add basic logging and CLI options

7 files changed, 150 insertions, 11 deletions

diff --git a/.gitignore b/.gitignore
index 5b38b15..78bcb70 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *.o
 experimental/tectonics/tests
 experimental/tectonics/tectonics
+*.png
diff --git a/experimental/tectonics/Makefile b/experimental/tectonics/Makefile
index ab8fb0d..a0245f3 100644
--- a/experimental/tectonics/Makefile
+++ b/experimental/tectonics/Makefile
@@ -5,8 +5,8 @@ DEPS=tectonics.h
 %.o: %.c $(DEPS)
 	$(CC) -c -o $@ $< $(CFLAGS)
 
-all: world.o util.o tectonics.o quadtree.o drawing.o
-		$(CC) -o tectonics world.o util.o tectonics.o quadtree.o drawing.o $(CFLAGS)
+all: world.o util.o tectonics.o quadtree.o drawing.o logging.o
+		$(CC) -o tectonics world.o util.o tectonics.o logging.o quadtree.o drawing.o $(CFLAGS)
 
 test: all quadtree.o quadtree.test.o tests.o
 		$(CC) -o tests world.o util.o quadtree.o quadtree.test.o tests.o $(CFLAGS)
diff --git a/experimental/tectonics/geometry.h b/experimental/tectonics/geometry.h
index de01042..fdad15a 100644
--- a/experimental/tectonics/geometry.h
+++ b/experimental/tectonics/geometry.h
@@ -9,6 +9,13 @@ struct point_t {
 };
 
 
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * quadtree
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
 struct quad_region_t {
    struct point_t center;
    double half_dim;
@@ -25,13 +32,6 @@ struct quadtree_node_t {
 };
 
 
-/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * quadtree
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
-
 /* check if a region contains a point */
 bool quad_contains_point(struct quad_region_t region,
 			 struct point_t pt);
@@ -65,4 +65,24 @@ int quadtree_get_closest(struct quadtree_node_t *root,
  */
 void quadtree_free(struct quadtree_node_t *root);
 
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * mesh
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+struct triangle_t {
+   struct point_t p1, p2, p3;
+};
+
+struct triangle_array_t {
+   int n_triangles;
+   struct triangle_t *triangles;
+};
+
+
+
+
 #endif
diff --git a/experimental/tectonics/logging.c b/experimental/tectonics/logging.c
new file mode 100644
index 0000000..ec416d6
--- /dev/null
+++ b/experimental/tectonics/logging.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "logging.h"
+
+int global_log_level;
+
+const char *level_string(int level)
+{
+   switch(level) {
+   case FATAL:
+      return "FATAL";
+   case ERROR:
+      return "ERROR";
+   case WARN:
+      return "WARN";
+   case INFO:
+      return "INFO";
+   case DEBUG:
+      return "DEBUG";
+   case TRACE:
+      return "TRACE";
+
+   default:
+      if (level > TRACE)
+	 return "TRACE";
+      return "[BAD LOG LEVEL]";
+   }
+}
+
+
+void log_msg(int level, const char *format_string, ...)
+{
+   if (global_log_level >= level) {
+      va_list args;
+      va_start(args, format_string);
+      fprintf(stderr, "[%s] ", level_string(level));
+      vfprintf(stderr, format_string, args);
+      fprintf(stderr, "\n");
+      va_end(args);
+   }
+}
diff --git a/experimental/tectonics/logging.h b/experimental/tectonics/logging.h
new file mode 100644
index 0000000..47e09e7
--- /dev/null
+++ b/experimental/tectonics/logging.h
@@ -0,0 +1,16 @@
+#ifndef ARGENT_LOGGING_H
+#define ARGENT_LOGGING_H
+
+#define FATAL 0
+#define ERROR 1
+#define WARN 2
+#define INFO 3
+#define DEBUG 4
+#define TRACE 5
+
+extern int global_log_level;
+
+const char *level_string(int level);
+void log_msg(int level, const char *format_string, ...);
+
+#endif
diff --git a/experimental/tectonics/tectonics.c b/experimental/tectonics/tectonics.c
index 7d5342a..0a81b45 100644
--- a/experimental/tectonics/tectonics.c
+++ b/experimental/tectonics/tectonics.c
@@ -2,12 +2,21 @@
 
 #include "tectonics.h"
 #include "drawing.h"
+#include "logging.h"
 
 #define X_RES 1024
 #define Y_RES X_RES
 
-int main()
+
+int parse_options(char **output_file, int argc, char **argv);
+   
+
+int main(int argc, char **argv)
 {
+   char *output_file;
+   if (parse_options(&output_file, argc, argv))
+      return 1;
+   
    cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, X_RES, Y_RES);
    cairo_t *cr = cairo_create(surface);
 
@@ -23,3 +32,53 @@ int main()
    cairo_surface_destroy(surface);
    return 0;
 }
+
+
+#include <stdio.h>
+#include <unistd.h>
+
+static void print_usage(const char *progname)
+{
+   printf("Usage: %s [-c config_file] [-v[v[v]]] [-q[q[q]]] [-h] [-s script]\n"
+	  "  -v    Increase output verbosity (-vvv displays every log message)\n"
+	  "  -q    Decrease output verbosity (-qqq suppresses even fatal errors)\n"
+	  "  -c    Specify configuration file to read (default 'config.lua')\n"
+	  "  -s    Override the built-in Lua script\n"
+	  "  -h    Print this help message and exit\n",
+	  progname);	  
+}
+
+int parse_options(char **output_file, int argc, char **argv)
+{
+   int log_level = WARN;
+   *output_file = "output.png";
+   
+   int opt;
+   while ((opt = getopt(argc, argv, "qvo:h")) != -1) {
+      switch (opt) {
+      case 'q':
+	 log_level -= 1;
+	 break;
+	 
+      case 'v':
+	 log_level += 1;
+	 break;
+	 
+      case 'o':
+	 *output_file = optarg;
+
+      case 'h':
+	 print_usage(argv[0]);
+	 return 2;
+
+      default:
+	 print_usage(argv[0]);
+	 return 1;
+      }
+   }
+
+   // ew, globals (sorry)
+   global_log_level = log_level;
+
+   return 0;
+}
diff --git a/experimental/tectonics/world.c b/experimental/tectonics/world.c
index 5aa485c..f5b6efb 100644
--- a/experimental/tectonics/world.c
+++ b/experimental/tectonics/world.c
@@ -4,6 +4,7 @@
 #include "tectonics.h"
 #include "geometry.h"
 #include "util.h"
+#include "logging.h"
 
 static void rebuild_tree(struct world_t *world)
 {
@@ -114,7 +115,7 @@ void create_world(struct world_t *world, int n_points)
 
    rebuild_tree(world);
 
-   for (int i=0; i<3; i++)
+   for (int i=0; i<15; i++)
       relax_points(world, 10*world->n_points);
 }