline(f, &lnum)) == nil)

 			goto out;

+		if(strncmp(ln, "\\ No newline", nelem("\\ No newline")-1) == 0)

+			trimhunk(c, &p->hunk[p->nhunk-1]);

 		if(strncmp(ln, "--- ", 4) == 0)

 			goto patch;

 		if(strncmp(ln, "@@ ", 3) == 0)

@@ -542,6 +563,7 @@

 searchln(Fbuf *f, Hunk *h, int ln)

 {

 	int off;

+int n;

 	off = f->lines[ln];

 	if(off + h->oldlen > f->len)