Dogbone notches are now optional and can be set in the gnuplot file.

- cameo/cameo.c (main): use getopt
- cameo/cameo.c (main, usage, process_path): option -d to enable dog-bone
  notches (they're now disabled by default)
- cameo/path.h (struct path), cameo/path.c (path_new, path_from): added
  attribute "notch" to enable notches for a path
- cameo/gnuplot.c (gnuplot_read, gnuplot_do_write): read and write the
  #%notch hint

cameo/cameo.c

@@ -13,11 +13,14 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #include "path.h"
 #include "gnuplot.h"
 
 
+static int dog_bone = 0;
+
 
 static void process_path(struct path *path, int inside)
 {
@@ -26,9 +29,9 @@ static void process_path(struct path *path, int inside)
 
 	left = path_tool_is_left(path);
 	if (inside)
-		new = path_offset(path, !left, 0);
+		new = path_offset(path, !left, path->notch);
 	else
-		new = path_offset(path, left, 1);
+		new = path_offset(path, left, path->notch || dog_bone);
 	path_replace(path, new);
 }
 
@@ -61,8 +64,10 @@ static void process_paths(struct path *paths)
 
 static void usage(const char *name)
 {
-	fprintf(stderr, "usage: %s r_mm [in.gnuplot [out.gnuplot]]\n",
-	    name);
+	fprintf(stderr,
+"usage: %s [-d] r_mm [in.gnuplot [out.gnuplot]]\n\n"
+"  -d  put a dog-bone notch in each concave external corner\n"
+    , name);
 	exit(1);
 }
 
@@ -72,16 +77,26 @@ int main(int argc, char **argv)
 	char *in = NULL, *out = NULL;
 	double r;
 	struct path *paths;
+	int c;
 
-	switch (argc) {
-	case 4:
-		out = argv[3];
-		/* fall through */
+	while ((c = getopt(argc, argv, "d")) != EOF)
+		switch (c) {
+		case 'd':
+			dog_bone = 1;
+			break;
+		default:
+			usage(*argv);
+		}
+
+	switch (argc-optind) {
 	case 3:
-		in = argv[2];
+		out = argv[optind+2];
 		/* fall through */
 	case 2:
-		r = atof(argv[1]);
+		in = argv[optind+1];
+		/* fall through */
+	case 1:
+		r = atof(argv[optind]);
 		break;
 	default:
 		usage(*argv);